Abstract
This report describes the sintering and ferroelectric characteristic of 0.76 Bi0.5Na0.5TiO3 (BNT)–0.26SrTiO3 (ST) with CuO addition, synthesized by using a solid-state reaction. The XRD, microstructure, and density results reveal that Cu element reduces the sintering temperature from 1150 to 1000 °C. In dielectric study, CuO addition induces the increase of relaxation behavior for 26ST ceramic in the high temperature regime. In the low temperature regime (< 150 °C), the Cu doping to 26ST accelerates the degree in freezing of dipole, presumably due to the interaction between A site vacancy and nanodomain boundaries. The electromechanical properties of 26ST ceramics with CuO doping show a significant decay in frequency dependence of polarization and strain, which might be related to the formation of A-site cation vacancy.
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