In the present work, the effects of sintering temperature are investigated for the lead-free (Na0.52K0.4425)(Nb0.8925Sb0.07)O3-0.0375LiTaO3 ceramics. The phase structure transformations are identified via the XRD patterns and Rietveld refinement method. In addition, the electric properties are investigated through the empirical law, the Curie-Weiss law and the ferroelectric hysteresis loops. The best piezoelectric properties (Pr = 41.96 μC/cm2, Ec = 7.77 kV/cm, d33 = 310 pC/N and kP = 48%) were obtained at the sintering temperature of 1130◦C. The response mechanisms suggest that a more polymorphic phase boundary, a more uniform grain, a higher density and fewer cation-oxygen vacancies can improve the electric properties.
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