Structural study of the NaCdVO₄–Cd₃V₂O₈ and CdO–V₂O₅ sections of the ternary system Na₂O–CdO–V₂O₅

Hamdi Ben Yahia (1) , Etienne Gaudin (1) , Cédric Féral-Martin (1) , Jacques Darriet (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The NaCdVO₄–Cd₃V₂O₈ and CdO–V₂O₅ sections of the ternary system Na₂O–CdO–V₂O₅ have been studied and the crystal structures of Cd₃V₂O₈ and Cd₁₈V₈O₃₈ compounds were determined from single-crystal X-ray diffraction data. Cd₃V₂O₈ crystallizes with the maricite-type structure in space group Pnma, a=9.8133(10) Å, b=6.9882(10) Å, c=5.3251(10) Å and Z=4, whereas Cd₁₈V₈O₃₈ crystallizes in space group P1 with a new-type structure, a=8.5761(14), b=8.607(3), c=12.896(2) Å, α=95.64(1), β=102.45(1), γ=108.42(1)° and Z=1. The Cd₃V₂O₈ structure is made up of Cd1O₄ infinite chains of edge-sharing Cd1O₆ octahedra which are parallel to the b direction. The Cd1O₄ chains are linked together by VO₄ tetrahedra and strongly distorted Cd2O₄ tetrahedra. The structure of Cd₁₈V₈O₃₈ is based on an ordered three-dimensional framework of cadmium and vanadium polyhedra that share corners. The distorted CdO₆ octahedra, CdO₅ trigonal bipyramids and CdO₅ square pyramids share corners, edges or faces.

Mots clés: Vanadate; Na₂CrO₄-type; Maricite; CdO–V₂O₅ system; Oxide materials; Crystal structure

Domaines: Matériaux

Hamdi Ben Yahia, Etienne Gaudin, Cédric Féral-Martin, Jacques Darriet. Structural study of the NaCdVO₄–Cd₃V₂O₈ and CdO–V₂O₅ sections of the ternary system Na₂O–CdO–V₂O₅. Journal of Solid State Chemistry, 2010, 183 (4), pp.776-783. ⟨10.1016/j.jssc.2010.01.018⟩. ⟨hal-00468603⟩