Crystal structure of disodium dicobalt(II) iron(III) tris­(orthophosphate) with an alluaudite-like structure

Acta Crystallographica Section E: Crystallographic Communications

Makani, T.¹  Saadi, M.³  El Ammari, L.⁴  Bouraima, A.⁵  Assani, A.⁶ 

[1] Mohammed V, Avenue Ibn Battouta, BP 1014, Rabat, Morocco;des Sciences et Techniques de Masuku, BP 943, Franceville, Gabon;des Sciences, UniversitéDéLaboratoire de Chimie du Solide Appliquée, Facultépartement de chimie, Faculté

关键词: CRYSTAL STRUCTURE;    TRANSITION METAL PHOSPHATES;    SOLID-STATE REACTION SYNTHESIS;    NA2CO2FE(PO4)3;    ALLUAUDITE-LIKE STRUCTURE;   

DOI  :  10.1107/S2056989015007926

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

The title compound, Na2Co2Fe(PO4)3, was synthesized by a solid-state reaction. This new stoichiometric phase crystallizes in an alluaudite-like structure. In this structure, all atoms are in general positions except for four atoms which are located at the special positions of the C2/c space group. One Co atom, one P and one Na atom are all located on Wyckoff position 4e (2), while the second Na atom is located on an inversion centre 4a (-1). The other Co and Fe atoms occupy a general position with a statistical distribution. The open framework results from [(Co,Fe)2O10] units of edge-sharing [(Co,Fe)O6] octa­hedra, which alternate with [CoO6] octa­hedra that form infinite chains running along the [10-1] direction. These chains are linked together through PO4 tetra­hedra by the sharing of vertices so as to build layers perpendicular to [010]. The three-dimensional framework is accomplished by the stacking of these layers, leading to the formation of two types of tunnels parallel to [010] in which the Na+ cations are located, each cation being surrounded by eight O atoms.

【 授权许可】

CC BY