Hase diagram and dielectric properties of Pb(In_1/2Nb_1/2)O₃-Pb(Mg_1/3Nb_2/3)O₃-PbTio₃ ceramics

xPb(In_1/2Nb_1/2)O₃-yPb(Mg_1/3Nb_2/3)O₃-zPbTiO₃ (xPIN-yPMN-zPT) ternary ceramics with morphotropic phase boundary (MPB) composition were synthesized by columbite precursor method. xPIN-yPMN-zPT phase diagram was investigated by x-ray diffraction and dielectric measurements. According to the results of dielectric measurements, the Curie temperatures (T_c) and rhombohedral to tetragonal phase transition temperature (T_r-t) were found to be in the range of 173-212°C and 114-155°C, respectively, indicating that the T_r-t was increased with adding PIN component. In the MPB region, the highest T_r-t/155°C was found in 0.32PIN-0.38PMN-0.30PT ceramic, that greatly expanded temperature usage range.