Structural relationships,crystal chemistry and anion substitution processes for M(III)X3 systems of the lanthanides and actinides |
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Authors: | J.M. Haschke |
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Affiliation: | Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48104 USA |
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Abstract: | An examination of data for lanthanide and actinide phases with UCl3-type and PuBr3-type M(III)X3 structures has shown that these systems are conveniently described by alternating layers of [MX2]n+n and [X]n?n. The relationships between the UCl3- and PuBr3-type structures are described and expanded to include a variety of anion substitution systems, M(III)X3?xYx. The two different types of [MX2]n+n layers observed in these systems are consistent with the existence of a novel structural unit, [M2X4]2+. The effects of radius ratio constraints and layering mechanisms on the phase equilibria and anionic substitution processes, polymorphism and crystal growth in the MX3?xYx systems are discussed. |
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