Abstract
A Dy0.5(Sr0.95Ca0.05)0.5MnO3 system has been prepared by the sol gel method and sintered at temperatures of 700 °C and 1350 °C for a similar period of time. Its electrical and dielectrical data as a function of frequency and temperature have been recorded by means of impedance spectroscopy. It is observed that the contribution of grain boundary to total resistance becomes dominant once increasing sintering temperature. The increase of sintering temperature increases the static dielectric constant by 25 times. Such interesting result is understood in the framework of many reasons including the presence of oxygen vacancies. Unlike sample sintered at 700 °C , the compound sintered at 1350 °C reveals two extra relaxation processes. Further, the sample sintered at 1350 °C possesses the higher value of the dielectric constant as well as a lower value of the loss tangent, which makes it a promising candidate for technological applications. For transport properties, the conduction process is found to be governed by the band gap model.
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