HIGH-PRESSURE AND HIGH-TEMPERATURE INSITU X-RAY-OBSERVATION OF MGSIO3 PEROVSKITE UNDER LOWER MANTLE CONDITIONS

被引：86
|
作者：
FUNAMORI, N
YAGI, T
机构：
[1] Institute for Solid State Physics, University of Tokyo
来源：
GEOPHYSICAL RESEARCH LETTERS | 1993年 / 20卷 / 05期
关键词：
D O I：
10.1029/92GL02960
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
High pressure and high temperature in situ X-ray observations of MgSiO3 perovskite were carried out using a newly developed Drickamer-type apparatus combined with synchrotron radiation. Variations of the unit cell parameters of the perovskite were observed as a function of temperature up to about 1900 K at 36 GPa. The orthorhombic distortion changed very little and no indication of transformations to higher symmetry phases was observed up to 1900 K. This result indicates that the orthorhombic perovskite is the stable phase of MgSiO3 in the most part of the lower mantle. The thermal expansivity of the perovskite is determined to be larger than 1.7(2) x 10(-5)/K at 36 GPa and room temperature. This value will give an important constraint to the chemical composition of the lower mantle.
引用
收藏
页码：387 / 390
页数：4
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