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Ferroelectric phase coexistence by crystallite size reduction in BiFeO3-PbTiO3

Kothai, V and Narayan, Bastola and Brajesh, Kumar and Kaushik, SD and Siruguri, V and Ranjan, Rajeev (2014) Ferroelectric phase coexistence by crystallite size reduction in BiFeO3-PbTiO3. In: PHYSICAL REVIEW B, 90 (15).

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Official URL: http://dx.doi.org/ 10.1103/PhysRevB.90.155115

Abstract

Size effect in ferroelectrics has been extensively investigated in the past with the general consensus that the long-range ferroelectric ordering gradually disappears with decreasing crystallite size, eventually leading to the paraelectric state. In this paper, we show that the compositions exhibiting giant tetragonality (c/a similar to 1.18) of the ferroelectric alloy system BiFeO3-PbTiO3 transform from a pure tetragonal phase to a state comprising tetragonal and rhombohedral phases as the average crystallite size is reduced from similar to 10 to similar to 1 mu m. It is argued that the increased surface energy in the smaller sized crystallites creates an equivalent compressive stress that drives the system towards tetragonal-rhombohedral criticality.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 14 Dec 2014 10:46
Last Modified: 14 Dec 2014 10:46
URI: http://eprints.iisc.ac.in/id/eprint/50442

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