Compressibility of Ca3Al2Si3O12 perovskite up to 55 GPa

被引：4

作者：

Greaux, Steeve ^{[1
,2
]}

Andrault, Denis ^{[3
]}

Gautron, Laurent ^{[4
]}

Bolfan-Casanova, Nathalie ^{[3
]}

Mezouar, Mohamed ^{[5
]}

机构：

[1] Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan

[2] Tokyo Inst Technol, Earth Life Sci Inst, Tokyo 1528550, Japan

[3] Univ Blaise Pascal, Lab Magmas & Volcans, Clermont Ferrand, France

[4] Univ Paris Est, Lab Geomat & Geol Ingn, Marne La Vallee, France

[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

PHYSICS AND CHEMISTRY OF MINERALS | 2014年 / 41卷 / 06期

关键词：

Grossular garnet; CaSiO3; perovskite; Aluminum; High pressure; In situ X-ray diffraction; EQUATION-OF-STATE; HIGH-PRESSURE; CASIO3; PEROVSKITE; PHASE-RELATIONS; AB-INITIO; TRANSITION; GARNET; SYSTEM; AL; TRANSFORMATION;

D O I：

10.1007/s00269-014-0673-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Compressibility of perovskite-structured Ca3Al2Si3O12 grossular (GrPv) was investigated at high pressure and high temperature by means of angle-dispersive powder X-ray diffraction using a laser-heated diamond anvil cell. We observed the Pbnm orthorhombic distortion for the pure phase above 50 GPa, whereas below this pressure, Al-bearing CaSiO3 perovskite coexists with an excess of corundum. GrPv has a bulk modulus (K (0) = 229 +/- A 5 GPa; fixed to 4) almost similar to that reported for pure CaSiO3 perovskite. Its unit-cell volume extrapolated to ambient conditions (V (0) = 187.1 +/- A 0.4 (3)) is found to be similar to 2.5 % larger than for the Al-free phase. We observe an increasing unit-cell anisotropy with increasing pressure, which could have implications for the shear properties of Ca-bearing perovskite in cold slabs subducted into the Earth's mantle.

引用

页码：419 / 429

页数：11

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