Abstract
In this work, the impacts of pressure on the structural, mechanical, thermodynamic and electronic properties of typical Pt3M (M = Al, Co, Hf, Sc, Y, Zr) compounds were investigated systematically by the first-principles density function theory calculations. The calculated lattice parameters, volume and elastic constants of Pt3M compounds are in good agreement with available experimental and calculation values. With the increase in pressure, the lattice parameters and volume of Pt3M compounds decrease, while the elastic constants, bulk modulus, shear modulus and Young’s modulus increase. The variations in Pugh’s ratio and Poisson’s ratio indicate that these Pt3M compounds are mechanically stable and ductile. The mechanical anisotropy of these Pt3M compounds is enhanced by rising pressure. Thermodynamic analysis indicates that sound velocity and Debye temperature increase with the increase in stress. The charge distribution does not change obviously, implying that no phase transition occurs in the range of 0–100 GPa.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (No. 51801179), Yunnan Science and Technology Projects (Nos. 2019ZE001-1, 2018ZE001, 2018ZE021 and 2018IC058) and Yunnan Applied Basic Research Projects (Nos. 2018FB083 and 2018FD011).
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Li, ZB., Xiong, K., Jin, CC. et al. Structural, mechanical, thermodynamic and electronic properties of Pt3M (M = Al, Co, Hf, Sc, Y, Zr) compounds under high pressure. Rare Met. 40, 1208–1218 (2021). https://doi.org/10.1007/s12598-020-01656-2
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DOI: https://doi.org/10.1007/s12598-020-01656-2