Evidence of low-symmetry phases in pressure-dependent Raman spectroscopic study of BaTiO3
In the earlier pressure-dependent Raman spectroscopic studies, it has been reported that BaTiO3 undergoes a tetragonal to cubic phase transition above ~ 2 GPa, whereas pressure-dependent X-ray absorption, X-ray diffuse scattering studies and pair distribution function studies have reported the presence of a low-symmetry rhombohedral phase above ~ 2.3 GPa. In this report, we present our pressure-dependent Raman spectroscopic studies on polycrystalline BaTiO3 which shows that it first undergoes a transition from tetragonal to orthorhombic/rhombohedral phase above ~ 2.6 GPa and then finally goes to the cubic phase above 8.4 GPa. Pressure-dependent synchrotron X-ray diffraction (SXRD) studies have also been carried out that provided rate of change of volume as a function of pressure resulting in bulk modulus of 215 ± 9 GPa.
Authors thank Dr. D.M. Phase and Mr. Gyanendra Panchal for FESEM measurements.
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Conflict of interest
Authors declare that no conflicts of interest exist.
- 14.Welsch A-M (2009) High-pressure Raman scattering of pure and doped PbSc0.5Ta0.5O3 and PbSc0.5Nb0.5O3 single crystals. Ph.D. thesis, University of HamburgGoogle Scholar