Abstract
A single phase perovskite Y0.08Sr0.92Ti1−xFexO3−δ (x=0.20, 0.40 and 0.50) was fabricated at 1350°C in air by the sol–gel method and its mixed ionic–electronic conductivity was investigated as a function of Fe content. Fe was selected as a B-site dopant with the primary aim to improve the ionic conductivity of SrTiO3-based materials. With increasing Fe-doping amount, the electrical and ionic conductivities of Y0.08Sr0.92Ti1−xFexO3−δ increased in 400–900°C and 600–950°C, respectively. The possible charge compensation mechanism of Y0.08Sr0.92Ti1−xFexO3−δ can be described as Y0.08Sr0.92FexTi4+0.92-xTi3+0.08O3-(δ+x/2) or Y0.08Sr0.92FexTi4+0.92−x1Ti3+0.08−x2 O3−(δ+x1/2) (x=x1+x2).
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