Phase Structure Transformations and Electrical Properties of (Na0.52K0.4425)(Nb0.8925Sb0.07)O3–0.0375LiTaO3 Ceramics According to Sintering Temperature

In the present work, the effects of sintering temperature are investigated for the lead-free (Na0.52K0.4425)(Nb0.8925Sb0.07)O-3-0.0375LiTaO(3) 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 (P-r = 41.96 mu C/cm(2), E-c = 7.77 kV/cm, d(33) = 310 pC/N and k(P) = 48%) were obtained at the sintering temperature of 1130 degrees 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. (C) 2018 The Electrochemical Society.