Local Crystal Structures of Ge2Sb2Te5 Revealed by the Atomic Pair Distribution Function Analysis
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概要
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Two types of optical recording crystalline material Ge2Sb2Te5 have been studied by neutron and X-ray powder diffraction measurements. One is the crystalline cubic-phase Ge2Sb2Te5. The other is nanocrystalline-phase Ge2Sb2Te5. In the former, a large atomic displacement of germanium atoms was found by the atomic pair distribution function (PDF) analysis of neutron powder diffraction data. According to the electronic band structure calculation of isoelectronic GeTe, the electrical conductivity at the valence band with holes is not severely affected by the randomness at the cation site, whereas the thermal conductivity is significantly reduced by the randomness. For the nanocrystalline phase, the local crystal structure and the particle size distribution were obtained simultaneously by PDF analysis using a spherical-particle form factor. The lattice parameter is longer than that of the crystalline phase, suggesting an antimony-richer composition than the matrix. This compositional deviation would form the nanoparticle, resulting in nucleation-dominated crystal growth.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2006-11-15
著者
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Kodama Katsuaki
Quantum Beam Directorate Japan Atomic Energy Agency
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Iikubo Satoshi
Quantum Beam Directorate Japan Atomic Energy Agency
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SHAMOTO Shin-ichi
Quantum Beam Directorate, Japan Atomic Energy Agency
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YAMADA Noboru
AV Core Technology Development Center, Matsushita Electric Industrial Co., Ltd.
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Taguchi Tomitsugu
Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Kodama Katsuaki
Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Shamoto Shin-ichi
Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Proffen Thomas
Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
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Yamada Noboru
AV Core Technology Development Center, Matsushita Electric Industrial Co., Ltd., Moriguchi, Osaka 570-8501, Japan
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