MnZn ferrites have been produced via the high-energy ball milling of binary oxide precursors. The milled ferrites have a nonequilibrium cation site distribution, with an unusually high population of Zn cations on the octahedral sites. The particle size distribution drops precipitously with milling time from 60±1 to ∼14±1 nm at 10 h, but increases to 18.5±1 nm after long durations (20–40 h) concurrent with the formation of nearly pure ferrite. A 1 h anneal at 673 K facilitates a redistribution of cations to their near equilibrium sites. This processing approach circumvents the need for deleterious high-temperature heat treatments that often lead to nonstoichiometries in the resulting ferrites.
V. G. Harris et al., "One-Step Processing of Spinel Ferrites via the High-Energy Ball Milling of Binary Oxides," Journal of Applied Physics, vol. 94, no. 1, pp. 496-501, American Institute of Physics (AIP), Jul 2003.
The definitive version is available at http://dx.doi.org/10.1063/1.1577225
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