Crystal structure, magnetic properties and Mössbauer spectroscopy of NaCaFe3(PO4)4

Mourad Hidouri (1) , Besma Lajmi (1) , Alain Wattiaux (2) , Léopold Fournès (2) , Jacques Darriet (2) , Mongi Ben Amara (1)

1 Laboratoire de Chimie Structurale des Matériaux, Département de Chimie
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

A new sodium and calcium iron phosphate, NaCaFe3(PO4)4, has been synthesized by a flux method and characterized by single crystal X-ray diffraction, magnetic susceptibility and Mössbauer spectroscopy. The compound crystallizes in the orthorhombic space group Pcab with the parameters a=8.706(4) Å, b=9.410(1) Å, c=29.211(6) Å, V=2393 Å3 and Z=8. The structure consists of discrete FeO6 octahedra and FeO5 trigonal bipyramids, corner-sharing with PO4 tetrahedra that form a [Fe3P4O16]n three-dimensional framework with two distinct cavities which are the Na+ and Ca2+ sites. Mössbauer spectroscopy results confirm those obtained from X-ray diffraction...

Mots clés: Transition metal compounds; Chemical synthesis; Crystal structure; Magnetic measurements; Mössbauer spectroscopy

Domaines: Matériaux

Mourad Hidouri, Besma Lajmi, Alain Wattiaux, Léopold Fournès, Jacques Darriet, et al.. Crystal structure, magnetic properties and Mössbauer spectroscopy of NaCaFe3(PO4)4. Journal of Alloys and Compounds, 2003, 358 (1-2), pp.36-41. ⟨10.1016/S0925-8388(03)00129-4⟩. ⟨hal-00180123⟩