Stage III annealing in gold after electron irradiation
Lee, Choochon
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https://hdl.handle.net/2142/25729
Description
Title
Stage III annealing in gold after electron irradiation
Author(s)
Lee, Choochon
Issue Date
1968
Doctoral Committee Chair(s)
Koehler, James S.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
stage III annealing
gold
electron irradiation
slope change method
Primak analysis
Language
en
Abstract
Gold specimens of nominal 99.9999% purity were irradiated
with 3 MeV electrons near liquid nitrogen temperature. The
damage production rate is found to depend on the purity of the
specimen giving a lower value for the high purity specimens.
It is also found that the production rate is reduced remarkably
by quenching the specimen before irradiation. For high purity
gold, a single large annealing peak is observed in Stage III.
The slope change method and Primak analysis are employed to
obtain the activation energy of Stage III annealing. Both
methods give 0.85 ± 0.02 eV for the activation energy in high
purity irradiated specimens. The activation energies for
quenched, and quench-plus-irradiated specimens of comparable
purity are found to be 0.85 + 0.03 eV and 0.86 + 0.02 eV
respectively, agreeing with the value for the irradiated
specimens within the experimental error. Somewhat lower
values are obtained for specimens of lower purity. Second
order kinetics are obeyed in the main part of the Stage III
annealing for the irradiated, quench-pius-irradiated and
quenched specimens. Various models are discussed to
explain Stage III annealing. It is concluded that vacancy
migration in Stage III with interstitial clusters acting as
sinks can account for the observed results most satisfactorily
in the case of gold.
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