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Large Magnetostriction from Morphotropic Phase Boundary in Ferromagnets

Physical Review Letters 2010年第19期104卷 197201-197201页

作者： Sen Yang Huixin Bao Chao Zhou Yu Wang Xiaobing Ren Yoshitaka Matsushita Yoshio Katsuya Masahiko Tanaka Keisuke Kobayashi Xiaoping Song Jianrong Gao Multi-disciplinary Materials Research Center Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Xi’an Jiaotong University Xi’an 710049 China Ferroic Physics Group National Institute for Materials Science Tsukuba 305-0047 Ibaraki Japan National Institute for Materials Science Beamline BL15XU Spring-8 1-1-1 Kohto Sayo-cho Hyogo 679-5148 Japan Key Lab of Electromagnetic Processing of Material Northeastern University 3-11 Wenhua Road Shenyang 110004 China

For more than half of a century, morphotropic phase boundary (MPB) in ferroelectric materials has drawn constant interest because it can significantly enhance the piezoelectric properties. However, MPB has been studied merely in ferroelectric systems, not in another large class of ferroic systems, the ferromagnets. In this Letter, we report the existence of an MPB in a ferromagnetic system TbCo2−DyCo2. Such a magnetic MPB involves a first-order magnetoelastic transition, at which both magnetization direction and crystal structure change simultaneously. The MPB composition demonstrates a 3–6 times larger “figure of merit” of magnetostrictive response compared with that of the off-MPB compositions. The finding of MPB in ferromagnets may help to discover novel high-performance magnetostrictive and even magnetoelectric materials.

关键词： Ferromagnetism

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Preparation of High Performance Green Alumina Ceramic Balls by Roller Production Waste

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武汉理工大学学报（材料科学版）（英文版） 2008年第1期23卷 134-138页

作者： ZHONG Lianyun WU Bolin ZHANG Lianmeng ZHANG Guifang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Key Lab of Nonferrous Materials and New Processing Technology( Guangxi University Guilin University of Technology) of Ministry of EducationGuilin 541004China School of Chemistry and Ecological Engineering Guangxi University for NationalitiesNanning 530006China Key Lab of Nonferrous Materials and New Processing Technology Guangxi University Guilin University of Technology of Ministry of EducationGuilin 541004China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

To reuse roller waste as a raw material of high performance green ceramic balls,three kinds of white alumina ceramic balls whose wear resistance were 2-3 times of the best high alumina ceramic ball with90% Al2O3 were prepared,and the Al2O3 content of the prepared balls was 75%.It is found that the effect of calcia and magnesia on the wear resistance of ceramic balls is contrast to the accepted one: the wear rate of the ceramic balls prepared in CaO-Al2O3-SiO2 system is the lowest and the wear rate of the ceramic balls prepared in MgO-Al2O3-SiO2 is the *** main crystal phase of the ceramic ball is mullite and *** ceramic ball granular is uniform and fine with 4-5 um average *** pore diameter is about 2 *** wear way of the ceramic balls is mainly transcrystalline fracture.

关键词： roller production waste alumina ceramic ball wear resistance white transcrystalline fracture

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Preparation of W/W-Cu/Cu system functionally graded material by one-step hot-press sintering

Preparation of W/W-Cu/Cu system functionally graded material...

引用

2nd International Congress on Ceramics, ICC 2008

作者： Wang, C.B. Zeng, H. Shen, Q. Li, L. Zhang, L.M. State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9788880800842

A material in the system W/W-Cu/Cu with a density gradient, which has an important application in dynamic high pressure physics, was prepared by one-step hot-press sintering. W-Cu composite interlayers were produced from W and Cu powders with Zn (2wt%) as the sintering aid. With increasing the sintering temperature, the relative density of W-Cu composites increased, reaching a higher value (>96%) at 850°C. Then by inserting three W-Cu composite interlayers between the tungsten and copper alloy plates followed by one-step hot-press at 850°C-20MPa-60min, a wholly dense W/W-Cu/Cu system functionally graded material was obtained, which had a large density range from 8.9 to 17.25g/cm3.

