Abstract
The elastic matching of single-or polydomain ferroelectric phases R3m-P4mm, Cm-P4mm, and R3m-Cm and the relaxation of mechanical stresses in PbZr1−xTixO3 solid solutions are investigated. The conditions for constancy of the optimum volume concentrations of twin domains of the P4mm and Cm phases in the vicinity of the morphotropic phase boundary in the x-T diagram are analyzed, and the correlation between the morphotropic boundary and interfaces, namely, the planes of zero mean strains, is discussed.
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