X-ray diffraction studies and equation of state of methane at 202 GPa

被引：43

作者：

Sun, Liling ^{[1
,2
,3
]}

Yi, Wei ^{[2
,3
]}

Wang, Lin ^{[4
]}

Shu, Jinfu ^{[1
]}

Sinogeikin, Stas ^{[4
]}

Meng, Yue ^{[4
]}

Shen, Guoyin ^{[4
]}

Bai, Ligang ^{[5
]}

Li, Yanchuan ^{[5
]}

Liu, Jing ^{[5
]}

Mao, Ho-kwang ^{[1
,4
]}

Mao, Wendy L. ^{[6
,7
]}

机构：

[1] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA

[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[4] Argonne Natl Lab, Adv Photon Source, High Pressure Collaborat Access Team, Argonne, IL 60439 USA

[5] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China

[6] Stanford Univ, Dept Geog & Environm Sci, Stanford, CA 94305 USA

[7] Natl Accelerator Ctr, SLAC, Photon Sci Dept, Menlo Pk, CA 94025 USA

来源：

CHEMICAL PHYSICS LETTERS | 2009年 / 473卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

HIGH-PRESSURE; SOLID METHANE; ROOM-TEMPERATURE; GIANT PLANETS; VOYAGER-2; INTERIORS; CRYSTAL;

D O I：

10.1016/j.cplett.2009.03.072

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Solid methane (CH(4)) was compressed up to 202 GPa at 300 K in a diamond-anvil cell. The crystal structure and equation of state over this entire range were determined from angle dispersive X-ray diffraction results. CH(4) undergoes phase transitions from rhombohedral to a simple cubic phase at 19 GPa and from simple cubic to a higher pressure cubic phase at approximately 94 GPa. This higher pressure cubic phase was stable to the maximum pressure investigated. Combined with previous optical measurements, it was found that at room temperature compressed CH(4) remains an insulator with cubic structure to 202 GPa. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：72 / 74

页数：3

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