Electrical conduction behavior of mixed ionic-electronic conductor Y0.08Sr0.92Ti1 − xScxO3 − δ

Y0.08Sr0.92Ti1 − xScxO3 − δ was synthesized via sol–gel method. With the Sc-doping amount increasing, the electrical conductivity of Y0.08Sr0.92Ti1 − xScxO3 − δ increased in 400–900 °C and the ionic conductivity increased between 600 and 900 °C. The optimized Y0.08Sr0.92Ti0.93Sc0.07O3 − δ sample exhibits an electrical conductivity in the order of 0.058–0.085 S·cm− 1 at 400–900 °C. The ionic conductivity for Y0.08Sr0.92Ti0.93Sc0.07O3 − δ was 0.027 S·cm− 1 and increased about 140% compared with Y0.08Sr0.92Ti0.97Sc0.03O3 − δ at 800 °C. Sc-doping increased the oxygen vacancy concentration and decreased the oxygen migration energy, therefore enhancing the conduction process of oxygen ions in Y0.08Sr0.92Ti1 − xScxO3 − δ. The possible charge compensation mechanism of Y0.08Sr0.92Ti1 − xScxO3 − δ can be described as Y0.08Sr0.92Scx3 +Ti0.92 − 2δ − x14 +Ti0.08 + 2δ ‐ x23 +O3 − (δ + x1/2)(x = x1 + x2).

The increase of Sc-doping amount results in the sintering densification and improves the formation of single cubic perovskite structure.Figure optionsDownload high-quality image (291 K)Download as PowerPoint slide