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International Conference on Infrared and Millimeter Waves

作者： Jirun Luo Guangjiang Yuan Yinong Su Sushix Zhao Hanxing Liu Shixi Ouyang Wei Pan Deshun Wu Yuantao Luan Yansheng Zhang Lei Zheng Ersheng Wu Zhao Zhang The Institute ofElecnonics Chinese Academy and Sciences Beijing China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Qepamnent of Materials Science and Engineering Tsinghua University Beijing China

ISBN: (纸本)0780374231

Millimeter wave processing of materials is a method which has wide application prospect for improving material characteristics. In this paper, the investigated results of millimeter wave processing of materials in IECAS, such as millimeter wave sintering of Al/sub 2/O/sub 3/, ZnO, Nd/sub 2/Ti/sub 3/O/sub 9/, and chemical syntheses of spinels LiMn/sub 2/O/sub 4/ and LiCo/sub 0.1/Mn/sub 1.99/O/sub 3.92/S/sub 0.08/, as cathode materials of Li-ion batteries, with millimeter wave heating are presented.

关键词： Ceramics Millimeter wave technology Zinc oxide Temperature materials science and technology Cathodes Batteries Heating Acceleration Furnaces

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Microstructure and thermal performance of Al2(1-x)Mg xTi1+xO5

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Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal materials and Engineering 2002年第SUPPL. 1期31卷 91-91页

作者： Shen, Qiang Zhang, Lianmeng Fang, Qing Wang, Chuanbin State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The solid solutions of Al2(1.x)MgxTi 1+xO5 (x=0,0.01,0.05,0.1) were fabricated by the solid phase reaction method, and they were sintered under normal pressure. The thermal performance of Al2(1-x)MgxTi1+xO 5 was mainly investigated. The results show that, the additive MgTi2O5 can not only restrain the decomposition of Al 2TiO5, but also greatly improve the densification of the solid solutions. With increasing mole percent of x, the thermal stability of Al2(1-x)MgxTi1+xO5 increases and the expansion coefficient decreases.

关键词： Al2(1-x)MgxTi1+xO5 Microstructure Thermal decompose Thermal expansion

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Fabrication of a W/W-Mo/Mo System Layered Flier-Plate Material

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材料科学技术学报(英文版) 2001年第z1期17卷 S127-S130页

作者： Chuanbin WANG Qiang SHEN Lianmeng ZHANG State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070 China

A kind of W/W-Mo/Mo system layered flier-plate material (LFP) was fabricated in this study by the methods of powder metallurgy and bonding together. Such LFP had high parallelism,planeness and densification and its density varied from 17.25x103 kg/m3 to 10.22x103 kg/m3 through a total thickness of 3.0 mm. The W-Mo interlayer of this LFP was obtained by hot-press sintering and its densification at 1573 K was studied. Then by using additives 4Ni-3Cu (in wt pct), the LFP was fabricated under 1573 K-30 MPa-60 min. The mechanism of the interfacial bonding of the W/W-Mo/Mo system LFP was also mainly investigated.

关键词： powder metallurgy methods of

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Fabrication of A1/A12O3 Composites and FGM

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材料科学技术学报（英文版） 2001年第6期17卷 646-648页

作者： Hong TAO Chengji Deng Lianmeng ZHANG Runzhang YUAN State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Al/Al2O3 composites of different ratios were hot-press sintered at 575～640℃ under a pressure of 30 MPa for 2 h in a vacuum furnace. It was found that the relative density of the Al/Al2O3composites could be increased evidently with the rise of sinter temperature. No reaction occurred between Al and Al2O3 at the sinter temperatures. Under 640℃-30 MPa-2 h experimental condition, Al/Al2O3 system FGM was successfully fabricated, and its density range changed quasi-continuously from 2.887x103 kg/m3 to 3.1909x103 kg/m3 within the middle 1.0 mmthickness range.

