Effect of silver content on the phase transition and electrical properties of 0.95 [(K_(0.5)Na_(0.5))NbO_3]-0.05LiSbO_3 ceramics

摘要

Lead free 0.95 [(K_(0.5)Na_(0.5))NbO_3]-0.05LiSbO_3 (KNAN-LS) ceramics with x = 0, 0.02, 0.04, 0.06 and 0.08 have been synthesized by conventional solid state reaction route (CSSR). X-ray diffraction (XRD) analysis confirmed the transformation of mixed structure to pure tetragonal structure with the increase in Ag content in KNN-LS ceramics. The Curie temperature (T_c) of the ceramics decreased from 385.5 °C to 331 °C with the increase in silver (Ag) content. The poling temperature was optimized for better piezoelectric properties. The KNAN-LS ceramics with x = 0.06 showed better piezoelectric and ferroelectric properties (d_(33) = 227 pC/N, k_p = 42.5%, T_c = 368 °C and P_r = 21.9 μC/cm~2).