Abstract
Ceramics in the system (1−x)Na0.5Bi0.5TiO3–xBa0.80Ca0.20TiO3 demonstrate a phase boundary between pseudo-cubic and tetragonal at 0.1 <x<0.2. There was a gradual convergence in the temperatures of a frequency-dependent inflection and peak in relative permittivity-temperature plots with increasing x: for x=0.5 and 0.6, normal relaxor-like behaviour was observed, with Tm ~150°C (1kHz). Constriction in the polarisation-electric field hysteresis loops for the phase boundary composition x=0.1 was consistent with an electric field-induced phase transition, giving rise to an electromechanical strain, ~0.25 % at 40kV/cm and high-field d33⁎ ~640pm/V.
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