Raman spectroscopic study of the structural change of uranium–thorium-mixed oxides before and after oxidation

Raman spectroscopic study of the structural change of uranium–thorium-mixed oxides before and after oxidation

UO 2 pellets doped with 1, 5 and 10 mol% Th before and after oxidation were analyzed by using Raman spectroscopy to investigate the Th doping effect on the structural changes during oxidation of UO 2 . While the Raman spectra of all sample pellets showed a close-to-perfect fluorite structure before...

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Veröffentlicht in:Journal of radioanalytical and nuclear chemistry 2018-06, Vol.316 (3), p.1295-1300
Hauptverfasser: Lee, Jeongmook, Kim, Jandee, Youn, Young-Sang, Kim, Jong-Yun, Lim, Sang Ho
Format: Artikel
Sprache:eng
Schlagworte:
Carbon dioxide
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Doping
Fluorite
Hadrons
Heavy Ions
Inorganic Chemistry
Mixed oxides
Nuclear Chemistry
Nuclear energy
Nuclear Physics
Oxidation
Oxidation-reduction reactions
Oxides
Pellets
Physical Chemistry
Raman spectra
Raman spectroscopy
Spectrum analysis
Thorium
Uranium
Uranium dioxide
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Zusammenfassung:UO 2 pellets doped with 1, 5 and 10 mol% Th before and after oxidation were analyzed by using Raman spectroscopy to investigate the Th doping effect on the structural changes during oxidation of UO 2 . While the Raman spectra of all sample pellets showed a close-to-perfect fluorite structure before oxidation, those of oxidized (U 1− y Th y )O 2+ x (0.03 ≤  x  ≤ 0.06) pellets showed distinct defect structures after oxidation at 1150 °C with CO/CO 2  = 0.001. The increasing relative ratio of first-order longitudinal optical modes of (U 1− y Th y )O 2+ x with increasing doping levels should represent the defect structure due to the Th doping effect.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-018-5829-x