Abstract
We report on a technique to measure self-diffusion in solids using nuclear resonant scattering (NRS) of synchrotron radiation: By scattering in Bragg directions we gain access to brittle samples, which cannot be prepared as thin foils as required for transmission experiments. The intermetallic alloy ${\mathrm{Fe}}_{3}\mathrm{Si}$ was investigated in order to demonstrate the feasibility of a nontransmission NRS experiment to measure diffusion in nonperfect single crystals. Even though the modeling of the scattering from nonperfect crystals is a difficult task, the shape of the time spectra of nuclear-scattered quanta from our sample could be successfully approximated with a simple model. The diffusion effect, which manifests itself as an ``accelerated decay'' of the intensity in the time spectra, was observed and the diffusion parameters were obtained.
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