Abstract
Both Mössbauer absorption and emission spectra have been investigated in order to characterize the first stages of cobalt-doping process involving the coprecipitation of cobaltous and ferrous ions in presence of acicular γ Fe 2O 3 particles in inert atmosphere. The absorption spectra reveal a rapid oxidation of Fe 2+ to Fe 3+ ions mainly involved in magnetic interactions with neighbouring cations. Such a behaviour being not observed for decayed 57Co ions which essentially remain not magnetically ordered, the results obtained suggest, in the first steps, a preferential incorporation of Fe 3+ ions in surface layer of γ Fe 2O 3 particules rather than an epitaxial formation of cobalt-ferrite layer.
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