Laser melting of nano-crystalline uranium dioxides
The present work is focused on the investigation of possible melting temperature depression of nano-crystalline UO2. The behaviour of nano-crystalline refractory oxide of this kind has been studied above 1500 K for the first time here. The technique used is based on sub-second laser heating and fast pyrometry.
Nano-crystalline UO2 with grains of (30 ± 20) nm underwent fast oxidation due to the high specific surface. The measured melting point depression (up to over 300 K below 3120 K, the melting temperature of micrometersized UO2) was thus mostly attributable to a non-negligible oxygen-to-metal molar ratio increase and, possibly, only to a much lesser extent to a real grain-size effect.
CAPPIA Fabiola;
JOVANI ABRIL Raquel;
SPINO Jose Luis;
LUZZI Lelio;
JANSSEN Arne;
MANARA Dario;
2014-09-02
PERGAMON-ELSEVIER SCIENCE LTD
JRC84272
0149-1970,
http://www.sciencedirect.com/science/article/pii/S0149197013002126,
https://publications.jrc.ec.europa.eu/repository/handle/JRC84272,
10.1016/j.pnucene.2013.10.018,
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