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Post-Perovskite Phase Transition in MgSiO <sub>3</sub>
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- Motohiko Murakami
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan.
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- Kei Hirose
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan.
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- Katsuyuki Kawamura
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan.
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- Nagayoshi Sata
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan.
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- Yasuo Ohishi
- Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan.
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Description
<jats:p> In situ x-ray diffraction measurements of MgSiO <jats:sub>3</jats:sub> were performed at high pressure and temperature similar to the conditions at Earth's core-mantle boundary. Results demonstrate that MgSiO <jats:sub>3</jats:sub> perovskite transforms to a new high-pressure form with stacked SiO <jats:sub>6</jats:sub> -octahedral sheet structure above 125 gigapascals and 2500 kelvin (2700-kilometer depth near the base of the mantle) with an increase in density of 1.0 to 1.2%. The origin of the D″ seismic discontinuity may be attributed to this post-perovskite phase transition. The new phase may have large elastic anisotropy and develop preferred orientation with platy crystal shape in the shear flow that can cause strong seismic anisotropy below the D″ discontinuity. </jats:p>
Journal
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- Science
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Science 304 (5672), 855-858, 2004-05-07
American Association for the Advancement of Science (AAAS)
