High-pressure Raman spectroscopy study of α and γ polymorphs of AlH3

被引：22

作者：

Tkacz, Marek ^{[1
]}

Palasyuk, Taras ^{[1
]}

Graetz, Jason ^{[2
]}

Saxena, Surendra ^{[3
]}

机构：

[1] Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland

[2] Brookhaven Natl Lab, Dept Energy Sci & Technol, Upton, NY 11973 USA

[3] Florida Int Univ, CeSMEC, Miami, FL 33199 USA

来源：

JOURNAL OF RAMAN SPECTROSCOPY | 2008年 / 39卷 / 07期

关键词：

aluminum hydride (alane); high pressure; Raman effect; phase transition;

D O I：

10.1002/jrs.1936

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

For the first time, Raman spectroscopy of ct and y polymorphs of AlH3 has been performed in the pressure range from ambient up to 16.9 and 32.7 GPa, respectively using the diamond anvil cell (DAC) technique. An analysis of pressure response wavenumbers M for a-AIH3 showed a change of dv(i)/dP at a pressure of about 8 GPa and may indicate a monoclinic distortion from the initially hexagonal alpha-AlH3. The distortion is stable at least up to 16.9 GPa. The y form exhibited more complex behavior transforming to the a form at a pressure of about 12 GPa. The structural phase transition was shown to be an irreversible and kinetically slow process that required at least 5 h to complete. Copyright (c) 2008 John Wiley & Sons, Ltd.

引用

页码：922 / 927

页数：6

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