Abstract
Highly crystalline, nanometre sizedZnFe2O4 particles with different diameters, 6.6 and 14.8 nm, were prepared by forced hydrolysis in apolyol medium. The DC magnetic properties exhibit a strong dependence on the particle sizeas a result of the unusual cation distribution. They clearly establish their superparamagneticcharacter at room temperature and the occurrence of ferrimagnetic or ferromagnetic ordering atlow temperature. The magnetization is found to increase with grain size reduction. The57Fe Mössbauer spectra were recorded at 300 and 4.5 K. There is no evidence for the presence of theFe2+ charge state, confirming the perfect stoichiometry of the two samples. At 300 K, theMössbauer spectra consist of doublets due to the superparamagnetic behaviour whereas at4.5 K they reveal a magnetically blocked state. Mössbauer spectra at 10 K in anexternal 6 T magnetic field applied parallel to the direction of the gamma raysclearly show a close to collinear Néel-like ferrimagnetic ordering for the 6.6 nmparticles and a canted Yafet–Kittel-like ferrimagnetic ordering for the 14.8 nm ones.
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