Abstract
Two basic problems have long been predominant in the solution chemistry of the rare earth elements: the directional change of sequential properties at gadolinium, and the nomadic behaviour of the yttrium ion. Treatment of the ‘gadolinium break’ appears amenable to the ligand field approach, but the adoption by yttrium of a serial position differing with the nature of the menstruum has not been so classically explained. The inception of ion exchange techniques for separation of the rare earth elements has indeed tended to distract attention from this problem which was ever-present in the older classical methods of separation by fractional crystallization of precipitation.
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VICKEBY, R. Nomadic Behaviour of Yttrium Ions and their Structure in Solution. Nature 208, 678–679 (1965). https://doi.org/10.1038/208678a0
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DOI: https://doi.org/10.1038/208678a0
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