中国物理B ›› 2018, Vol. 27 ›› Issue (12): 126201-126201.doi: 10.1088/1674-1056/27/12/126201

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

First-principles investigations on structural stability, mechanical, and thermodynamic properties of LaT2Al20 (T=Ti, V, Cr, Nb, and Ta) intermetallic cage compounds

Shanyu Quan(权善玉), Xudong Zhang(张旭东), Cong Liu(刘聪), Wei Jiang(姜伟)   

  1. 1 School of Science, Shenyang University of Technology, Shenyang 110870, China;
    2 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
  • 收稿日期:2018-08-15 修回日期:2018-10-09 出版日期:2018-12-05 发布日期:2018-12-05
  • 通讯作者: Xudong Zhang E-mail:zxdwfc@163.com
  • 基金资助:

    Project supported by the Program for Ph. D Start-up Fund of Liaoning Province of China (Grant No. 201601161).

First-principles investigations on structural stability, mechanical, and thermodynamic properties of LaT2Al20 (T=Ti, V, Cr, Nb, and Ta) intermetallic cage compounds

Shanyu Quan(权善玉)1, Xudong Zhang(张旭东)1, Cong Liu(刘聪)1, Wei Jiang(姜伟)1,2   

  1. 1 School of Science, Shenyang University of Technology, Shenyang 110870, China;
    2 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
  • Received:2018-08-15 Revised:2018-10-09 Online:2018-12-05 Published:2018-12-05
  • Contact: Xudong Zhang E-mail:zxdwfc@163.com
  • Supported by:

    Project supported by the Program for Ph. D Start-up Fund of Liaoning Province of China (Grant No. 201601161).

摘要:

First principles calculations were used to explore the structural stability, mechanical properties, and thermodynamic properties of LaT2Al20 (T=Ti, V, Cr, Nb, and Ta) intermetallics. The calculated formation enthalpy and phonon frequencies indicate that LaT2Al20 intermetallics exhibit the structural stability. The elastic moduli (B, G, E, and Hv) indicate that these intermetallics possess the better elastic properties than pure Al. The values of Poisson's ratio v and B/G demonstrate that LaT2Al20 intermetallics are all brittle materials. The anisotropy of elasticity and Young's modulus (three- and two-dimensional figures) indicate that LaT2Al20 compounds are anisotropic. Importantly, the calculated thermal quantities demonstrate that LaT2Al20 intermetallics possess the better thermal physical properties than pure Al at high temperatures.

关键词: LaT2Al20 intermetallics, mechanical properties, anisotropic properties, dynamical and thermodynamic properties, first-principles calculations

Abstract:

First principles calculations were used to explore the structural stability, mechanical properties, and thermodynamic properties of LaT2Al20 (T=Ti, V, Cr, Nb, and Ta) intermetallics. The calculated formation enthalpy and phonon frequencies indicate that LaT2Al20 intermetallics exhibit the structural stability. The elastic moduli (B, G, E, and Hv) indicate that these intermetallics possess the better elastic properties than pure Al. The values of Poisson's ratio v and B/G demonstrate that LaT2Al20 intermetallics are all brittle materials. The anisotropy of elasticity and Young's modulus (three- and two-dimensional figures) indicate that LaT2Al20 compounds are anisotropic. Importantly, the calculated thermal quantities demonstrate that LaT2Al20 intermetallics possess the better thermal physical properties than pure Al at high temperatures.

Key words: LaT2Al20 intermetallics, mechanical properties, anisotropic properties, dynamical and thermodynamic properties, first-principles calculations

中图分类号:  (Mechanical properties of solids)

  • 62.20.-x
61.90.+d (Other topics in structure of solids and liquids; crystallography) 62.20.D- (Elasticity)