Abstract
The neutron diffraction technique is used to study the temperature variation of the sublattice magnetizations of five different ferrites. Qualitative agreement with the Néel theory is obtained in all cases in the respect that the magnetization curve of the tetrahedral ions is more convex than the one due to octahedral ions. The data on magnetite are used in a quantitative analysis in terms of molecular field coefficients. It is shown that coefficients determined from conventional magnetic data do not reproduce the sublattice magnetization. This inconsistency is interpreted as an inability of the molecular field equations to take proper account of the magnetic interactions.
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