Magnetic Properties of Uranium Complex Oxides

Abstract

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_yU_1-yO_2+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_yU_1-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.