superconductors and PMN-PT ferroelectric relaxation in the transport phenomena

　　Title: Y_ (1-x) Ho_xNi_2B_2C superconductors and PMN-PT ferroelectric relaxation in the transport phenomena
　　Author: Zhao Songrui
　　Degree-granting units: Zhejiang University
　　Key words: nickel-boron rare-earth carbon superconductor;; multi-band superconductivity;; magnetic split on;; relaxation ferroelectric;; oxygen vacancies;; resistance degradation
　　Abstract:
　　Transport phenomena in solids is an extremely important physical phenomenon. Study the transport properties of superconductors, can better understand
　　Its superconducting properties. Neodymium Magnets Associated with the electronic transport behavior corresponding to the solid can be generated in the ion transport behavior, this ion output
　　Transport is considered in the resistance of titanate degradation. It is based on these motivations, this paper studied the superconductor Y1-xHoxNi2B2C
　　Transport properties and Pb (Mg1/3Nb2/3) O3-0.3PbTiO3 (PMN-0.3PT) relaxation in the ferroelectric material transport phenomena. The paper work
　　Both for basic science research in the field or the materials applied research in the field has a profound significance: the first time we measured
　　YNi2B2C Nernst effect, the first transport with a very sensitive measurement technique to prove the system's multi-band characteristics. Subsequently, we
　　Ho-doped by magnetic atoms, discovered and explained a new related superconducting and magnetic Wuxu - normal state re-entry behavior, which is the body magnetic Wuxu
　　Department of superconducting - normal state re-entry behavior was first reported. Finally, the paper also fill the relaxation resistance of ferroelectric http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets materials degradation mechanisms in
　　Research, for industrial high-performance ferroelectric materials design and application of profound significance.
　　The paper is divided into two parts.
　　The first paper examined some of the major nickel-boron rare-earth superconductor Y1-xHoxNi2B2C carbon transport properties and magnetic properties. For the parent compound
　　Material superconductors YNi2B2C, measured by the Nernst effect, etc., found in the normal state Nernst signal is increased, strong evidence of the
　　System of multi-band superconductivity, which is the Nernst effect in superconductors, the first report. We also found that the Nernst effect has been on the
　　Critical magnetic field Hc2 (T) magnetoresistance measured with basically the same, indicating that the superconducting phase fluctuation is not, and the high-temperature copper oxide superconductors
　　There is a clear difference. Subsequently, we systematically studied the Ho-doped superconducting system Y1-xHoxNi2B2C characteristics and magnetic properties. Found
　　With increasing concentration of Ho atoms, YNi2B2C superconducting temperature was significantly inhibited on this result, we first demonstrated in detail
　　The superconducting transition temperature of the suppression comes mainly from the demolition of the magnetic effect, and Ho ions replace Y-induced changes in the quality (similar to the isotope effect)
　　Suppression of the superconducting transition temperature has little effect. In addition, we studied in detail YNi2B2C first critical field on doping with the concentration of magnetic Ho
　　Degree of evolutionary behavior, that is, for the Ho doping concentration less than 0.5, the critical field of superconducting properties with a multi-band, and when the Ho concentration is higher than 0.5,
　　Relationship between the critical field on temperature is mainly affected by the impact of magnetic Ho ions, which once again shows that the magnetic system in a strong split of the effect. Finally,
　　Ho concentration of 0.75 samples, we studied in detail the nature of its superconductivity and magnetism, and found a new re-entry behavior. And HoNi2B2C
　　The difference is that this re-entry re-entry in the resistance behavior of the peak position with temperature, magnetic field changes, and the upper critical field
　　Temperature minimum value does not exist. Through a detailed study of its magnetic structure, we believe that the presence of non-magnetic Y atoms leads to Ho ions
　　Magnetic disorder, and this magnetic disorder on the behavior of the peak re-entry plays a major role.
　　The second part, we discuss in detail
　　Behavior of another and ion transport-related phenomena, namely Pb (Mg1/3Nb2/3) 03-0.3PbTiO3 (PMN-0.3PT) relaxation in ferroelectric materials
　　Transport behavior of oxygen vacancies. Transport of oxygen vacancies, often lead to resistance in the perovskite oxide degradation behavior. This line of resistance degradation
　　As, in the alkaline earth metal titanates has been well studied, and for the study of lead titanate based almost no, this part of the work,
　　It is to fill this gap. We Highly Accelerated Lifetime Tests (HALTs), Thermally
　　Stimulated Depolarization Current (TSDC) and Impedance Spectroscopy (IS) and other measurement techniques, have
　　A relaxation of the lead-based ferroelectric materials, resistance degradation model, and calculate the resistance degradation processes control the transport of oxygen vacancies and the excitation energy
　　Voltage acceleration factor, these two parameters for the industrial design of high-performance lead-based piezoelectric materials have a very deep meaning.
　　Degree Year: 2009

Magnetic coupling and the vacuum robot shaft theoretical modeling and experimental research

