Vapor Pressure of Gallium, Stability of Gallium Suboxide Vapor, and Equilibria of Some Reactions Producing Gallium Suboxide Vapor

Vapor pressures of gallium in the literature are too high because formed in the reaction of gallium with the quartz effusion cells used for the measurements. Gallium was found to be less reactive with alumina than with quartz. Measurements in an alumina effusion cell gave vapor pressures for gallium that obey the expression Values for were found for the reaction of gallium with quartz and magnesium oxide, respectively. The latter value was employed to calculate the equilibria in forming from the following pairs of reactants: gallium‐gallia, graphite‐gallia, tin‐gallia, gallium‐alumina, and gallium‐water vapor. The vapor pressures of silver and tin were determined and compared with literature values to check the constants of the system.