期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 137, 期 1, 页码 282-289出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2012.09.022
关键词
Oxides; Ab initio calculations; Lattice dynamics; Phase transitions
资金
- Ministry of New and Renewable (MNRE)
- Department of Science and Technology (DST), New Delhi, India
Using the plane-wave pseudopotential technique based on the first-principles density functional perturbation theory (DFPT), we have studied the vibrational properties and Raman susceptibility tensor at ambient and high pressure of rutile phase of TiO2. Full phonon dispersion curves and phonon densities of states with projected phonon density of states and Raman tensors at high pressures are calculated and given. It is found that rutile TiO2 shows a pressure induced phase transition, especially when lattice dynamical instabilities are involved, like the soft phonon modes, at a hydrostatic pressure lower than 10 GPa. An analyses of the vibrational displacements is given. The possibility to use Raman line intensities as an additional tool in the study of phase transitions is also discussed. (C) 2012 Elsevier B.V. All rights reserved.
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