Abstract

The magnetic properties of a sample of synthetic ferrihydrite have been investigated by use of Mossbauer spectroscopy. The area ratios of the Mossbauer lines are not significantly changed by application of magnetic fields at 5 K, indicating an amorphous magnetic structure. An average magnetic moment per particle of 3.1×10−21 JT−1 was estimated from the dependence of the hyperfine splitting of the Mossbauer spectra on external magnetic fields at 80 K.

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