First-principles investigations on structural, electronic and elastic properties of BeSe under high pressure

被引：12

作者：

Yu, Yang ^{[1
]}

Liu, Daijun ^{[1
]}

Chen, Jianjun ^{[1
]}

Ji, Junyi ^{[1
]}

Long, Jianping ^{[2
]}

机构：

[1] Sichuan Univ, Coll Chem Engn, Chengdu 610065, Peoples R China

[2] Chengdu Univ Technol, Coll Mat & Chem & Chem Engn, Chengdu 610059, Peoples R China

来源：

SOLID STATE SCIENCES | 2014年 / 28卷

基金：

中国国家自然科学基金;

关键词：

First-principles; Electronic properties; Elastic properties; Phase transition; BeSe; BERYLLIUM CHALCOGENIDES BES; GROUND-STATE PROPERTIES; OPTICAL-PROPERTIES; AB-INITIO; BETE; CONSTANTS; PHASE; TRANSITION; CRYSTALS;

D O I：

10.1016/j.solidstatesciences.2013.12.009

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The structural, electronic and elastic properties of BeSe in both B3 and B8 structures have been studied by first-principles calculations within the generalized gradient approximation (GGA). The calculated lattice parameters and bulk modulus of BeSe are in reasonable agreement with previous results. The predicted value of phase transition pressure from B3 to B8 is 50.24 GPa, which is well in line with the experimental data (56 +/- 5 GPa). The calculation of the electronic band structure shows that the energy gap is indirect for B3 and B8 phases. Especially, the elastic constants of B8 BeSe under high pressure were studied for the first time. The bulk modulus, shear modulus, compressional and shear wave velocities of B8 BeSe evaluated from elastic constants as a function of pressure were investigated. In addition, Poisson's radio, elastic anisotropy and Debye temperature were analyzed successfully. (C) 2013 Elsevier Masson SAS. All rights reserved.

引用

页码：35 / 40

页数：6

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