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• W3100699159 abstract "Beta-PtO2 is a useful transition metal dioxide, but its fundamental thermodynamic and elastic properties remain unexplored. Using first-principles calculations, we systematically studied the structure, phonon, thermodynamic and elastic properties of beta-PtO2. The lattice dynamics and structural stability of beta-PtO2 under pressure were studied using the phonon spectra and vibrational density of states. The vibrational frequencies of the optical modes of beta-PtO2 increase with elevating pressure; this result is comparable with the available experimental data. Then, the heat capacities and their pressure responses were determined based on the phonon calculations. The pressure dependence of the Debye temperature was studied, and the results are compared in two distinct aspects. The elastic moduli of beta-PtO2 were estimated through the Voigt-Reuss-Hill approximation. The bulk modulus of beta-PtO2 increases linearly with pressure, but the shear modulus is nearly independent of pressure. Our study revealed that the elastic stiffness coefficients C44, C55 and C66 play a primary role in the slow variation of the shear modulus." @default.
• W3100699159 created "2020-11-23" @default.
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• W3100699159 date "2019-05-22" @default.
• W3100699159 modified "2023-10-12" @default.
• W3100699159 title "β-PtO2: Phononic, thermodynamic, and elastic properties derived from first-principles calculations" @default.
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• W3100699159 doi "https://doi.org/10.1007/s11467-019-0900-9" @default.
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