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Please use this identifier to cite or link to this item: https://libeldoc.bsuir.by/handle/123456789/11130
Title: Influence of synthesis conditions on microstructure and phase transformations of annealed Sr2FeMoO6−x nanopowders formed by the citrate–gel method
Authors: Gorokh, G. G.
Yarmolich, M. V.
Kalanda, N. A.
Demyanov, S. E.
Terryn, H.
Ustarroz, J.
Silibin, M. V.
Горох, Г. Г.
Ярмолич, М. В.
Каланда, Н. А.
Keywords: публикации ученых;magnetic materials;microstructure;nanoparticles;phase transformation;sol–gel preparation
Issue Date: 2016
Publisher: Beilstein-Institut
Citation: Gorokh, G. G. Influence of synthesis conditions on microstructure and phase transformations of annealed Sr2FeMoO6−x nanopowders formed by the citrate–gel method / G. G. Gorokh and others // Beilstein Journal of Nanotechnology. – 2016. - P. 1202 – 1207.
Abstract: The sequence of phase transformations during Sr2FeMoO6−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 Sr2FeMoO6−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 Sr2FeMoO6−x changes and the molybdenum content increases with further heating. This leads to a change in the Sr2FeMoO6−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 Sr2FeMoO6−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%.
URI: https://libeldoc.bsuir.by/handle/123456789/11130
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