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The High‐Temperature Recovery of Neutron‐Irradiated Rhenium
Author(s) -
Vandenborre H.,
Stals L.,
Nihoul J.
Publication year - 1969
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.19690350254
Subject(s) - rhenium , irradiation , fluence , annealing (glass) , analytical chemistry (journal) , electrical resistivity and conductivity , materials science , tungsten , neutron , radiochemistry , neutron flux , osmium , chemistry , metallurgy , nuclear physics , physics , chromatography , quantum mechanics , biochemistry , ruthenium , catalysis
The recovery of rhenium after neutron irradiation at ≈ 390 °K has been studied up to 1130 °K by means of electrical resistivity measurements at 4.2 °K. Two irradiations were performed in the BR2 reactor at Mol: one up to a fluence of 7.6 × 10 −18 n cm −2 (thermal) and 4.3 × 10 17 n cm −2 (fast, E > 1 MeV) and the other one up to a fluence of 3.2 × 10 19 n cm −2 (thermal) and 1.8 × 10 18 n cm −2 (fast, E > 1 MeV). The irradiation induced resistivity is only partially recovered at 1130 °K, where the annealing of defects is supposed to be complete. This effect is attributed to the transmutation of rhenium into osmium and tungsten. The annealing spectrum between 400 and 1130 °K consists of several peaks, the main peak occurring at about 650 °K (0.19 T m ) preceded by a subpeak at about 620 °K. The latter one is more clearly resolved for the lower irradiation dose. This is also the case for the minor peaks occurring at about 490 and 540 °K. Towards higher temperature continuous recovery occurs in the temperature interval 800 to 1000 °K, whereas a small annealing stage has been observed at about 0.32 T m . The 0.19 T m stage shows a peak shift towards lower temperatures for higher defect concentration. It is believed that this stage corresponds to stage III of the pure f.c.c. metals.