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

Titanium modified Sr0.3Ba0.7Nb2O6 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 Sr0.3Ba0.7Nb2−yTiyO6−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 (ɛr = 420) of the sample with a titanium content of 0.07 are two times higher than the reported for the SBN (30/70) system.