| Popis: |
Earlier Mossbauer effect experiments of 57 Co diffused in Al show basically two different positions for the Co-atoms after irradiation of the sample with fast neutrons: substitutional Co and interstitial Co. In order to study the landing dynamics of Co in Al we have implanted 57 Co in Al at 4.2 K, at which temperature the Al-interstitials are still immobile. The total implanted dose was 10 14 at/cm 2 the implantation energy 85 keV. The Mossbauer spectrum shows two lines: one line corresponds to substitutional Co-atoms, the other one comes from interstitial Co-atoms (in fact the 〈100〉 Co-Al mixed dumbbell position). The population of the substitutional site, found to be 0.46±0.02, can give information on the interaction potentials between Co-Al and Al-Al when the results are interpreted on the basis of a replacement collision model modified by taking into account a spontaneous trapping volume for the lattice atom recoil, around substitutional Co. |
