Summary
Analysis of saturation magnetization measurements and data from the literature indicate that the cation distribution in the titanomagnetite solid solution series is temperature dependent. The ionic configuration of ferric and ferrous ions on both lattice sites of their spinel structure can be described by a modified Boltzmann relation in agreement with theoretical consideratios. Thermodynamic equilibrium isotherms for the cation distribution and the resulting variation of saturation magnetization are calculated on the basis of the experimental values. These results should be especially valuable for the interpretation of magnetic properties of rapidly cooled igneous rock units where a respective high-temperature metastable state may exist in the magnetic ore component.
Further measurements of the Curie temperature and lattice constant did not confirm a similar effect. Both these parameters should therefore be qualified for the identification of naturally occurring titanomagnetites.
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Bleil, U. An experimental study of the titanomagnetite solid solution series. PAGEOPH 114, 165–175 (1976). https://doi.org/10.1007/BF00878943
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DOI: https://doi.org/10.1007/BF00878943