Possible Sites for Hydrogen in a New Hydrous Magnesium Silicate Phase G Synthesized at 22GPa and 1050.DEG.C..

  • Kudoh Y.
    Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University
  • Nagase T.
    Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University
  • Mizobata H.
    Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University
  • Ohtani E.
    Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University
  • Sasaki S.
    Materials and Structures Laboratory, Tokyo Institute of Technology
  • Tanaka M.
    Photon Factory, National Laboratory for High Energy Physics

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  • Possible Sites for Hydrogen in a new Hydrous Magnesium Silicate Phase G Synthesized at 22 GPa and 1050℃
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Abstract

A single crystal ofphase G, Mg1. 24Si1. 76H2. 48O6was analized with synchrotron radiation. The structure ofphase G has close structural similarity to that ofstishovite, SiO2. The valence sum ofthe O site is 1. 52, indicating the existenceofhydrogen bonding as anion chemistry for oxygen being OH1/2. The possible sites for hydrogen are along the O-O edge of vacant tetrahedrabetween corners of MgO6 octahedrawhich are separated by a distance of 2. 654 (6) Å.

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