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Table 2 Water concentration of glasses

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

Glass nom. mol % H2O Conditions of synthesis FTIR values RAMAN
A4200 A5200 [OH] [H2Omol] [H2OTOT] [H2OTOT]
LS4 3.28 1650 °C 151 (12) 93 (9) 2.11 (35) 1.04 (22) 3.15 (41) 3.08 (60)
9.40 1.5 GPa 325 (18) 452 (21) 4.56 (70) 5.06 (42) 9.61 (81) 10.09 (60)
17.64 447 (21) 1109 (33) 6.26 (94) 12.42 (55) 18.68 (1.09) 18.74 (60)
NS4 3.28 1500 °C 155 (12) 3 (2) 3.85 (40) 0.07 (3) 3.92 (40) 3.44 (67)
9.40 1.5 GPa 301 (17) 86 (9) 7.35 (63) 1.89 (20) 9.24 (66) 9.46 (67)
17.64   403 (20) 440 (21) 9.52 (80) 9.35 (60) 18.87 (1.00) 17.54 (67)
KS4 3.28 1550 °C - - 3.98 (70)a 0.00 (0)a - 3.98 (74)
9.40 1.5 GPa - - 8.89 (70)a 0.73 (7)a - 9.62 (74)
17.64   - - 13.65 (70)a 2.30 (24)a - 15.95 (74)
  1. Nom. refers to the nominal water concentrations. [H2Omol], [OH], and [H2OTOT] concentrations are in mol %. A4500 and A5200 are the integrated intensities of the IR peaks at ~4500 and ~5200 cm−1 that have been used to quantify the content of [OH] and [H2Omol] for the LS4 and NS4 glasses. FTIR and Raman values are from Le Losq et al. (2015a). Errors are given at the 1σ confidence interval
  2. aCalculated with the calibration linking 1H MAS NMR sideband area to H2Omol content shown in Fig. 1; the concentration of OH is estimated by difference to [H2Omol] measured with using Raman spectroscopy