Acta Crystallographica Section E (Jul 2014)

The solid solution K3.84Ni0.78Fe3.19(PO4)5

  • Nataliia Yu. Strutynska,
  • Ivan V. Ogorodnyk,
  • Oksana V. Livitska,
  • Vyacheslav N. Baumer,
  • Nikolay S. Slobodyanik

DOI
https://doi.org/10.1107/S1600536814013609
Journal volume & issue
Vol. 70, no. 7
pp. i39 – i40

Abstract

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The title compound, tetrapotassium tetra[nickel(II)/iron(III)] pentakis(orthophosphate), K3.84Ni0.78Fe3.19(PO4)5, has been obtained from a flux. The structure is isotypic with that of K4MgFe3(PO4)5. The three-dimensional framework is built up from (Ni/Fe)O5 trigonal bipyramids with a mixed Fe:Ni occupancy of 0.799 (8):0.196 (10) and isolated PO4 tetrahedra, one of which is on a general position and one of which has -4.. site symmetry. Two K+ cations are statistically occupied and are distributed over two positions in hexagonally shaped channels that run parallel to [001]. One K+ cation [occupancy 0.73 (3)] is surrounded by nine O atoms, while the other K+ cation [occupancy 0.23 (3)] is surrounded by eight O atoms.