Abstract
Studies of the dielectric relaxation and the electrical conductivity processes for Sr0.15Ba0.85Bi2Nb2O9 relaxor ferroelectric ceramic are carried out to evaluate the influence of extrinsic and/or intrinsic defects on the a.c. response. The Cole-Cole model and the Universal Dielectric Response are used to determine the nature of these defects. The temperature dependence of both processes in the range 30 °C approximately 210 °C is associated to the response of polarons, in disordered surrounding, to the applied electric field. For higher temperatures, the main contribution to both dielectric relaxation and electrical conductivity processes is attributed to electrons that result from the ionization of oxygen vacancies. The study provides indirect evidence on the relaxor freezing temperature.
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