　　Title: Magnetic coupling and the vacuum robot shaft theoretical modeling and experimental research
　　Author: Wang Yu Lin
　　Degree-granting units: Shanghai Jiao Tong University
　　Keywords: vacuum robot;; magnetic coupling;; direct drive;; equivalent magnetic charge method;; chip current law;; simulation optimization
　　Abstract:
　　Robot vacuum before said semiconductor devices of the cluster-type reaction process chamber to transfer wafers core components, attributable to
　　Embargo products, China has restricted the manufacturing of semiconductor equipment, machine, "Kabo Zi" problem. Atmospheric and vacuum neodymium magnets density between
　　Sealing isolation and power constraints of the vacuum transfer robot is to improve the technical performance bottleneck. Therefore, the vacuum robot breakthroughs in key technologies and
　　The innovative design of the prototype system, with independent intellectual property rights for the realization of the whole semiconductor device core components has important theoretical significance and
　　Practical value. This paper to the inside and outside the axis of magnetic coupling modeling and analysis and optimization as the main target, combined with magnetic drive technology and
　　Direct drive technology, design the layout of the vacuum coaxial two degrees of freedom robot prototype power transmission shaft.
　　In this paper, were built
　　Inside and outside the established theoretical model of magnetic coupling axis and three-dimensional finite element model. Improved equivalent magnetic charge method and the magnetic pieces together to solve current method
　　Transfer torque coupling mathematical model, the introduction of magnetic flux leakage loss coefficient, were obtained by two methods based on internal and external axial gap type magnetic coupling
　　The maximum torque of simplified formula to expand the scope of the model, significantly improves both accuracy and efficiency of the solution method. Among them,
　　Film on the current method improves the solution accuracy of 25% -30%, equivalent magnetic charge method to improve the accuracy of 4% -30% http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php more efficient solution than doubled.
　　Current law through the use of film, equivalent magnetic charge method and the finite element model, a comprehensive analysis of the magnetic coupling geometry with the maximum torque
　　, Maximum torque volume, and start the torsional stiffness of the relationship. And use the three-dimensional finite element method, respectively, the magnetic effect of the yoke, multi-group
　　Magnetic coupling between the magnetic coupling effect, and four different configurations of internal and external axis magnetic coupling of the simulation analysis. The results are
　　Applied to optimize the design of magnetic coupling
　　Based on magnetic coupling in the practical application of a vacuum when the robot shaft coupling conditions,
　　To simultaneously optimize two magnetic coupling, for example, the establishment of a magnetic coupling design geometry optimization objective function. Put forward innovative
　　An orthogonal experimental design techniques to optimize the design of small-scale exhaustive program, look at the overall design parameters, combined with the analytical method
　　Operational efficiency and accuracy of three-dimensional finite element method the advantages of high, using orthogonal experimental method and small-scale exhaustive method significantly reduces the analysis
　　Model number, is an efficient and practical, stable and reliable optimization method. In this case, the final optimized parameter set available table than the orthogonal
　　Optimal parameter set relative index value increased by about 30%, optimize the design of the target consistent with the results.
　　With two self-developed
　　Coaxial distribution from the degree of vacuum robot prototype power transmission shaft. Combined with vacuum robot development, innovation in the isolated gland
　　Designed for step-hollow thin-walled container structures, and isolated sets of intensity and radial deformation of the check, put the eddy current loss of isolation
　　Loss for the research and analysis. In addition, we propose a vacuum robot for magnetic coupling design, direct drive for split
　　Motor shaft of the study design, research and development of next-generation vacuum robot has important reference value.
　　Finally, can be developed
　　Magnetic coupling between the rotor outside the test deviation of the experimental platform for the axial deviation, radial deviation, and angular deviation of the external axis
　　Magnetic couplings transmit torque and dynamic performance tests. The results show that, in practical applications, inside and outside the axis of the magnetic deviation
　　Torque transfer coupling and dynamic tracking features have little effect. Experiment, the magnetic coupling of the dynamic tracking performance is good, and start-up phase
　　, The response time of less than 0.0ls; when the peak speed of 670deg / s, acceleration 1260deg/s2, the settling time tS of 0.35s, a variety of
　　The maximum deviation of tracking error δ are 20 'or so, the steady-state error ess in the 2' or so. In addition, the positioning accuracy and re-shafting
　　Re-positioning accuracy and dynamic response characteristics of the test results show that it has a good tracking performance, steady-state error ess in the 3 'left
　　Right, each group of magnetic coupling between the magnetic coupling effect is very small.
　　Degree Year: 2009

