Pressure-induced structural sequence in silicon:: Diamond to β-tin to Imma -: art. no. 205201

被引：20
|
作者：
Hebbache, M
Mattesini, M
Szeftel, J
机构：
[1] Univ Paris 07, Lab Phys Theor Mat Condensee, F-75251 Paris 05, France
[2] Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France
来源：
PHYSICAL REVIEW B | 2001年 / 63卷 / 20期
关键词：
D O I：
10.1103/PhysRevB.63.205201
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We propose a theoretical approach based on the Landau scheme for studying the phase diagram of nonhydrostatically stressed silicon. It is shown that the first two pressure-induced phase transitions, namely the diamond-cubic to the body-centered tetragonal (beta -tin) phase transition and the beta -tin to orthorhombic (Imma) phase transition, are elastic, i.e., the soft mode is an acoustic mode and the order parameters are deformations of unit cells. The effect of an external stress on these phase transitions is also investigated. The model is tested on the experimental structural studies available in the literature.
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页数：6
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