1Ferroelectric Research Laboratory, Department of Physics, A N College, Patna 800013, India
2Department of Ceramics and Glass Engineering and CICECO, University of Aveiro, 3810-193, Aveiro, Portugal
3School of Materials, University of Manchester, Grosvenor Street, Manchester, M1 7HS, UK
Adv. Mater. Lett., 2012, 3 (2), pp 92-96
DOI: 10.5185/amlett.2011.6279
Publication Date (Web): Apr 14, 2012
Copyright © IAAM-VBRI Press
E-mail: radheshyamrai@ua.pt
Polycrystalline samples of Bi(Mg0.5Ti0.5)O3-PbTiO3 (BMT-PT) solid solutions exhibit high ferroelectric Curie temperatures and are promising materials for high temperature piezoelectric devices. A morphotropic phase boundary (MPB) between ferroelectric rhombohedral and tetragonal phases occurs between BMT-PT ratio of 70-30 and 65-35 compositions. In the present investigation, ceramics having BMT-PT ratios in the range from 70-30 to 50-50 were prepared by a conventional solid state reaction method. The change of crystal structure as a function of composition and temperature has been studied using high temperature X-ray diffraction. Polarisation-Electric field hysteresis curves at different temperatures show antiferroelectric behaviour for x = 0.30, 0.35 and 0.40 compositions while 0.45 and 0.50 show a ferroelectric behavior.
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