title: Cs(10)Ta(29.27)o(78).
abstract: Single crystals of caesium tantalate(V), Cs(10)Ta(29.27)O(78), were obtained as a serendipitous product in a welded tantalum ampoule by a blank reaction of CsBr and bis-muth subnitrate [Bi(5)O(OH)(9)(NO(3))(4)] with the container material. The crystal structure of the title compound is made up of a three-dimensional framework constituted by two types of layers, viz. (Ta(6)O(15))(n) and (Ta(3)O(9))(n), parallel to (001), which are linked together by TaO(6) octa-hedra (3m. symmetry) along [001]. This framework has cavities where three independent Cs(+) ions (3m. and m2 symmetry, respectively) are located. The compound reveals a Ta deficiency at one trigonal prismatic coordinated site (m2 symmetry). The composition of the title compound was verified by energy-dispersive X-ray analysis of single crystals.
authors.affiliation: Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Lehrstuhl für Anorganische Festkörperchemie, Butenandtstrasse 5-13, D-81377 München, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Zeuner
authors.forename: Alexander
authors.initials: A
authors.lastname: Hofer
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schnick