Figure 6
Nuclear Magnetic Resonance spectroscopy probing sodium and aluminum environments between 1.0 to 1.5 nm in alumino-silicate glasses with Al/Si = 0.72 and different X K . Experimental results are shown with black squares and predictions from MD simulations (Supplementary Information) for glasses with Al/Si = 0.66 are shown with open circles for comparison. (A) Second moments M 2 determined using 23Na-23Na Spin Echo NMR spectroscopy, reflecting Na-Na distributions. (B) Second moments M 2 determined with using 27Al-27Al Spin Echo NMR spectroscopy, reflecting Al-Al distributions. In (C) and (D), the initial slopes of the ΔS/S o = f (dipolar evolution time) relationships observed in {23Na}27Al REDOR MAS 20 kHz and {27Al}23Na REDOR MAS 10 kHz spectra are shown. They reflect, respectively, Na distributions around Al and Al distributions around Na. See Supplementary Information for further details. Errors are given at the 1σ confidence interval; if not visible, they are smaller than symbols.
