Jr. Giniewicz et al., IDENTIFICATION OF THE MORPHOTROPIC PHASE-BOUNDARY IN THE LEAD SCANDIUM TANTALATE LEAD TITANATE SOLID-SOLUTION SYSTEM, Journal of Materials Science, 32(9), 1997, pp. 2249-2253
A morphotropic phase boundary between rhombohedral and tetragonal phas
e regions has been identified to lie in the composition range x=0.4-0.
45 by means of X-ray diffraction, and dielectric, pyroelectric, and pi
ezo electric measurements. Some curvature to this boundary at high tem
peratures is indicated in the temperature dependences of the dielectri
c constants and pyroelectric coefficients of poled specimens.