Crystal structure of strontium dinickel iron orthophosphate

Acta Crystallographica Section E: Crystallographic Communications

El Ammari, L.¹  Saadi, M.²  Ouaatta, S.³  Assani, A.⁴ 

[1] Mohammed V, Avenue Ibn Battouta, BP 1014, Rabat, Morocco;des Sciences, UniversitéLaboratoire de Chimie du Solide Appliquée, Faculté

关键词: CRYSTAL STRUCTURE;    TRANSITION METAL PHOSPHATES;    SOLID-STATE REACTION SYNTHESIS;    SRNI2FE(PO4)3;    [ALPHA]-CHROMIUM PHOSPHATE;   

DOI  :  10.1107/S205698901501779X

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

The title compound, SrNi2Fe(PO4)3, synthesized by solid-state reaction, crystallizes in an ordered variant of the α-CrPO4 structure. In the asymmetric unit, two O atoms are in general positions, whereas all others atoms are in special positions of the space group Imma: the Sr cation and one P atom occupy the Wyckoff position 4e (mm2), Fe is on 4b (2/m), Ni and the other P atom are on 8g (2), one O atom is on 8h (m) and the other on 8i (m). The three-dimensional framework of the crystal structure is built up by [PO4] tetra­hedra, [FeO6] octa­hedra and [Ni2O10] dimers of edge-sharing octa­hedra, linked through common corners or edges. This structure comprises two types of layers stacked alternately along the [100] direction. The first layer is formed by edge-sharing octa­hedra ([Ni2O10] dimer) linked to [PO4] tetra­hedra via common edges while the second layer is built up from a strontium row followed by infinite chains of alternating [PO4] tetra­hedra and FeO6 octa­hedra sharing apices. The layers are held together through vertices of [PO4] tetra­hedra and [FeO6] octa­hedra, leading to the appearance of two types of tunnels parallel to the a- and b-axis directions in which the Sr cations are located. Each Sr cation is surrounded by eight O atoms.

【 授权许可】

CC BY