Synthesis and structural studies of the perovskite‐related compound YBaCo₂O_{5 + x}

A new perovskite‐related compound, YBaCo₂O₅, is reported, which has a basic structure which is tetragonal and isomorphous with YBaCuCoO₅. Excess oxygen can be introduced into the anionic sites in the yttrium layer, an effect which could be important in the development of the material as a redox catalyst and a charge carrier reservoir in high‐T_c superconductors as part of a superlattice formed with a superconducting phase. The preparation of the new material and the analysis of its structure are reported.