A new set of K3Fe3(PO4)4·yH2O (0 ≤ y ≤ 1) layered phases obtained by topotactic reactions

Khiem Trad (1, 2) , Alain Wattiaux (1) , Mongi Ben Amara (2) , Claude Delmas (1) , Dany Carlier (1)

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

K3Fe3(PO4)4·H2O powder was synthesized by Na+/K+ exchange reaction from Na3Fe3(PO4)4 in aqueous medium. The replacement of the sodium cations by the potassium larger ones and water molecules causes a structural distortion leading to P2/n monoclinic K3Fe3(PO4)4·H2O. This new layered phase was characterized by XRD, Mössbauer spectroscopy and magnetic measurements. The study of its thermal stability reveals that other new layered K3Fe3(PO4)4·yH2O with (0 ≤ y ≤ 1) phases can be stabilized up to 600 °C and finally at higher temperature a new K3Fe3(PO4)4 polymorph with a different structural type is irreversibility formed.

Mots clés: Transition metal phosphate; Layered material; Ion exchange reaction

Domaines: Matériaux; Chimie inorganique

Khiem Trad, Alain Wattiaux, Mongi Ben Amara, Claude Delmas, Dany Carlier. A new set of K3Fe3(PO4)4·yH2O (0 ≤ y ≤ 1) layered phases obtained by topotactic reactions. Journal of Solid State Chemistry, 2018, 262, pp.112-120. ⟨10.1016/j.jssc.2018.03.016⟩. ⟨hal-01760743⟩