Elastic properties and electronic structures of CrxBy as superhard compounds
The thermodynamic stability, electronic structures and anisotropic elastic properties of Cr-B binary compounds are extensively investigated by means of the first principle calculations using the CASTEP code.Formation enthalpy is calculated and used to estimate the stability of the CrxBy compounds.The elastic constants are obtained by the stress-strain method and the Voigt-Reuss-Hill approximation is applied to evaluate the polycrystalline elastic modulus.Meanwhile, all the compounds show different mechanical anisotropy because of the calculated anisotropic index and different shape of surface contour for bulk modulus and Young”s modulus.CrB4 exhibits the largest value of hardness, Young”s modulus and shear modulus among all the CrxBy compounds.The total density of states and partial density of states are analyzed in physical properties of CrxBy compounds.Moreover, the Debye temperature, anisotropy of acoustic velocities and heat capacity at lower temperature are evaluated and discussed by semi-empirical methods.
Ceramic Borides First-principle calculation Mechanical properties Anisotropy Electronic structures
XiaoYu Chong YeHua Jiang Rong Zhou Jing Feng
Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650 School of Engineering and Applied Science,Harvard University,Cambridge,MA 02138,USA
国内会议
苏州
英文
773-798
2014-10-26（万方平台首次上网日期，不代表论文的发表时间）