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Domain configurations and structures of ferroelectric KTa1−x NbxO3 crystals in both orthorhombic and tetragonal phases are studied by a polarizing microscope. It is found that the domain patterns vary in plates of different thicknesses. The domain evolution and new phase nucleation during the first-order orthorhombic-tetragonal-cubic phase transitions with large thermal hysteresis are directly observed under polarized light. The emergence of a large number of microdomains upon cooling is revealed and discussed.
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Huang et al. (1995) studied this question.
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