Chem. Mater., ASAP Article 10.1021/cm070496k S0897-4756(07)00496-6 Web Release Date: October 18, 2007 Copyright © 2007 American Chemical Society
NMR Structural Study on the As-P-S Glassy System
S. H. Santagneli, I. Skripatchev, S. J. L. Ribeiro, and Y. Messaddeq,J. Schneider
Glasses having the composition As2S3(1-x)-P2S5(x) with x ranging from 0 to 0.7 have been investigated to determine the compositional effect on properties and local structure. Glass transition temperature (Tg) decreases and molar volume (Vm) increases with an increase in P content. Using 31P NMR, we measured the strength of the 31P-31P magnetic dipolar interaction in the glass samples and the AsPS4 crystallized phase. Based on these data, we observed the formation of the As2P2S8 network, which reflects an increase in the average coordination number and a decrease in the degree of rigidity.