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Abstract

The thermal diffusivity and heat capacity of uranium dioxide have been measured from 500 K to 2900 K with an advanced laser-flash technique.These two quantities were determined simultaneously by means of an accurate numerical fitting of the experimental thermograms. At high temperatures the precizion of the method is much better than that associated with conventional laser-flash measurements.
It was found that the heat capacity continues to increase even at temperatures above the lambdra transition (2700 K) whilst the inverse of the thermal diffusivity increases linearly with temperature up to 2600 K.
A new exprassion for the thermal conductivity as a function of temperature is proposed, which is corroborated by some theoretical considerations on the underlaying heat transport mechanisms.

Additional information

Authors: RONCHI C, Institute for Tranuranium Elements, Karlsruhe (DE);SHEINDLIN M, Institute for Tranuranium Elements, Karlsruhe (DE);MUSELLA M, Institute for Tranuranium Elements, Karlsruhe (DE);HYLAND G J, University of Warwick (GB)
Bibliographic Reference: Article: Journal of Applied Physics
Record Number: 199910222 / Last updated on: 1999-03-12
Category: PUBLICATION
Original language: en
Available languages: en
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