Probing the effect of ferroelectric to paraelectric phase transition on the Ti-3d and O-2p hybridization in BaTiO3

We report the modifications in the electronic properties of single phase polycrystalline BaTiO3 due to ferroelectric to paraelectric phase transition revealed by temperature dependent synchrotron based x-ray absorption and valence band spectroscopy. Valence band spectra show a strong temperature dep...

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Bibliographic Details
Published in:Journal of applied physics 2019-06, Vol.125 (21)
Main Authors: Panchal, Gyanendra, Choudhary, R. J., Yadav, Satish, Phase, D. M.
Format: Article
Language:English
Subjects:
Applied physics
Barium titanates
Electronic properties
Ferroelectric materials
Ferroelectricity
Phase transitions
Spectrum analysis
Temperature
Temperature dependence
Valence band
X ray absorption
Online Access:Get full text
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Summary:We report the modifications in the electronic properties of single phase polycrystalline BaTiO3 due to ferroelectric to paraelectric phase transition revealed by temperature dependent synchrotron based x-ray absorption and valence band spectroscopy. Valence band spectra show a strong temperature dependence of Ti-3d and O-2p hybridized states around the phase transition. It is observed that Ti-O hybridization is stronger in the paraelectric phase, which is also supported by multiplet calculations at the Ti L-edge. We also find a reduced crystal field value in the paraelectric phase than in the ferroelectric phase, which is caused by volume expansion and a reduction in tetragonal distortion.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5089731