Abstract
Water solubility and speciation have been studied in melts from the system albite-nepheline. Water solubility was determined at PH2O = 200 MPa and T = 1200oC using Karl Fischer titration (KFT) and weight loss methods. It increases from 5.8 ± 0.1 wt. % in the albite melt to 7.25 ± 0.25 % in the nepheline melt. The solubility dependence has a sigmoidal shape with a steep increase in the Ab40–Ab60 compositional range. The densities of the hydrous glasses have been measured using the thermal-gradient method. Infrared (IR) combination bands of molecular H2O and hydroxyl groups in these glasses demonstrate a systematic shift to lower frequencies with increasing alkalinity. The data are consistent with the appearance of aluminate species (Al-O-Al fragments) appearing at 40–60 wt.% nepheline (Ab60–Ab40).
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