UNSPECIFIED (2004) Advances in measurements of the melting transition in non-stoichiometric UO2. In: 15th Symposium on Thermophysical Properties, JUN 22-27, 2003, Univ Colorado, BOULDER, CO.

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Abstract

This work presents a study of the melting behavior of the UO2+x system. Self-crucible pulsed-laser melting at high pressure is realized, further improving the recently developed experimental approach. Thermograms of the heated surface of the sample, recorded by a fast pyrometer, show thermal arrests and/or points of inflection corresponding to the phase transformations. A further probe laser beam is focused onto and reflected by the sample surface, and the reflected light intensity is used to detect the exact instants at which melting/freezing transitions occur. Furthermore, a model was developed describing the complex process of laser-induced melting in a system where a solubility gap accompanies the formation of liquid, and a corresponding numerical simulation of the melting-freezing process was performed in order to depict the heat and matter transport phenomena involved. Finally, liquidus and solidus lines are proposed for the system UO2+x in the range 0 less than or equal to x less than or equal to 0.21.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QC Physics Q Science > QD Chemistry T Technology > TJ Mechanical engineering and machinery
Journal or Publication Title:	INTERNATIONAL JOURNAL OF THERMOPHYSICS
Publisher:	KLUWER ACADEMIC/PLENUM PUBL
ISSN:	0195-928X
Date:	March 2004
Volume:	25
Number:	2
Number of Pages:	13
Page Range:	pp. 533-545
Publication Status:	Published
Title of Event:	15th Symposium on Thermophysical Properties
Location of Event:	Univ Colorado, BOULDER, CO
Date(s) of Event:	JUN 22-27, 2003
URI:	http://wrap.warwick.ac.uk/id/eprint/8398

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