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Abstract
Temperature X-ray, pyro- and dielectric measurements of Pb(Fe0.5Ta0.5)O3-single crystals have been carried out. It was concluded that Curie temperature (Tc ) of this compound is about 370 K, but not 243 K as it has been decided early. Well-known experimental data have been analyzed on ferro- (FE) and antiferroelectric (AFE) perovskites of simple and complex composition. It was concluded that in many cases Tc has to be connected with weakly manifested high temperature anomalies of structural parameters and of electrophysical properties, but not with strongly manifested anomalies observed often at lower temperatures.