中国物理B ›› 2013, Vol. 22 ›› Issue (2): 26201-026201.doi: 10.1088/1674-1056/22/2/026201

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Pressure dependences of elastic and lattice dynamic properties of AlAs from ab initio calculations

李兴秀a, 陶小马a, 陈红梅a, 欧阳义芳a b, 杜勇b   

  1. a College of Physical Science and Technology, Guangxi University, Nanning 530004, China;
    b State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
  • 收稿日期:2012-05-13 修回日期:2012-09-07 出版日期:2013-01-01 发布日期:2013-01-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11047031); the Guangxi Natural Science Foundation, China (Grant No. 2011GXNSFC018003); and the Open Foundation of the Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, China (Grant No. GXKFJ09-16).

Pressure dependences of elastic and lattice dynamic properties of AlAs from ab initio calculations

Li Xing-Xiu (李兴秀)a, Tao Xiao-Ma (陶小马)a, Chen Hong-Mei (陈红梅)a, Ouyang Yi-Fang (欧阳义芳)a b, Du Yong (杜勇)b   

  1. a College of Physical Science and Technology, Guangxi University, Nanning 530004, China;
    b State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
  • Received:2012-05-13 Revised:2012-09-07 Online:2013-01-01 Published:2013-01-01
  • Contact: Ouyang Yi-Fang E-mail:ouyanggroup@gmail.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11047031); the Guangxi Natural Science Foundation, China (Grant No. 2011GXNSFC018003); and the Open Foundation of the Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, China (Grant No. GXKFJ09-16).

摘要: Ab initio calculations, based on norm-conserving nonlocal pseudopotentials and density functional theory (DFT), are performed to investigate the structural, elastic, dielectric, and vibrational properties of aluminum arsenide AlAs with zinc-blende (B3) structure and nickel arsenide (B81) structure under hydrostatic pressure. Firstly, the path for the phase transition from B3 to B81 is confirmed by analyzing the energies of different structures, which is in good agreement with previous theoretical results. Secondly, we find that the elastic constants, bulk modulus, static dielectric constants, and the optical phonon frequencies are varying in a nearly linear manner under hydrostatic pressure. What is more, the softening mode of transversal acoustic mode at X point supports the phase transition in AlAs.

关键词: mechanical properties, lattice dynamic properties, dielectric properties

Abstract: Ab initio calculations, based on norm-conserving nonlocal pseudopotentials and density functional theory (DFT), are performed to investigate the structural, elastic, dielectric, and vibrational properties of aluminum arsenide AlAs with zinc-blende (B3) structure and nickel arsenide (B81) structure under hydrostatic pressure. Firstly, the path for the phase transition from B3 to B81 is confirmed by analyzing the energies of different structures, which is in good agreement with previous theoretical results. Secondly, we find that the elastic constants, bulk modulus, static dielectric constants, and the optical phonon frequencies are varying in a nearly linear manner under hydrostatic pressure. What is more, the softening mode of transversal acoustic mode at X point supports the phase transition in AlAs.

Key words: mechanical properties, lattice dynamic properties, dielectric properties

中图分类号:  (Elastic moduli)

  • 62.20.de
63.20.D- (Phonon states and bands, normal modes, and phonon dispersion) 77.22.-d (Dielectric properties of solids and liquids)