One-step processing of spinel ferrites via the high-energy ball milling of binary oxides

Autor:	Everett E. Carpenter, Gary J. Long, J. O. Cross, Amitabh Mohan, J. P. Kirkland, V. M. Browning, Vincent G. Harris, D. J. Fatemi
Rok vydání:	2003
Předmět:	Oxide minerals Materials science Annealing (metallurgy) Metallurgy Spinel Analytical chemistry Oxide General Physics and Astronomy Atmospheric temperature range engineering.material chemistry.chemical_compound chemistry engineering Ferrite (magnet) Particle size Ball mill
Zdroj:	Journal of Applied Physics. 94:496-501
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1577225
Popis:	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.
Databáze:	OpenAIRE
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