An analysis is made of the information provided by the method of isotopic substitution in neutron diffraction on the metal atom coordination environment in M-A-X glasses, where M denotes Ag or Cu, A a Group IVB or VB element, and X a chalcogen. It is found that the M-X coordination number is low (∼ 3-4) but there is no clear correlation between its precise value and whether the material is a semiconductor or fast-ion conductor. When the concentration of M is high it is possible to measure the M-M partial pair distribution function gM-M(r). In those systems for which results are available it is found that, irrespective of the electrical conductivity mechanism, short M-M nearest-neighbour distances are present. However, the first peak in gM-M(r) is more clearly defined in the case of semiconducting glasses.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry