Enhanced Ferroelectric Properties of Potassium Sodium Niobate Ceramics Modified by Small Amount of K₃Li₂Nb₅O₁₅.

Zeng, Jiangtao; Zhang, Yanghong; Zheng, Liaoying; Li, Gurong; Yin, Qingrui

(1− x)K0.5Na0.5NbO3– xK3Li2Nb5O15 (KNN–100 xKLN) ceramics were prepared by the solid-state reaction method. The results showed that small amount of KLN ( x≤0.02) incorporated into the lattice and formed a single phase perovskite structure. The KLN modification lowered the phase transition temperature of orthorhombic–tetragonal ( TO−T) and increased the Curie temperature ( Tc), but the transition temperatures remained almost unchanged in the range of x from 0.02 to 0.03. Small amount of KLN decreased the amount of defects, thus the remnant polarization increased and the coercive field decreased markedly, and the piezoelectric properties of KNN ceramics modified by small amount of KLN also enhanced markedly.

PIEZOELECTRIC ceramics; FERROELECTRIC crystals; POTASSIUM compounds; NIOBATES; CERAMICS; LATTICE theory; PEROVSKITE

Journal of the American Ceramic Society, 2009, Vol 92, Issue 3, p752

0002-7820

Academic Journal

10.1111/j.1551-2916.2008.02921.x