Pressure dependence of u parameter in ringwoodite up to 7.9 GPa

Yasuhiro Kudoh; Takahiro Kuribayashi; Hiroki Mizobata; Eiji Ohtani; Satoshi Sasaki; Masahiko Tanaka

doi:10.2465/jmps.060316

Pressure dependence of u parameter in ringwoodite up to 7.9 GPa

Yasuhiro Kudoh, Takahiro Kuribayashi, Hiroki Mizobata, Eiji Ohtani, Satoshi Sasaki, Masahiko Tanaka

SCI - Earth Science

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

X-ray diffraction intensities were measured for single-crystal, spinel structure ringwoodite (γ-Mg_1.97SiH_0.03O₄) 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 K_T'=4 was K_T=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.

Original language	English
Pages (from-to)	8-11
Number of pages	4
Journal	Journal of Mineralogical and Petrological Sciences
Volume	102
Issue number	1
DOIs	https://doi.org/10.2465/jmps.060316
Publication status	Published - 2007 Feb 23

Keywords

Bulk modulus
Crystal structure
Silicate spinel
U parameter

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10.2465/jmps.060316

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title = "Pressure dependence of u parameter in ringwoodite up to 7.9 GPa",

abstract = "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.",

keywords = "Bulk modulus, Crystal structure, Silicate spinel, U parameter",

author = "Yasuhiro Kudoh and Takahiro Kuribayashi and Hiroki Mizobata and Eiji Ohtani and Satoshi Sasaki and Masahiko Tanaka",

year = "2007",

month = feb,

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doi = "10.2465/jmps.060316",

language = "English",

volume = "102",

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journal = "Journal of Mineralogical and Petrological Sciences",

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T1 - Pressure dependence of u parameter in ringwoodite up to 7.9 GPa

AU - Kudoh, Yasuhiro

AU - Kuribayashi, Takahiro

AU - Mizobata, Hiroki

AU - Ohtani, Eiji

AU - Sasaki, Satoshi

AU - Tanaka, Masahiko

PY - 2007/2/23

Y1 - 2007/2/23

N2 - 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.

AB - 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.

KW - Bulk modulus

KW - Crystal structure

KW - Silicate spinel

KW - U parameter

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JO - Journal of Mineralogical and Petrological Sciences

JF - Journal of Mineralogical and Petrological Sciences

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ER -

Pressure dependence of u parameter in ringwoodite up to 7.9 GPa

Abstract

Keywords

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