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

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14 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)791-793
Number of pages3
JournalJournal of Synchrotron Radiation
Issue number2
Publication statusPublished - 2001 Mar 1


  • Alkali germanate glass
  • Coordination change
  • High pressure
  • Quartz-type GeO2
  • XAFS

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation


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