Dielectric Relaxation Behavior of Strontium Barium Niobate Ferroelectric Ceramics

The complex dielectric response of tungsten bronze Sr1-xBaxNb2O6 [SBN(1-x)/x, x=0.40,0.50 and 0.60] relaxor ferroelectric ceramics was carefully studied as a function of temperature between -180℃ and 450℃. Three distinct relaxation features were observed in all the compositions.The thermal hysteresis of dielectric maximum was considered to be associated with lock in ,of the incommensurate phase. It was confirmed by investigation of the Curie-Weisis behavior at ahigher temperature range. These results were also discussed in terms of the polarization fluctuationof polar microregions briefly.