Abstract
Pb0.99−xBaxNb0.02[(Zr0.57Sn0.43)0.96Ti0.04]0.98O3 (PBNZST, 0.00≤x≤0.06) ceramics were fabricated via the solid state reaction method and the evolution of structure and antiferroelectricity with Ba content have been systematically investigated. X-ray diffraction reveals that a phase transition occurs from tetragonal to rhombohedral with the increase of Ba content at ambient temperature. The dielectric properties do not show relaxor-like behavior for any of the studied compositions, and the high temperature multicell cubic (PEMC) phase evident in dielectric measurements is suppressed with the addition of Ba. The P vs. E hysteresis loops display a decreasing critical field (EF) with respect to Ba concentration, which is also associated with an increase of the tolerance factor t. A maximum longitudinal strain (xm) as large as 1.94‰ for x=0.04 is observed at 40kV/cm electrical loading, making this composition promising for the applications in large-strain actuators. While the transition field hysteresis (ΔE) increases with Ba modification to some extent.
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