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American Mineralogist; April 2008; v. 93; no. 4; p. 653-657; DOI: 10.2138/am.2008.2645
© 2008 Mineralogical Society of America
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High-pressure phase relation of MnSiO3 up to 85 GPa: Existence of MnSiO3 perovskite

Kiyoshi Fujino1,*, Keisuke Suzuki1, Daisuke Hamane1, Yusuke Seto1, Takaya Nagai1 and Nagayoshi Sata2

1 Department of Natural History Sciences, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
2 Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa 237-0061, Japan

Correspondence: * E-mail: kiyoshi-fujino{at}mail.sci.hokudai.ac.jp

The high-pressure phase relation of MnSiO3 was examined up to 85 GPa and 2600 K using a laser-heated diamond-anvil cell combined with synchrotron radiation. MnSiO3 garnet decomposes into a mixture of MnO with a rock-salt structure (B1) + SiO2 stishovite at pressures higher than ~20 GPa and temperatures higher than ~1200 K. However, MnO (B1) + SiO2 stishovite further transforms to a perovskite structure with increasing pressure. The phase boundary between these structures is positive in the pressure-temperature diagram. The triple point of garnet, MnO + SiO2 and perovskite in the pressure-temperature diagram is ~20 GPa and 1200 K. MnSiO3 perovskite is orthorhombic, and consistent with space group Pbnm, both at high pressure and high temperature and at high pressure and room temperature, but becomes amorphous during decompression. The refined cell parameters of MnSiO3 perovskite at 85 GPa and 2600 K are a = 4.616(2) Å, b = 4.653(2) Å, c = 6.574(3) Å, and V = 141.2(2) Å3. The a/b ratio increases (approaches 1) with pressure and temperature, while the {surd}2a/c ratio remains nearly constant (<1). This indicates that the orthorhombic distortion decreases and the structure tends toward a tetragonal perovskite with increasing pressure and temperature.

Key Words: MnSiO3 perovskite • MnSiO3 garnet • MnO with a rock-salt structure • laser-heated diamond anvil cell






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