Cr 2 O 3 nanoparticles of controlled particle size were prepared by calcination of a precursor, Cr(OH) 3 , obtained by precipitation with sodium hydroxide. Samples were characterized by transmission electron microscopy and x-ray diffraction. Average particle sizes ranged from 20 to 200 nm. The magnetic properties of Cr 2 O 3 nanoparticles show the presence of a net magnetic moment at the surface due to the large surface/volume ratio. This fact modifies the classical behaviour expected for bulk antiferromagnetic particles. Below the Néel temperature, magnetization curves as a function of the applied magnetic field show the presence of coercive forces in the low-field range.
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zquez et al. (2003) studied this question.
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