Dielectric Properties of Lead-Based Complex-Perovskite Solid Solution Pb(In_(1-x)/2Yb_x/2Nb_1/2)O₃

Lead based-complex perovskite solid solutions Pb(In_(1-x)/2Yb_x/2Nb_1/2)O₃ were prepared through wolframite phase oxides (InNbO4 and YbNbO4), and their dielectric properties were investigated. For Yb concentrations x<0.20, the diffuse phase transition, which was characterized by the broad maximum for the temperature dependence of the permittivity and the dielectric dispersion in the transition region was observed. With increasing x, the maximum permittivity increases. For x>0.20, in addition to the dielectric dispersion, a new frequency-independent dielectric anomaly appears at temperature T_t. With increasing x, T_t increases rapidly and the dielectric dispersion decreases. There is a structural change which is characterized by the splitting of the structure-sensitive maximum of the (200) reflection of X-ray diffraction (XRD) patterns around x=0.20. Thus, the morphotropic phase boundary exists at around x=0.20.