Magnetic studies of Sn sub(0.2)Cr sub(1.8-x)Fe sub(x)O sub(3) compounds prepared via the hydrothermal route

Tin-iron chromium oxides (Sn sub(0.2)Cr sub(1.8-x)Fe sub(x)O sub(3) 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...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2015-07, Vol.385, p.282-285
Main Authors: Mbela, Kalengay, Moyo, T, Msomi, J Z
Format: Article
Language:English
Subjects:
Coercive force
Concentration (composition)
Corundum
Diffraction
Electron microscopes
Grain size
Mossbauer effect
Nanostructure
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Summary:Tin-iron chromium oxides (Sn sub(0.2)Cr sub(1.8-x)Fe sub(x)O sub(3) 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. super(57)Fe Mossbauer spectra show the materials to be paramagnetic for Fe concentration x [< or =] 0.5 and in ordered magnetic state at higher concentration. The variations of grain sizes, lattice parameters, and Mossbauer 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.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2015.03.031