关键词： Functionally graded materials

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Effect of annealing on laser-ablated *** 5+xO15+2x thin films

Effect of annealing on laser-ablated *** 5+xO15+2x thin film...

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作者： Zhan, Z.S. Gong, Y.S. Wang, C.B. Shen, Q. Zhang, L.M. State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China

In this study, K3Li2-xNb5+xO 15+2x (KLN) thin films were prepared by laser-ablated a sintered ceramic target. For an optimum deposition condition, in-situ post annealing method was employed on as-deposited films. XRD measurements showed that KLN films with (310) preferred orientation were obtained on fused quartz substrate. Surface morphology studies indicated mat in-situ post annealing could improve the surface quality of KLN thin films. The average transmittance of as-deposited and annealed films in the visible range was nearly 80% to 90%.

关键词： Thin films

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Optical properties of pulsed laser deposited K3Li2Nb5O15 thin films

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Rengong Jingti Xuebao/Journal of Synthetic Crystals 2008年第2期37卷 297-300页

作者： Zhan, Zu-Sheng Gong, Yan-Sheng Wang, Chuan-Bin Shen, Qiang Zhang, Lian-Meng State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China

Potassium lithium niobate (KLN:K3Li2Nb5O15) thin films have been deposited on quartz glass by pulsed laser deposition (PLD) technique using a stoichiometric KLN target, which was prepared by solid reaction with K2CO3, Li2CO3, and Nb2O5 powders as starting materials. X-ray diffraction (XRD) and Raman studies have revealed that tetragonal tungsten-bronze-type structure of KLN films with (310) preferred orientation could be achieved at the substrate temperature of 700°C and the oxygen partial pressure of 10 Pa. The average transmittance of as-deposited thin films in the visible range was nearly 90%.

关键词： Ferroelectric thin films

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Thermal Stress Calculation and Fabrication of 6063 Al/60SiC‐35Al‐5Si Graded materials by Spark Plasma Sintering

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AIP Conference Proceedings 2008年第1期973卷 844-849页

作者： Zhang Dongming Zhang Lianmeng Gu Xiaofeng Chen Fei State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P.R. China

The high intensity of thermal stress was generated during fabrication of 6063 aluminum/60SiC‐35Al‐5Si double‐layer material. In order to decrease the thermal stress, graded materials of Al/60SiC‐35Al‐5Si was fabricated by spark plasma sintering. The CTE in the graded layer was controlled by SiC fraction and particle sizes. The calculation results indicate that the net stress of more than 800 MPa was generated in the double‐layer materials, but it decreased to 170 MPa or less in the graded materials. So the stability can be guaranteed in the graded composites. The graded layers also have the potential for high thermal conductivity, more than 180W/Mk for every layer, which satisfies the application.

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Preparation of Silicon Nitride Multilayer Ceramic Radome material and Optimal Design of the Wall Structure

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AIP Conference Proceedings 2008年第1期973卷 889-894页

作者： Chen Fei Shen Qiang Zhang Lianmeng State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China

A study of silicon nitride ceramic radomes, which includes preparation of the material and optimal design of the radome wall structure, is presented in this paper. Multilayer radome wall structure with high dielectric constant skins and a low dielectric constant core layer is used for broadband application. As a candidate material for both the skins and core layer, silicon nitride ceramics of controlled dielectric constant in the range 3.0∼7.5 were prepared by adding different content of sintering aids such as magnesia, alumina, silica and zirconium phosphate binder and choosing suitable sintering methods. A computer aided design (CAD) for the wall structure of silicon nitride multilayer ceramic radome based on microwave equivalent network method is carried out according to design requirements. By optimizing the thickness of skins and core layer, the power transmission efficiency of such a multilayer Si3N4 ceramic radome is calculated. The calculated results suggest that when the dielectric constant of skins lies in the range 6∼7.5 and core layer in the range 3.5∼4, the power transmission efficiency is above 85% with frequency of 2∼18 GHz while the thickness of skins is less than 0.03λ and the thickness ratio of skins to core layer is less than 1:15.

