Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1799153 | Journal of Magnetism and Magnetic Materials | 2015 | 4 Pages |
Abstract
Tin-iron chromium oxides (Sn0.2Cr1.8âxFexO3 with x varying from 0.3 to 1.3) have been produced by hydrothermal process in a stirred pressure reactor from pure metal chlorides. Single phase corundum structure and nanophase structure of the as-synthesized samples were confirmed by X-ray diffraction (XRD) and by transmission electron microscope (TEM). The results show that the produced powders have grain sizes in the range 25-34 nm. 57Fe Mössbauer spectra show the materials to be paramagnetic for Fe concentration xâ¤0.5 and in ordered magnetic state at higher concentration. The variations of grain sizes, lattice parameters, and Mössbauer parameters as a function of composition have also been investigated. The coercivity increases rapidly with size, attaining a maximum value, and then decreases with size of the particles.
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Condensed Matter Physics
Authors
Kalengay Mbela, T. Moyo, J.Z. Msomi,