Abstract
The structure of glasses in the system (Li 2Se) x (SiSe 2) 1− x (0≤x≤0.70) has been characterized by combined Raman and 29Si magic-angle spinning (MAS) NMR measurements. In conjunction with parallel MAS NMR studies on crystallized specimens, the detailed silicon speciation has been derived as a function of composition. As in the compositionally analogous sulfide system, the spectra reveal the presence of both corner- and edge-sharing silicon tetrahedra, however, the overall fraction of edge-sharing species is lower in the selenide system. The electrical conductivity characteristics of both systems are in close analogy to each other.
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