Acta Crystallographica Section E (Feb 2009)

Cs10Ta29.27O78

  • Wolfgang Schnick,
  • Alexander Hofer,
  • Martin Zeuner

DOI
https://doi.org/10.1107/S1600536809002967
Journal volume & issue
Vol. 65, no. 2
pp. i12 – i12

Abstract

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Single crystals of caesium tantalate(V), Cs10Ta29.27O78, were obtained as a serendipitous product in a welded tantalum ampoule by a blank reaction of CsBr and bismuth subnitrate [Bi5O(OH)9(NO3)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. (Ta6O15)n and (Ta3O9)n, parallel to (001), which are linked together by TaO6 octahedra (3m. symmetry) along [001]. This framework has cavities where three independent Cs+ ions (3m. and overline{6}m2 symmetry, respectively) are located. The compound reveals a Ta deficiency at one trigonal prismatic coordinated site (overline{6}m2 symmetry). The composition of the title compound was verified by energy-dispersive X-ray analysis of single crystals.