There fore,lead-free piezoelectric ceramics have attracted attention in a bid to replace lead-based piezoelectric ceramics . Lead-free piezoelectric ceramics that have been investigated widely on account of their excellent piezoelectric and dielectric properties include BaTiO3 (BT) [3], (K,
Na) KNbO3 (KNN) [4], (Bi,Na)TiO3 (BNT) [5], and(Bi,K)TiO3
(BKT) [6].