关键词： relative density

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Nanocomposite Films of MoO3 Xerogel with Poly (ethylene oxide) (PEO) Intercalation

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材料科学技术学报（英文版） 2001年第z1期17卷 S124-S126页

作者： Yongsheng HU WEN Chen Qing XU Runzhang YUAN Institute of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070 China

(PEO)xMoO3·nH2O(x=0～2) nanocomposite films were prepared by ion exchange method and polymer solution direct intercalation in sol-gel route. The synthesis and structure of the films were investigated by XRD, DSC, FTIR, etc. The results show that MoO3 xerogel has a layered structure, which arranges in b-direction. The interlayer distance of MoO3 xerogel increases from 0.690 nm at x=0 to 1.308 nm at x=2 after heat treatment. PEO can be completely intercalated into the interlayer at x=0.5～1 and has strong interaction with MoO3 host.

关键词： structure of the films interlayer distance layered structure polymer solution heat treatment ion exchange

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Grain Boundary Diffusion of Oxygen in c-Textured YBa2Cu3O7-δ Films

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中国地质大学学报(英文版) 2001年第3期12卷 221-223页

作者： Li Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070

The dislocation structure in magnetron sputtered c-textured YBCO films deposited on (100)SrTiO3 substrates consists of vertical (//c axis) screw dislocation forests together with layered horizontal (|caxis) edge dislocation net-works. It is found that in the oxygenation process in YBCO films, oxygen diffusion is enhanced greatly by the short circuit paths which we suggest to be the horizontally ( c axis) layered edge dislocation net-works. Diffusion equation for oxygenation was solved with the help of Fishers theory of grain boundary diffusion, and an active energy 1.16 ev.``

关键词： oxygen diffusion YBa2 Cu3 O7 film

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synthesis and growth mechanism of NaFe/sub 4/P/sub 12/ nanowires

Synthesis and growth mechanism of NaFe/sub 4/P/sub 12/ nanow...

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International Conference on Thermoelectrics (ICT)

作者： Xiaobo Hu Hong Liu Jiyang Wang Huaidong Jiang Shanrong Zhao Dongming Zhang Mingyuan Gu Minhua Jiang State Key Laboratory of Crystal Materials Shandong University Jinan China State Key Laboratory of Advanced Technology of Materials Synthesis and Processing Wuhan University of Technology Wuhan China State Key Laboratory of Metal Matrix Composite Shanghai Jiaotong University Shanghai China

Filled skutterudite NaFe/sub 4/P/sub 12/ single crystal nanowires were synthesized by using a hydrothermal-reduction-alloying method. X-ray diffraction (XRD), Electron diffraction (ED), Raman scattering, as well as elemental analysis were used to characterize the product. High-resolution transmission electron microscope (HRTEM) was used to investigate the microstructure of the nanowire. A growth mechanism of NaFe/sub 4/P/sub 12/ nanowire was proposed.

关键词： Nanowires Iron Crystallization Wire Magnetic fields Image resolution Magnetic cores Atomic layer deposition X-ray scattering Cerium

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Preparation and thermoelectric properties of polyaniline/NaFe/sub 4/P/sub 12/ composite

Preparation and thermoelectric properties of polyaniline/NaF...

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International Conference on Thermoelectrics (ICT)

作者： Hong Liu Jiyang Wang Xiaobo Hui Huaidong Jiang Shanrong Zhao Qiang Li R.I. Boughton Minhua Jiang State Key Laboratory of Advanced Technology of Materials Synthesis and Processing Wuhan Technology University Wuhan P. R. China State Key Laboratory of Crystal Materials Shandong University Jinan P. R. China Shandong University Jinan Shandong CN Center for Materials Science Green State University Bowling Green U.S.A

Polyaniline/NaFe/sub 4/P/sub 12/ whiskers and polyaniline/NaFe/sub 4/P/sub 12/ nanowire composites were prepared by an in situ compounding method. X-ray diffraction (XRD), infrared spectra, thermal gravity analysis (TGA) transmission electron microscope (TEM) and electron diffraction (ED) were used to characterize polyaniline and the composites. Polyaniline can grow on the surface of NaFe/sub 4/P/sub 12/ whisker and forms a novel "brush" structure. The mechanism of the forming of the "brush" structure is suggested. The conductivity and Seebeck coefficient of polyaniline and the composites were measured.

