Quantum effects on the elastic properties of cubic boron nitride by path-integral Monte Carlo simulation
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2022
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Using path-integral Monte Carlo simulation, we study the quantum effects on the elastic properties of cubic
boron nitride (c-BN) crystal in a wide temperature range from 40 to 2000 K and a pressure range varying
from 1 atm to 160 GPa. The Tersoff–Albe potential is employed to describe the interatomic interactions, and
the elastic constants are determined by a direct method derived from the stress–strain curves. The calculations
show that elastic constants 𝐶11, 𝐶12, and 𝐶44 are temperature and pressure dependent, and their values are in
satisfactory agreement with available experimental results at room temperature. Furthermore, we estimate the
Poisson ratio, anisotropic factor, longitudinal-wave elastic constant, Cauchy pressure, and Pugh’s ratio and their
temperature and pressure dependence. In general, the quantum effect contributions to the elastic properties of
the c-BN are extracted quantitatively from the differences between the path-integral and classical Monte Carlo
simulation results. The quantum contribution is negligible at high temperatures but can be significant at low
temperatures. It is responsible for variations of about 5 ∼ 7% of the elastic constants 𝐶11 and 𝐶44, and 𝐶12.
The impacts of quantum contribution on the elastic properties of the c-BN crystal are similar to those found
in the diamond.
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Cubic boron nitride, Elastic properties, Many-body quantum effects, Quantum Monte Carlo simulation
Citação
BRITO, B. G. A.; G.-Q., Hai; CÂNDIDO, L. Quantum effects on the elastic properties of cubic boron nitride by path-integral Monte Carlo simulation. Computational Condensed Matter, Amsterdam, v. 33, e00759, 2022. DOI: 10.1016/j.cocom.2022.e00759. Disponível em: https://www.sciencedirect.com/science/article/pii/S2352214322001083. Acesso em: 23 jan. 2024.