AI Article Synopsis
- A new in situ measurement technique for studying metal/metal-oxide mixtures at extreme temperatures (over 2000 K) was developed to enhance nuclear safety engineering.
- The researchers successfully conducted simultaneous XAFS-XRD measurements to track Zr oxidation and the ZrO-YO reaction over a range of temperatures (up to 2519 K), revealing significant chemical shifts.
- The study also explored the temperature effects on local structure dynamics, comparing experimental data with theoretical models, and proposed potential applications for analyzing nuclear fuel materials like UO-Zr.
Article Abstract
The in situ measurement technique for a metal/metal-oxide mixture at extra-high temperature above 2000 K has been desired in the field of nuclear safety engineering. In the present study, we succeeded in simultaneous XAFS-XRD measurements of the Zr oxidation [Zr + O → Zr(O) + ZrO] up to 1952 K and ZrO-YO reaction from 1952 to 2519 K. The chemical shift during Zr oxidation was observed in the absorption spectra around the Zr K-edge, and the interatomic cation-cation and cation-oxygen distances obtained by the fitting analysis of EXAFS during the YO-ZrO reaction are explained. Also, the temperature dependency of the anharmonic effect was investigated by comparing the fitted second- and third-order cumulants with the theoretical ones in which the Morse potential was applied as an interatomic potential, giving a good explanation about the local structure dynamics. Finally, the applicability of the developed system to investigation of nuclear fuel materials, such as UO-Zr, is discussed.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11226155 | PMC |
| http://dx.doi.org/10.1107/S1600577524003321 | DOI Listing |
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