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Abstract
Tin phosphate glasses, of general formula xSnO · (1 − x)P2 O5 (0.3 < x < 0.8),have been prepared by conventional melt-quench techniques and their structuresstudied using 31P and 119Sn nuclear magnetic resonance. The distribution of [PO4]Qnspecies changes with composition in accordance with the simple binary model,and the changes in chemical shift can be explained by the redistribution ofelectron charge from the P = O double bond. Sn(II) is found to occupy a highlyasymmetric site, typical of a sterically active lone pair of electrons. The119Sn parameters of the chemical shift tensor change systematically withx, reflecting thechange in local environment from one where the next nearest neighbours are predominantlyQ2phosphorus to one where they are predominantlyQ0phosphorus.
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