Phase Transition Behavior and Dielectric Properties of Morphotropic Phase Boundary in (1-x)Pb(Yb1/2Nb1/2)O-3-xPbTiO(3)(0.40 <= x <= 0.60) Solid Solutions

In this study, crystal structural changes and dielectric properties of (1-x)Pb(Yb1/2Nb1/2)O-3-xPbTiO(3) ((1-x)PYN-xPT) solid solutions were measured and analyzed with respect to the PbTiO3(PT) contents (0.40 <= x <= 0.60). From X-ray diffraction (XRD) measurements, (1-x)PYN-xPT solid solutions showed changes of the crystal structure from pseudocubic (0.40 <= x <= 0.44) to tetragonal (0.52 <= x <= 0.60) on increasing PT contents and exhibited the coexistence of pseudocubic and tetragonal phase near the morphotropic phase boundary (MPB) composition (0.46 <= x <= 0.50). The dielectric constant showed a maximum value at x = 0.46 and the maximum values in (1-x)PYN-xPT decreased with higher PT contents. The phase transition temperatures of (1-x)PYN-xFT solid solutions increased over the whole composition ranges tested (0.40 <= x <= 0.60).