Abstract
Phase relations in the system: CaO-TiO2-SiO2-(Na2O,Al2O3,Gd2O3,UO2) were studied. This system is of interest due to the formation of sphene, perovskite, and other phases potentially suitable for immobilization of high level waste (HLW) elements. Along with sphene, other phases found in the samples were rutile, chevkinite, anorthite, crystobalite, and pyrochlore-structured phases. Sphene is able to incorporate up to 21.5 wt.% Gd2O3 and 9.3 wt.% UO2 or, in formula units: 0.25 Gd and 0.07 U.
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