关键词： Thermoelectricity Thermal conductivity Conducting materials Crystalline materials Polymers Inorganic materials materials science and technology Laboratories Composite materials X-ray diffraction

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Multi-filling approach for the improvement of thermoelectric properties of skutterudites

Multi-filling approach for the improvement of thermoelectric...

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International Conference on Thermoelectrics (ICT)

作者： L.D. Chen X.F. Tang T. Kawahara J.S. Dyck W. Chen C. Uher T. Goto T. Hirai State Key Laboratory of High Performance Ceramics and Superfine Structure Shanghai Institute of Ceramics Chinese Academy and Sciences Shanghai China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Institute of Materials Research University of Tohoku Sendai Japan Department of Physics University of Michigan Ann Arbor MI USA

Several skutterudite antimonides filled with atoms of different kinds, (Ba, M)/sub y/Co/sub 4/Sb/sub 12/ (M=Ce, La, Sr), have been synthesized by the combination of solid state reaction and melting methods. Thermal conductivity of (Ba,Sr)/sub y/Co/sub 4/Sb/sub 12/ samples shows a behavior similar to that of Ba/sub y/Co/sub 4/Sb/sub 12/. Adding a small amount of Ce or La to the Ba/sub y/Co/sub 4/Sb/sub 12/ system is effective in further reducing the lattice thermal conductivity. The difference in the ionic radii of the two co-filler atoms is the most sensitive factor for scattering of phonons. The multi-filled (Ba, M)/sub y/Co/sub 4/Sb/sub 12/ (M=Sr, Ce, La) show lower Seebeck coefficients as compared to the single-filled Ba/sub y/Co/sub 4/Sb/sub 12/ having the same total filling fraction. It is expected that higher thermoelectric performance could be realized by further optimization of the composition of filler species.

关键词： Thermoelectricity Thermal conductivity Lattices Powders Conducting materials Phonons Filling Atmospheric measurements Laboratories Ceramics

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Solid state reaction synthesis of filled skutterudite compounds (Ce or Y)_y,Fe_xCo_(4-x)Sb_(12) and the effect of filling atoms Ce or Y on lattice thermal conductivity

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Science China Chemistry 2000年第3期43卷 306-312页

作者：唐新峰陈立东後藤孝平井敏雄袁润章 Institute for Materials Research Tohoku University Sendai 980-8577 Japan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The synthesis of filled skutterudite compounds (Ce or Y)_y(Fe)_x(Co)_(4x)(Sb)_(12), through a solidstate reaction using chloride of Ce or Y,high purity powder of Co, Fe, and Sb as starting materials,was investigated. (Ce or Y)_y(Fe)_x(Co)_(4x)(Sb)_(12) (x=0--1.0, y=0--0.15) compounds were obtained at850--1 123 K. The results of Rietveld analysis demonstrate that (Ce or Y)_y(Fe)_x(Co)_(4x)(Sb)_12synthesized by a solid state reaction possesses a filled skutterudite structure. The filling fraction ofCe or Y obtained by Rietveld analysis agrees well with the composition obtained by chemicalanalysis. The lattice constant of (Ce)_y(Fe)_x(Co)_(4x)(Sb)_(12) increases with increasing substitution of Fe at Cosites, and with an increasing Ce filling fraction in the Sb-dodecahedron voids. The lattice thermalconductivity of (Ce or Y)_y(Fe)_x(Co)_(4x)(Sb)_(12) decreases significantly with an increasing Ce or Y fillingfraction in the voids and with substitution of Fe at Co sites.

关键词： filled skutterudite compound solid state reaction lattice thermal conductivity

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