Structural basis for the fast phase change of Ge2Sb 2Te5: Ring statistics analogy between the crystal and amorphous states

Shinji Kohara, Kenichi Kato, Shigeru Kimura, Hitoshi Tanaka, Takeshi Usuki, Kentaro Suzuya, Hiroshi Tanaka, Yutaka Moritomo, Toshiyuki Matsunaga, Noboru Yamada, Yoshihito Tanaka, Hiroyoshi Suematsu, Masaki Takata

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Abstract

The three-dimensional atomic configuration of amorphous Ge2 Sb2 Te5 and GeTe were derived by reverse Monte Carlo simulation with synchrotron-radiation x-ray diffraction data. The authors found that amorphous Ge2 Sb2 Te5 can be regarded as "even-numbered ring structure," because the ring statistics is dominated by four- and six-fold rings analogous to the crystal phase. On the other hand, the formation of Ge-Ge homopolar bonds in amorphous GeTe constructs both odd- and even-numbered rings. They believe that the unusual ring statistics of amorphous Ge2 Sb2 Te5 is the key for the fast crystallization speed of the material.

Original languageEnglish
Article number201910
JournalApplied Physics Letters
Volume89
Issue number20
DOIs
Publication statusPublished - 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Kohara, S., Kato, K., Kimura, S., Tanaka, H., Usuki, T., Suzuya, K., Tanaka, H., Moritomo, Y., Matsunaga, T., Yamada, N., Tanaka, Y., Suematsu, H., & Takata, M. (2006). Structural basis for the fast phase change of Ge2Sb 2Te5: Ring statistics analogy between the crystal and amorphous states. Applied Physics Letters, 89(20), [201910]. https://doi.org/10.1063/1.2387870