Th Symmetry in the Rare-Earth Double Nitrates

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Abstract
The symmetry of the crystal field about the rare‐earth ion in the rare‐earth double nitrates is known to be C3. While the major groupings of the crystal‐field levels in the optical spectra may be understood by assuming the crystal‐field symmetry is icosahedral, the structure within these groups can be explained by assuming an approximate symmetry of Th with a small distortion to C3. Tentative crystal‐field parameters for Th symmetry are obtained for Nd2Mg3(NO3)12·24H2O and Ce2Mg3(NO3)12·24H2O.

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