High-temperature relaxor cobalt-doped (1-x)BiScO3-xPbTiO3 piezoelectric ceramics.

Cobalt-doped (1-x)BiScO₃-xPbTiO₃ piezoelectric ceramics were fabricated by conventional solid state synthesis, in which a morphotropic phase boundary (MPB) region was observed in the compositional range of 0.48≤x≤0.53 from the phase structure measurement. Co doping in the 0.50BiScO₃–0.50PbTiO₃ ceramics resulted in a relaxor ferroelectric behavior due to cation disorder. The ferroelectric phase transition of the composition x=0.50 near the MPB was found to be a displacive and first-order transition with excellent piezoelectric properties, T_m=470 °C, d₃₃=282 pC/N, K_p=0.49, indicating a future high-temperature piezoelectric application [ABSTRACT FROM AUTHOR]