Abstract
Uranium complex oxides with the ordered perovskite structure Ba 2 MUO 6 ( M = Sc, Y, Gd, Yb, Mn) were prepared, and their magnetic susceptibilities and electron paramagnetic resonance (EPR) spectra were measured. The lattice parameter of the compounds varied linearly with the ionic radius of M 3+. The effective magnetic moments of U 5+ in Ba 2YUO 6 and Ba 2ScUO 6 were very small. The moments of Ba 2GdUO 6 and Ba 2YbUO 6 were 7.74 and 4.69 μ B, respectively, close to the theoretical values for Gd 3+ and Yb 3+. The electron paramagnetic resonance spectrum was observed for Ba 2GdUO 6, its g-value was 1.92. In Ba 2MnUO 6, ferrimagnetic behavior was found below ca. 55 K. The effective magnetic moment was 5.52 μ B and the g -value of EPR was 2.00. These results show that the manganese ion is divalent at a high spin state and that the uranium ion is in the hexavalent state.
Published Version
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