Nature of electric field driven ferroelectric phase transition in lead-free Na 1/2 Bi 1/2 TiO 3 : In-situ temperature dependent ferroelectric hysteresis and Raman scattering studies

Karthik, T and Radhakrishanan, Dhanya and Narayana, Chandrabhas and Asthana, Saket (2018) Nature of electric field driven ferroelectric phase transition in lead-free Na 1/2 Bi 1/2 TiO 3 : In-situ temperature dependent ferroelectric hysteresis and Raman scattering studies. Journal of Alloys and Compounds, 732 (25). pp. 945-951. ISSN 0925-8388

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Abstract

Electric field driven in-situ high-temperature polarization (P) vs. electric field (E) and switching current (I) vs. E measurements performed on Na0.5Bi0.5TiO3 (NBT) ceramics gave a direct evidence for the exact nature of polar ordering and witnessed a new ferroelectric phase transition sequence viz., . In-situ high-temperature Raman scattering studies performed on poled NBT revealed the local structural origins of the aforementioned electric field driven ferroelectric (FE) phase transition sequence. The origin of observed two ferroelectric phase co-existence in a narrow temperature range between 180 °C–200 °C is due to the local structural distortion in the TiO bond coupled through TiO6 octahedral tilt transition. The observed antiferroelectric (AFE) phase coexistence above 200 °C is strongly driven by the A-O phonon vibrations as a consequence of a change in A-site symmetry i.e., antiparallel A-site cation displacements.

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IITH Creators:
IITH CreatorsORCiD
Asthana, Sakethttp://orcid.org/0000-0002-6420-3304
Item Type: Article
Additional Information: Author SA acknowledges JNCASR visiting-fellowship, useful for discussion.
Uncontrolled Keywords: Lead-free ceramics Ferroelectricity Phase transition Raman spectroscopy Phonon modes Electric-field driven effects
Subjects: Physics
Materials Engineering > Materials engineering
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 25 Oct 2017 05:13
Last Modified: 21 Nov 2017 04:09
URI: http://raiith.iith.ac.in/id/eprint/3634
Publisher URL: https://doi.org/10.1016/j.jallcom.2017.10.126
OA policy: http://www.sherpa.ac.uk/romeo/issn/0925-8388/
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