Abstract
Two different non-Debye dielectric spectra are observed in a polydomain relaxor ferroelectric single crystal, Sr 0.603 Ce 0.007 Ba 0.39 Nb 2 O 6 ( SBN :Ce), in the vicinity of T c , 320 K. At very low frequencies, y < 1 s m 1, the susceptibility components vary as h ' h " y m g, g , 0.2-0.7. This behavior is due to irreversible creep-like viscous motion of domain walls with a wide distribution of thermally activated domain wall mobilities. Logarithmic dispersion with a 1/ f -like relaxational spectrum due to reversible wall segment relaxation occurs at larger frequencies, y > 1 s m 1 [3]. The crossover on the frequency scale between both kinds of dielectric response is attributed to a dynamical phase transition as predicted by Nattermann et al. [5].
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