XAFS Analysis of Crystal GeCu2Te3 Phase Change Material

Kenji Kamimura; Koji Kimura; Shinya Hosokawa; Naohisa Happo; Hiroyuki Ikemoto; Yuji Sutou; Satoshi Shindo; Yuta Saito; Junichi Koike

doi:10.1515/zpch-2015-0672

XAFS Analysis of Crystal GeCu₂Te₃ Phase Change Material

Kenji Kamimura^*, Koji Kimura, Shinya Hosokawa, Naohisa Happo, Hiroyuki Ikemoto, Yuji Sutou, Satoshi Shindo, Yuta Saito, Junichi Koike

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The structure of crystal GeCu₂Te₃ was investigated by X-ray absorption fine structure (XAFS) measurement. We found that the Ge-Te interatomic distances obtained from XAFS are larger than those obtained from X-ray diffraction, and the Cu-Te distances are smaller. The averaged Ge-Te and Cu-Te distances obtained from XAFS are almost equal to the corresponding interatomic distances in amorphous GeCu₂Te₃. Therefore both crystal and amorphous GeCu₂Te₃ seem to be built up of the same local configurations of GeTe₄ and CuTe₄ tetrahedrons. This would be the reason why the phase change in GeCu₂Te₃ occurs very fast.

Original language	English
Pages (from-to)	433-443
Number of pages	11
Journal	Zeitschrift fur Physikalische Chemie
Volume	230
Issue number	3
DOIs	https://doi.org/10.1515/zpch-2015-0672
State	Published - 2016/03/28

Keywords

Phase Change Material
XAFS

ASJC Scopus subject areas

Physical and Theoretical Chemistry

Access to Document

10.1515/zpch-2015-0672

Cite this

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title = "XAFS Analysis of Crystal GeCu2Te3 Phase Change Material",

abstract = "The structure of crystal GeCu2Te3 was investigated by X-ray absorption fine structure (XAFS) measurement. We found that the Ge-Te interatomic distances obtained from XAFS are larger than those obtained from X-ray diffraction, and the Cu-Te distances are smaller. The averaged Ge-Te and Cu-Te distances obtained from XAFS are almost equal to the corresponding interatomic distances in amorphous GeCu2Te3. Therefore both crystal and amorphous GeCu2Te3 seem to be built up of the same local configurations of GeTe4 and CuTe4 tetrahedrons. This would be the reason why the phase change in GeCu2Te3 occurs very fast.",

keywords = "Phase Change Material, XAFS",

author = "Kenji Kamimura and Koji Kimura and Shinya Hosokawa and Naohisa Happo and Hiroyuki Ikemoto and Yuji Sutou and Satoshi Shindo and Yuta Saito and Junichi Koike",

note = "Publisher Copyright: {\textcopyright} 2015 Walter de Gruyter Berlin/Boston.",

year = "2016",

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doi = "10.1515/zpch-2015-0672",

language = "英語",

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T1 - XAFS Analysis of Crystal GeCu2Te3 Phase Change Material

AU - Kamimura, Kenji

AU - Kimura, Koji

AU - Hosokawa, Shinya

AU - Happo, Naohisa

AU - Ikemoto, Hiroyuki

AU - Sutou, Yuji

AU - Shindo, Satoshi

AU - Saito, Yuta

AU - Koike, Junichi

PY - 2016/3/28

Y1 - 2016/3/28

N2 - The structure of crystal GeCu2Te3 was investigated by X-ray absorption fine structure (XAFS) measurement. We found that the Ge-Te interatomic distances obtained from XAFS are larger than those obtained from X-ray diffraction, and the Cu-Te distances are smaller. The averaged Ge-Te and Cu-Te distances obtained from XAFS are almost equal to the corresponding interatomic distances in amorphous GeCu2Te3. Therefore both crystal and amorphous GeCu2Te3 seem to be built up of the same local configurations of GeTe4 and CuTe4 tetrahedrons. This would be the reason why the phase change in GeCu2Te3 occurs very fast.

AB - The structure of crystal GeCu2Te3 was investigated by X-ray absorption fine structure (XAFS) measurement. We found that the Ge-Te interatomic distances obtained from XAFS are larger than those obtained from X-ray diffraction, and the Cu-Te distances are smaller. The averaged Ge-Te and Cu-Te distances obtained from XAFS are almost equal to the corresponding interatomic distances in amorphous GeCu2Te3. Therefore both crystal and amorphous GeCu2Te3 seem to be built up of the same local configurations of GeTe4 and CuTe4 tetrahedrons. This would be the reason why the phase change in GeCu2Te3 occurs very fast.

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