Pressure-induced metallization of silane

被引：136

作者：

Chen, Xiao-Jia ^{[1
,2
]}

Struzhkin, Viktor V. ^{[1
]}

Song, Yang ^{[1
,3
]}

Goncharov, Alexander F. ^{[1
]}

Ahart, Muhtar ^{[1
]}

Liu, Zhenxian ^{[1
]}

Mao, Ho-kwang ^{[1
]}

Hemley, Russell J. ^{[1
]}

机构：

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

[2] S China Univ Technol, Sch Phys, Guangzhou 510641, Peoples R China

[3] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2008年 / 105卷 / 01期

基金：

美国国家科学基金会;

关键词：

high pressure; hydrogen-rich materials;

D O I：

10.1073/pnas.0710473105

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

There is a great interest in electronic transitions in hydrogen-rich materials under extreme conditions. It has been recently suggested that the group IVa hydrides such as methane (CH4), silane (SiH4), and germane (GeH4) become metallic at far lower pressures than pure hydrogen at equivalent densities because the hydrogen is chemically compressed in group IVa hydride compounds. Here we report measurements of Raman and infrared spectra of silane under pressure. We find that SiH4 undergoes three phase transitions before becoming opaque at 27-30 GPa. The vibrational spectra indicate the material transforms to a polymeric (framework) structure in this higher pressure range. Room-temperature infrared reflectivity data reveal that the material exhibits Drude-like metallic behavior above 60 GlPa, indicating the onset of pressure-induced metallization.

引用

页码：20 / 23

页数：4

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