Mössbauer spectrometry study of magnesioferrite particles
Hamdeh, Hussein H. Xia, Z. Foehrweiser, R. McCormick, B. J. Willey, R. J. Busca, G.
Hamdeh, Hussein H.
Xia, Z.
Foehrweiser, R.
McCormick, B. J.
Willey, R. J.
Busca, G.
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1994-07-01
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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
Abstract
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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IEEE
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Journal of Applied Physics , vol.76, no.2, pp.1135-1140
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0021-8979