Synthesis and electrical properties of (1-x)(Na_0.5Bi_0.5)TiO₃-xBa(Mg_0.5W_0.5)O₃ piezoelectric ceramics

(1-x)(Na_0.5Bi_0.5)TiO₃-xBa(Mg_0.5W_0.5)O₃ particles with x=0.00-0.08 were synthesized by a solvothermal approach at 230°C for 48h. The results of X-ray diffraction analysis revealed a rhombohedral-tetragonal morphotropic phase boundary (MPB) composition existed in the range of x=0.05-0.06 at room temperature. The ceramics around the phase boundary composition provide excellent piezoelectric properties, i.e., the highest piezoelectric constant, d₃₃, (108pC/N) could be realized at x value of 0.05. By using a casting sintering method, the ceramics consisted of the oriented rod-like particles with condensed sintering body were obtained, and the piezoelectric properties could be improved to show such a high piezoelectric constant as d₃₃=112pC/N at x value of 0.05.