Structure and the location of the morphotropic phase boundary region in (1-x)[Pb(Mg_1/3Nb_2/3)O₃]-xPbTiO₃

Abstract

The structure of (1-x)-xPbTiO₃ is tetragonal and rhombohedral for x ≥ 0.35 and x ≤ 0.30, respectively. The intrinsic width of the morphotropic phase boundary region (0.30 < x < 0.35) is an order of magnitude smaller than hitherto believed. The structure of the morphotropic phase for x = 0.34 is shown to be monoclinic with space group Pm and not a mixture of rhombohedral and tetragonal phases.