Preparation, structural characterization and Mössbauer study of the CuFe1−xVxO2 (0 < x < 0.67) delafossite-type solid solution

Khadija El Ataoui (1) , Jean-Pierre Doumerc (2) , Abdelaziz Ammar (1) , Pierre Gravereau (2) , Léopold Fournès (2) , Alain Wattiaux (2) , Michel Pouchard (2)

1 Laboratoire de Chimie des Matériaux Solides
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The stability of trivalent M cations in CuMO2 delafossites is reviewed in terms of redox equilibrium. Whereas CuVO2 does not exist, a CuFe1−xVxO2 (0 < x < 0.67) solid solution was synthesized from metals and binary oxides. Mössbauer resonance unambiguously showed that iron and hence vanadium atoms are trivalent, which was not a priori expected. Of course, the vanadium concentration is limited, in agreement with the reasons explaining the inexistence of CuVO2 in terms of a too strong reducing power of V3+.

Mots clés: Delafossite oxide; Redox equilibrium; Mössbauer resonance; Copper iron(III) vanadium(III) oxide

Domaines: Matériaux

Khadija El Ataoui, Jean-Pierre Doumerc, Abdelaziz Ammar, Pierre Gravereau, Léopold Fournès, et al.. Preparation, structural characterization and Mössbauer study of the CuFe1−xVxO2 (0 < x < 0.67) delafossite-type solid solution. Solid State Sciences, 2003, 5 (9), pp.1239-1245. ⟨10.1016/S1293-2558(03)00149-3⟩. ⟨hal-00178846⟩