Electrical properties of the titanium modified SBN ceramic system

The electrical properties of the Sr0.3Ba0.7Nb2O6 system modified with diffe rent concentrations of titanium, following the general formula Sr0.3Ba0.7Nb 2-yTiyO6-y/2 for charge compensation, are studied. The investigation is car ried out in samples prepared by the conventional ceramic method. The X-ray diffraction analysis shows tetragonal tungsten bronze monophasic compounds in all cases. Dielectric measurements show a typical ferroelectric behavior with diffuse phase transition, where the transition temperature and the ma ximum permittivity decrease with increasing titanium content. The remanent polarization is obtained from hysteresis measurements in the ferroelectric region, while at high temperatures, two processes (a conductive and a ferro electric process) are overlapping. The diffuse character of the ferroelectr ic-paraelectric phase transition is also studied and the diffusivity coeffi cient calculated in all cases.