Mössbauer spectrometry study of magnesioferrite particles
Hamdeh, Hussein H.
McCormick, B. J.
Willey, R. J.
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Hamdeh, H. H.; Xia, Z.; Foehrweiser, R.; McCormick, B. J.; Willey, R. J.; Busca, G.; , "Mössbauer spectrometry study of magnesioferrite particles," Journal of Applied Physics , vol.76, no.2, pp.1135-1140, Jul 1994 doi: 10.1063/1.357835
Fine particles of ferrimagnetic MgFe2O4 were synthesized through a sol-gel supercritical drying procedure, then cold-pressed and heated at 500 and 800?°C. These materials were characterized by Mössbauer spectrometry in the temperature range 25 298 K, and in the presence of a small applied magnetic field. The Mössbauer measurements show that heat treatment results in the formation of a small percentage of a-Fe2O3, an increase in the mean particle size and hyperfine magnetic field, and a decrease in the inversion parameter of the magnesioferrite. An average anisotropy constant equivalent to the bulk magnetocrystalline anisotropy is estimated for particles with diameter D=14 nm.
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