Abstract
It was found that quasi-periodic microdomains could be produced within a temperature range of several degrees centigrade below the Curie point in KNbO3and BaTiO3. The geometry and the diffraction contrast image characteristics of the microdomains show that they cannot be the normal 180 degrees or 90 degrees microdomains; they are the so-called 'order-modulated' microdomains, which result from the crossover of the 'order-disorder' and the 'displacive' phase transitions in these two materials. A mixed model of both 'order-disorder' and 'displacive' phase transitions was suggested to explain the experimental results obtained with transmission electron microscopy.
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