Disordering and the progress of hydration at the surface of diopside: A cross-polarisation MAS-NMR study

Details Disordering and the progress of hydration at the surface of diopside: A cross-polarisation MAS-NMR study Disordering and the progress of hydration at the surface of diopside: A cross-polarisation MAS-NMR study

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.3017p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 12, pp.3017-3021

Physics

1

Scientific paper

Samples of synthetic crystalline diopside were prepared with different volumes of surface phase by varying the time of grinding of each sample, and then investigated using 29 Si MAS-NMR. Hydration of the surface, which begins during grinding in laboratory air, allows the surface phase to be detected using 1 H- 29 Si CP MAS-NMR. The surface phase appears to be structurally similar to diopside glass. Several hours of reaction with aqueous solution promotes the formation of Q 2 -(OH) 2 , which is indicated by the appearance of a peak in the CP-MAS spectrum at -93 ppm. The progress of hydration appears to be relatively independent of the pH of the aqueous solution.

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