Synthesis of the off-stoichiometric oxide system Sr2Fe1+xMo1−xO6 with −1≤x≤0.25−1≤x≤0.25

The half-metallic ferromagnetic oxide compounds are extensively studied in view of their spintronic applications. In this work, we have synthesized and characterized the off-stoichiometric double perovskite Sr2Fe1+xMo1−xO6 with x   being in the range −1≤x≤0.25−1≤x≤0.25, the composition x=0 corresponding to the well-known ferromagnetic system Sr2FeMoO6. The double perovskite has been prepared in a polycrystalline form by the solid-state reaction method and ball milling, calcination in air and reduction in a mixture of He and H2 atmosphere in a thermogravimetric analyzer. Characterization has been done by X-ray diffraction and scanning electron microscopy techniques. Our results show that mechanochemical activation prior to the reaction synthesis helps to reduce the synthesis temperature and avoid the sublimation of MoO3 at high temperatures. The Curie temperature has also been obtained.