title: Direct ¹⁷O NMR experimental evidence for Al-NBO bonds in Si-rich and highly polymerized aluminosilicate glasses.
abstract: By using solid-state (17)O NMR spectroscopy, we provide the first direct experimental evidence for bonds between Al and non-bridging oxygen (NBO) ions in aluminosilicate glasses based on rare-earth (RE) elements, where RE = {Lu, Sc, Y}. The presence of ∼10% Al-NBO moieties out of all NBO species holds regardless of the precise glass composition, at odds with the conventional structural view that Al-NBO bonds are absent in highly polymerized and Si-rich aluminosilicate glass networks.
authors.affiliation: Physical Chemistry Division, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden. mattias.eden@mmk.su.se.
authors.forename: Aleksander
authors.initials: A
authors.lastname: Jaworski
authors.forename: Baltzar
authors.initials: B
authors.lastname: Stevensson
authors.forename: Mattias
authors.initials: M
authors.lastname: Edén