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A method for controlling alkali-metal oxide activities in one-atmosphere experiments and its application to measuring the relative activity coefficients of NaO_0.5 in silicate melts

Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia

Correspondence: ^* E-mail: hugh.oneill{at}anu.edu.au

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-SiO₂ melt. The results show that this relative activity coefficient decreases strongly with SiO₂, 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.

This article has been cited by other articles:

				A. Borisov, Y. Lahaye, and H. Palme The effect of sodium on the solubilities of metals in silicate melts American Mineralogist, May 1, 2006; 91(5-6): 762 - 771. [Abstract] [Full Text] [PDF]