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Phase F,a new hydrous magnesium silicate synthesized at 1000 °C and 17 GPa: Crystal structure and estimated bulk modulus |
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| Authors: | Y Kudoh T Nagase S Sasaki M Tanaka M Kanzaki |
| Institution: | 1. Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, 980, Sendai, Japan 2. Research Labortory of Engineering Materials, Tokyo Institute of Technology, Nagatuda, 227, Yokohama, Japan 3. Photon Factory, National Laboratory for High Energy Physics, Tsukuba, 305, Ibaraki, Japan 4. Department of Inorganic Materials, Tokyo Institute of Technology, Meguro, 152, Tokyo, Japan |
| Abstract: | The structure of phase F, a non-stoichiometric hydrous silicate synthesized in a uniaxial, split-sphere, multi-anvil apparatus at conditions of 17 GPa and 1000° C, has been solved and refined in space group P63cm, using synchrotron X-ray data for a single crystal of a size 18 × 24 × 30 μm. The composition and unit cell for phase F are Mg3.35Si5.51H7.26O18, a=5.073(3) Å, c=14.013(9) Å, 7= 312.3(5) Å3. The structure contains layers with many similarities to superhydrous phase B. The layers of oxygen atoms are stacked in the ABCBAC-type double cubic closest packing arrangement. The bulk modulus of phase F was estimated from the structural and compositional relationship to superhydrous phase B and periclase. |
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