The quenching temperature dependence of the magnetic hyperfine fields at the Fe57 nucleus in magnesium ferrite has been investigated by the Mössbauer effect technique. Since the outer absorption lines are broad and asymmetric, the average magnetic hyperfine field is calculated from the two most inner lines. Using a molecular field model and an equilibrium distribution law and taking into account the difference in covalency for the A‐ and B‐site Fe3+ ions, reliable results are obtained concerning the magnetic exchange interactions and the ionic distribution in MgFe2O4.
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Grave et al. (1976) studied this question.
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