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- W4288281723 abstract "Following nuclear decay, a daughter atom in a solid will stay in place if the recoil energy is less than the threshold for displacement. At high temperature, it may subsequently undergo long-range diffusion or some other kind of atomic motion. In this paper, motion of 111Cd tracer probe atoms is reconsidered following electron-capture decay of 111In in the series of In3R phases (R= rare-earth). The motion produces nuclear relaxation that was measured using the method of perturbed angular correlation. Previous measurements along the entire series of In3R phases appeared to show a crossover between two diffusional regimes. While relaxation for R= Lu-Tb is consistent with a simple vacancy diffusion mechanism, relaxation for R= Nd-La is not. More recent measurements in Pd3R phases demonstrate that the site-preference of the parent In-probe changes along the series and suggests that the same behavior occurs for daughter Cd-probes. The anomalous motion observed for R= Nd-La is attributed to lanthanide expansion occurring towards La end-member phases. For In3La, the Cd-tracer is found to jump away from its original location on the In-sublattice in an extremely short time, of order 0.5 ns at 1000 K and 1.2 ms at room temperature, a residence time too short to be consistent with defect-mediated diffusion. Several scenarios that can explain the relaxation are presented based on the hypothesis that daughter Cd-probes first jump to neighboring interstitial sites and then are either trapped and immobilized, undergo long-range diffusion, or persist in a localized motion in a cage." @default.
- W4288281723 created "2022-07-28" @default.
- W4288281723 creator A5018384194 @default.
- W4288281723 date "2019-07-16" @default.
- W4288281723 modified "2023-09-29" @default.
- W4288281723 title "Atom motion in solids following nuclear transmutation" @default.
- W4288281723 doi "https://doi.org/10.48550/arxiv.1907.07264" @default.
- W4288281723 hasPublicationYear "2019" @default.
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