The Knudsen effusion method was used to find the equilibrium reaction pressure of barium for the following reactions:
4BaO + 2Al - 3Ba + BaO·Al2O3 (l)
4BaO + Si - 2Ba + 2BaO·SiO2 (2).
The resulting barium pressure for reaction (l) ranged from 0.27 mm. Hg to 1.77 mm. Hg in a temperature range of 940°C to 1086°C. The barium pressures for reaction (2) varied from 0.38 mm. Hg to 1.94 mm. Hg in a temperature range of 1000°C to 1086°C. The free energies of formation of BaO·Al2O3 and 2BaO·SiO2 at 1087°C were calculated from the pressure data and found to be -360,800 calories and -376,900 calories, respectively.
Schlechten, A. W.
Larson, Andrew H.
Tappmeyer, Wilbur P.
Wolf, Robert V., 1929-1999
Materials Science and Engineering
M.S. in Metallurgical Engineering
Missouri School of Mines and Metallurgy
iv, 94 pages
© 1962 Thomas A. Theobald, All rights reserved.
Thesis - Open Access
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Theobald, Thomas A., "A determination of vapor pressure of barium in the thermal production of barium metal" (1962). Masters Theses. 4163.