Post-Perovskite Phase Transition in MgSiO3

Motohiko Murakami, Kei Hirose, Katsuyuki Kawamura, Nagayosh Sata, Yasuo Ohishi

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1038 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)855-858
Number of pages4
JournalScience
Volume304
Issue number5672
DOIs
Publication statusPublished - May 7 2004

ASJC Scopus subject areas

  • General

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    Murakami, M., Hirose, K., Kawamura, K., Sata, N., & Ohishi, Y. (2004). Post-Perovskite Phase Transition in MgSiO3. Science, 304(5672), 855-858. https://doi.org/10.1126/science.1095932