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The behavior of uranium oxide-silica, zirconia-alumina, zirconia-iron oxide, uranium oxideiron oxide, zirconia-alumina-iron oxide, and uranium oxide-iron oxide-zirconia melts was experimen tally investigated in the air. The existence of two phase fluids in these systems was confirmed. It is proposed that the reason for the phase separation is the formation of complexes with the general formula x[M 3+ O 8/2 ] [Me 4+ O 8/2 ]. The influence of a complex concentration on the density and surface tension of melts in the ZrO 2 -Al 2 O 3 system was demonstrated.

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