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Theoretical Study of Mechanical Stability and Physical Properties of Co2V1−xZrxGa

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Abstract

The mechanical stability and physical properties of Co2V1−xZrxGa (x = 0, 0.25, 0.50, 0.75, 1) have been predicted by using ab initio calculations based on density functional theory. The exchange-correlation potentials are treated within the generalized gradient approximation-Perdew-Burke and Ernzerhhof (GGA-PBE) and Hubbard coefficient (GGA+U). The investigated minimum lattice parameter of Co2VGa is 5.8030 Å, which is in excellent agreement with available experimental and theoretical data and for Co2V1−xZrxGa (x = 0.25, 0.50, 0.75, 1) are 5.9026, 5.9625, 6.0060 and 6.0021 Å, respectively, which are predicted for the very first time. The total magnetic moments decrease with increasing concentration of x in Co2V1−xZrxGa, in agreement with the Slater-Pauling rule. Band structure and density of states calculations show that the minority spin channel exhibits band gaps of 0.43, 0.46, 0.52, 0.54 and 1.01 eV for GGA+U scheme around the Fermi level confirming that all the studied composites are half-metallic in nature. In this study, we also studied the elastic constant and it is established that all the materials are mechanically stable and ductile in nature. The Co2VGa is stiffer than other materials and all the studied composites have anisotropic behaviour. Moreover, by using a quasi-harmonic Debye model and calculated elastic constant, the Debye temperature and temperature-dependent constant volume heat capacity have been investigated.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (grant no. 51401099).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Ramesh Paudel & Jingchuan Zhu

  2. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150080, China

    Jingchuan Zhu

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Correspondence to Ramesh Paudel.

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Paudel, R., Zhu, J. Theoretical Study of Mechanical Stability and Physical Properties of Co2V1−xZrxGa. J Supercond Nov Magn 32, 1261–1269 (2019). https://doi.org/10.1007/s10948-018-4773-x

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