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Advances in measurements of the melting transition in non-stoichiometric UO2
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UNSPECIFIED (2004) Advances in measurements of the melting transition in non-stoichiometric UO2. In: 15th Symposium on Thermophysical Properties, Univ Colorado, BOULDER, CO, JUN 22-27, 2003. Published in: INTERNATIONAL JOURNAL OF THERMOPHYSICS, 25 (2). pp. 533-545. ISSN 0195-928X.
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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) | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TJ Mechanical engineering and machinery |
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Journal or Publication Title: | INTERNATIONAL JOURNAL OF THERMOPHYSICS | ||||
Publisher: | KLUWER ACADEMIC/PLENUM PUBL | ||||
ISSN: | 0195-928X | ||||
Official Date: | March 2004 | ||||
Dates: |
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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 |
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