Pressure dependence of u parameter in ringwoodite up to 7.9 GPa

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概要

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• X-ray diffraction intensities were measured for single-crystal, spinel structure ringwoodite (γ-Mg1.97SiH0.03O4) at pressures up to 7.9 GPa in the BL-10A synchrotron beam line of the Photon Factory. The isothermal bulk modulus calculated using the Birch-Murnaghan equation of state assuming KT' = 4 was KT = 184(6) GPa. The difference between this result and the value for anhydrous ringwoodite is not significant within the limit of experimental error due to a minimal H2O content. The oxygen positional parameter u was revealed to increase significantly with pressure, approaching the ideal value of 1/4 for cubic closest packing. The mean Si-O distance remained almost constant up to 7.9 GPa, with compression of the unit cell occurring in proportion to that of the MO6 octahedron.

• 日本鉱物科学会の論文

著者

• Tanaka Masahiko

  Institute Of Materials Structure Science High Energy Accelerator Research Organization

• Ohtani Eiji

  Institute Of Mineralogy Petrology And Economic Geology Faculty Of Science Tohoku University

• Kudoh Yasuhiro

  Institute Of Mineralogy Petrology And Economic Geology Faculty Of Science Tohoku University

• Mizobata Hiroki

  Institute Of Mineralogy Petrology And Economic Geology Faculty Of Science Tohoku University

• Kuribayashi Takahiro

  Institute Of Mineralogy Petrology And Economic Geology Faculty Of Science Tohoku University

• Sasaki Satoshi

  Materials and Structure Laboratory, Tokyo Institute of Technology, Nagatsuta 4259, Midori, Yokohama 226-8503, Japan

• TANAKA Masahiko

  Institute of Materials Structure Science, High Energy Accelerator Reasearch Organization

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