Dielectric and piezoelectric properties of textured Sr0.53Ba0.47Nb2O6ceramics prepared by templated grain growth

Abstract

Fiber textured Sr0.53Ba0.47Nb2O6ceramics were reactively sintered to ≥95% of the theoretical density from a mixture of SrNb2O6and BaNb2O6powders. Texture in 〈001〉 was obtained by templated grain growth on 〈001〉-oriented acicular KSr2Nb5O15template particles. The most highly textured ceramics had a peak dielectric constant of 23,600 (atTc= 128 °C), a remanent polarization (Pr) of 20.3 µC/cm2, a saturation polarization (Psat) of 24 µC/cm2(69–96% of single crystal), and a piezoelectric charge coefficient (d33) of 84 pC/N (76–93% of single crystal). A model, correlating polarization with grain orientation, predicts thatPrincreases sharply when a percolating grain network forms to transfer charge between elongated grains.