HIGHLY REFRACTORY SYSTEMS WITH LANTHANIDE AND ACTINIDE OXIDES

A discussion of ph se diagrams of highly refractory oxides with oxides of lanthanides and actinides, as found in the literature, is presented. Included are certain generalizations concerning tetravalent actinide oxide systems containing one of the following beryllium oxide, magn sium oxide, calcium oxide, aluminum o ide, zirconium oxide, silica, oxides of trivalent rare earth ele ents. Generalizations concerning oxides of trivalent rare earth elements are included. Systems with beryllium oxide are eutectic and analogous to systems with actinides. Also discussed are trivalent rare earth systems with aluminum oxides, ZrO2, S IO .