1. Langbeinite-related K2FeSn(PO4)3 fromsingle-crystal data.
- Author
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Zatovsky, Igor V., Yatskin, Michael M., Baumer, Vyacheslav N., Slobodyanik, Nikolay S., and Shishkin, Oleg V.
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IRON , *ATOMS , *TIN , *CRYSTALLIZATION , *SYMMETRY (Physics) - Abstract
Crystals of dipotassium iron(III) tin(IV) tris(orthophosphate) were grown from a self-flux in the system K2O-P2O5-Fe2O3-SnO2. The title compound is isotypic with the mineral langbeinite, K2Mg2(SO4)3. Its three-dimensional [M2(PO4)3]∞ framework is composed of [MO6] (M = Sn, Fe) octahedra and [PO4] tetrahedra interlinked via vertices. In comparison with the previous refinement from X-ray powder data [Aatiq, Haggouch, Bakri, Lakhdar & Saadoune. (2006). Powder Diffr. 21, 214-219], the present reinvestigation from single-crystal data allows a more precise determination of the distribution of the Fe and Sn atoms over two crystallographic positions and a revision of the P-O and M-O [M = K, (Fe, Sn)] bond lengths. For the two K+ cations, two different polyhedra with coordination numbers of 9 and 12 are observed. The (Fe, Sn) and K atoms are located on three-fold axes. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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