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 |
Appears in Collections: | Публикации в зарубежных изданиях |
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