Stabilities of SiO₂ stishovite and CaSiO₃ perovskite under lower mantle condition

T. Yagi Institute for Solid State Physics, University of Tokyo Roppongi, Minato-ku, Tokyo, 106, Japan

Y. Tsuchida Institute for Solid State Physics, University of Tokyo Roppongi, Minato-ku, Tokyo, 106, Japan

S. Kusanagi Department of Physics, Chuo University Kasuga, Bunkyo-ku, Tokyo, 112, Japan

Y. Fukai Department of Physics, Chuo University Kasuga, Bunkyo-ku, Tokyo, 112, Japan

Abstract

Stabilities of SiO₂ stishovite and CaSiO₃ perovskite were studied up to 120 GPa, using diamond-anvil type high pressure apparatus combined with a laser heating system. High pressure in situ X-ray observation clarified that stishovite distorts into slightly dense CaCl₂-type structure above 80 GPa while cubic perovskite type CaSiO₃ remains stable up to 120 GPa.

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Stabilities of SiO₂ stishovite and CaSiO₃ perovskite under lower mantle condition

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Stabilities of SiO₂ stishovite and CaSiO₃ perovskite under lower mantle condition