Abstract
The structural, electronic, mechanical and optical properties of LaIn3 under pressure have been systemically investigated using the first-principles calculations based on density functional theory (DFT). Structural calculations show that the cubic LaIn3 is no structural phase transition in the pressure range of 0–30 GPa. From the calculated electronic band structures and density of states (DOS), it is found that the LaIn3 is metallic character and the bands which cross EF originate primarily from La-d states, with some contribution from In-p states. The electrical conductivity and metal properties are gradually decreasing with increasing pressure, and the electron transition becomes more difficult. The calculated elastic properties indicate that LaIn3 is mechanical stability and possess the superior mechanical properties in the considered pressure ranges. Moreover, a comparison of the two elastic constants C11 and C44 indicates that the LaIn3 is more resistant to the unidirectional compression than to the shear deformation, and the values of Poisson’s ratio ν and B/G demonstrate that LaIn3 is keep ductile behavior under pressure up to 30 GPa. In addition, the elastic anisotropy of LaIn3 under pressure is also examined. Finally, the optical properties and Debye temperature of the cubic LaIn3 under pressure are also predicted analytically.
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Funding
This work was supported by the National Natural Science Foundation of China (grant nos. 11304211 and 11504304), the Construction Plan for Scientific research Innovation Team of Universities in Sichuan Province (project no. 12TD008), the Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials (grant no. 15zxfk08).
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Yulu Wan, Cheng, C., He, X. et al. Structural, Electronic, Mechanical, and Optical Properties of LaIn3 under Pressure: A First Principle Investigation. J. Superhard Mater. 43, 31–44 (2021). https://doi.org/10.3103/S1063457621010068
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DOI: https://doi.org/10.3103/S1063457621010068