J. M. ADAMS AND VIJAYALAKSHMI RAMDAS 3227three hydrogen bonds [indeed 0(4) Potassium ytterbium fluoride fl-KYbaF~0 is hexagonal. The unit cell, with a = 8"067 (2), ¢ = 13"203 (4) A, contains four formula units and the space group is P63mc. The crystal structure has been solved from single-crystal diffractometer data by Patterson and Fourier syntheses and refined by a least-squares method with anisotropic temperature factors. The final R value is 0.032 for 789 independent observed reflexions (Rw=0.041). The Yb atoms are surrounded by quadratic antiprisms of F atoms, and three antiprisms share two of their edges to form planar (Yb3FIs) 9-groups. These groups are three-dimensionally linked, but they form four planes which stack, perpendicular to c, in the sequence ABA'B'.The two species of K atoms are surrounded by 15 and 16 F atoms respectively. Bindings between antiprisms and polyhedra are discussed as well as analogies between the structures of KYaF~0, KYb3F~0 and fluorite.
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