DIELECTRIC-RELAXATION BEHAVIOR OF BI-SRTIO3 - I - THE LOW-TEMPERATUREPERMITTIVITY PEAK

The dielectric properties of (Sr1-1.5xBix)TiO3 (0.002 less than or equ al to x less than or equal to 0.167) ceramics were systematically stud ied. The temperature dependence of the complex-permittivity was measur ed irt the temperature range of 10-300 K. Permittivity peaks with obvi ous frequency dispersion were observed and with the increase of the Bi content, the temperature of the permittivity maximum of each one is s hifted to higher temperatures. In the high temperature side of the per mittivity peaks, notable departure from the Curie-Weiss law was observ ed. The relaxation behaviour is characterised in the present paper. Th e effect of Bi on the dielectric relaxation behaviour and the physical mechanism giving polarisation are briefly discussed. (C) 1998 Elsevie r Science Limited. AII rights reserved.