Acta Crystallographica Section E: Crystallographic Communications (Feb 2017)

K1+2xNi1−xFe2(AsO4)3 (x = 0,125): un nouvel arséniate à structure de type α-CrPO4

  • Ridha Ben Smail,
  • Mohamed Faouzi Zid

DOI
https://doi.org/10.1107/S2056989017000950
Journal volume & issue
Vol. 73, no. 2
pp. 239 – 245

Abstract

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A new arsenate K1+2xNi1−xFe2(AsO4)3 (x = 1/8) {potassium nickel diiron(III) tris[arsenate(V)]} was synthesized using a flux method and its crystal structure was determined from single-crystal X-ray diffraction data. This material was also characterized by qualitative energy dispersive X-ray spectroscopy (EDS) analysis. The crystal structure belongs to the α-CrPO4-structure type, space group Imma. It consists of a three-dimensional-framework built up from FeO6 and Ni0.875□1.25O6-octahedra and AsO4-tetrahedra that are sharing corners and/or edges, generating tunnels running along the [010] and [001] directions in which the potassium cations are located. The proposed structural model was validated by bond-valence-sum calculations, charge-distribution (CHARDI) and Madelung energy analyses.

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