The partial ¹H NMR spectra of AlOH and molecular H₂O in hydrous aluminosilicate glasses: Component-Resolved analysis of ²⁷Al¹H cross polarization and ¹H spin-echo MAS NMR spectra

The Component-Resolved methodology was applied to ¹H spin-echoand ²⁷Al-¹H cross polarization(CP) MAS NMR data of aluminosilicate glasses. The method was able to resolve two components with different T2 relaxation rates, hydroxyl groups(OH)and molecular water(H ₂O_mol), from the spin-echo data and to determine partial spectra and the relative abundances of OH and H₂O_mol. The algorithm resolved two to three components with different ²⁷Al- ¹H CP dynamics from the ²⁷Al-¹H cross polarization data; the obtained partial NMR spectra for Al-OH are in excellent agreement with those obtained previously from the difference spectra between spectra with various contact times and confirm previous quantitative results and models for the Al-OH,Si-OH and H₂O_mol speciation(Malfait and Xue, 2010).