Abstract
Magnetic properties of fine particles of rare earth-transition metal compounds (in particular LaNi 5) were studied with respect to oxidation at various temperatures. The relevance of oxidation processes to permanent magnet technology and applications of hydrogen storage is indicated. For pulverized and dehydrided LaNi 5 a nearly linear decrease in magnetic moment was observed between 77 K and room temperature. The characteristics of superparamagnetism are apparent. The stability of fine particle LaNi 5 was found to be fairly good in air but poor in hardened epoxy resin. The parabolic oxidation rate characteristics were determined for LaNi 5 heated in oxygen.
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