Abstract
The dielectric properties and electrical conduction of Ba1−xSrxTiO3 (x = 0.2, 0.25, 0.3) ceramics have been investigated in the temperature range 25–400 °C and the frequency range 100 Hz–1 MHz. The broad dielectric peaks ε′(f), tanδ(T), tan δ(f) and the distribution parameter β are all indicative of a typical relaxation behaviour existing above 200 °C for all compositions. With increasing Sr content, more grain boundaries acting as ‘electrical barriers’ lead to the conductivity decreasing and the activation energy Ea = 0.88–0.96 eV for different compositions indicates that the oxygen vacancies acting as ‘polarons’ under the external ac electric field lead to the relaxation behaviour.
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