Morphotropic phase boundary in Pb(Ni1/3Nb2/3)O3–PbTiO3 solid solution system

(1−x)Pb(Ni1/3Nb2/3)O3–xPbTiO3 (x=0.28–0.42) solid solution was synthesized by a B-site precursor method and characterized by high-resolution synchrotron radiation X-rays diffraction and dielectric measurement. The results indicated that composition induced phase transition is not continuous, and the intermediate monoclinic phase may exist in morphotropic phase boundary between rhombohedral and tetragonal phases in this solid solution system.