The effect of fictive temperature on the structure of E-glass: A high resolution, multinuclear NMR study

The variation of the structure of E-glass with fictive temperature has been examined with high resolution, multinuclear (11B, 27Al, 29Si, 17O, and 19F) MAS NMR. The previously observed decrease in 4-coordinated boron with increasing fictive temperature is confirmed and, for the first time, is directly correlated with an increase in non-bridging oxygens. An increase in 5-coordinated Al is also observed, and is linked to an increase in association of F with Al at higher fictive temperature.