Abstract
The local cation environments in single and mixed alkali silicate glasses are discussed on the basis of chemical shift trends observed in field-dependent multinuclear ( 29Si, 23Na, 6,7Li) magic angle spinning, as well as 29Si{ 23Na} and 29Si{ 7Li} rotational echo double resonance (REDOR) NMR results. Within the series (Li 2O) x (SiO 2) 1- x and (Na 2O) x (SiO 2) 1- x the alkali cation chemical shifts depend systematically on the network modifier concentration, reflecting changes in the alkali ion environments as the content of non-bridging oxygen species increases in the silicate network. Within the series [{Li 2O} 1- y {Na 2O} y ] 0.4{SiO 2} 0.6 systematic trends in the 7Li and 23Na chemical shifts indicate continuous changes in the cation environment as a function of Na/(Na + Li) ratio, consistent with intimate mixing of the cations. This interpretation is corroborated by results from 29Si{ 23Na} and 29Si{ 7Li} rotational echo double resonance (REDOR) NMR difference spectroscopy.
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