Abstract
Studies of (1-x)NaNbO3-xGd1/3NbO3 crystals in polarized light revealed the independence of the temperature of rotational phase transition into the cubic phase on x. This correlates with the similarity of Na+ and Gd3+ ionic radii. Increase of Gd content leads to the diffusion of permittivity maxima and a dramatic decrease of a mean size of twins (domains). This makes both crystallooptic studies and rotating polarizer method ineffective. Multifractal analysis of false-colour image patterns obtained by rotating polarizer method, using the Metripol microscope system enables to detect the changes in domain (twin) pattern in the temperature range of diffuse phase transition.
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