中国物理B ›› 2018, Vol. 27 ›› Issue (10): 107102-107102.doi: 10.1088/1674-1056/27/10/107102

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

First principles study of stability, mechanical, and electronic properties of chromium silicides

Bo Ren(任博), De-Hong Lu(卢德宏), Rong Zhou(周荣), De-Peng Ji(姬德朋), Ming-Yu Hu(胡明钰), Jing Feng(冯晶)   

  1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
  • 收稿日期:2018-05-17 修回日期:2018-07-03 出版日期:2018-10-05 发布日期:2018-10-05
  • 通讯作者: De-Hong Lu E-mail:ldhongkust@126.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 51265019).

First principles study of stability, mechanical, and electronic properties of chromium silicides

Bo Ren(任博), De-Hong Lu(卢德宏), Rong Zhou(周荣), De-Peng Ji(姬德朋), Ming-Yu Hu(胡明钰), Jing Feng(冯晶)   

  1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
  • Received:2018-05-17 Revised:2018-07-03 Online:2018-10-05 Published:2018-10-05
  • Contact: De-Hong Lu E-mail:ldhongkust@126.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 51265019).

摘要:

Through the first principles calculations, the chemical stability, mechanical, and electronic properties of chromium silicides are predicted. Estimating enthalpies and binding energies, density state density and electron density distribution are combined to analyse the thermodynamic stability and physical properties of chrome-silicon binary compounds. The chromium silicide includes Cr3Si, Cr5Si3, CrSi, and CrSi2. The chemical stability and the information about electronic structure, mechanical properties, Debye temperature, and anisotropy properties are obtained by density functional theory and Debye quasi-harmonic approximation. Meanwhile, the calculation of elastic modulus shows that Cr3Si has the highest body modulus value (251 GPa) and CrSi2 possesses the highest shear modulus (169.5 GPa) and Young's modulus (394.9 GPa). In addition, the Debye temperature and the speed of sound of these Cr-Si compounds are also calculated. Since the calculated bulk modulus is different from Young's modulus anisotropy index, and also different from Young's modulus of a three-dimensional surface shape, the different mechanical anisotropies of all the compounds are obtained.

关键词: density functional theory, electronic structures, mechanical properties, anisotropy

Abstract:

Through the first principles calculations, the chemical stability, mechanical, and electronic properties of chromium silicides are predicted. Estimating enthalpies and binding energies, density state density and electron density distribution are combined to analyse the thermodynamic stability and physical properties of chrome-silicon binary compounds. The chromium silicide includes Cr3Si, Cr5Si3, CrSi, and CrSi2. The chemical stability and the information about electronic structure, mechanical properties, Debye temperature, and anisotropy properties are obtained by density functional theory and Debye quasi-harmonic approximation. Meanwhile, the calculation of elastic modulus shows that Cr3Si has the highest body modulus value (251 GPa) and CrSi2 possesses the highest shear modulus (169.5 GPa) and Young's modulus (394.9 GPa). In addition, the Debye temperature and the speed of sound of these Cr-Si compounds are also calculated. Since the calculated bulk modulus is different from Young's modulus anisotropy index, and also different from Young's modulus of a three-dimensional surface shape, the different mechanical anisotropies of all the compounds are obtained.

Key words: density functional theory, electronic structures, mechanical properties, anisotropy

中图分类号:  (Density functional theory, local density approximation, gradient and other corrections)

  • 71.15.Mb
71.23.-k (Electronic structure of disordered solids) 62.20.-x (Mechanical properties of solids) 75.30.Gw (Magnetic anisotropy)