Magnetic Properties of Synthetic Feroxyhite (δ′-FeOOH)
C. J. W. Koch, O. K. Borggaard, M. B. Madsen, S. Mørup, 1985. "Magnetic Properties of Synthetic Feroxyhite (δ′-FeOOH)", Proceedings of the International Clay Conference Denver, 1985, Leonard G. Schultz, H. van Olphen, Frederick A. Mumpton
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Mössbauer studies of the magnetic properties of synthetic feroxyhites (δ´-FeOOH) of varying crystallinity showed that large crystallites are ferrimagnetic, probably due to uncompensated spins associated with defects. Heating of these crystallites led to a reduction of their magnetic moment, presumably because the number of defects was reduced during heating. Small crystallites of feroxyhite were found to be speromagnetic, having a magnetic ordering temperature between 80 and 300 K, in contrast to a ferrimagnetic Curie temperature of about 450 K for large crystallites. A speromagnetic component was also found in the spectra of the large crystallites, probably due to the surface atoms.
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Proceedings of the International Clay Conference Denver, 1985
The papers included in this proceedings volume are representative of the research on clays being conducted in all parts of the world at the time of publication. Many of the subjects treated are controversial, and although some ideas expressed may not necessarily represent the views of the editors, the referees, or the publisher, they deserve to be brought to the attention of the international clay community.