Fig. 5
IR and 1H MAS NMR spectroscopy performed on the altered glass. a, b IR spectra of the 3.5–5.5-μm-altered glass powder before and after heat treatment. All spectra are normalized to the same maximum height. c 1H MAS NMR spectra of the 3.5–5.5-μm-altered glass powder before and after heat treatments at different temperatures. Spectra are normalized to the sample mass. d 1H MAS NMR signal obtained by DA and using an HE pulse sequence with varying echo delays on the altered sample at ambient temperature (see Supplementary Material Fig. S6a for results from heated samples)
