Structural study by X-ray diffraction and Mössbauer spectroscopy of a new synthetic iron phosphate: K4MgFe3(PO4)5 |
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| Authors: | Mourad Hidouri Nesrine Sendi Mongi B Amara |
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| Institution: | a UR Matériaux Inorganiques, Faculté des Sciences, 5019 Monastir, Tunisia
b Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, Université de Bordeaux I, 87 Avenue du Dr. A. Schweitzer, 33608 Pessac-Cedex, France |
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| Abstract: | A new iron phosphate K4MgFe3(PO4)5 has been synthesized by the flux method and characterized by single-crystal X-ray diffraction and Mössbauer spectroscopy. It crystallizes in the tetragonal system with the space group  and the unit cell parameters a=9.714(3) Å and c=9.494(5) Å. The crystal structure is of a new type. It exhibits a three-dimensional framework built up from corner-sharing MO5 (M=0.75Fe+0.25Mg) trigonal bipyramids and PO4 tetrahedra. The K+ ions are occupying large eight-sided tunnels running along c. A room temperature Mössbauer study confirmed the +3 valence state of iron and its five-coordination. |
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| Keywords: | A Inorganic compounds B Chemical synthesis C X-ray diffraction C Mö ssbauer spectroscopy |
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