Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions

被引：63

作者：

Spaulding, D. K. ^{[1
]}

McWilliams, R. S. ^{[5
,6
]}

Jeanloz, R. ^{[1
,2
,3
]}

Eggert, J. H. ^{[4
]}

Celliers, P. M. ^{[4
]}

Hicks, D. G. ^{[4
]}

Collins, G. W. ^{[4
]}

Smith, R. F. ^{[4
]}

机构：

[1] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 USA

[4] Lawrence Livermore Natl Lab, Shock Phys Grp, Livermore, CA 94550 USA

[5] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[6] Howard Univ, Washington, DC 20059 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 06期

基金：

美国国家科学基金会;

关键词：

LIQUID-PHASE; MANTLE; MGSIO3; DIAGNOSTICS; STATE;

D O I：

10.1103/PhysRevLett.108.065701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Laser-driven shock compression experiments reveal the presence of a phase transition in MgSiO3 over the pressure-temperature range 300-400 GPa and 10 000-16 000 K, with a positive Clapeyron slope and a volume change of similar to 6.3 (+/- 2.0) percent. The observations are most readily interpreted as an abrupt liquid-liquid transition in a silicate composition representative of terrestrial planetary mantles, implying potentially significant consequences for the thermal-chemical evolution of extrasolar planetary interiors. In addition, the present results extend the Hugoniot equation of state of MgSiO3 single crystal and glass to 950 GPa.

引用

页数：4

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