The coordination environment of Ag in bulk-quenched Ag4As37.6Se58.3 and Ag2As3Se4 glasses is investigated by using the method of isotopic substitution in neutron diffraction. It is found that there is little change in the short-range order about Ag between the two compositions: Ag is covalently bonded to an average of ≈ 3 Se atoms at a distance of ≈ 2.68 A ̊ in both samples. The absence of a pronounced change in the structure about the metal atom in the AgAsSe system, between glass compositions where the electrical conductivity is electronic (4 at.% Ag)_and where it is predominantly ionic (22.2 at.% Ag), is by direct contrast with the case observed for glasses in the AgAsS system.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry