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Composition driven ferroelectric transformations in lead-free Ba(Ti1-xCex)O-3 (0.02 <= x <= 0.10)

Topolov, Vitaly Yu and Brajesh, Kumar and Ranjan, Rajeev (2016) Composition driven ferroelectric transformations in lead-free Ba(Ti1-xCex)O-3 (0.02 <= x <= 0.10). In: MATERIALS CHEMISTRY AND PHYSICS, 179 . pp. 152-159.

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Official URL: http://dx.doi.org/10.1016/j.matchemphys.2016.05.02...

Abstract

The Ce-modified lead-free Ba(Ti1-xCex)O-3 system is studied with regard to its dielectric and structural phase-transformation behaviour as a function of composition. Detailed Rietveld analysis of x-ray powder diffraction patterns revealed that the system exhibits orthorhombic (Amm2) tetragonal (P4mm) phase coexistence for x = 0.02, pure orthorhombic (Amm2) for 0.02 < x < 0.07 and orthorhombic (Amm2) rhombohedral (R3m) phases for 0.07 <= x <= 0.10. Heterophase states of the Ba(Ti1-xCex)O-3 system are analyzed taking into account domain (twin) types and stress-relief conditions at interphase boundaries. This analysis enables us to consider the role of specific domain types in a complete stress relief even at relatively small values of x. Volume fractions of the ferroelectric phases coexisting in samples are found using the volume fractions of some domain types in these phases at 0.02 <= x <= 0.10. Results of our calculations and experimental studies on the volume fractions of the coexisting phases are consistent. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Publication: MATERIALS CHEMISTRY AND PHYSICS
Publisher: ELSEVIER SCIENCE SA
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords: Ceramics; Rietveld analysis; Crystal structure; Phase transitions
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 19 Aug 2016 06:05
Last Modified: 19 Aug 2016 06:05
URI: http://eprints.iisc.ac.in/id/eprint/54387

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