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|Title:||Laser melting of nano-crystalline uranium dioxides|
|Authors:||CAPPIA FABIOLA; JOVANI ABRIL Raquel; SPINO JOSE LUIS; LUZZI Lelio; JANSSEN ARNE; MANARA Dario|
|Citation:||PROGRESS IN NUCLEAR ENERGY vol. 72 p. 11 - 16|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|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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