Research on Preparation and Characterization of NiFe2O4 Spinel Nanopowder through Solid-state Reactions

摘要

Nickel ferrite (NiFe2O4) spinel nanopowder was prepared by solid-state reaction at low-temperature. The precursor of NiFe2O4 spinel nanopowder was prepared by rubbing FeSO4·7H2O, NiSO4·6H2O, NaOH and dispersant sufficiently at room temperature. The precursor was calcined at different temperature for different holding time. The content of dispersant was also studied. The structure, surface morphology and size of the grains were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser particle analyzer. The solid-state reaction mechanism was discussed according to the XRD analysis of the precursor. The results showed the NiFe2O4 spinel nanopowder prepared by adding 20wt% NaCl (dispersant) in the rubbing process and calcining at 800℃ for 1 hour was of pure cubic spinel structure with the size of the grains about 50-80 nm. The dispersant (NaCl) was the most important influence factor on the size of the grains and surface morphology of the nanopowder.