Structural study of xNa2S + (1 - x)B2S3 glasses and polycrystals by multiple-quantum MAS NMR of 11B and 23Na

Experiments were performed to characterize the structural evolution of the glassy and polycrystalline alkali binary thioborate system xNa2S + (1-x)B2S3 using magic angle spinning nuclear magnetic resonance (MAS NMR) and by two-dimensional multiple-quantum analysis. The results described the short range order of the fundamental network structures in glass compositions. Moreover, the dominant 11B resonances in glassy samples exhibited similarities with the structural units found in the the polycrystalline compounds.