Complex dielectric susceptibility (χ' + jχ'') has been studied at f = 10 -2 -10 5 Hz in the relaxor ferroelectric 0.75Pb(Mg 1/3 Nb 2/3 )O 3 -0.25PbTiO 3 . In addition to the well known relaxor dispersion observed at temperatures around and below the temperature of permittivity maximum T m , a new and comparatively weak dispersion has been disclosed at T > T m . It is described by the `universal relaxation law', χ'' = cot( n p/2)χ'∝ f n -1 . The temperature dependence of the exponent n follows the Vogel-Fulcher relation, indicating a process of freezing into the nonergodic state.
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Bokov et al. (2000) studied this question.
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