Title: Laser melting of nano-crystalline uranium dioxides
Authors: CAPPIA FABIOLAJOVANI ABRIL RaquelSPINO JOSE LUISLUZZI LelioJANSSEN ARNEMANARA Dario
Citation: PROGRESS IN NUCLEAR ENERGY vol. 72 p. 11 - 16
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2014
JRC N°: JRC84272
ISSN: 0149-1970
URI: http://www.sciencedirect.com/science/article/pii/S0149197013002126
http://publications.jrc.ec.europa.eu/repository/handle/JRC84272
DOI: 10.1016/j.pnucene.2013.10.018
Type: Articles in periodicals and books
Abstract: 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.
JRC Directorate:Nuclear Safety and Security

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