Synthesis and electrical properties of mixed-conducting YxSr1 _xTi0.6Fe0.4O3-δ

A single phase perovskite, YxSr1-xTi0.6Fe0.4O3-delta (x=0.07, 0.08, 0.09), was synthesized at 1350 degrees C by the sol-gel method. The effects of Y-doping on the electronic and ionic conductivities of YxSr1-xTi0.6Fe0.4O3-delta were investigated. The ionic conductivity of SrTiO3-based materials can be significantly improved by Y-doping on the A-site and Fe-doping on the B-site. We report in this paper a remarkable enhancement of ionic conductivity of Y, Fe co-doped SrTiO3 by the increase in Y-doping amount on the A-site. The total electrical conductivity and ionic conductivity were 0.135 S/cm and 0.017 S/cm for Y0.07Sr0.93Ti0.6Fe0.4O3-delta at 800 degrees C, respectively, while were 0.056 S/cm and 0.02 S/cm for Y0.09Sr0.91Ti0.6Fe0.4O3-delta. (C) 2014 Elsevier B.V. All rights reserved.