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Complex structural phase transitions in slightly Ca modified Na0.5Bi0.5TiO3

Garg, Rohini and Senyshyn, Anatoliy and Ranjan, Rajeev (2012) Complex structural phase transitions in slightly Ca modified Na0.5Bi0.5TiO3. In: JOURNAL OF PHYSICS-CONDENSED MATTER, 24 (45).

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Official URL: http://dx.doi.org/10.1088/0953-8984/24/45/455902


A temperature dependent neutron powder diffraction study, in conjunction with dielectric and ferroelectric characterization, of slightly Ca modified Na0.5Bi0.5TiO3 (NBT) revealed an instability with regard to a non-polar orthorhombic (Pbnm) distortion above room temperature. This intermediate orthorhombic phase has earlier been reported for unmodified NBT by electron diffraction studies, but has never been captured by global (x-ray/neutron) diffraction techniques. Calcium substitution seems to amplify the magnitude of this intermediate orthorhombic distortion thereby making the corresponding superlattice reflections become visible in the neutron diffraction pattern. The study revealed the following sequence of very complex structural evolution with temperature: Cc -> Cc + Pbnm -> Pbnm + P4/mbm -> P4/mbm -> Pm (3) over barm.

Item Type: Journal Article
Publisher: IOP Publishing limited
Additional Information: Copyright for this article belongs to IOP PUBLISHING LTD, ENGLAND
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 28 Dec 2012 08:54
Last Modified: 28 Dec 2012 08:54
URI: http://eprints.iisc.ac.in/id/eprint/45465

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