Abstract
The MgO∶Fe system as subjected to a variety of heat-treatments has been studied using the Mössbauer effect for Fe57. On firing the MgO∶Fe samples in air, iron initially dissolves in the lattice in its ferric state and is associated with a charge-compensating vacancy. However, on exceeding a certain concentration, magnesioferrite precipitates out. Hydrogen firing of these samples tends to create clusters of metallic iron and Fe2+ at Mg2+ sites. On refiring the samples in air, metallic iron is converted to Fe2O3 and Fe2+ to Fe3+ which subsequently reacts with the lattice to give magnesioferrite and a small fraction of Fe3+ dissolved in the lattice. These changes are found to be completely reversible. In some cases the magnesioferrite particle size is so small that it exhibits superparamagnetism. Although there is a limit to the solubility of Fe3+ in MgO, Fe2+ can be dissolved to any extent.
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Bhide, V.G., Tambe, B.R. Investigation of the MgO∶Fe system using the Mössbauer effect. J Mater Sci 4, 955–961 (1969). https://doi.org/10.1007/BF00555310
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DOI: https://doi.org/10.1007/BF00555310