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Mössbauer studies of thermal neutron radiation damage in an ordered alloy
Author(s) -
Simopoulos A.,
Vogl G.
Publication year - 1973
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220590217
Subject(s) - recoil , mössbauer spectroscopy , alloy , irradiation , neutron , neutron temperature , materials science , ion , radiation damage , atomic physics , nuclear physics , crystallography , physics , chemistry , metallurgy , quantum mechanics
Mössbauer effect measurements on Au 197 were done to study neutron radiation damage in the ordered alloy CoPt. Pt 196 nuclei were irradiated with neutrons to produce unstable Pt 197 nuclei which β decay to the Au 197 Mössbauer nuclei. The average recoil energy of ≈ 30 eV connected with thermal neutron capture led to replacement collisions of Pt 197 ions with their neighbours. The Mössbauer results show that by irradiation at 330 K about 40% of the produced Au 197 atoms have left their ordered sites with eight Co and four Pt nearest neighbours and ended up in sites with an average of (5.5 ± 0.3) Co and (6.5 ± 0.3) Pt nearest neighbours. This result can be explained by a model of replacement collisions of the recoil atoms with nearest or next nearest neighbours in the 〈110〉 or 〈100〉 directions. The results are fairly in agreement with computer‐simulation predictions for low‐energy recoil in f.c.c. metals.