Engelhardt-Michel 1987 NMR Q-species classification: Q4 (4-bridging O fully-polymerized), Q3 (3-bridging + 1-non), Q2-Q0; non-bridging-oxygen NBO/Si ratio drives glass property changes; modifiers (Na+, Ca2+) increase NBO.
Engelhardt-Michel 1987 NMR Q-species classification: Q4 (4-bridging O fully-polymerized), Q3 (3-bridging + 1-non), Q2-Q0; non-bridging-oxygen NBO/Si ratio drives glass property changes; modifiers (Na+, Ca2+) increase NBO.