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Phase diagrams of three sections of the four-component system PbTiO 3 -PbZrO 3 -PbNb 2/3 Mg 1/3 O 3 -PbGeO 3 are plotted (at 20°C) and electrophysical properties of solid solutions are studied. It is found that morphotropic areas, in which dielectric, piezoelectric, and elastic properties are extreme, have a wider concentration interval than in binary systems serving as the base for the studied solid solutions. In monophase areas, isosymmetrical fields (phase states) divided by areas of constant structural parameters are revealed. An explanation of the observed effects based on the real defect structure of objects is proposed.
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Reznitchenko et al. (2009) studied this question.
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