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Degenerate rhombohedral and orthorhombic states in Ca-substituted Na0.5Bi0.5TiO3

Ranjan, Rajeev and Kothai, V and Garg, Rohini and Agrawal, Anupriya and Senyshyn, Anatoliy and Boysen, Hans (2009) Degenerate rhombohedral and orthorhombic states in Ca-substituted Na0.5Bi0.5TiO3. In: Applied Physics Letters, 95 (4). 04290-1-04290-3.

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Abstract

Neutron powder diffraction and temperature dependent dielectric studies were carried out on Ca-substituted Na0.5Bi0.5TiO3, i.e., (Na0.5Bi0.5)(1-x)CaxTiO3. Stabilization of an orthorhombic phase even at a low Ca concentration (0.05 < x < 0.10) suggests that Na0.5Bi0.5TiO3 (NBT) is susceptible to orthorhombic distortion. The orthorhombic and rhombohedral phases coexist for x=0.10, suggesting these phases to be nearly degenerate. The orthorhombic distortion favoring tendency of Ca assists in promoting the inherent instability with regard to this structure in pure NBT, which was reported recently.

Item Type: Journal Article
Additional Information: Copyright of this aricle belongs to American Institute of Physics.
Keywords: bismuth compounds; calcium; crystal structure; dielectric materials; neutron diffraction crystallography; optical susceptibility; permittivity; sodium compounds; space groups
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 25 Aug 2009 06:48
Last Modified: 19 Sep 2010 05:42
URI: http://eprints.iisc.ernet.in/id/eprint/22465

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