Evidence of low-symmetry phases in pressure-dependent Raman spectroscopic study of BaTiO.sub.3

In the earlier pressure-dependent Raman spectroscopic studies, it has been reported that BaTiO.sub.3 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...

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Bibliographic Details
Published in:Journal of materials science 2018-05, Vol.53 (10), p.7224
Main Authors: Tyagi, Shekhar, Sathe, V. G, Sharma, Gaurav, Srihari, Velaga, Poswal, Himanshu Kumar
Format: Article
Language:English
Subjects:
Analysis
Probability distributions
X-ray diffraction
Online Access:Get full text
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Summary:In the earlier pressure-dependent Raman spectroscopic studies, it has been reported that BaTiO.sub.3 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 BaTiO.sub.3 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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-018-2102-1