A NOVEL LOW TEMPERATURE PREPARATION OF ULTRAFINE NICKEL-ZINC FERRITES AND THEIR MAGNETIC AND MÖSSBAUER CHARACTERIZATION

摘要

Ultrafine particles of Nil-xZnxFe2O4 were prepared under mild hydrothermal conditions by precipitating from metal nitrates. Magnetic and Mössbauer effect measurements revealed the superparamagnetic nature of these particles having average crystallite sizes around 15 nm. These hydrothermal ferrite powders were found to sinter to almost theoretical density with little or no intergranular porosity.