MOSSBAUEREFFECT IN 61NI

With the Möβbauer technique the hyperfine splittings of the 67.4 keV transition of61Ni in compounds and alloys have been studied. A magnetic moment Μ61,4=+ (0,477 ±0.031)Μn of the first excited state has been determined. From isomer shifts an order of magnitude estimate of the change in radius of δ〈r2〉/〈r2〉=-6· 10-4 can be inferred. The electric quadrupole interaction of the first excited level has been observed in Ni-J-boracite. In addition the hyperfine fields at the nickel sites were determined in the alloy series NixFe1-x(0≦x≦1). In one case an effect of polarization in a high external field is measured. The fields in some rare earth (RE) intermetallic compounds of the form RENi2 were deduced from linewidth to be less than 15 kOe. © 1969 Springer-Verlag.