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_xS_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.