GaN-based diluted magnetic semiconductors, theory and experiment

Title: GaN-based diluted magnetic semiconductors, theory and experiment Author: Xu Daqing Degree-granting units: Xi'an University of Electronic Science and Technology Keywords: diluted magnetic semiconductor;; GaN;; ion implantation;; microstructure;; ferromagnetic Abstract: Diluted magnetic semiconductor (Dilute Magnetic Semiconductors, DMSs) as a good backup of spintronics
Materials, spintronics quickly become a neodymium magnets hot research materials. It has a semiconductor band structure, but also with the substrate lattice constant
Semiconductor similar, not only in the manufacture of the device can be a good time and compatible with existing semiconductor technology, and both magnetic properties.
However, DMSs study by the Curie temperature and low magnetic dopant solubility and other problems. 2000, Dietl and his co-
Zener model were based on theoretical prediction of GaN-based dilute magnetic semiconductors can reach the Curie temperature Tc above room temperature. The theoretical predictions
GaN-based raises the concern of diluted magnetic semiconductors. GaN-based diluted magnetic semiconductors can be used diffusion method, molecular beam epitaxy (MBE)
, Metal organic chemical vapor deposition (MOCVD) and preparation methods such as ion implantation. As the use of diffusion of the magnetic metals mixed
GaN is still limited by the solubility and requires a higher temperature and longer time, so I do not have practical value. As for the MBE and
MOCVD, how to solve the problem of doping solubility of magnetic elements has been a problem. As the ion implantation itself, the technical features and no solid
Solubility limits, etc., so prepare ion http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php implantation is an effective means of DMSs. Prepared using ion implantation of GaN-based DMSs,
Although there have been reported, but the vast majority of the samples only the magnetic properties of a simple report, and are based on the basic theory
Prediction of Mn-doped P-type GaN research, and unintentional doping of Mn ions into GaN is very little research, especially with material microstructure
Changes in characteristics of the structure of the magnetic properties of the sample analysis is still a subject to be studied in depth. In this context, the
Text-based first-principles density functional theory plane-wave pseudopotential method for Mn-doped GaN electronic structure and optical properties of the
Calculation and analysis, preparation of Mn ions into GaN-based micro-structure diluted magnetic semiconductor, optical, magnetic and electrical properties of the measuring system
Pilot study, the main results obtained are as follows: (1) First, based on first-principles density functional theory plane-wave pseudopotential method
Mn-doped GaN on the energy band structure, electron density of states and optical properties were calculated after analysis of the doping-related changes in the nature. Calculate
That, Mn doping as Mn3d and N2p orbital hybridization, resulting in spin-polarized impurity Dai, semi-metallic materials behave, if the impurity band
Carriers have sufficient mobility, from GaMnN can produce high polarization rate of spin-polarized carrier injection. In addition, Mn ion incorporation
Near the Fermi level provides a large number of carriers, changing the electronic transitions between the band, the dielectric function of GaN impact. Calculator
Ming, Mn-doped GaN, due to the Mn-doped with different impurities produced by the in-band transitions between states, optical absorption spectra in the emergence of new peaks
. The results also show that GaMnN electronic structure is more suitable for spin-polarized charge transfer, spin injection is a suitable source.
(2) Monte Carlo method, simulation software with Trim Mn ions of different energies of GaN into the average range, standard deviation and concentration
Degree distribution for the statistical calculations, simulated under different energy Mn ion implantation into GaN in the concentration distribution; design of Mn ion implantation
Into the preparation of GaN-based diluted magnetic semiconductor injection process parameters (energy and implantation dose) and annealing conditions. (3) of Mn from
GaN micro-injected into the sub-structure and optical properties. First, ion implantation of Mn-doped GaN micro unintentional structural and optical properties are studied
. With the XRD and found a alternative Ga and Mn atoms or Ga-Mn and Mn-N compounds with related characteristics. Using micro-Raman spectra of isolated
Child before and after annealing the sample before and after injection of micro-structural changes were studied, in addition to the peaks observed in GaN, the samples also appeared
Some new phonon modes and the peaks E 2high showing the shoulders on both sides of the peak effect. Analysis of emerging phonon modes are
Associated with the disorder activated Raman scattering (DARS), Ga, N vacancy-related defects in the vibrational modes and by Gax-Mny-related local vibration
(LVM) due. Lorentz transform-based sub-peak fitting method and about the quality of model-based analysis that E 2high shoulder peaks around
By the local structure associated with MnxNy local vibration (LVM) and (Ga, Mn) N LVM of Mn ions caused. Using photoluminescence
(PL spectrum) of the sample's optical properties are studied, tests showed there were two PL spectra associated with ion implantation at 2.53eV and
2.92eV luminescence peak of the new analysis that the emission band located at 2.92eV from the conduction band or the shallow donor level to the main level of the transition by
Compound produced by the radiation, and this may be by the main level with VGa related complex, the complex is located about energy gap energy level price
More than 0.4eV with the top position. For the green emission peak at 2.53eV, that is a shallow donor to the compound by the main transition radiation produced
Students. Of Mn ions into the Mg-doped GaN sample microstructure and optical properties. Test results and Raman spectra of unintentionally doped
Sample test results are basically the same. PL spectra showed that at 2.54eV and 2.9eV in addition to these two peaks, at 1.69eV
There is another new emission peak. Combined with the characteristics of Mg-doped GaN by PL spectra of the sample and 2.54eV 2.9eV peak intensity ratio of peaks
Analysis of changes with annealing temperature, that the emission peak at 2.9eV is MgGa-VN complexes (Dd) and Mg shallow acceptor formation of deep-Shi
Main - shallow acceptor related to the transition between the radiative recombination, and thus analysis of the emission peak at 1.69eV could be re-based MgGa-VN
Fit deep donor levels (Dd) and VGa complex related by the primary level (Ad) between the radiative recombination. (4) the ion
Into the GaN surface due to injury and different annealing temperatures damage repair. With the AFM result of ion implantation and surface damage of GaN
Annealing repair were analyzed, indicating that the GaN surface due to thermal decomposition at high temperatures, limiting the heat through the use of higher annealing temperature on the sample
Materials for effective repair. Research also shows that the use of heat to reduce the target into the ion implantation damage is an effective way. By
Raman spectra of A1 (LO) and E 2high peak shape and peak width at half maximum of the study evolution with annealing temperature, that the lattice damage caused by ion implantation
Wound repair can be divided into three stages: when the annealing temperature is not higher than 800 ℃, the ion implantation the sample began to recrystallization by ion implantation
The lattice damage caused by the beginning have been restored, with the annealing temperature gradually increased from 800 ℃ to 900 ℃, the lattice damage repair further
And ion implantation induced defects also gradually reduced. When the annealing temperature to 900 ℃ for more than, GaN epitaxial layer on the surface begins to decompose
. Repair and ferromagnetic properties from the lattice both at the same time consider that the best sample after ion implantation rapid thermal annealing temperature should be controlled
System at between 800 ℃ to 900 ℃. (5) of Mn ions into the unintentionally doped GaN samples of magnetic and electrical properties. Do not
Samples with annealing temperature and the magnetization hysteresis loop characteristics of the test show that after 800 ℃ annealing the sample to obtain the highest magnetic
Of strength, and room temperature, the sample still showed a clear hysteresis loop, indicating that the material has ferromagnetic properties at room temperature. Analysis of samples
Ferromagnetic properties are mainly derived from the (Ga, Mn) N, and GaxMny with one hand because of the formation of Ga vacancies, can lead to ferromagnetic interactions involved in the regulation
With the increase in hole concentration; other GaxMny phase also enhanced the ferromagnetic sample. Magnetization versus temperature curve further testing
Permit the preparation of the material in this experiment the Curie temperature above room temperature, the test shows that the sample magnetization with temperature trend is clearly divided into two
Part. This result further validates the front to make the (Ga, Mn) N and GaxMny ferromagnetic materials, the relative contribution of reasoning.
Samples of CV test and the test showed that ion implantation into the Hall of defects on the one hand the concentration of carrier impact, on the other hand
Reducing carrier mobility. Reduce the ion implantation induced defects, reduce defects on the properties of dilute magnetic semiconductors is a need
Continue to study the issue. (6) of Mn ions into the Mg-doped GaN samples of magnetic and electrical properties. Magnetic properties
Test results show unintentionally doped with Mn ions into GaN samples similar results, the sample after annealing at 800 ℃ to obtain the highest magnetic
Samples of strength and shows a room temperature ferromagnetism. Test results show that the sample magnetization was higher than Mn ions into the unintentionally doped
GaN samples. MT curves of the samples although the trend is divided into two parts, but unintentional and Mn-doped GaN samples implanted compare
Two changes in slope of the curve was significantly smaller. Analysis that this was mainly due to Mg-doped GaN samples to ensure high hole concentration
(Ga, Mn) N samples of ferromagnetic properties of the leading role. The use of Mg-doped GaN epitaxial films at 700 ℃ were only weakly active treatment
Therefore, when annealing the Mg ion doping will produce the secondary activation, so the sample after 800 ℃, 900 ℃ annealing treatment, as set
Concentration has increased to some extent, but when the annealing temperature higher than 900 ℃, the sample surface from the decomposition of the introduction of the electronic N vacancies,
Making the hole concentration decreased. Electrical test data basically reflect the trend of Mn ions into the Mg-doped GaN samples which
A feature. Degree Year: 2009

