Anomalous x-ray scattering studies of functional disordered materials

1st Conference on Light and Particle Beams in Materials Science 2013

物理学;材料科学

Kohara, S.^1 ; Tajiri, H.^1 ; Song, C.H.^1 ; Ohara, K.^1 ; Temleitner, L.^1,2 ; Sugimito, K.^1 ; Fujiwara, A.^1 ; Pusztai, L.^2 ; Usuki, T.^3 ; Hosokawa, S.^4 ; Benino, Y.^5 ; Kitamura, N.^6 ; Fukumi, K.^6

JASRI/ SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan^1

Wigner Research Centre for Physics, Hungarian Academy of Sciences, P. O. Box 49, H-1525 Budapest, Hungary^2

Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12 Koshirakawa, Yamagata 990-8560, Japan^3

Department of Physics, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, 860-8555 Kumamoto, Japan^4

Faculty of Environmental Science and Technology, Okayama University, 1-1-1 Tsushima-naka, Okayama, Kita-ku, 700-8530, Japan^5

Reserch Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan^6

关键词: Amorphous phase;    Analyzer crystals;    Anomalous X-ray scattering;    Crystal analyzers;    Crystalline phase;    Disordered materials;    Energy resolutions;    Molecular dynamics simulations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/502/1/012014/pdf
DOI  :  10.1088/1742-6596/502/1/012014

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We have developed anomalous x-ray scattering (AXS) spectrometers, that employ intrinsic Ge detectors and crystal analyzers, at SPring-8. The use of LiF analyzer crystal provides us with an energy resolution of ∼ 12 eV. Furthermore, it has been established that the use of AXS technique is essential to reveal the relationship between the atomic structure and its function of a fast phase-change material, Ge2Sb2Te5. We were able to address the issue of why the amorphous phase of fast phase change materials is stable at room temperature for a long time despite the fact that it can rapidly transform to the crystalline phase by using a combination of AXS and large scale density functional theory-based molecular dynamics simulations.