Abstract
Examples of domain structures and elastic matching of phases in a few systems of lead-free perovskite-type ferroelectric solid solutions are described by taking into account the crystallographic method and model concepts on heterophase samples. Features of heterophase (two- or three-phase) states and phase contents in the lead-free systems near the morphotropic phase boundary are discussed, and some variants of elastic matching of polydomain phases and heterophase regions are considered. Diagrams that link volume fractions of specific domain types and phase contents at complete stress relief in heterophase samples near the morphotropic phase boundary are analysed, and calculated results on the phase contents are in agreement with experimental data.
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