Abstract
The article reviews the electron microscope studies of incommensurate phases in dielectrics. General structural properties of the incommensurate phase such as the formation of discommensuration (DC) array near the Lock-in transition point are described. Superspacegroup is used for analyzing the continuously modulated structure, being applied to the analyses of the incommensurate structures of Sr2Nb2O7 and Bi2Sr2CaCu2O8. A DC array corresponds to an array of domain walls in the commensurate phase, which forms a characteristic domain structure, such as a so-called ‘stripple’. The domain configuration around the stripple in the IC phase of Rb2 ZnCl4 is identified from the diffraction contrasts of DCs in the electron microscope images.
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