Title: Thermal Conductivity of Uranium Dioxide up to 2900 K from Simultaneous Measurement of the Heat Capacity and Thermal Diffusivity.
Citation: Journal of Applied Physics vol. 85 no. 2 p. 776-789
Publication Year: 1999
JRC N°: JRC17241
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC17241
Type: Articles in periodicals and books
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 precision 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 lambda transition (2700 K), whilst the inverse of the thermal diffusivity increases linearly with temperature up to 2600 K. A new expression for the thermal conductivity as a function of temperature is proposed, which is corroborated by some theoretical considerations on the underlying heat transport mechanisms.
JRC Directorate:Nuclear Safety and Security

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