Abstract
The paper reports results on the phase coexistence in the perovskite-type ferroelectric solid solutions near the morphotropic phase boundary. Diagrams that describe features of the phase coexistence are put forward to interpret experimental data on various heterophase states in solid solutions of (1 – x)Pb(Fe1/2Nb1/2)O3 – xPbTiO3 and (Bi1−x Pb x )FeO3. The molar-concentration dependence of the volume fraction of the morphotropic phase is determined using experimental data on the unit-cell parameters of (1 – x)Pb(Fe1/2Nb1/2)O3 – xPbTiO3 (x = 0.05 – 0.08). The role of elastic matching of the phases and possibilities of the complete stress relief in wide temperature ranges are discussed.
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