Abstract
The full set of the independent second- and third-order elastic constants of \(\hbox {Cu}_{2}\hbox {MnAl}\) and \(\hbox {Cu}_{2}\hbox {MnIn}\) Heusler compounds have been obtained from the strain energy of the lattice by the first-principles calculations in combination with the homogeneous deformation theory. The ground-state lattice parameters and second-order elastic constants are found to be consistent with the available theoretical and experimental results. Among all the negative third-order elastic constants, the longitudinal modes \(C_{111}\) have larger values than their shear modes, showing that the contribution to lattice vibrations from the longitudinal modes is greater. The ductility, elastic anisotropy, melting point and Debye temperature of the two compounds under different pressures are investigated for the first time, and increase with increasing the pressure.
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Xianshi Zeng, Ping Ou and Yuanxiu Ye carried out the theoretical calculations; Lili Liu, Qingdong Gou and Yufeng Wen analyzed the data; Lili Liu wrote the paper.
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Liu, L., Zeng, X., Gou, Q. et al. The Structural Stability and Mechanical Properties of \(\hbox {Cu}_{2}\hbox {MnAl}\) and \(\hbox {Cu}_{2}\hbox {MnIn}\) Under Pressure: First-Principles Study. J. Electron. Mater. 47, 3005–3017 (2018). https://doi.org/10.1007/s11664-018-6163-3
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DOI: https://doi.org/10.1007/s11664-018-6163-3