Possible Sites for Hydrogen in a New Hydrous Magnesium Silicate Phase G Synthesized at 22 GPa and 1050°C
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A single crystal ofphase G, Mg<SUB>1. 24</SUB>Si<SUB>1. 76</SUB>H<SUB>2. 48</SUB>O<SUB>6</SUB>was analized with synchrotron radiation. The structure ofphase G has close structural similarity to that ofstishovite, SiO<SUB>2</SUB>. The valence sum ofthe O site is 1. 52, indicating the existenceofhydrogen bonding as anion chemistry for oxygen being OH<SUB>1/2</SUB>. The possible sites for hydrogen are along the O-O edge of vacant tetrahedrabetween corners of MgO<SUB>6</SUB> octahedrawhich are separated by a distance of 2. 654 (6) Å.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 134-136, 1998
The Japan Society of High Pressure Science and Technology