Abstract
Uranium complex oxides with the ordered perovskite structure, Ba 3CaU 2O 9, and Ba 3SrU 2O 9, were prepared, and their magnetic susceptibilities were measured in the temperature range between 4.2 K and room temperature. No magnetic cooperative phenomenon was found down to 4.2 K. The effective magnetic moments of Ba 3CaU 2O 9 and Ba 3SrU 2O 9 were 1.24 μ B and 0.56 μ B, respectively. Electron paramagnetic resonance (EPR) measurements were carried out for these compounds, but no EPR spectra which are ascribable to the U 5+ ion in an octahedral crystal field were observed. The crystal field parameters of these compounds were determined from the analysis of the optical absorption spectra published previously. The effective moments and temperature-independent paramagnetic susceptibilities were calculated and compared with the experimental results.
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