Abstract
Bi1-x(Sr0·5Pb0.5)xFeO3 with x = 0.1 and 0.3 were synthesized by solid-state reaction method. The dielectric properties of the samples have been investigated in the temperature range from −100 to 300 °C. The colossal dielectric constant (CDC) behavior was observed in temperature range from 50 to 200 °C and frequency range from 102 Hz to 103 Hz. The CDC behavior is composed of two relaxation processes with the lower temperature relaxation being a dipolar relaxation caused by the hopping of oxygen vacancies and the higher temperature one being a Maxwell-Wagner relaxation caused by hopping oxygen vacancies blocked by grain boundaries. In the temperature range beyond 200 °C, a ferroelectric-phase-transition-induced dielectric anomaly with an extremely huge intensity over 106 was observed in both samples. (Sr, Pb) co-doping in the place of Bi significantly shift the Curie temperature towards a low temperature of 263 and 243 °C for the samples with x = 0.1 and 0.3, respectively.
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