O-17 3Q-MAS NMR characterization of a sodium aluminoborosilicate glass andits alteration gel

A quantitative approach was applied to the 3Q-MAS spectra of O-17 to charac terize a four-oxide glass composition and the alteration film that formed o n its surface during aqueous alteration. The intensity of the oxide sites w as corrected according to the quadrupolar interaction based on the efficien cy of the coherence transfers induced by a 3Q-MAS sequence The restructurin g of a boron-depleted aluminosilicate gel was clearly visible during altera tion by (H2O)-O-17 (C) 2001 Elsevier Science B.V. All rights reserved.