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The structure of glassy Ag 0.077 Ge 0.212 Se 0.711 , which lies at  y  = 0.077 on the Ag  y  (Ge 0.23 Se 0.77 ) 1− y   tie-line, was investigated by using the method of neutron diffraction with silver isotope substitution. Two glass transition temperatures were found from a characterisation of the material using modulated differential scanning calorimetry, which indicates a mixed phase material. The diffraction method provides site-specific information on the Ag coordination environment, and gives an average of 3.5(1) Ag–Se nearest-neighbours with a bond distance of 2.65(1) Å together with 0.9(1) Ag–Ag next nearest-neighbours at a distance of 2.9(2) Å. The incorporation of silver does not appear to have a marked effect on the coordination number of Se to other matrix (Ge or Se) atoms, which supports the notion that Ag forms dative bonds with Se lone-pair electrons. A model is given for predicting the change in the Se to matrix atom coordination number when a monovalent metal such as Ag is added to a Se rich Ge–Se base glass.

Structure of Glassy Ag–Ge–Se by Neutron Diffraction with Isotope Substitution