Abstract
The temperature dependences of the permittivity ɛ and the false-color image patterns obtained by the rotating polarizer method for single crystals of (1 − x)NaNbO3−xGd1/3NbO3 (x = 0.003, 0.090) solid solutions with different degrees of diffuseness of the phase transition are investigated. A multifractal analysis of the false-color images has revealed anomalies in the temperature dependences of the parameter ƒ∞ of the multifractal spectrum. For a sample with a sharp phase transition (x ≈ 0.003), the temperature of this anomaly is in good agreement with the temperature of the jumps in the permittivity ɛ(T) and birefringence. For an NNG crystal with x ≈ 0.09, which exhibits a diffuse maximum of ɛ(T), the temperatures of the anomalies of ƒ∞(T) differ in the central and peripheral regions, which correlates with the distribution of Gd over the crystal.
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