Equation of state of a high-pressure phase of Gd3Ga5O12

被引：17

作者：

Mao, Z. ^{[1
,2
]}

Dorfman, S. M. ^{[1
]}

Shieh, S. R. ^{[3
]}

Lin, J. F. ^{[2
]}

Prakapenka, V. B. ^{[4
]}

Meng, Y. ^{[5
]}

Duffy, T. S. ^{[1
]}

机构：

[1] Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA

[2] Univ Texas Austin, Dept Geol Sci, Jackson Sch Geosci, Austin, TX 78712 USA

[3] Univ Western Ontario, Dept Earth Sci Phys & Astron, London, ON N6A 5B7, Canada

[4] Univ Chicago, Argonne Natl Lab, CARS, Argonne, IL 60439 USA

[5] Carnegie Inst Sci, HPCAT, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 05期

关键词：

HIGH-TEMPERATURE CREEP; LATTICE STRAINS; GALLIUM; GARNET; SYSTEM; GPA; TRANSITIONS; PEROVSKITE; DIAMOND; RHENIUM;

D O I：

10.1103/PhysRevB.83.054114

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Gd3Ga5O12 (GGG), which crystallizes in the garnet structure at ambient conditions, was observed to transform to a high-pressure phase at 88 GPa after laser heating at 1500 K. This new phase is stable at least up to 180 GPa, and can be preserved on decompression to 50 GPa. This phase is cubic and consistent with a perovskite structure of stoichiometry (Gd0.75Ga0.25)GaO3. The zero-pressure bulk modulus, K-0, obtained from fitting to a Birch-Murnaghan equation of state is 373(5) GPa with a fixed pressure derivative K-0' = 4. At 170 GPa, the bulk modulus of perovskite-type GGG is 979(15) GPa, which is comparable to that of diamond at the same pressure [956(21) GPa] and consistent with recently reported shock-compression data for Gd3Ga5O12. The new high-pressure phase of Gd3Ga5O12 is thus highly incompressible.

引用

页数：6

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