Journal of Materials Science, Vol.48, No.7, 2997-3002, 2013
Lead-free (Li, Na, K)(Nb, Sb)O-3 piezoelectric ceramics: effect of Bi(Ni0.5Ti0.5)O-3 modification and sintering temperature on microstructure and electrical properties
Lead-free (1 - x)(K0.475Na0.475Li0.05)(Nb0.95Sb0.05)O-3-xBi(Ni0.5Ti0.5)O-3 [(1 - x)KNNL-xBNiT] piezoelectric ceramics were prepared by conventional solid-state sintering. The effect of BNiT addition and sintering temperature on phase structure, microstructure, and dielectric and piezoelectric properties of (1 - x)KNNL-xBNiT ceramics was investigated. The results reveal that the addition of small amounts of BNiT causes significant changes in microstructures, crystalline structures, and dielectric and piezoelectric properties. The T (c) values and dielectric constant at T (c) of (1 - x)KNNL-xBNiT ceramics are increased obviously with 0.2 % BNiT addition and decreased with further increasing BNiT content. Enhanced piezoelectric properties are obtained for the sample with x = 0.4 % and synthesized at optimal temperature of 1100 A degrees C, in which d (33) and k (p) are 253 pC/N and 0.52, respectively. These results show that (1 - x)KNNL-xBNiT ceramics are promising lead-free piezoelectric materials.