Ferroelectric and Dielectric Properties of Strontium Bismuth Niobate Vanadates

Strontium bismuth niobate vanadates, SrBi₂ (V_xNb_1-x)₂O₉ (with 0 ≤ x ≤ 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 (∼200 °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 °C, with 10 at.% vanadium doping, and an increase in dielectric constant from ∼700 to ∼1100, with 10 at.% vanadium doping, at their respective Curie points. The remanent polarization increased from ∼2.4 to ∼8 µC/cm², while the coercive field decreased from ∼63 to ∼45 kV/cm with 10 at.% V⁵⁺ doping.