Abstract
Ultrafine magnetic nickel ferriteNiFe2O4 particles of high crystallinity were directly prepared by forced hydrolysis of ionic iron (III)and nickel (II) solutions in 2-hydroxyethyl ether at about 478 K under atmosphericpressure. The resulting nickel ferrite particles exhibit very interesting magnetic properties:they are superparamagnetic at room temperature and have a saturation magnetizationclose to that of the bulk at low temperature. An in-field Mössbauer study showsclearly that this surprising behaviour is mainly due to: (i) a departure of thecation distribution from the classical distribution encountered in the bulk materialand (ii) the absence of spin canting for both tetrahedral and octahedral cations.
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