Acta Crystallographica Section E

Structure Reports Online

Volume 61, Part 4 (April 2005)

inorganic compounds

Acta Cryst. (2005). E61, i46-i48 [ doi:10.1107/S1600536805006756 ]

(Na_0.38,Ca_0.31)MgFe₂P₃O₁₂

M. F. Zid, A. Driss et T. Jouini

Abstract: The structure of sodium calcium magnesium iron phosphate, (Na_0,38,Ca_0,31)MgFe₂P₃O₁₂, consists of an [MgFe₂(PO₄)₃]^- framework, built up by chains of edge-sharing (FeO₆-FeO₆-MgO₆) octahedra running along the [ $\overline 1$ 01] direction. The chains are linked together via the common corners of phosphate tetrahedra to form sheets parallel to the ab plane. Adjacent sheets are also connected through PO₄ tetrahedra, thus giving rise to an open framework with two different kinds of channels where the Na⁺ and Ca²⁺ cations are located.