Determination of compositional fluctuation region in ternary perovskite solid solution of rhombohedral PbZrO3-PbTiO3-Pb (Mg1/3Nb2/3) O3 system

A method was developed for the determination of the compositional fluctuation region in the ternary solid solution of rhombohedral PbZrO3-PbTiO3-Pb (Mg1/3Nb2/3)O-3 system. The compositional fluctuation region was determined from fluctuation limits of lattice spacing and Curie temperature. The fluctuation of the lattice spacing was determined from the measurement of the dependence of broadening of powder X-ray diffraction peaks on diffraction angle. The fluctuation of the Curie temperature was determined from the width of the peak of dielectric constant at the Curie temperature. Lines of compositions having the lower and upper limits of fluctuations of h00 lattice spacing and Curie temperature were drawn on the ternary diagram. An ellipse region area that touches such compositional lines was drawn. This area was considered to be the compositional fluctuation region.