State of nondissociated molecules of water inclusions in aluminosilicate glasses (H-1 NMR and electron microscopy study)

Four species of nondissociated water inclusions observed in H2O bearing qua rtz and aluminosilicate glasses were experimentally studied by temperature solid state H-1 NMR These inclusions are as follows: (1) Bubble water has t he H-1 NMR spectrum as a singlet with a full width at half maximum (FWHM) s imilar to 250 Hz. (2) Water macroclusters containing similar to 10(3) H2O m olecules form the H-1 NMR singlet with a FWHM similar to 500 Hz. The macroc luster water is the supercooled state down to similar to 240 K and shows sh arp hysteresis in the aggregate state (3) Strongly H-bonded (SHB) water clu sters are inclusions consisting of several (similar to 10) H2O molecules li nked by strong hydrogen bonds These inclusions generate, in H-1 NMR spectru m, a wide line with a FWHM similar to 10 kHz which narrows sharply with 300 K and higher. (4) Single isolated H2O molecules ave the smallest water inc lusions. They are only observed in the multicomponent aluminosilicate glass es and are practically absent in pure quartz glasses A phase stare differs in the inclusions under study-the water in the bubbles and macroclusters is liquid but the water of structure clusters is quasi-solid. isolated H2O mo lecules are a physical solution of water in glass.