In situ XAFS-XRD study of the Zr-Y2O3 interaction at extra-high temperatures.
J Synchrotron Radiat
; 31(Pt 4): 810-820, 2024 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-38819844
ABSTRACT
The in situ measurement technique for a metal/metal-oxide mixture at extra-high temperature above 2000â
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 â Zr(O) + ZrO2] up to 1952â
K and ZrO2-Y2O3 reaction from 1952 to 2519â
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 Y2O3-ZrO2 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 UO2-Zr, is discussed.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Synchrotron Radiat
Assunto da revista:
RADIOLOGIA
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
Japão