Phase transition in MgSiO3 perovskite in the earth's lower mantle

被引：414
|
作者：
Tsuchiya, T [1 ]
Tsuchiya, J [1 ]
Umemoto, K [1 ]
Wentzcovitch, RA [1 ]
机构：
[1] Univ Minnesota, Dept Chem Engn & Mat Sci, Minnesota Supercomp Inst Digital Technol & Adv Co, Minneapolis, MN 55455 USA
来源：
EARTH AND PLANETARY SCIENCE LETTERS | 2004年 / 224卷 / 3-4期
基金：
日本学术振兴会; 美国国家科学基金会;
关键词：
post-perovskite; MgSiO3; first principle; core-mantle boundary; D '' layer;
D O I：
10.1016/j.epsl.2004.05.017
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
A new polymorph of MgSiO3 more stable than the Pbnm-perovskite phase has been identified by first-principles computations. It has the CaIrO3 structure with Cmcm symmetry and consists of SiO3 layers intercalated by eightfold-coordinated Mg ions. High-temperature calculations within the quasiharmonic approximation give a volume change of similar to 1.5% and a Clapeyron slope of similar to 7.5 +/- 0.3 MPa/K at similar to 2750 K and similar to 125 GPa. These pressure-temperature (P-T) conditions are close to those in which a phase transition in MgSiO3-perovskite has been observed by in situ angle dispersive X-ray diffraction measurements. This transition appears to be associated with the W discontinuity. (C) 2004 Elsevier B.V All rights reserved.
引用
收藏
页码：241 / 248
页数：8
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