Abstract
Superparamagnetic particles of chemically pure samples, in the system Fe(OH)SO 4/Fe(OH)SO 4·(H 2O), are produced by thermal decomposition of ferric sulphate hydrates. The control of particle size distribution is achieved by successive hydration and dehydration processes monitored by X-ray diffraction, electron microscopy, Mössbauer and IR spectroscopy. The particle size modification is related for the particle growth and two mechanisms are suggested thereon.
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