Abstract
The high-temperature chemistry of some mixed oxide thermionic emission materials has been studied by Knudsen cell mass spectrometry. It has been shown that these materials, such as Ba2CaWO6 and Ba3Y2WO9, vaporize by a dissociative process. The dominant volatile components over these materials are BaO(g), Ba(g), and Ca(g), with BaWO4(g) and BaWO3(g) being present in lower concentrations. The decomposition of these materials begins at approximately 1300°C.
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