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First-principles study of pressure-induced phase transitions, mechanical and thermodynamic properties of ThBC
Jiacheng Sun1, Zhiguang Liao1, Yue Zhang1
1School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China.
Abstract:
First-principles calculations and particle swarm optimization algorithm are combined to predict the crystal structures in the pressure range from 0 to 100 GPa. Four phases of ThBC are determined, including theP4122,Cmcm,CmceandImmmphases, in which theCmcm,CmceandImmmphases are newly predicted structures. The mechanical, electronic and thermodynamic properties of the four phases are investigated. According to the enthalpy-pressure and volume-pressure curves, the phase transition pressure from theP4122 phase to theCmcmphase is 15 GPa, theCmcmto theCmceis 36 GPa and theCmceto theImmmis 69 GPa. All the transitions belong to the first-order phase transition. Based on the calculated elastic constants, theP4122,Cmcm,CmceandImmmphases exhibit brittle nature. The Young's moduli show that theP4122 phase has the largest degree of anisotropy, and theImmmphase has the smallest. The calculated density of states reveal that theP4122,Cmcm,CmceandImmmphases are all metallic.
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