title: A mixed-valent niobium oxysulfide, La2Nb3S2O8.
abstract: Dilanthanum triniobium disulfide octaoxide, La(2)Nb(3)S(2)O(8), crystallizes in the orthorhombic space group Pnnm and is isostructural with the Ln(2)Ta(3)X(2)O(8) (Ln = La, Ce, Pr and Nd, and X = S and Se) family of tantalum compounds. Nb(4+) and Nb(5+) ions co-exist in the structure and occupy different crystallographic sites. While the Nb(4+) ions are found in mixed oxygen and sulfur octahedra, the Nb(5+) ions are found in oxygen-only octahedra.
authors.affiliation: Institut des Matériaux Jean Rouxel, 2 Rue de la Houssinière, 44322 Nantes, France. laurent.cario@cnrs-imn.fr
authors.forename: Laurent
authors.initials: L
authors.lastname: Cario
authors.forename: Houria
authors.initials: H
authors.lastname: Kabbour
authors.forename: Catherine
authors.initials: C
authors.lastname: Guillot-Deudon
authors.forename: Alain
authors.initials: A
authors.lastname: Meerschaut