Temperature dependent electrical properties of 0.95[(K_(0.5)Na_(0.5))_(1-x)Ag_xNbO_3]-0.05LiSbO_3 ceramics

摘要

Lead free 0.95[(K_(0.5)Na_(0.5))_(1-x)Ag_xNbO_3]-0.05LiSbO_3 (KNAN-LS) ceramics with x=0.02, 0.04, 0.06 and 0.08 have been synthesized by conventional solid state reaction route (CSSR). XRD analysis confirmed the presence of a mixed structure for x=0.06. The orthorhombic-tetragonal polymorphic phase transition (PPT) temperature and the Curie temperature (T_c) decreased with the increase in Ag~+ ion content in KNAN-LS ceramics. The relationship between the PPT of the ceramics and the temperature dependence of electrical properties of KNAN-LS ceramics were discussed in detail. The KNAN-LS ceramics with x=0.06 showed better piezoelectric and electromechanical properties (d_(33)=227pC/N and k_p=42.5%).