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Originally published in Science Express on 8 April 2004
Science 7 May 2004:
Vol. 304. no. 5672, pp. 855 - 858
DOI: 10.1126/science.1095932
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Reports

Post-Perovskite Phase Transition in MgSiO3

Motohiko Murakami,1* Kei Hirose,1* Katsuyuki Kawamura,1 Nagayoshi Sata,2 Yasuo Ohishi3

In situ x-ray diffraction measurements of MgSiO3 were performed at high pressure and temperature similar to the conditions at Earth's core-mantle boundary. Results demonstrate that MgSiO3 perovskite transforms to a new high-pressure form with stacked SiO6-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.

1 Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan.
2 Institute for Frontier Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan.
3 Japan Synchrotron Radiation Research Institute, 1-1-1 Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan.

* To whom correspondence should be addressed. E-mail: mmurakam{at}geo.titech.ac.jp (M.M.); kei{at}geo.titech.ac.jp (K.H.)

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