Electronic and structural changes in the supercooled liquid and glassy As2Se3

Hideoki Hoshino, Itsuro Yamamoto, Takafumi Miyanaga, Hiroyuki Ikemoto, Hirohisa Endo

研究成果: ジャーナルへの寄稿会議記事査読

9 被引用数 (Scopus)

抄録

We have measured extended X-ray absorption fine structure (EXAFS) and dc conductivity σ of the liquid and glassy As2Se3. Each |F(r)|, the magnitude of the Fourier transform of EXAFS oscillations around As and Se atoms, has a symmetric peak around 2.5 angstroms. The curve fitting analysis indicates the presence of chemical order and no homopolar As-As and Se-Se bonds. When liquid As2Se3 is cooled to the glassy state through the supercooled state, the inter-layer correlation increases and the two-dimensional (2D) As2Se3 network structure transforms to a three-dimensional (3D) one. This transformation is the reason for the change in the temperature variation of the coordination number N around 300 °C whose temperature is higher than Tg( = 181 °C). The change in the slope of log σ versus 1/T around 300 °C is assumed to be associated with the appearance of broadened and localized charged defect states near the band tail.

本文言語英語
ページ(範囲)478-482
ページ数5
ジャーナルJournal of Non-Crystalline Solids
250-252 (II)
DOI
出版ステータス出版済み - 1999/08/01
イベントProceedings of the 1998 10th International Conference on Liquid and Amorphous Metals (LAM-10) - Dortmund, Ger
継続期間: 1998/08/301998/09/04

ASJC Scopus 主題領域

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 凝縮系物理学
  • 材料化学

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