期刊
RARE METALS
卷 40, 期 5, 页码 1208-1218出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01656-2
关键词
Platinum intermetallic compounds; Elastic constants; Anisotropy; Debye temperature; First-principles
资金
- National Natural Science Foundation of China [51801179]
- Yunnan Science and Technology Projects [2019ZE001-1, 2018ZE001, 2018ZE021, 2018IC058]
- Yunnan Applied Basic Research Projects [2018FB083, 2018FD011]
In this study, the impacts of pressure on the structural, mechanical, thermodynamic, and electronic properties of Pt3M compounds were systematically investigated using first-principles density functional theory calculations. The results show that with increasing pressure, the mechanical and thermodynamic properties of these compounds change significantly.
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. Graphic abstract
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