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Progress in Earth and Planetary Science
Fig. 6 | Progress in Earth and Planetary Science

Fig. 6

From: Water and magmas: insights about the water solution mechanisms in alkali silicate melts from infrared, Raman, and 29Si solid-state NMR spectroscopies

Fig. 6

Variation of the polymerization of the glasses (ΔNBO/T) upon addition of 17.6 nom. mol % water represented as a function of the ionic radius of alkali. ΔNBO/T (= NBO/Tanhydrous − NBO/T17.6 mol% water) is calculated from the variations of the Q n species as observed in Raman spectra (plain symbols) or in 29Si NMR spectra (open symbols). Ionic radii of alkalis are from Whittaker and Muntus (1970), assuming sixfold oxygen-coordinated alkalis. The black dotted line is a linear fit of the ΔNBO/T vs ionic radius relationship for NMR data. For the Na-bearing silicate glass, Raman and 29Si NMR give the same value, so that symbols are difficult to distinguish. Error bars are given at the 1σ confidence interval

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