Studies on the KTa1−xFexO3−δ system

In this work we have prepared by ceramic route, polycrystalline powders samples derived from the KTaO3 perovskite by the partial replacement of tantalum by iron with nominal composition KTa1−xFexO3−δ (0 ≤ x ≤ 1), in order to evaluate the consequence of these substitution on the properties of the compounds. Two synthesis temperatures were used, 973 and 1373 K. From the powders (x = 0.1) iron coatings were prepared and tested, as electrode materials, in alkaline solutions. The characterisation of the powder samples was made by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrical conductivity measurements. Cyclic voltammetry was used in the electrodes characterisation. The results show that the partial replacement of Ta by Fe and the synthesis temperature affect the properties of the system.