Fig. 6

a 11B MQMAS NMR spectra of as-received and annealed ISG fibers (upper panels, BO3 region; lower panels, BO4 region) (*: spinning sidebands). b Projections onto the isotropic NMR shift axis of the spectra shown in part a

a 11B MQMAS NMR spectra of as-received and annealed ISG fibers (upper panels, BO3 region; lower panels, BO4 region) (*: spinning sidebands). b Projections onto the isotropic NMR shift axis of the spectra shown in part a