Large volume of Fe-Ga magnetostrictive alloy solidification undercooled

Title: Large volume of Fe-Ga magnetostrictive alloy solidification undercooled Author: Zhou Jiankun Degree-granting units: Shanghai Jiao Tong University Key words: magnetostriction;; Fe-Ga;; undercooling;; directional solidification;; magnetic domain;; texture Abstract: Magnetostrictive alloys are important materials, sensors and micro-drive, in the sonar transducer, the field of weapons systems and robotics widely used. Now more commonly used to Tb-Dy-Fe as the representative of a strain of giant magnetostrictive materials, while large, high Curie temperature of excellent performance, but with brittle, disadvantages of higher raw material costs. And in recent years the Department of magnetostrictive Fe-Ga alloy with high strength, good toughness and low cost, and in single crystal materials [100] direction for nearly 400 ppm to neodymium magnets obtain the large magnetostriction, excellent performance, thus making with a wide range of applications and commercial value. Department of magnetostrictive Fe-Ga alloys show a large number of research results: the proper alloy, rapid solidification and oriented growth is the preparation of high performance Fe-Ga material prerequisites. Therefore, to find a large volume can grow, can obtain good orientation and structure of rapidly solidified metastable solidification control technology has become the preparation of high performance Fe-Ga magnetostrictive material like one of the key issues. Undercooling rapid solidification in these areas will undoubtedly have a unique advantage. Undercooling technology is developing rapidly in recent years a new type of rapid solidification technology, in the deep cold conditions, when excited by the nucleation, melt up to several meters per second high-speed growth, crystal growth by artificially controlling alloy when the nucleation conditions, can be prepared by a homogeneous orientation materials, is considered to be potential development of new rapid directional solidification technology. Therefore, this combined cycle using hot molten glass cleaning method carried out the first glass cleaning agent composition and other factors on Fe_ (81) Ga_ (19) alloy purifying effect of the study; for the effective application of rapid solidification of undercooled technology, and carried out under conditions of high undercooling solidification Fe_ (81) Ga_ (19) alloy and its magnetic force microscope evolution research; and on this basis, the introduction of the technology orientation of Fe-Ga alloy material preparation. In addition, the prepared Fe_ (81) Ga_ (19) alloy rods in the preferred orientation of crystal growth, microstructure and magnetic properties were analyzed; Finally, under different undercooling get excited Fe_ undercooled melt (81) Ga_ (19) alloy rod texture and magnetostrictive properties are http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php discussed. Main research results obtained in the following aspects: Through the glass fluxing combined cycle thermal method of B_2O_3, NaSiCa + B_2O_3 (referred to as Na-Si-Ca-Al-B) and Na-Si-Ca-Al-B + Na_2B_4O_7 glass as cleaning agents for Fe_ (81) Ga_ ( 19) the effect of cold melt were analyzed. Glass cleaning mechanisms found B_2O_3 just physical adsorption, can only get smaller too cold; Na-Si-Ca-Al-B glass integrated physical and chemical purification, to obtain large undercooling, but its viscosity is too large, resulting in access to cold degree of instability; Na-Si-Ca-Al-B + Na_2B_4O_7 glass retains the physical and chemical synthesis purification mechanism, while effectively reducing the Na-Si-Ca-Al-B glass viscosity. And analysis of the sample weight, superheat, holding time and other factors on the impact of undercooling, cooling experiments to determine the specific process: the use of 70% Na-Si-Ca-Al-10B +30% Na_2B_4O_7 glass as clean agent, the heating process should be fully in the exhaust temperature below 400 ℃ two minutes at about 200 K superheat, heat 1.5 min, the heat cycle in which Fe_ (81) Ga_ (19) successfully melt up to 300 K undercooling above. Through the cold Fe_ (81) Ga_ (19) alloy microstructure evolution and magnetic domain structures found: 0 ~ 315 K in a wide range of undercooling, Fe_ (81) Ga_ (19) alloy solidification can be divided into three categories: the low undercooling (ΔT ≤ 50 K) the Fusing dendrites, intermediate undercooling range (50 K <ΔT <200 K) of the small and large equiaxed undercooling (ΔT> 200 K) when the recrystallization; and its own formation mechanism was discussed. It is noteworthy that, in the undercooling of 150 ~ 200 K range, solidification in the growth of small granular grains with a certain direction, thus selected as the cold zone directional solidification of undercooled too cold to stimulate degree range. In addition, samples of cold magnetic force microscope studies show, Fe_ (81) Ga_ (19) alloy surface magnetic domain structure on undercooling are also very sensitive to the changes. Based on the above two studies, the use of genetic undercooling, in the 200 K undercooling, the surface through the points to stimulate and inspire the undercooled melt and successfully achieved Fe_ (81) Ga_ (19) alloy undercooled rapid directional solidification. By 200 K undercooling point of excitation under preparation Fe_ (81) Ga_ (19) alloy rods of orientation analysis of directional solidification found some samples of columnar crystals with strong [100] texture of the bar [100] with the specimen axis preferred orientation angle of 10 ° or so, the result is better than the best previous results reported in the literature; by XRD, DSC, TEM samples by means of the microstructure of the bars found undercooling rapid directional solidification of Fe_ (81) Ga_ (19) alloy is not uniform within a fully disordered A2 structure, but in the micro pervaded many of the Ga atom clusters form by the occurrence of lattice distortion of the DO3 structure, and some nano-scale with [111] orientation of the structure of the embedded domain; through the magnetic properties of the sample found in the axial direction of the sample received more than 800 ppm of large magnetostrictive properties, which is almost in the block previously reported Fe -Ga magnetostrictive materials for maximum performance twice, we believe that stimulate the undercooled melt prepared Fe_ (81) Ga_ (19) along the axial direction of the polycrystalline rod height [100] texture as well as rapid solidification process appear in clusters of Ga lattice distortion DO3 structure and composition of non-uniform microstructure is greatly enhanced magnetostrictive properties of the main factors. Finally, to stimulate undercooling on solidification Fe_ (81) Ga_ (19) solidified alloy bars, texture, and its performance was studied and found to stimulate the organization can be directed undercooling range With increased undercooling, stimulate, get bar [100] orientation of a gradual increase in the saturation magnetostrictive properties also increased, from 150 K to stimulate undercooling 210 K 750 ppm to 885 ppm when . In addition, because the sample [100] preferred orientation there is a certain angle with the rod axis, the magnetic field causes the magnetostrictive properties with increasing emergence of the phenomenon first increases and then decreases. Degree Year: 2009

Low Weipu Cyrus blue class complex molecular magnets and nickel nanowire composites and magnetic

