First-Principles Study of Pressure-Induced Phase Transitions and Electronic Properties of Ag2MoO4
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Other documents of the author: Beltran, Armando; Gracia, Lourdes; Longo, Elson; Andres, Juan
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Title
First-Principles Study of Pressure-Induced Phase Transitions and Electronic Properties of Ag2MoO4Date
2014-01Publisher
American Chemical SocietyBibliographic citation
BELTRÁN, Armando, et al. First-Principles Study of Pressure-Induced Phase Transitions and Electronic Properties of Ag2MoO4. The Journal of Physical Chemistry C, 2014, 118.7: 3724-3732.Type
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/abs/10.1021/jp4118024Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
We have performed a systematic first-principles investigation by using the density functional formalism with the nonlocal B3LYP approximation to calculate structural and electronic properties as well as phase transitions ... [+]
We have performed a systematic first-principles investigation by using the density functional formalism with the nonlocal B3LYP approximation to calculate structural and electronic properties as well as phase transitions under pressure of silver molybdate, Ag2MoO4. Five phases have been considered: tetragonal Ag2MoO4 (with normal and inverse P4122 structures), β-Ag2MoO4 (cubic spinel structure), olivine-type (orthorhombic structure), and α-Ag2MoO4 (tetragonal K2NiF4-type structure). Numerical and analytical fittings have been conducted to determine the equilibrium unit cell geometry and equation-of-state parameters for all structures and compounds involved in the phase diagram. Pressure dependencies of band structures, energy gaps, density-of-states (DOS), and vibrational frequencies were investigated. Theoretical results show that the inverse Ag2MoO4 with P4122 symmetry is more stable above 15 GPa than the normal spinel structure, while the tetragonal structure is slightly more stable than the cubic representation above 6 GPa due to a tetragonal distortion. We determined the stability against decomposition of Ag2MoO4 toward binary oxides (MoO2, MoO3, Ag2O, AgO, and Ag2O3), metal (Ag and Mo), oxygen, and Ag2Mo2O7. Theoretical results point out that β-Ag2MoO4 can decompose into Ag2Mo2O7 and Ag2O at 12 GPa. [-]
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J. Phys. Chem. C, 2014, 118 (7)Rights
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