Formation and electrical characterization of Ti-modified Sr0.3Ba0.7Nb2O6 ceramic system

Titanium modified Sr0.3 Ba0.7 Nb2O6 ceramic system has been studied in a wide range of compositions. As the sintering temperature exceeds the 1250 °C, the substitution of niobium by titanium induces liquid phase formation, which enhances the densities of the samples with compositions in the monophasic range. X-ray diffraction analysis shows a linear titanium incorporation into the Sr0.3 Ba0.7 Nb2-y TiyO6-y/2 system up to a solubility limit 0.07 < ym < 0.1, which it is also confirmed by the ferroelectric-paraelectric temperature transition. Both, the diffuse character of the system and the dielectric constant at room temperature increase as the Ti content increase. The dielectric constant ((epsilon)r = 420) of the sample with a titanium content of 0.07 are two times higher than the reported for the SBN (30/70) system.