Abstract

Hydrogen absorption in Co intermetallics leads to a reduction in 3d moment whereas it leads to an increase in 3d moment in Fe compounds. Experimental results obtained on La 2Co 7 and LuFe 2 are discussed together with literature data. Changes in 57Fe isomer shift have been used to assess the importance of charge transfer. It is proposed that the difference in behaviour between Co and Fe compounds is due to a difference in the degree of 3d moment localization.

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