Title: Low Weipu Cyrus blue class complex molecular magnets and nickel nanowire composites and magnetic Author: Gao Bo Degree-granting units: Lanzhou University Keywords: Prussian Blue: 7696, nanowire arrays: 5152, nano-particles: 2148, nano-materials: 1426, low-dimensional: 1354, Magnetic study
Study: 1346, Nickel nanowires: 1170, aluminum oxide template: 867, microwave absorption: 690, molecular magnets: 570, spin-glass state: 539, Neodymium Magnets compound
Material: 531, PVP: 327, ac susceptibility: 302, the imaginary part of permeability: 228, dispersion: 216, morphology: 216, composite materials
Material: 187, face-centered cubic structure: 186, magnetic measurements: 143 Abstract:
 Currently, the nature of exploration of new nanomaterials and new nano-materials application development is the forefront of scientific research in the field. We explore
Nano-materials and low-Witt for the purpose of high-frequency applications, preparation of Prussian blue type complexes FeCrCr nanowire molecular magnets, MnFe Prussian
Shi Blue class and the complex molecular http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets magnets magnetic nanoparticles of Ni nanowires complex, their morphology, structure and magnetic properties were studied,
The main conclusions are as follows:
 1 alumina template using a diameter of about 80nm were prepared by the Prussian blue type complexes FeCrCr nanowire arrays,
The results show that nanowires: the crystal structure of the face-centered cubic structure, and there is Cr vacancies; infrared spectra from the nanowires
Son bonding to Fe Ⅱ-CN-Cr Ⅲ and Fen Ⅲ-CN-Cr Ⅱ.
 2. By FeCrCr Prussian blue type complex straight nanowires
Flow and exchange of magnetic susceptibility, and found negative at low temperatures the magnetization and the spin-glass transition. Analysis that the ferromagnetic Fe
-Cr and anti-ferromagnetic Cr-Cr on the temperature dependence of the different result in a negative magnetization, and the structure and the presence of Cr vacancies
Fe-Cr and Cr-Cr ferromagnetic and antiferromagnetic interaction between the competition is to produce spin-glass state the reason.
 3. Topiramate use of polyethylene
Slightly oxazolidinone was synthesized as a stabilizer has good dispersion of nano-MnFe Prussian blue type complex cubic particles, the nano-particles
The results show that: the crystal structure of the face-centered cubic structure, and there is Fe vacancies; research results show that the oxygen ions in nanoparticles
Of the state and the bonding of Fe Ⅲ-CN-Mn Ⅱ and Fe Ⅱ-CN-Mn Ⅲ.
 4 by MnFe Prussian blue type complex nanoparticles directly
Flow and exchange of magnetic susceptibility studies have found that the system also exists in the low temperature spin glass transition, we present the structure analysis of Fe
Space makes the MnFe Prussian blue type complexes have been complete long-range interaction with fcc structure, into a separate phase, however, still weak
Interaction of the ferromagnetic and antiferromagnetic clusters.
 5 were prepared using alumina template line diameter of about 30nm of Ni and Ni nanowires
Nanowires / paraffin compound. The structure of Ni nanowires results show that the crystal structure of the face-centered cubic structure. Ni nano-wire chamber
Temperature hysteresis loops show that the shape anisotropy makes the coercivity increased over blocks.
 6 by the Ni nanowires / paraffin
Complex in 2-18GHz spectrum of magnetic and dielectric spectral analysis, found that the Ni nanowires complex high-frequency skin effect is great to contain, Ni nano
Line of the natural resonance peak at around 10GHz. Discussed the complex nature of the microwave, the results show that although other microwave absorber with
Than the absorption is not very satisfactory, but its mechanism of microwave absorption is of great significance. Degree Year: 2009

High-performance injection molding machine key technologies

　　Title: High-performance injection molding machine key technologies
　　Author: Song Chunhua
　　Degree-granting units: Southwest Jiaotong University
　　Keywords: permanent magnet synchronous servo motor;; energy;; variable piston pump;; fuzzy control;; internal model control;; noise
　　Abstract:
　　The 21st century is the century of science and technology, materials technology with the servo motor's performance has been greatly improved for high-speed injection molding machines, high-precision possible. Advanced control technology to further develop and improve, to achieve electrical connection of the injection molding machine and pump drive servo control system provides a theoretical basis. Microcontrollers, especially the improvement of chip Neodymium Magnets technology and the emergence of dedicated DSP control technology for the algorithm implementation possible.
　　Energy-saving, high-speed, high precision, low noise high-performance injection molding machine control system development. However, high speed and high precision, low noise are often two conflicting directions. Control method to solve the energy optimization and high-speed, high precision of great significance, it is necessary to control the injection molding machine to study. Energy-saving injection molding machine hydraulic system, the flow is from the past and the pressure ratio of the proportion of dual control to load sensitive adaptive control, to the frequency control, servo control and servo-loop control. High-power energy-saving high-performance injection molding machine drive system is indispensable to the system.
　　In response to these problems, this paper first fuzzy prediction method of injection molding machine drive motor - induction motor speed control has been studied; Secondly, the use of internal model control method of injection molding machine drive motor - permanent magnet synchronous servo motor current regulator in-depth study; Third, the fuzzy control variable pump for motor coordination and control; Fourth, for high speed, high precision and low noise conflict between the different between the motor and variable displacement piston conducted a study of the connection; the final analysis, the variable pump injection molding machine servo motor drive system and the principle of energy conservation and energy-saving valve system were compared.
　　Thesis contains the following aspects:
　　1) induction motor speed controller design. In the induction motor control, resistance, reactance, and other parameters of the speed control have a greater error, thereby affecting the speed control accuracy and dynamic response. Induction motor based on a mathematical model to predict the introduction of fuzzy logic control system. Strong coupling for the induction motor characteristics, the method proposed fuzzy predictive control, and fuzzy predictive control http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets method to design high-performance speed controller.
　　2) based on field-oriented control principle, the permanent magnet synchronous motor current regulator internal model control (IMC) design. In the permanent magnet synchronous servo motor vector control, the motor speed range is very wide, the resistance, reactance, and other parameters of the d, q axis current control have a greater error, thereby affecting the speed control accuracy and dynamic response. Matrix singular value analysis of IMC robust current controller, and applied to permanent magnet synchronous motor rotor field oriented vector control. Of the current regulator transfer function of the simulation and the DSP to run the motor vector control experiments, experiments show that the current regulator with the IMC to achieve motor speed, can get a good steady-state tracking performance and high accuracy to improve ability to control the motor and verify that the current regulator in the IMC wide speed-dependent motor parameters when a small good performance.
　　3) From the fuzzy control theory, put forward a fuzzy control method for servo motor control and coordination of the variable pump. Solve the injection molding machine when the low frequency control characteristics of poor, slow dynamic response, speed is not easy to ensure the accuracy and other issues. Coordination with fuzzy internal model control method to solve the problem of speed fluctuation.
　　4) For high speed, high precision and low noise conflict between the motor and variable displacement piston connection between the way the study. Shows the coupling of the servo motor pump system response and noise have a significant impact.
　　5) analysis of the servo motor plus variable pump system energy efficiency principles, through experiments on the servo motor and pump system increases the proportion of variable valve systems were compared.
　　Degree Year: 2009

