Activities of alkali metal oxides and silica are calculated for regions of the Li 2 O‐SiO 2 , Na 2 O‐SiO 2 , and K 2 O‐SiO 2 phase diagrams where volatility, cell potential, and thermodynamic data are available. For the high‐silica composition regions, activities are calculated from the stable phase diagrams and assumptions based on sub‐regular solution behavior. These data permit estimates of the phase boundaries for the metastable two‐liquid regions in the Li 2 O and Na 2 O systems which may be compared with experiment. An estimate is also made of the critical point for K 2 O‐SiO 2 to determine whether metastable phase separation in this system will be experimentally obtainable.
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R. J. Charles (1967) studied this question.
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