MAGNETIC PROPERTIES OF TRANSITION METALS AND THEIR ALLOYS DETERMINED BY MOSSBAUER MEASUREMENTS WITH 61Ni

摘要

Values of the absorber recoillcss fraction, energy shift, and absolute value of the 61 Ni hyperfine field were obtained for each concentration studied. In the ferromagnetic region 0-98 at. % Pd the spectra showed a partly resolved magnetic hyper-fine splitting with a distribution-of:magnetic* hyperfihe' fields. The average hyperfine field is negative in pure Ni (-76 kOc), changes sign near 50 at. % Pd and rises to a large positive value (+173 kOc) at 90 at. % Pd. Qualitative agreement with these results is obtained with a model based on the assumption that Hhf in Ni-Pd has the same contributions from core polarization and bulk conduction-electron polarization as in other Ni-based alloys, plus a large positive contribution from atoms on neighboring lattice sites.