Abstract
Dielectric measurements on Pb2K(Nb0.1Ta0.9)5O15 ceramics have been reported at 140<T<530 K in the 20–109 Hz frequency range. The tetragonal tungsten bronze-type (TTB) material shows a typical ferroelectric relaxor behaviour. Three dielectric dispersions are observed. The relaxor behaviour results from a thermally activated relaxation with a large time distribution. This relaxation could be interpreted in terms of a polar microdomain concept. The two other dielectric dispersions result from a space charge effect and from a relaxation probably related to the TTB structure.
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