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Raman and X‐ray Studies of Uranium–Lanthanum‐Mixed Oxides Before and After Air Oxidation
Author(s) -
Talip Zeynep,
Wiss Thierry,
Raison Philippe E.,
Paillier Jérôme,
Manara Dario,
Somers Joseph,
Konings Rudy J.M.
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13559
Subject(s) - raman spectroscopy , lanthanum , lanthanum oxide , uranium , x ray crystallography , analytical chemistry (journal) , oxide , materials science , doping , oxygen , chemistry , inorganic chemistry , nuclear chemistry , diffraction , metallurgy , physics , organic chemistry , chromatography , optics , optoelectronics
UO 2 samples doped with 6, 11, 22 mol% lanthanum were examined before and after air oxidation. To verify the formation of uranium–lanthanum‐mixed oxide solid solutions, powder X‐ray diffraction ( XRD ) analyses of the crystalline phases in the materials were carried out. The presence of oxygen vacancies in the La‐doped UO 2 samples was identified by Raman spectrometry. It was evidenced by changes induced in the Raman spectra by air oxidation. This latter was carried out either by increasing the Raman laser power or by thermally treating the samples at 500 K for 370 h. In addition, oxidation behavior differences of pure and La‐doped UO 2 samples were reported by comparing XRD and Raman results of the samples before and after air oxidation. It was shown that the concentration of the M 4 O 9 (M: U, La) phase increased with increasing content of La, whereas inhibition for the formation of M 3 O 8 phase was observed.