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Magnetic data for ternary actinoid oxides with central ions exhibiting the (Rn)5f(n) electronic structure have been investigated to establish systematics for magnetic behaviour and/or relations between structure and magnetism. All compounds with (Rn)5f(0) central ions exhibit a temperature-independent susceptibility which is ascribed to ligand orbital admixture into the 5f orbitals. The magnetic moments of (Rn)5f(1) compounds are composed of a constant and a temperature dependent part, which are ascribed to ligand orbital admixtures and the 5f electrons, respectively. The low temperature behaviour of (Rn)5f(2n+1) compounds can be explained qualitatively by the lattice structures involved; An-O-An chains are necessary to make superexchange possible, and a certain maximum distance between the paramagnetic ions must not be exceeded.

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Authors: BICKEL M, JRC Geel (BE);KANELLAKOPULOS B, Kernforschungszentrum Karlsruhe, Institut für Heiße Chemie (DE)
Bibliographic Reference: Article: Journal of Solid State Chemistry, Vol. 107 (1993) pp. 273-284
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