Abstract
In TDPAC studies of the electric quadrupole interaction in RuxSc1−x alloys two different electric fieldgradients (EFG) have been observed at the site of99Ru: Vzz(I)=12.6·1017 V/cm2 and Vzz(II)=18.9·1017 V/cm2. The corresponding relative fractions f(I) and f(II), respectively, vary with the Ru concentration x. For low concentrations x<0.01 most nuclei (f(I)∼0.8) experience the smaller EFG Vzz(I). At x=0.01, however, the fraction f(I) goes abruptly to zero and Vzz(II) becomes dominant. In view of these results the previous interpretation of Vzz(II) as the EFG of dilute Ru on substitutional Sc sites can no longer be maintained. The Ru-Sc configurations producing these EFG's have not yet been identified. In the intermetallic compound Ru2Sc the interaction is completely different, in RuSc3, however, similar values have been observed.
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