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The sequence of phase transformations during Sr 2 FeMoO 6-x crystallization by the citrate-gel method was studied for powders synthesized with initial reagent solutions with pH values of 4, 6 and 9. Scanning electron microscopy revealed that the as-produced and annealed powders had the largest Sr 2 FeMoO 6-x agglomerates with diameters in the range of 0.7-1.2 µm. The average grain size of the powders in the dispersion grows from 250 to 550 nm with increasing pH value. The X-ray diffraction analysis of the powders annealed at different temperatures between 770 and 1270 K showed that the composition of the initially formed Sr 2 FeMoO 6-x changes and the molybdenum content increases with further heating. This leads to a change in the Sr 2 FeMoO 6-x crystal lattice parameters and a contraction of the cell volume. An optimized synthesis procedure based on an initial solution of pH 4 allowed a single-phase Sr 2 FeMoO 6-x compound to be obtained with a grain size in the range of 50-120 nm and a superstructural ordering of iron and molybdenum cations of 88%.

beilstein journal of nanotechnology

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr<sub>2</sub>FeMoO<sub>6−x</sub> nanopowders formed by the citrate–gel method

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr2FeMoO6−x nanopowders formed by the citrate–gel method

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr₂FeMoO_6−x nanopowders formed by the citrate–gel method