STRUCTURE OF CUBIC YbZrF7.

Article abstract of DOI:10.1016/0022-4596(81)90266-8

The structure of primitive-cubic YbZrF//7 has been determined using X-ray and neutron diffraction techniques. A unit cell (a equals 4. 07 A, space group Pm3m) contains one formula unit of Yb//0//. //5Zr//0//. //5F//3//. //5, with no ordering of cations, in materials prepared by rapid quenching from 1000 degree C. Metal and fluorine displacements from ideal sites are in accord with results previously obtained on Zr//0//. //8Yb//0//. //2F//3//. //2O//0//. //3. The separation between F-F pairs bridging neighboring metal ions is similar to those observed in other complex zirconium fluorides. The metal displacements, metal-fluorine distances and fluorine-fluorine distances are discussed with respect to the formation and stability of disordered fluorine-excess ReO//3-type phases.