Acta Crystallographica Section E (Apr 2010)

Sodium terbium(III) polyphosphate

  • Abdelghani Oudahmane,
  • Mohamed Daoud,
  • Daniel Avignant,
  • Daniel Zambon,
  • Boumediene Tanouti

DOI
https://doi.org/10.1107/S1600536810010093
Journal volume & issue
Vol. 66, no. 4
pp. i28 – i29

Abstract

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Single crystals of the title compound, NaTb(PO3)4, were obtained by solid-state reaction. This compound belongs to type II of long-chain polyphosphates with the general formula AIBIII(PO3)4. It is isotypic with the NaNd(PO3)4 and NaEr(PO3)4 homologues. The crystal structure is built up of infinite crenelated chains of corner-sharing PO4 tetrahedra with a repeating unit of four tetrahedra. These chains, extending parallel to [100], are linked by isolated TbO8 square antiprisms, forming a three-dimensional framework. The Na+ ions are located in channels running along [010] and are surrounded by six oxygen atoms in a distorted octahedral environment within a cut-off distance <2.9 Å.