Global and local structural variations near the antiferroelectric regime

Thangavelu, K and Rayaprol, S and Siruguri, V and Sastry, P U and Asthana, Saket (2015) Global and local structural variations near the antiferroelectric regime. AIP Conference Proceedings, 1665 (030030). ISSN 0094-243X

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Rietveld refinement of neutron and x-ray diffraction data of Na 0.5Bi0.5TiO3 shows R3c phase stabilization at room temperature. The intermediate antiferroelectric region between 180°C to 280°C exhibits phase coexistence i.e R3c + Pnma, along with decrease in octahedral tilt angle and increase in unit cell volume. The local structural changes observed from Raman scattering in the A-O, Ti-O and TiO6 phonon modes favor the global structural variation. A possible antiparallel cation displacement due to Pnma phase formation leads to the origin of antiferroelectric ordering in Na 0.5Bi0.5TiO3.

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IITH Creators:
IITH CreatorsORCiD
Asthana, Saket
Item Type: Article
Subjects: Physics
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 18 Jan 2016 08:40
Last Modified: 29 Aug 2017 09:38
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