中国物理B ›› 2010, Vol. 19 ›› Issue (1): 16201-016201.doi: 10.1088/1674-1056/19/1/016201

• • 上一篇    下一篇

Prediction of a superhard material of ReN4 with a high shear modulus

赵文杰, 许红斌, 王渊旭   

  1. Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, China
  • 收稿日期:2009-04-02 修回日期:2009-05-05 出版日期:2010-01-15 发布日期:2010-01-15
  • 基金资助:
    Project supported by the Program for Science and Technology Innovation Talents in Universities of Henan Province, China (Grant No. 2009HASTIT003), the Foundation of Science and Technology Department of Henan Province, China (Grant No. 082300410010), and Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China.

Prediction of a superhard material of ReN4 with a high shear modulus

Zhao Wen-Jie(赵文杰), Xu Hong-Bin(许红斌), and Wang Yuan-Xu(王渊旭)   

  1. Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, China
  • Received:2009-04-02 Revised:2009-05-05 Online:2010-01-15 Published:2010-01-15
  • Supported by:
    Project supported by the Program for Science and Technology Innovation Talents in Universities of Henan Province, China (Grant No. 2009HASTIT003), the Foundation of Science and Technology Department of Henan Province, China (Grant No. 082300410010), and Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China.

摘要: Using first-principles calculations, this paper systematically investigates the structural, elastic, and electronic properties of ReN4. The calculated positive eigenvalues of the elastic constant matrix show that the orthorhombic Pbca structure of ReN4 is elastically stable. The calculated band structure indicates that ReN4 is metallic. Compared with the synthesized superhard material WB4, it finds that ReN4 exhibits larger bulk and shear moduli as well as a smaller Poisson's ratio. In addition, the elastic constant c_44 of ReN4 is larger than all the known 5d transition metal nitrides and borides. This combination of properties makes it an ideal candidate for a superhard material.

Abstract: Using first-principles calculations, this paper systematically investigates the structural, elastic, and electronic properties of ReN4. The calculated positive eigenvalues of the elastic constant matrix show that the orthorhombic Pbca structure of ReN4 is elastically stable. The calculated band structure indicates that ReN4 is metallic. Compared with the synthesized superhard material WB4, it finds that ReN4 exhibits larger bulk and shear moduli as well as a smaller Poisson's ratio. In addition, the elastic constant $c_{44}$ of ReN4 is larger than all the known 5d transition metal nitrides and borides. This combination of properties makes it an ideal candidate for a superhard material.

Key words: bulk modulus, shear modulus, hardness, elastic properties

中图分类号:  (Inorganic compounds)

  • 61.66.Fn
62.20.D- (Elasticity) 71.15.Mb (Density functional theory, local density approximation, gradient and other corrections) 71.20.Ps (Other inorganic compounds) 81.40.Jj (Elasticity and anelasticity, stress-strain relations)