MASS-NMR structural analysis of barium aluminofluorophosphate glasses with and without nitridation

The local structure of barium-aluminofluorophosphate (Ba–Al–P–O–F) glasses was investigated using high resolution magic-angle sample spinning nuclear magnetic resonance (MASS-NMR) spectroscopy. The ²⁷Al spectra show three different aluminum environments [Al(4), Al(5), and Al(6)] in these glasses. Changes were observed due to the addition of fluorine and nitrogen. ³¹P results indicate only one type of phosphorus environment which shifts with fluorine additions. The ¹⁹F spectra suggest that fluorine has both Ba and Al as nearest neighbors.