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The activity of alkali metal oxides can be controlled in one-atmosphere wire-loop experiments at high temperature by suspending a crucible containing alkali silicate melt beneath the samples. The method has been applied to measuring the activity coefficient of NaO 0.5  in a series of CMAS-NaO 0.5  melts relative to that in the anorthite-diopside eutectic composition at 1400 °C, using a reservoir of NaO 0.5 -SiO 2  melt. The results show that this relative activity coeficient decreases strongly with SiO 2 , increases with CaO and MgO, but is insensitive to AlO 0.5  This latter behavior is inconsistent with “quasi-crystalline” models of melt thermodynamics that hypothesize Na-Al species.

american mineralogist

Letter: A method for controlling alkali-metal oxide activities in one-atmosphere experiments and its application to measuring the relative activity coeficients of NaO 0.5  in silicate melts