Solid solutions of the PbII(M1-xMx')IVO3 (M, M'=Ti, V and Cr) perovskites, synthesized under high pressure and high temperature
Abstract
The structural characteristics of Pb(M 1- x M )O 3 solid solutions, with M, M'=Ti, V and Cr, have been investigated by powder X-ray diffraction. The specimens studied were synthesized under high pressure and high temperature in a 'belt-type' apparatus. The analogy between polymorphic, compared with the PbTiO 3 (tetragonal↔cubic phase transition), and morphotropic transformation in these systems is sufficiently close so as to be able to use the Birch-Murnaghan equation of state of PbTiO 3 and relate it to the internal (or the so-called 'chemical') pressure generated by the substitution of vanadium or chromium along the different solid solutions.