Vacancy formation energy in thorium by positron annihilation
- 1 October 1984
- journal article
- Published by IOP Publishing in Journal of Physics F: Metal Physics
- Vol. 14 (10) , 2323-2328
- https://doi.org/10.1088/0305-4608/14/10/011
Abstract
The positron annihilation peak coincidence rate has been measured in thorium from 20 to 1460 degrees C. A gradual S-shaped rise due to positron trapping at vacancies has been observed above 700 degrees C. The peak rate remained unchanged across the FCC to BCC transition at approximately=1345 degrees C, which indicates that positron trapping at vacancies is saturated at this temperature. A trapping-model analysis of the data yields a vacancy formation energy in alpha (FCC)-thorium of (1.28+or-0.23) eV.Keywords
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