Nuclear magnetic resonance on oriented 192Ir in Fe und Ni

The hyperfine interaction of 192Ir nuclei as dilute impurities in Fe and Ni has been investigated with NMR on oriented nuclei. With the use of highly dilute and pure alloys the line widths could be reduced so far that the quadrupole splitting of 192IrFe and 192IrNi could be resolved. Taking hyperfine anomalies into account the ground state nuclear moments of 192Ir are deduced as μ = 1.924(10) μsub(N) and Q = 2.36(11) b. The hyperfine field of IrNi was investigated as a function of the Ir concentration c between 0.01 at% and 5 at%. The dependence of Hsub(HF) on c was found to be significantly smaller than that reported from Moessbauer effect measurements. For c = 0.01 at% Hsub(HF) = -454.7(2.3) kG is deduced. The resonance shift with an external magnetic field has been studied precisely, yielding K = 0.012(23) and K = 0.026(12) for the Knight-shift of 192Ir in Fe and Ni, respectively. (orig.)