Structural Change of a Volcanic Glass(obsidian) under High Pressure.

DOI Web Site 参考文献20件
  • Okuno M.
    Faculty of Science, Kanazawa University
  • Nakagami S.
    Faculty of Science, Kanazawa University
  • Shimada Y.
    Faculty of Science, Kanazawa University
  • Kusaba K.
    Institute for Material Research, Tohoku University
  • Syono Y.
    Institute for Material Research, Tohoku University
  • Ishizawa N.
    Material and Structural Laboratory of Tokyo Institute of Technology
  • Yusa H.
    National Institute for Research in Inorganic Materials

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  • Structural Change of a Volcanic Glass o

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High pressure structural change of an obsidian from Iceland has been investigated using X-ray radial distribution function (RDF) analysis and Raman spectroscopy. Obsidians have been compressed under 4 GPa at 20°C and 500°C by a cubic anvil apparatus. The obsidian treated under 4 GPa-20°C condition shows almost the same density and RDF curve as the original obsidian. However, the permanent densification of about 9% was observed by the compression under 4 GPa-500°C Based on RDF and Raman analyses, the structure of obsidian may change in the dominant TO4 (T=Si and Al) from 5 and 6 to 4 and 3 membered rings by the compression at 500°C.

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