Distortion of Local Atomic Structures in Amorphous Ge-Sb-Te Phase Change Materials

Akihiko Hirata, T. Ichitsubo, P. F. Guan, T. Fujita, M. W. Chen

研究成果: Article

7 引用 (Scopus)

抄録

The local atomic structures of amorphous Ge-Sb-Te phase-change materials have yet to be clarified and the rapid crystal-amorphous phase change resulting in distinct optical contrast is not well understood. We report the direct observation of local atomic structures in amorphous Ge2Sb2Te5 using "local" reverse Monte Carlo modeling dedicated to an angstrom-beam electron diffraction analysis. The results corroborated the existence of local structures with rocksalt crystal-like topology that were greatly distorted compared to the crystal symmetry. This distortion resulted in the breaking of ideal octahedral atomic environments, thereby forming local disordered structures that basically satisfied the overall amorphous structure factor. The crystal-like distorted octahedral structures could be the main building blocks in the formation of the overall amorphous structure of Ge-Sb-Te.

元の言語English
記事番号205502
ジャーナルPhysical Review Letters
120
発行部数20
DOI
出版物ステータスPublished - 2018 5 18
外部発表Yes

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phase change materials
atomic structure
crystals
topology
electron diffraction
symmetry

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

Distortion of Local Atomic Structures in Amorphous Ge-Sb-Te Phase Change Materials. / Hirata, Akihiko; Ichitsubo, T.; Guan, P. F.; Fujita, T.; Chen, M. W.

:: Physical Review Letters, 巻 120, 番号 20, 205502, 18.05.2018.

研究成果: Article

Hirata, Akihiko ; Ichitsubo, T. ; Guan, P. F. ; Fujita, T. ; Chen, M. W. / Distortion of Local Atomic Structures in Amorphous Ge-Sb-Te Phase Change Materials. :: Physical Review Letters. 2018 ; 巻 120, 番号 20.
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