Abstract
Bi(Mg0.5Ti0.5)O3–PbTiO3 (BMT–PT) ceramics, with BMT–PT ratios ranging from 70-30 to 50-50, were prepared by a conventional solid state reaction process. The 50-50 BMT–PT ceramic possessed a tetragonal perovskite structure with a c/a ratio of ~1.037. Increasing BMT content led to a reduction of tetragonality and a change of structure to a rhombohedral or pseudo-cubic phase. Dielectric measurements, carried out during heating, indicated the occurrence of two phase transformations, which were identified as relaxor ferroelectric to antiferroelectric (at a temperature in the range from 150–300 °C) and antiferroelectric to paraelectric (at a temperature around 500 °C). The antiferroelectric nature of the 60-40 and 70-30 BMT–PT ceramics in the intermediate temperature range was confirmed by polarisation-electric field hysteresis measurements.
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