Fractal character of large-scale nonuniform states in ferroelectric materials with diffuse phase transition

Angular dependence of anomalous contribution into I(θ) scattered light intensity in PbSc1/2Ta1/2O3 disordered crystals is measured. At variation of intensity value by 4 orders one may observe its degree dependence: I(θ)∼θ-α, α=3.2. The problem of physical nature of optical heterogeneities with wide distribution of scales is discussed in terms of fractal concepts. 8 refs.; 1 fig