First-principles Calculations on the Stability and Mechanical Properties of NaCl-type Transition Metal Carbides
WEN Xiping1, TANG Shuai1, PENG Qing2, ZHANG Xianfa1, LI Linxian1, LIU Zhenyu1, WANG Guodong1
1 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China 2 Department of Physics, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
Abstract: Based on the first-principles calculation within the frame of density functional theory, the stability of the structure, mechanics and dynamics of six types of NaCl-type transition metal carbides MC (M=Ti, Zr, V, Nb, Cr, Mo) were calculated. The NaCl cubic structure of MC was optimized, and the formation and binding energies of different carbides were calculated. The result shows that ZrC has the highest stability while MoC has the lowest stability. The mechanical properties of transition metal carbides, such as elastic constant, elastic modulus, hardness, brittleness and toughness, were comparatively studied, and the results show that all the six carbides are mechanically stable. The phonon spectrum of MoC has an imaginary frequency, indicating that MoC is dynamically instable in rocksalt struture. The electronic properties and bonding behavior of MC were discussed through differential charge density map and bader charge analysis. The calculation results in this paper are consistent with the experimental and previous theoretical calculation results.
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