Dielectric relaxation behaviour of Bi:SrTiO3: I. The low temperature permittivity peak

The dielectric properties of (Sr1 − 1.5xBix)TiO3 (0.002≤x≤0.167) ceramics were systematically studied. The temperature dependence of the complexpermittivity was measured in the temperature range of 10–300 K. Permittivity peaks with obvious frequency dispersion were observed and with the increase of the Bi content, the temperature of the permittivity maximum of each one is shifted to higher temperatures. In the high temperature side of the permittivity peaks, notable departure from the Curie-Weiss law was observed. The relaxation behaviour is characterised in the present paper. The effect of Bi on the dielectric relaxation behaviour and the physical mechanism giving polarisation are briefly discussed.