Structural changes of quartz-type crystalline and vitreous GeO2 under pressure

Osamu Ohtaka, Akira Yoshiasa, Hiroshi Fukui, Kei Ichiro Murai, Maki Okube, Yoshinori Katayama, Wataru Utsumi, Yasuo Nishihata

研究成果: Article査読

14 被引用数 (Scopus)

抄録

Using a large volume high pressure apparatus, quartz-type crystalline GeO2 and Li2O-4GeO2 glass have been compressed up to 14 GPa at room temperature and their local structural changes have been investigated by an in-situ XAFS method. In quartz-type crystalline GeO2, the change of the coordination number from 4 to 6 begins above 8 GPa and finishes below 12 GPa. On decompression, reversal transition begins below 8 GPa and there is a large hysteresis. Almost no sixfold coordination of Ge is preserved after releasing pressure. Change of coordination number in vitreous Li2O-4GeO2 begins above 6 GPa and is completed below 10 GPa. Reversal transition begins below 10 GPa and the hysteresis is smaller than that of quartz-type GeO2. Change of coordination number in vitreous Li2O-4GeO2 is also reversal.

本文言語English
ページ(範囲)791-793
ページ数3
ジャーナルJournal of Synchrotron Radiation
8
2
DOI
出版ステータスPublished - 2001 3 1

ASJC Scopus subject areas

  • 放射線
  • 核物理学および高エネルギー物理学
  • 器械工学

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