Description
Potential ionic oxygen conductors with unit formula Sr2TiO4 and Fe-, V-, Nb- and Mo-doped Sr2TiO4 were synthesized through solid state reaction technique. The effect of doping at Ti-site of Sr2TiO4 with Fe3+, Nb4+, V5+ and Mo5+ on oxygen ionic and mixed ionic-electronic conductivity have been investigated. The crystalline structures of these specimens were studied with X-ray diffraction (XRD) for phase determination and the cell parameters were calculated. Surface morphology and composition were studied by SEM-EDS technique. The mixed ionic-electronic conductivity of all prepared compositions of Sr2TiO4 and Fe-, V-, Nb- and Mo-doped Sr2TiO4 were measured by complex impedance spectroscopy (CSI) as a for different dopant concentrations function of frequency and temperature in the ranges of 0.1Hz 1MHz and 25-600 ˚C respectively.
