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- W2016390499 abstract "We present an ab initio calculation of lattice dynamics and thermodynamic properties of SrO in the NaCl (B1) and CsCl (B2) structured phases under pressure. We employ the density-functional perturbation theory (DFPT) within the local density approximation (LDA) in conjunction with the quasi-harmonic approximation. At zero pressure, the calculated dispersions agree well with the measured ones for the B1 phase. A pressure-induced soft transverse acoustic (TA) phonon mode is identified at the zone boundary X point of the Brillouin zone. The B2 phase is stable at high pressure. Our analysis suggest that this soft transverse mode is responsible for the pressure induced structural phase transition. The increase of the electronic dielectric function with pressure is attributed to the closure of the p–d gaps. The thermal expansion coefficient decreases with pressure and does not show any negative behavior. The predicted transition pressure decreases with temperature." @default.
- W2016390499 created "2016-06-24" @default.
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- W2016390499 date "2012-01-01" @default.
- W2016390499 modified "2023-09-24" @default.
- W2016390499 title "Ab initio lattice dynamics and thermodynamic properties of SrO under pressure" @default.
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- W2016390499 doi "https://doi.org/10.1016/j.jpcs.2011.10.023" @default.
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