High temperature superconducting magnetic suspension and three-dimensional numerical study of theoretical models

　　Title: High temperature superconducting magnetic suspension and three-dimensional numerical study of theoretical models
　　Author: Ma light with
　　Degree-granting units: Southwest Jiaotong University
　　Keywords: high-temperature superconductors;; maglev;; three-dimensional theoretical model;; finite element;; preconditioned conjugate gradient Neodymium Magnets method
　　Abstract:
　　Although the theoretical study of high-temperature superconducting Maglev has exceeded two-dimensional or axisymmetric situations limitations, and gradually to more realistic
　　Move closer to the three-dimensional case, but the current three-dimensional theoretical model or ignore the electromagnetic anisotropy of high-temperature superconductors or too simple for its
　　Treatment, resulting in high-temperature superconductors on the electromagnetic properties of the model description is not enough. Therefore, the theoretical study of high-temperature superconducting maglev has yet to be further
　　Further improved.
　　In this paper, Maxwell's equations and high-temperature superconductor resistivity anisotropy, combined with high-temperature superconductors of electricity
　　Magnetic constitutive relation to vector potential as state variable, set up to consider the phenomenon of high temperature superconductor electrical anisotropic three-dimensional electromagnetic field equations
　　. State of motion for the study of the thermal high-temperature superconductors under magnetic coupling, high-temperature superconductors are http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets given control of the temperature field equation. In the real value
　　Current methods, respectively, using Galerkin finite element and Crank-Nicolson-θ finite difference spatial discretization of the equations and
　　Discrete time. In addition, the magnetic track to simulate the gap between the adjacent permanent magnet field caused by the inhomogeneity along the vertical, the use of terrestrial
　　Flow model to establish a permanent magnetic field of three-dimensional analytical model of the track.
　　In the model validation, a detailed comparison of different discussions
　　Sport mode the numerical results and experimental test results, including the vertical movement under the specific field of translation symmetry zero-field cooling, field cooling hanging
　　Three cases with the suspension and floating axisymmetric field in zero field cooling conditions; lateral movement end cold suspension, suspension height is equal to field-cooling height and overhang
　　Linked to three cases; vertical suspension movement under power relationship with changes in exercise time. The results show that the proposed three-dimensional theoretical model can be
　　Better reflect the high-temperature superconductors and the electromagnetic force field. On this basis, the theoretical study of the three-dimensional movement of bulk materials under high-temperature superconducting magnetic
　　Suspension characteristics.
　　For vertical movement, an analysis of working conditions, field structure, material properties and geometry and other effects due to
　　Prime role of the law of levitation force, then discussed the levitation force relaxation characteristics and factors affecting the role of law, improve the bulk of the material obtained
　　Material performance or lower the temperature, can significantly increase the levitation force, but also can effectively suppress or even avoid the conclusion levitation force relaxation decay, and finally from the manager
　　On pre-loaded on the confirmed suspension force can effectively inhibit the relaxation decay, is to improve the stability of the system is an effective means of suspension.
　　For lateral movement, an analysis of working conditions, the maximum horizontal displacement, material properties and geometry and other factors on the electromagnetic force
　　Role of the law, then discussed the critical field of high-temperature superconductors cold height issue, found that with the suspension height increases, the improvement of material properties
　　Or temperature decreases, the critical field-cooling height is gradually reduced, and subsequent suspension for the study of the minimum horizontal feature can restore
　　Method, and finally the process of continuous lateral movement under different conditions with the levitation and guidance force variation of the number of lateral movement had deep
　　Into the analysis, and confirmed the pre-set theory can effectively suppress the lateral movement caused by the levitation force decay.
　　For vertical movement,
　　Into magnetic levitation rail launch and two applications. Maglev launch applications on the study include the track gap,
　　Exit velocity and temperature of the levitation force of law and the different exit velocity and temperature of the maximum temperature rise within the bulk of variation; on track
　　Road traffic applications, the effects of different field-cooling height, suspension height, velocity and temperature during exercise in the suspension force change rules
　　Law, analyzed the velocity and temperature on the maximum temperature rise within the bulk of law. The results show that, for any kind of application, reduced
　　Low bulk temperature, can restrain the levitation force decay and reduce the role of temperature. In addition, the study also found that the resistance floating suspension than
　　Small, this high-temperature superconducting maglev technology in the field of high speed is very favorable.
　　Degree Year: 2009

Multi-level cold atoms in the EIT system to enhance the study of nonlinear effects

Title: Multi-level cold atoms in the EIT system to enhance the study of nonlinear effects Author: Han Yanxu Degree-granting units: Shanxi University Keywords: electromagnetically induced transparency;; MOT;; more dark state;; Tripod system;; cross-phase modulation;; optical thickness Abstract:
 Coherent light and the role of atomic physics in an important research content, the use of coherent light field and over the role of multi-level atomic
Process of quantum interference effects, Neodymium Magnets can produce a lot of interesting physical phenomena. Among them, the electromagnetically induced transparency (EIT) effect by people
General concern, due to reduced EIT medium with absorption and dispersion characteristics of rapid change, in the theoretical and experimental studies have been widely
.
 In the hot atomic vapor atomic physics experiments. Atomic thermal motion of atoms relative to the Doppler effect and
Each collision leading to decoherence effects to experiment brought many negative effects. With laser cooling and trapping neutral atoms and technological development
Cold atomic medium has become the http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets object of study as atomic physics and quantum optics focus of attention.
 This paper describes our experiments on
Establish a set of capture ~ (87) Rb magneto-optical trap cold atoms device to be captured by EIT effect of cold atoms in the observed multi-media
Dark-state phenomenon, the fine cold atomic energy levels in the preparation and magnetic measurements to study the interaction between dark state and trigger the light of the probe light
Enhanced nonlinear effects, and the transformation of the magneto-optical trap system to achieve a light pulse in the cold atomic medium in the storage and release. This
Completed work includes the following:
 1) a brief introduction to laser cooling and trapping neutral atoms in principle, a detailed
Units for cooling and trapping ~ (87) Rb magneto-optical atom trap device. Experimental method to measure the fluorescence collection had captured the number of cold atoms,
Cold atomic cloud size according to deduce the density of cold atomic cloud. The bottom of the cold atoms through the 4mm, 7mm, 10mm cylindrical three incident
Probe beam, the atomic process to obtain short-range free-fall time of flight (Time of Flight, TOF) absorption signal, through the numerical fitting
Get cold atom cloud temperature. The results showed that: the number of trapped cold atoms is about 10 ~ 9, the density is about 10 ~ (11) months / cm ~ 3, cold
But the temperature is about 200μK, the cold atom cloud EIT media can be used as well for our experimental study of atomic coherence.
 
