Crystal structure, Mössbauer spectroscopy, and magnetic properties of a new potassium iron oxyphosphate K11Fe15(PO4)18O related to the Langbeinite-like compounds

• Published in: Journal of alloys and compounds Vol. 361; no. 1-2; pp. 77 - 83
• Main Authors: LAJMI, B, HIDOURI, M, WATTIAUX, A, FOURNES, L, DARRIET, J, BEN AMARA, M
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier 27-10-2003
• Subjects: Chemical Sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Inorganic compounds; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Material chemistry; Mossbauer effect; other γ-ray spectroscopy; Mössbauer effect; other γ-ray spectroscopy; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Cubic lattices; Moessbauer effect; Inorganic compounds; Transition element compounds; Curie-Weiss law; Antiferromagnetic materials; Magnetic measurements; XRD; Experimental study; Lattice parameters; Magnetic susceptibility; Monocrystals; Transition metal compounds; Mössbauer spectroscopy; Crystallographic site; Iron phosphates; Neel temperature; Potassium phosphates; Quaternary compounds; Crystal growth from melts; Crystal structure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(03)00412-2

new potassium iron phosphate K11Fe15(PO4)18O has been synthesized by the flux method and characterized by single-crystal X-ray diffraction. The compound crystallizes in the cubic system with the space group P213 and the cell parameter a=9.917(2) Å. The unit cell contains one formula unit K7.33Fe10(PO4)12O0.66. The structure is closely related to that of the Langbeinite-like compounds, the main difference being the existence of a four-coordinated iron atom in the structure of the oxyphosphate. K11Fe15(PO4)18O adopts a complex three-dimensional network involving corner- and edge-linkage between iron polyhedra, and corner-sharing between phosphorus tetrahedra and iron polyhedra...