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Abstract
The real distribution function of the relaxation times g(τ) of relaxor ferroelectric ceramics PLZT 8/65/35 and 9.5/65/35 was calculated from the dielectric measurements results in a wide frequency range (101 – 1012 Hz). Below the Burns temperature TB ≅ 620 K, when the clusters begin to appear on cooling, the distribution function of the relaxation times is symmetrically shaped. On cooling the dispersion and loss spectra strongly broaden and slow down, the g(τ) function becomes asymmetrically shaped and the second maximum appears. The width of the g(τ) function was calculated at different temperatures. The longest relaxation times diverge according to the Vogel-Fulcher law with the freezing temperature 299 and 252 K for the 8/65/35 and 9.5/65/35 samples, respectively. The shortest relaxation time is about 10−12 s and it remains almost temperature independent.