The effect of localized magnetic moments on the positron annihilation was first found in dilute solid solutions of Fe in Pd (1). The concentration dependence of the relative probability for positron annihilation with conduction electrons (W ) in CoAl alloys has shown (2) that in the range of stoichiometric composition the W value is essentially increased. This feature may be accounted for by the positron interaction with structural vacancies and the localized electronic states. The existence of localized magnetic states in CoAl alloys with slight excess of cobalt atoms (50.5 at% co) was confirmed by nuclear magnetic resonance experiments (3). P P Some information has been reported (4) about the formation of localized magnetic moments in FeAl alloys in the range of stoichiometric composition and the present investigation has been undertaken to study their effect on the positron annihilation parameters. The experiments were carried out for FeAl alloys with b.c.c.CsCl type structure containing 32 to 52 at% Al.FeAl alloys with 48, 49, 50, 51, and 52 at% A1 were obtained by melting carbonyl iron and high-purity aluminium in an induction furnace in argon atmosphere. Subsequent chemical analysis has indicated that alloy compositions differ slightly from the above mentioned values. The ingots were subjected to homogeneizing annealing in vacuum at 1000 C for 24 h. The samples were cut from the inner part of ingots.Angular distribution curves for 2 r positron annihilation in FeAl alloys were measured using a VA-64 apparatus. 0 Fig. 1 shows the dependence of the relative probability for positron annihilation with conduction electrons on concentration. It is seen clearly that the alloy with 51 at% Fe has a W value by % 10% larger than that for the rest of alloys under investigation for which W is about the same. P P Previously studied CoAl alloys (2) exhibit the presence of structural vacancies for concentrations with excess A1 atoms (compared with the equi-atomic composition)
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