The rapid loss of straightforward ferromagnetism for small substitutions of Al on Fe sites in CeFe 2 has been studied by AC susceptibility measurements with and without small superposed steady fields. A fall in magnetic response at low temperatures like that of re-entrant spin glasses is already present at 1% substitution, by 3.5% the ferromagnetic divergence is greatly reduced and by 8% it has disappeared to leave only spin-glass behaviour. Possible origins of this behaviour, which is related to that of alloys with other elements, and the possible relevance of recent work on other RFe 2 phases are discussed.
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Roy et al. (1987) studied this question.
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