Effect of LiSbO3 on the phase structure, microstructure and electric properties of Sr0.53Ba0.47Nb2O6 ceramics

LiSbO3 doped Sr0.53Ba0.47Nb2O6 ceramics were synthesized by conventional mixed-oxide method. The phase structure, microstructure, dielectric and ferroelectric properties of obtained ceramics were investigated. Pure tungsten bronze structure could be obtained in all ceramics and LiSbO3 additive could promote densification and reduce the sintering temperature. The dielectric characteristics showed diffuse phase transition phenomena for all samples, which was proved by linear fitting of the modified Curie–Weiss law with γ value varying between 1.65 and 1.92. With increasing LiSbO3 content, the transition temperature Tc decreased gradually to near room temperature. Normal ferroelectric hysteresis loops could be observed in all compositions, but the remnant polarization (Pr) and coercive field (Ec) all decreased gradually. Besides, the underlying mechanism for variations of the electrical properties caused by LiSbO3 doping was explained in this work.

► LiSbO3 doped Sr0.53Ba0.47Nb2O6 ceramics were synthesized by conventional oxide-mixed method.
► Pure tungsten bronze structure could be obtained in all ceramics.
► LiSbO3 additive could promote densification and low sintering temperature.
► The electrical properties of SBN-LS ceramics greatly depended on x.