Structural studies of zinc polyphosphate glasses by nuclear magnetic resonance

Wiench, J. W.; Pruski, M.; Tischendorf, B.; Otaigbe, J. U.; Sales, B. C.

Ames Laboratory

Iowa State University

Ames, IA USA

Abstract

NMR spectroscopy of solids and of liqs. was used to study the structure of xZnO-(1 - x)P2O5 glasses prepd. from a glass melt in the compn. range 0.35 £ x £ 0.70. Relative concns. of Qn units in the solid glasses have been compared with the liq. NMR spectra and with the predictions based on the reorganization theory. Disproportionation reactions in glass liqs. of meta- and pyrophosphates are evident. Anisotropies of chem. shift tensor for all phosphorus units are given. Structural changes assocd. with CSA parameters, including the presence of rings and chains are discussed. Both solid and liq. state NMR spectra show that ultraphosphate glasses consist mainly of ring structures, while only chains are present in metaphosphates.