The reduction of UO2F2 by dry H-2 was studied by Controlled Rate EGA, with
a special set-up operating under a gas flow under atmospheric pressure. At
the constant transformation rate selected, this reduction apparently takes
place in one main step, around 450 degrees C (for a total duration of 100 h
), followed by a small exothermic step. The final product is a stoichiometr
ic, well crystallized UO2. XRD analysis shows the occurrence of two success
ive intermediates of which one has a structure close to that of UO2, but wi
th interstitial fluorine atoms.