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Post-Perovskite Phase Transition in MgSiO 3
Abstract
In situ x-ray diffraction measurements of MgSiO 3 were performed at high pressure and temperature similar to the conditions at Earth's core-mantle boundary. Results demonstrate that MgSiO 3 perovskite transforms to a new high-pressure form with stacked SiO 6 -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.
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Citations
Cited by
Crystal structure prediction using ab initio evolutionary techniques: Principles and applications
Oganov, A. R., & Glass, C. W. (2006) · The Journal of Chemical Physics · doi:10.1063/1.2210932 · Cited by 2,596
The Redox State of Earth's Mantle
Frost, D. J., & McCammon, C. A. (2008) · Annual Review of Earth and Planetary Sciences · doi:10.1146/annurev.earth.36.031207.124322 · Cited by 1,134
Temperatures, Heat and Energy in the Mantle of the Earth
Jaupart, C., Labrosse, S., & Mareschal, J.-C. (2007) · Treatise on Geophysics · doi:10.1016/b978-044452748-6.00114-0 · Cited by 121
Structures and stability of calcium and magnesium carbonates at mantle pressures
Pickard, C. J., & Needs, R. J. (2015) · Physical Review B · doi:10.1103/physrevb.91.104101 · Cited by 94
Metadata
- Authors
- Murakami, M., Hirose, K., Kawamura, K., Sata, N., & Ohishi, Y.
- Venue
- Science
- Published
- 2004-05-07
- Volume
- 304
- Issue
- 5672
- Pages
- 855-858
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1984800782
- Cited by
- 1,338
- References
- 0
- FWCI
- 82.78
- Type
- journal article
- Language
- en
- Open access
- closed
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