THERMAL EXPANSION OF URANIUM DIOXIDE. Final Report | Zendy

F. A. Halden | Zendy; H C Wohlers | Zendy; R H Reinhart | Zendy

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THERMAL EXPANSION OF URANIUM DIOXIDE. Final Report

Author(s) -

F. A. Halden,

H C Wohlers,

R H Reinhart

Publication year - 1959

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/4169437

Subject(s) - uranium dioxide , thermal expansion , vaporization , melting point , uranium , quenching (fluorescence) , materials science , analytical chemistry (journal) , allotropy , atmospheric temperature range , mineralogy , chemistry , thermodynamics , phase diagram , physics , metallurgy , optics , composite material , phase (matter) , fluorescence , organic chemistry , chromatography

The thermal expansions of commercial uranium dioxide specimens were measured up to the melting point. The linear expansion of dense, normal grain size UO/sub 2/ follows closely the equationi L = L/sub 0/(1 + 6.0 x 10/sup -6/t + 2.0 x 10/sup -9/t/sup 1.7 x 10/sup -12/t/sup 3/). An anomalous expansion was noted in the temperature range 1000 to 1500 deg C. Above 2500 deg C the rapid vaporization and crystal growth of UO/sub 2/ necessitate the application of heating techniques which provide rapid heating and quenching in order to obtain reliable data. The use of solar and arcmelting furnaces for this type of measurement is described. (auth

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