HIGH TEMPERATURE THERMAL EXPANSION OF UO2 AND ThO2
Technical rept. Jul 1967-Jul 1968
CINCINNATI UNIV OH
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The thermal expansion of uranium dioxide and thorium dioxide has been measured between 20 and 2100C using high temperature X-ray diffraction techniques. The thermal expansion of UO2 and ThO2 as measured by x-ray diffraction is identical to that obtained by bulk expansion measurements. Because of this, and because the specific heat of UO2 shows a rapid increase above 1700C indicating a disorder, it must be concluded that the major structural defect is a Frenkel type disorder. This probably involves the oxygen atom moving from the tetrahedral into an empty octahedral position.
- Physical Chemistry