Abstract
The effect of the properties of ThO2 and (U, Th)O2 powders, prepared with different technological regimes, on the properties of the finished items is investigated. The work includes detailed investigations of ThO2 and (U, Th)O2 powders (x-ray phase analysis, electron-microscope investigation) and sintered fuel pellets (determination of density, study of microstructure, thermophysical investigations). The temperature dependences of the crystal lattice parameters and the sizes of the crystallites in ThO2 and (U, Th)O2 powders with different UO2:ThO2 ratio are obtained. The temperature dependences of the thermal conductivity of sintered ThO2 and (U, Th)O2 pellets with different UO2:ThO2 ratio are studied.
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