Raman and X‐ray Studies of Uranium–Lanthanum‐Mixed Oxides Before and After Air Oxidation. Issue 7 (26th March 2015)

• Record Type: Journal Article
• Authors: Talip, Zeynep; Wiss, Thierry; Raison, Philippe E.; Paillier, Jérôme; Manara, Dario; Somers, Joseph; Konings, Rudy J.M.; Besmann, T.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 7(2015)
• Page Start: 2278
• Page End: 2285
• Publication Date: 2015-03-26
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13559
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13559-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>UO₂ 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 UO₂ 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 UO₂ 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 M₄O₉ (M: U, La) phase increased with increasing content of La, whereas inhibition for the formation of M₃O₈ phase was observed.</p> </abstract>