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Structural, mechanical, and thermodynamic properties of R-3m ReB4 under high pressure

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  • Jian-Li Ma

    (School of Mechanics and Optoelectronic physics, Anhui University of Science and Technology)

  • Yi-Long Wu

    (School of Mechanics and Optoelectronic physics, Anhui University of Science and Technology)

  • Zhi-Fen Fu

    (School of Mechanics and Optoelectronic physics, Anhui University of Science and Technology)

  • Qun Wei

    (School of Physics and Optoelectronic Engineering, Xidian University)

  • Zhang-Fu Yang

    (School of Mechanics and Optoelectronic physics, Anhui University of Science and Technology)

  • Juan Gao

    (School of Mechanics and Optoelectronic physics, Anhui University of Science and Technology)

  • Jian-Ping Zhou

    (School of Physics and Information Technology, Shaanxi Normal University)

Abstract

The structural, mechanical, and thermodynamic properties of R-3m ReB4 under high pressure were investigated by using the density functional theory in combination with the quasi-harmonic Debye model in this work. The calculated structure parameters and bulk moduli of R-3m ReB4 at zero pressure are in good agreement with previous theoretical data. The calculated single crystal elastic constants and phonon spectra revealed that R-3m ReB4 is mechanically and dynamically stable at least 100 GPa. The pressure dependence of elastic constants and elastic modulus (B, G, and E) have been determined. Based on the obtained elastic modulus, two theoretical models were used to predict the Vickers hardness of R-3m ReB4. Furthermore, through plotting the directional dependent of bulk moduli, Young’s moduli, and shear moduli, the elastic anisotropy has been investigated in detail. Moreover, using the quasi-harmonic Debye model, some basic thermodynamical quantities such as the heat capacity, Grüneisen parameter, and the thermal expansion coefficients of R-3m ReB4 were explored under high temperature and high pressure. The obtained results can provide valuable reference for future synthesis and application R-3m ReB4 material. Graphical abstract

Suggested Citation

  • Jian-Li Ma & Yi-Long Wu & Zhi-Fen Fu & Qun Wei & Zhang-Fu Yang & Juan Gao & Jian-Ping Zhou, 2019. "Structural, mechanical, and thermodynamic properties of R-3m ReB4 under high pressure," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 92(9), pages 1-9, September.
    • Handle: RePEc:spr:eurphb:v:92:y:2019:i:9:d:10.1140_epjb_e2019-100331-7
    DOI: 10.1140/epjb/e2019-100331-7
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    Keywords

    Solid State and Materials;

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