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Fabrication of Silicon Nitride Ceramics with Pore Gradient Structure

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AIP Conference Proceedings 2008年第1期973卷 3-8页

作者： Zhang Lian‐meng Chen Fei Shen Qiang Yan Fa‐qiang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China

In the present study, Si3N4 ceramics with pore gradient structure were prepared by spark plasma sintering (SPS) technique. Silicon nitride ceramics with different controlled porosities were prepared by using ZrP2O7 as a binder material and heat treated at 1100 °C in a pressureless nitrogen atmosphere. Si3N4 ceramics with controlled porosity of 34–47% were obtained. The distribution of porous structure was homogenous. Fully dense Si3N4 ceramics could be sintered at 1400∼1600 °C by using MgO and alumina Al2O3 as the sintering aids. Pore gradient structure was formed by laminating the Si3N4 porous ceramics and powder mixture was used to obtain fully dense ceramics, and then sintering at 1400–1600 °C. Microstructure of sintered samples was observed by scanning electronic microscope (SEM) and the change of phase compositions was analyzed by X‐ray diffraction (XRD). The results showed that these samples exhibited a good porous graded structure with a highly porous layer and a dense surface layer. The major phase of the Si3N4 ceramics was still α phase.

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Preparation of High Performance Grccn Alumina Ceramic Balls by Roller Production Waste

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Journal of Wuhan University of technology(materials Science) 2008年第1期23卷 134-138页

作者：钟莲云吴伯麟 ZHANG Lianmeng ZHANG Guifang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Lab of Nonferrous Materials and New Processing Technology （ Guangxi University Guilin University of Technology ） of Ministry of Education Guilin 541004 China School of Chemistry and Ecological Engineering Guangxi University for Nationalities Nanning 530006 China

To reuse roller waste as a raw material of high performance green ceramic balls, three kinds of white alumina ceramic balls whose wear resistance were 2-3 times of the best high alumina ceramic ball with 90% Al2O3 were prepared, and the Al2O3 content of the prepared balls was 75%. It is found that the effect of calcia and magnesia on the wear resistance of ceramic balls is contrast to the accepted one： the wear rate of the ceramic balls prepared in CaO-Al2O3-SiO2 system is the lowest and the wear rate of the ceramic balls prepared in MgO-Al2O3-SiO2 is the highest. The main crystal phase of the ceramic ball is mullite and corundum. The ceramic ball granular is uniform and fine with 4-5 μm average size. The pore diameter is about 2 μm. The wear way of the ceramic balls is mainly transcrystalline fracture.

关键词： roller production waste alumina ceramic ball wear resistance white transcrystalline fracture

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Experimental technique for quasi-isentropic compression via ramp-wave generator

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2008年第3期30卷 1-4页

作者： Wang, Chuan-Bin Shen, Qiang Qiu, Hui-Guang Zhang, Lian-Meng State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A kind of Li2O-Al2O3-SiO2 system glass-ceramics, which had a low coefficient of thermal expansion, was prepared by melting method and used as the ramp-wave generator material. On one-stage light-gas gun, the experimental technique for quasi-isentropic compression via the ramp-wave generator was explored. By impacting the ramp-wave generator, quasi-isentropic compression waves with an extended wave's front were produced. The quasi-isentropic loadings to LY12-A1 samples were further realized via the ramp-wave generator. The results showed that the more the thickness of the ramp-wave generator, the longer the front of the generated waves and the lower the rate of the compression. The present research offered a feasible loading means for the quasi-isentropic compression under low pressures.

关键词： Glass-ceramics Quasi-isentropic compression Ramp-wave generator

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