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Single crystals of the title compound, CaZn 2 Fe(PO 4 ) 3 , were synthesized by conventional solid-state reaction. In the asymmetric unit, all atoms are located in fully occupied general positions of the P 2 1 / c space group. The zinc atoms are located on two crystallographically independent sites with tetra-hedral and distorted triangular-based bipyramidal geometries. Two edge-sharing triangular bipyramidal ZnO 5 units form a dimer, which is linked to slightly deformed FeO 6 octa-hedra via a common edge. The resulting chains are inter-connected through PO 4 tetra-hedra to form a layer perpendicular to the b axis. Moreover, the remaining PO 4 and ZnO 4 tetra-hedra are linked together through common vertices to form tapes parallel to the c axis and surrounding a chain of Ca 2+ cations to build a sheet, also perpendicular to the b axis. The stacking of the two layers along the b axis leads to the resulting three-dimensional framework, which defines channels in which the Ca 2+ cations are located, each cation being coordinated by seven oxygen atoms.

Synthesis and crystal structure of calcium dizinc iron(III) tris(orthophosphate), CaZn2Fe(PO4)3

Synthesis and crystal structure of calcium dizinc iron(III) tris(orthophosphate), CaZn₂Fe(PO₄)₃