Lead-free piezoelectric ceramic in the system of Bi/sub 1/2/Na/sub 1/2/TiO/sub 3/-Bi/sub 1/2/K/sub 1/2/TiO/sub 3/-BaTiO/sub 3/ (BiNT-BiKT-BT)

Electromechanical properties of MPB composition (Bi/sub 0.486/Na/sub 0.426/K/sub 0.12/Ba/sub 0.028/TiO/sub 3/) in the system of BiNT-BiKT-BT have been investigated. The conventional processing method has been used to prepare the samples. Dielectric behavior of the MPB composition indicates a phase transition at about 150/spl deg/C. High temperature polarization measurements also confirmed the phase transition, which represents antiferroelectric behavior at 160/spl deg/C. A relatively high d/sub 33/ of 183/spl plusmn/5 pC/N, a tan/spl delta/ of 2.1%, a dielectric constant of 750, a Curie temperature of 295/spl delta/C with thickness and planar coupling coefficients of 55%, and 35% have been obtained. High piezoelectric coefficient with higher thickness coupling coefficients makes this composition, a promising candidate as a lead-free piezoelectric ceramics.