Magnetic properties of spherical hematite (α-Fe2O3) particles of narrow size distribution, having modal diameters ranging from 30 to 410 nm, are studied in the neighborhood of the Morin transition as a function of applied magnetic field with increasing and decreasing temperatures. It is found that this transition is of the first order and sensitive to the size of particles, their strain, and defects. An empirical result describing the influence of these contributions to the Morin temperature is obtained. The presented results strongly suggest that the magnetic “phases” proposed by Krupyanskii and Suzdalev do not exist.
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Muench et al. (1985) studied this question.
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