Ferroelectric and dielectric properties of strontium bismuth niobate vanadates

Strontium bismuth niobate vanadates, SrBi2(VxNb1-x)(2)O-9 (with 0 less than or equal to x less than or equal to 0.1), were prepared by reaction sintering of powder mixtures of constituent oxides. With partial substitution of niobium by vanadium cations (up to 10 at.%), the single-phase layered perovskite structure was preserved, and the sintering temperature of the system was significantly lowered (similar to 200 degrees C). The incorporation of vanadium into the layered perovskite structure resulted in a shift of the Curie point to higher temperatures from 435 to 457 degrees C, with 10 at.% vanadium doping, and an increase in dielectric constant from similar to 700 to similar to 1100, with 10 at.% vanadium doping, at their respective Curie points. The remanent polarization increased from similar to 2.4 to similar to 8 mu C/cm(2), while the coercive field decreased from similar to 63 to similar to 45 kV/cm with 10 at.% V5+ doping.