High resolution magic angle spinning NMR studies of31P and11B in fast ion conducting AgI-Ag2O-P2O5 and AgI-Ag2O-B2O3 glasses

Silver iodide-based fast ion conducting glasses containing silver phosphate and silver borate have been studied. An attempt is made to identify the interaction between anions by studying the chemical shifts of³¹P and¹¹B atoms in high resolution (HR) magic angle spinning (MAS) NMR spectra. Variation in the chemical shifts of³¹P or¹¹B has been observed which is attributed to the change in the partial charge on the³¹P or¹¹B. This is indicative of the change in the electronegativity of the anion matrix as a whole. This in turn is interpreted as due to significant interaction among anions. The significance of such interaction to the concept of structural unpinning of silver ions in fast ion conducting glasses is discussed. Communication number 593 from Solid State and Structural Chemistry Unit