Journal
LOW TEMPERATURE PHYSICS
Volume 46, Issue 12, Pages 1185-1195Publisher
AMER INST PHYSICS
DOI: 10.1063/10.0002472
Keywords
BaTiO3; SrTiO3; oxygen vacancy; DFT hybrid calculations; infrared spectra; Raman spectra
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Funding
- [LV-UA/2018/2]
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The first-principles (ab initio) computations of the structural, electronic, and phonon properties have been performed for cubic and low-temperature tetragonal phases of BaTiO3 and SrTiO3 perovskite crystals, both stoichiometric and non-stoichiometric (with neutral oxygen vacancies). Calculations were performed with the CRYSTAL17 computer code within the linear combination of atomic orbitals approximation, using the B1WC advanced hybrid exchange-correlation functional of the density-functional-theory (DFT) and the periodic supercell approach. Various possible spin states of the defective systems were considered by means of unrestricted (open shell) DFT calculations. It was demonstrated that oxygen reduction leads to the appearance of new local vibrational modes associated with oxygen vacancies and new first-order peaks in the Raman spectra, which could be used for defect identification. The calculated Raman spectra for different vacancy positions and spins of the system, as well as other properties of defective crystals, are compared with the relevant experimental data.
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