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JOURNAL OF SYNTHETIC CRYSTALS ›› 2021, Vol. 50 ›› Issue (12): 2255-2261.

• Research Articles • Previous Articles     Next Articles

Structural Characteristic and Elastic Property of ReB2 under High Pressure

ZHANG Lihong, LEI Huiru   

  1. Department of Basic Subjects Teaching, Shanxi Institute of Technology, Yangquan 045000, China
  • Received:2021-08-16 Online:2021-12-15 Published:2022-01-06

Abstract: The structural characteristic and elastic property of ReB2 in P63/mmc structure (hP6-ReB2) were computed using the pseudopotential plane-wave methods based on the density functional theory. The equilibrium structural parameters of hP6-ReB2 were calculated and its stability was verified thermodynamically, dynamically, and mechanically. It is found that the elastic constants, aggregate moduli increase as the pressure increases, and the Poisson ratio σ of hP6-ReB2structure shows its brittleness, and the elastic waves reveals its elastic anisotropy. In addition, the obtained Vickers hardness of hP6-ReB2 is 38.2 GPa. The density of electronic states reveals that there is a strong covalent bond between Re-B and B-B of hP6-ReB2, and the covalent bond increases gradually with the increase of pressure.

Key words: high hardness material, ReB2, high pressure, structural characteristic, elastic property, hardness, density of state

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