title: Redetermination of Na(3)TaF(8).
abstract: The crystal structure of trisodium octafluoridotantalate, Na(3)TaF(8), has been redetermined using diffractometer data collected at 153 K, resulting in more accurate bond distances and angles than obtained from a previous structure determination based on film data. The structure is built from layers running along [101], which are formed by distorted [TaF(8)] antiprisms and [NaF(6)] rectangular bipyramids sharing edges and corners. The individual layers are separated by eight-coordinated Na ions. Two atoms in the asymmetric unit are in special positions: the Ta atom is on a twofold axis in Wyckoff position 4e and one of the Na ions lies on an inversion centre in Wyckoff site 4d.
authors.affiliation: Environmental Inorganic Chemistry, Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. langer@chalmers.se
authors.forename: Vratislav
authors.initials: V
authors.lastname: Langer
authors.forename: Lubomír
authors.initials: L
authors.lastname: Smrcok
authors.forename: Miroslav
authors.initials: M
authors.lastname: Boca