An unusual O^2-/F^- distribution in the new pyrochlore oxyfluorides: Na₂B₂O₅F₂ (B = Nb, Ta)

Edouard Boivin (1) , Frédérique Pourpoint (1) , Sébastien Saitzek (2) , Pardis Simon (1) , Pascal Roussel (1) , Houria Kabbour (1)

1 UCCS - Unité de Catalyse et Chimie du Solide - UMR 8181
2 UCCS Équipe Couches Minces & Nanomatériaux

Two new oxyfluorides with a pyrochlore-type structure, Na₂Nb₂O₅F₂ and Na₂Ta₂O₅F₂, have been obtained and for which the XRD crystallographic study coupled with ¹⁹F solid state NMR reveals an unusual O/F distribution. Both materials are n-type semiconductors exhibiting photoconductive properties.

Domains: Material chemistry; Cristallography

Edouard Boivin, Frédérique Pourpoint, Sébastien Saitzek, Pardis Simon, Pascal Roussel, et al.. An unusual O^2-/F^- distribution in the new pyrochlore oxyfluorides: Na₂B₂O₅F₂ (B = Nb, Ta). Chemical Communications, 2022, 58 (14), pp.2391-2394. ⟨10.1039/D1CC06760E⟩. ⟨hal-03631161⟩