Structural study by X-ray diffraction, magnetic susceptibility and Mössbauer spectroscopy of the Na₂Mn_{2(1 − x)}Cd_2xFe(PO₄)₃ (0 ≤ x ≤ 1) solid solution

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

1 Matériaux Inorganiques
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Na₂Mn_{2(1 − x)}Cd_2xFe(PO₄)₃ (0 ≤ x ≤ 1) phosphates were prepared by solid state reaction and characterized by powder X-ray diffraction, magnetic susceptibility and Mössbauer spectroscopy. The X-ray diffraction patterns indicated the formation of a continuous solid solution which crystallizes in the alluaudite structural type characterized by the general formula X(2)X(1)M(1)M(2)₂(PO₄)₃. The cation distribution, deduced from a structure refinement of the x = 0, 0.5 and 1 compositions, is ordered in the X(2) sites and disordered in the remaining X(1), M(1) and M(2) sites. The magnetic susceptibility study revealed an antiferromagnetic behaviour of the studied compounds. The ⁵⁷Fe Mössbauer spectroscopy confirmed the structural results and proved the exclusive presence of Fe³⁺ ions.

Mots clés: Phosphate; X-ray diffraction; Magnetic susceptibility; Mössbauer spectroscopy

Domaines: Matériaux

Mourad Hidouri, Alain Wattiaux, Léopold Fournès, Jacques Darriet, Mongi Ben Amara. Structural study by X-ray diffraction, magnetic susceptibility and Mössbauer spectroscopy of the Na₂Mn_{2(1 − x)}Cd_2xFe(PO₄)₃ (0 ≤ x ≤ 1) solid solution. Comptes Rendus. Chimie, 2011, 14 (10), pp.904-910. ⟨10.1016/j.crci.2011.04.002⟩. ⟨hal-00634933⟩