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Equilibrium phases in the multiferroic BiFeO3-PbTiO3 system - a revisit

Kothai, V and Senyshyn, A and Ranjan, R (2014) Equilibrium phases in the multiferroic BiFeO3-PbTiO3 system - a revisit. In: 7th Joint European Magnetic Symposia (JEMS), AUG 24-30, 2013, Rhodes, GREECE.

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Official URL: http://dx.doi.org/ 10.1051/epjconf/20147509003


The(1-x) BiFeO3-(x) PbTiO3 solid solution exhibiting a Morphotropic Phase Boundary (MPB) has attracted considerable attention recently because of its unique features such as multiferroic, high Curie point (T-C similar to 700 degrees C) and giant tetragonality (c/a -1 similar to 0.19). Different research groups have reported different composition range of MPB for this system. In this work we have conclusively proved that the wide composition range of MPB reported in the literature is due to kinetic arrest of the metastable rhombohedral phase and that if sufficient temperature and time is allowed the metastable phase disappears. The genuine MPB was found to be x=0.27 for which the tetragonal and the rhombohedral phases are in thermodynamic equilibrium. In-situ high temperature structural study of x=0.27 revealed the sluggish kinetics associated with the temperature induced structural transformation. Neutron powder diffraction study revealed that themagnetic ordering at room temperature occurs in the rhombohedral phase. The magnetic structure was found to be commensurate G-type antiferromagnetic with magnetic moments parallel to the c-direction (of the hexagonal cell). The present study suggests that the equilibrium properties in this solid solution series should be sought for x=0.27.

Item Type: Conference Proceedings
Series.: EPJ Web of Conferences
Publisher: E D P SCIENCES
Additional Information: Copy right for this article belongs to the E D P SCIENCES, 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 14 Nov 2014 07:29
Last Modified: 15 Nov 2014 17:51
URI: http://eprints.iisc.ac.in/id/eprint/50283

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