MOSSBAUER-SPECTROSCOPY OF ISOTOPE SEPARATOR IMPLANTED SN-119M IN FCC METALS

Radioactive 119Sn has been implanted in FCC metals by means of an isotope separator. Mossbauer spectra have been measured for the 24 keV transition of 119Sn. Large substitutional fractions are found in all cases. A correlation for substitutional lattice sites between the measured isomer shifts of the impurity atoms and the force constants of the host lattices is discussed. Debye-Waller factors determined for substitutional Sn in the host lattices are found to be smaller than values calculated by a simple mass-defect model. For some host metals indications of an influence of radiation damage on the spectra are observed. Defect sites are assigned to Sn in aluminium and lead. Qualitative conclusions on the structures of these defects are drawn from the determined Mossbauer parameters.