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First-principles study of the structural phase transition, elastic and thermodynamic properties of HfCr2

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Abstract

We study the structural phase transition, elastic and thermodynamic properties of HfCr2 from first-principles calculations. The simulated results are very close to those of previous studies. The phase transition from C15 to C36 occurs at about 202.7 GPa, while the phase transition pressure from C36 to C14 is about 283.9 GPa. It can be seen from the phonon spectra and elastic constants that HfCr2 is mechanically stable at C15 phase. It can be concluded that C15 phase HfCr2 is ductile from 0 to 200 GPa, and the bigger the pressure, the greater the ductility from G/B value and Poisson’s ratio. Then, through the analysis of density of states, the mechanism of metal properties is discussed. Finally, the relation of thermal expansion coefficient, Debye temperature and thermal capacity to pressure and temperature is discussed.

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The structural phase transition and thermodynamic properties of HfCr2

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Data availability

This manuscript has associated data in a data repository. [Authors' comment: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.].

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Department of Public Order, Sichuan Police College, 186 Longtouguan Road, Jiangyang District, Luzhou, 642400, Sichuan, China

    Hong-Jie Bai & Xiao-Rong Qin

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  1. Hong-Jie Bai
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  2. Xiao-Rong Qin
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Contributions

H-JB obtained the data and wrote the paper. X-RQ drew the data graph and revised the paper.

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Correspondence to Hong-Jie Bai.

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Bai, HJ., Qin, XR. First-principles study of the structural phase transition, elastic and thermodynamic properties of HfCr2. Eur. Phys. J. B 96, 61 (2023). https://doi.org/10.1140/epjb/s10051-023-00525-y

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