Crystal Chemical Regularities in Uranium and Analogous Fluorides

摘要

Over seventy structures of uranium and analogous fluorides have been analyzed. The principal data on the forms of heavy cation coordination polyhedra and kinds of their packing in crystal lattice have been generalized. The correlation between the shortest uranium-uranium distances and the mode of polyhedra bonding have been determined for uranium and other heavy metals. The equations that permit (from the dimensions of the ions which are the components of the polyhedra) determination of the shortest interaction distances at various kinds of polyhedra packing are given. In the structures having columns or bands of polyhedra bonded through common faces or edges, respectively, the interdependence of cell dimensions and short metal - metal distances have been revealed. The analyses of intercation distances in structures with heavy multicharge cations is suggested as a new crystal chemical method for light anion localization in these structures.