2) observe cold atoms in multi-media phenomenon of the dark state, the magnetic fine level of preparation and distribution of atomic state population-based measurement. In many
Zeeman sub-level system of cold atoms, due to different transitions between Zeeman sub-levels of varying intensity and selection rule restrictions, only
Coupling probe light beam using a bunch of light can form two different EIT system and the width of an absorption system, and observed probe
Light of the multiple transparent windows. In the atomic system through the pump light to select the appropriate incident polarization direction and the direction of high-purity atoms can be
Degree of preparation in the atomic ground state Zeeman sub-levels on any. By the incident probe beam circularly polarized light, the distribution of populations of atoms into the
Line non-destructive measurement. This technology can be used in cold atoms in quantum information and quantum optics experiments being.
 
3) the interaction between dark state and the two beams between the nonlinear optical field cross-phase modulation. In the cold atomic medium, the use of state preparation technique
About 95% of the atoms prepared in the ground state Zeeman sub-level on one, select the appropriate polarization of the probe light, coupling light trigger
Light constitutes an ideal four-level Tripod structure. Coupling light in both resonance frequency of the trigger light conditions, between two dark states
Interaction, accompanied by enhanced non-linear effects, and the use of MZ interferometer measurement of the probe light of the phase change. Adjust the trigger light
The light intensity can be achieved on the probe nonlinear optical field cross-phase modulation, cross-Kerr nonlinearity coefficient to be a maximum of 7.2 × 10 ~
(-5) Cm ~ 2 / W, the nonlinear phase shift produced by 1 × 10 ~ (-2) rad, the results of quantum phase gate toward the goal of achieving a step forward.
 
4) high optical thickness of the magneto-optical trap system. As the original MOT trapping cold atomic medium unit optical thickness is low, can not meet the test
Further request, we will extend the cooling light beam diameter to 22mm, a tapered power amplifier (TPA) system to cool the light
Power amplification, to obtain high optical thickness of the cold atomic medium, and short-range by collecting fluorescence measurement of flight time to get cold the original
Sub-cloud size of 8 × 8 × 6mm ~ 3, the number of cold atoms is about 2.6 × 10 ~ (10), the temperature is about 250μK, mathematical fitting the probe light through the cold
Atomic cloud transmission signal to be trapped cold atomic cloud of optical thickness of 11. In order to further improve the optical thickness of the cold atomic medium,
The four magnetic field gradient by the 8G/cm gradually increased to 20G/cm, on the magneto-optical trap is compressed, the measured optical thickness of the cold atom cloud
16, the temperature is about 300μK.
 5) in high optical thickness of the cold atom cloud will produce a semiconductor laser into the laser probe
Pin light coupling light, and two round trips through the use of sound and light system will shift the frequency of the probe light shift 6.8GHz, observed that the probe light pulse
Cold atomic medium in the storage and release signals, and to study the release of the signal intensity with changes in the parameters of dependence.
 One record
New sex include:
 Ⅰ. The different Zeeman sub-atomic transition between the different intensity levels, in view of the cold atomic medium
Hot atoms in the police to observe more than the dark-state phenomenon, on this basis, by choosing different combinations of coupling light polarized pump light, the
Preparation of high-purity atoms in a magnetic fine any level, the measure proposed and demonstrated a sophisticated level atomic magnetic distribution of all populations
Optical methods.
 Ⅱ. The use of state preparation technique in the cold atomic medium, the preparation of more than 95% of the atoms in a particular
Zeeman sub-level, select the appropriate combination of the probe light polarization, coupling light and trigger the light to form an ideal four-level structure Tripod
. Coupling of the trigger light and light are resonant conditions, the study of the interaction between the dark state, the probe light for measuring light trigger non-linear cross-
Cross-phase modulation.
 Ⅲ. By expanding the cooling light spot diameter, a tapered power amplifier (TPA) system into the cooling power of light
Line amplification, to obtain a high optical depth (OD = 11) of the cold atomic medium, and measured the number of trapped cold atoms and optical thickness of the light with the cooling
The dependence of power changes. Four magnetic field gradient by the 8G/cm gradually increased to 20G/cm, further compressing the MOT, it can be light
Thickness further increased to 16 school. Degree Year: 2009

HCl indium zinc and iron slag to mention the effective use of resources and theoretical studies of the process

