We have directly observed fluctuating dipolar clusters in the mixed crystal KTa0.991 Nb0.009{O}₃$ using inelastic-light-scattering techniques for temperatures between 1.8 and 25 K and for electric fields up to 2 kV/cm. Together with earlier dielectric-relaxation data, our data span over nine decades in frequency and obey a Vogel-Fulcher relaxation model over the temperature range 6-15 K with an extrapolated transition at 3.0 K to a glassy dipolar state.
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Lyons et al. (1986) studied this question.
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