Low-Temperature Oxidation of Fine UO2 Powders: A Process of Nanosized Domain Development

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Abstract

The nanostructure and phase evolution in low-temperature oxidized (40−250 °C), fine UO2 powders ( 1) were observed. Oxidation involves formation of higher uranium oxides in nanodomains near the grain surface which, initially, have a disordered defect structure (“disordered U4O9”). As oxidation progresses, domain growth increases and the longperiod modulated structure of U4O9 develops (“ordered U4O9”). A similar mechanism is understood to happen also in U3O7−z.

Details

Original languageEnglish
Pages (from-to)3915-3927
JournalInorganic Chemistry
Volume55
DOIs
Publication statusPublished - 25 Mar 2016

Keywords

  • uranium dioxide, oxidation, X-ray diffraction, transmission electron microscopy, thermal analysis

ID: 1464353