Electrical and dielectric properties in double doped BaTiO3 showing relaxor behavior

BaTiO3, when doped with minute concentrations of Bi+3 and Fe+3, was found t o exhibit relaxor behavior. The data on dielectric constant performed as a function of frequency and temperature indicate a reduction in the transitio n temperature with increase in frequency. A poled sample indicated a decrea se in the transition temperature compared to an unpoled sample. It was foun d that the grain boundary capacitance were negligible and the relaxations o ccurred are only due to the bulk of the sample. The results have been discu ssed using impedance and modulus spectroscopy. (C) 1999 American Institute of Physics. [S0021-8979(99)00615-5].