MAGNETIC-PROPERTIES OF URANIUM COMPLEX OXIDES

Magnetic properties of ternary uranium oxides with the fluorite-type structure or the perovskite-type structure are summarized to discuss the behavior of 5f electrons in solids. The magnetic susceptibility data for M(y)U1-yO2+x solid solutions (M=rare earth ion, alkaline earth ion) with the fluorite-type structure are reviewed and the charge transfer phenomena found in Ce(y)U1-yO2 solid solutions are discussed. The magnetic susceptibility and the electron paramagnetic resonance (EPR) data for MUO3 (M=alkali metal ion) and the ordered perovskites Ba2MUO6 (M=rare earth ion, transition metal ion, alkaline earth ion) are reviewed. The magnetic exchange interactions between uranium ions at low temperatures and the g-value for EPR are discussed, and the critical distance between uranium ions is derived.