Abstract
Thermochemical calculations have been performed to evaluate the mechanisms responsible for the sodium loss caused by formation of sodium β‐alumina and sodium aluminate. Also evaluated are the sodium loss reactions with the emission mix and seal glass and the mechanisms by which oxygen can migrate from one region of the arc tube to another. These considerations show that two predominant mechanisms are: (i) a direct reaction of sodium gas with the alumina arc tube yielding aluminum gas and (ii) the reaction of sodium gas and oxygen with the arc tube; the predominant oxygen sources are chemically bound oxygen released from the emission mix and impurities, such as water vapor and carbon dioxide.
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