Title: HCl indium zinc and iron slag to mention the effective use of resources and theoretical studies of the processAuthor: YongmingDegree-granting units: Central South UniversityKey words: hydrometallurgy;; mention indium;; iron oxide yellow;; zinc ferrite;; iron vitriol slagAbstract:For the effective use of iron sulfide concentrate resources and avoid iron slag dumps pollution on the ecological environment, and simplify the existing iron vitriol slag mention
Indium processes and improve the yield of Neodymium Magnets indium straight and eliminate low concentrations of gas emissions harm SO_2, this paper presents a hydrochloric acid system, put the wet zinc waste
Indium and iron resources, effective use of new technology. First of HCl extraction of indium zinc, iron, yellow iron alum preparation and decomposition of such processes into the alkali residue
Line system and in-depth theoretical analysis, to elaborate on the thermodynamics and kinetics. Double balance method discussed in detail Zn (Ⅱ
)-Fe (Ⅲ)-NH_3-CO_3 ~ (2 -)-C1-H_2O system zinc ferrite precursor co-precipitation process, [Zn] T, [Fe] T, [NH_3] T,
[CO_3 ~ (2 -)] T, pH balance between, to determine the Zn ~ (2 +), Fe ~ (3 +) ions were the best pH range of precipitation
6.3 <pH <7.3.In the theoretical analysis, based on the residue of zinc hot acid leaching, the leaching solution to restore and clean, TBP extraction of indium and zinc
Process of technology research. The results show that the temperature 90 ℃, time of 2h ~ 4h, M_ (HC1) / M_ (Theory) = 1.5 ~ 2.5, liquid-solid
Than L/S- (3 ~ 5): 1 conditions, the zinc slag Zn, Fe, In the leaching rate of more than 95%. To hot acid leaching solution by adding magnetic pyrite
Zinc sulfide ore or concentrate to restore leaching. With pyrrhotite as the reducing agent, in W_ (pyrrhotite) / W_ (Theory) = 1.4, temperature
90 ℃, time 2h, pyrrhotite particle size http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets of 0.088mm ~ 0.106mm optimal conditions, Fe ~ (3 +) reduction rate
96.30%, As ~ (3 +), Sb ~ (3 +) removal rates were 67.7% and 24.77%; the use of zinc sulfide concentrate as reductant at a temperature of 90 ℃,
Time 3h, zinc sulfide concentrate particle size 45μm, W_ (ZnS) / W_ (Theory) = 1.1, under the best conditions, Fe ~ (3 +) the average reduction rate
96.62%, Zn, Fe, In the average leaching rates were 93.89%, 94.46% and 97.89%. Temperature 50 ℃, time 25min, with iron
Volume of 1.6 times the theoretical amount of added iron replacement under optimal conditions, impurity, Cu ~ (2 +), Pb ~ (2 +), Cd ~ (2 +) removal rates were
99.90%, 32% and 17%, In the loss rate <1%. Purification of water from liquid phase acidity 1.5mol · L ~ (-1), the organic phase composed of 70%
TBP +30% sulfonated kerosene, compared to the O / A = 1.5:1, temperature, vibration and standing time were 10min, 3 stage counter-current extraction under the best conditions
While extraction of indium zinc, In, Zn, Sn extraction rate> 99%, Fe ~ (2 +) extraction rate of <1%, thus achieving Fe and Zn, In the effective separation.
In compared to the O: A = 3:1,3 stage counter-current stripping, temperature, vibration and standing time are the best conditions for 5min, the organic load water-extraction
Phase, In, Zn stripping rates were 99% and 60% -90%, while the stripping rate of Sn <3%. Replacement of zinc plates at room temperature in stripping solution In ~ (3 +) can be produced
A sponge indium and pure ZnCl_2 solution, indium replacement rate> 99%.With purified FeCl_2 Raffinate as raw material, adding 2mol · L ~ (-1)
NH_4HCO_3 Preparation of the solution and precipitate Fe (OH) _2 + FeC03 suspension, and then pass into the air oxidation of iron Yellow output. The oxidation process
Follow the "dissolution of ionization. Oxide precipitation" reaction mechanism, nucleation and crystal growth is divided into two stages, the oxidation reactions are interfacial
Control, and its activation energy were 127.26kJ · mol ~ (-1) and 237.86kJ · mol ~ (-1). Oxidation temperature, air flow and system early
Starting pH value of the oxidation rate has a significant influence. Products are derived from iron oxide crystal-shaped or spindle-shaped needle structured α-FeOOH grains together
Integrated sphere.FeCl_2 Raffinate by H_2O_2 oxidation, the composition of the organic phase 80% TBP +20% sulfonated kerosene, aqueous phase acidity
3.5mol · L ~ (-1), compared to the O / A = 3:1, phase contact time 5min, room temperature process conditions, single-stage extraction of iron, the average extraction rate of iron
99.69%; then by comparison O / A = 1.5:1, phase contact time 3min, three counter-current stripping, under conditions of room temperature water stripping, the average iron
Stripping rate of 97.3%. Pure solution and from pure FeCl_3 ZnCl_2 by n_ (Zn): n_ (Fe) = 1:2 mix, the total metal ion concentration
0.3mol · L ~ (-1), adding 0.5mol · L ~ (-1) of NH_4HCO_3 solution as precipitating agent, chemical co-precipitation method at a temperature of 50 ℃
, M (NH_4HCO_3): M_ (Theory) = 1.2:1, stirring speed 600r · min ~ (-1) ~ 850r · min ~ (-1), additives of 16
Alkyl bromide under the conditions of preparation of zinc ferrite process precursor. Zn ~ (2 +), Fe_ (3 +) ion ratio of the basic theory of uniform by Shen
Lake, both liquid precipitation rates were on average Zn99.83% and Fe 99.92%. From a single precursor, dispersed spherical particles, flat
Both particle size of 100nm ~ 120nm, zinc-iron molar ratio of n_ (Zn): n_ (Fe) = 0.999:2. According to thermogravimetric - differential thermal analysis at 500 ℃
~ 700 ℃ calcination temperature of precursor, to get crystal regularity, morphology of a single, narrow size distribution of zinc ferrite powder. However, on calcination temperature
L exacerbated powder reunion, the best calcination temperature of 500 ℃, from zinc ferrite powder average particle size of 150nm or so. Proposed a "NaOH
Decomposition - hydrochloric acid-TBP extraction of indium reduction of zinc leaching "iron vitriol residue containing indium wet processing in the NaOH system in the decomposition of iron alum residue, output
Na_2SO_4 solution and containing In, Zn iron slag. The former impurity purified, concentrated and returned to Glauber's salt crystals recovered decomposition process; the latter into
HCl leaching and selective extraction of TBP In, Zn, after leaching residue as iron enriched by magnetic materials. Of iron alum residue decomposition and decomposition of alkali
Slag HCl leaching process carried out, the results show that W_ (NaoH): W_ (iron alum residue) = 0.3814:1, temperature 60 ℃, liquid-solid ratio 2:1,
Under optimal conditions, the time 2h, iron alum residue decomposition rate of 98.03%, As the leaching rate of 83.36%, In, Cu, Pb, Cd, Ag, Zn,
Sb, Sn and other impurities must stay in the most decomposed residue. DSC-TGA thermal analysis and XRD diffraction analysis showed that the decomposition of iron vitriol slag alkali process, iron
Mainly Fe_3O_4 form into slag. Residue decomposition in Fe, In, Zn contents were 38.81%, 0.23% and 12.89%, the use of HCl in the temperature
Degrees 40 ℃, liquid-solid ratio 7:1, reaction time 2h, M_ (Hcl) / M_ (Theory) = 1.8 under the optimal conditions for leaching, In, Zn, Cu, Cd,
As, Sn, Sb, Pb, Ag total slag leaching rates were 98.26%, 99.35%, 98.79%, 98.93%, 76.27%, 68.50%,
80.12%, 64.82% and 60.80%. Decomposition of Fe 89.25% residue left in the leaching residue leaching residue as high as 52.48% Fe content, the magnetic-rich
Sets and impurity can be used as iron raw material.Hydrochloric acid extraction system, wet waste indium zinc, yellow zinc and iron preparation, iron, zinc new work
Arts achieve low concentration of iron slag and flue gas of zero-emission SO_2, In and Zn directly substantial increase in yield. Raw material can be iron yellow iron, iron acid
Zinc, iron red, iron ore and other forms used effectively to eliminate the iron slag pollution emissions on the environment. This process can be effective at
Reason to mention the traditional hydrometallurgy process output with indium indium, zinc and iron alum residue leaching residue, China's reserves of indium-rich sphalerite resources, high-speed rail
Development and utilization is also important.Degree Year: 2009