PREPARATION AND PROPERTIES OF FINE PARTICLE NICKEL ZINC FERRITES - A COMPARATIVE-STUDY OF COMBUSTION AND PRECURSOR METHODS

Fine particle nickel-zinc ferrites, NixZn1-xFe2O4 where x = 0.2-0.8 have been prepared, both by the thermal decomposition of the precursor, (N2H5)3NixZn1-xFe2(N2H3COO)9 · 3H2O and combustion of redox mixtures containing nickel nitrate, zinc nitrate, iron(III) nitrate, and oxalic acid dihydrazide (ODH) in the required mole ratio. Both the processes yield submicrometer size (60-90 nm), large surface area (85-108 m2/g), sinteractive powders which when heated at 1050°C, 3 hr achieve >98% of the theoretical density. © 1992 Academic Press, Inc. All rights reserved.