title: Unraveling the atomic structure of Ge-rich sulfide glasses.
abstract: In contrast to the well-established structure of glassy GeS2, consisting of corner- and edge-sharing GeS(4/2) tetrahedra, the structural features of Ge-rich sulfide alloys remain essentially unknown. Two contrasting points of view: (1) a tetrahedral model, and (2) a distorted NaCl approach were neither confirmed nor excluded mostly because of missing advanced structural studies. Using high-energy X-ray scattering and neutron diffraction, we show the complexity of the short and intermediate range order in Ge(x)S(1-x) glasses, ⅓ ≤ x ≤ 0.47, formed by corner- and edge-sharing tetrahedra with two-fold coordinated sulfur species and a variable number of Ge-Ge bonds, and Ge-S units with three-fold coordinated sulfur at x ≥ 0.36.
authors.affiliation: Université du Littoral, F-59140, Dunkerque, France. bytchkov@ill.fr
authors.forename: Aleksei
authors.initials: A
authors.lastname: Bytchkov
authors.forename: Gabriel J
authors.initials: GJ
authors.lastname: Cuello
authors.forename: Shinji
authors.initials: S
authors.lastname: Kohara
authors.forename: Chris J
authors.initials: CJ
authors.lastname: Benmore
authors.forename: David L
authors.initials: DL
authors.lastname: Price
authors.forename: Eugene
authors.initials: E
authors.lastname: Bychkov
mesh_terms: D005857:Germanium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry; D015394:Molecular Structure; D033363:Neutron Diffraction; D013440:Sulfides / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D013440:Sulfides; D005857:Germanium