"Knudsen effusion experiments were carried out on CdO in fused silica crucibles at temperatures of 918°K, 1008°K with orifice areas from 2.742x10-3 cm2 to 30.52x10-2 cm2. The experiments were made in a molybdenum-wire, resistance-heated vacuum furnace. Several orifice areas were used at each temperature and reciprocal pressure versus orifice area plots were made. These plots yielded an upper limit to the evaporation coefficient of. 4.15x10-2. An equilibrium constant for the vaporization reaction
CdO(s) = Cd(g) + 1/202 (g)
log Keq = 11.12 - 1.952x104/T.
was obtained. Second and third law values of ΔH°298 were 91.1±1.1 kcal/mole and 88.7±0.9 kcal/mole respectively. A ΔS°298 of 54.1±3.8 was determined by the second law method. The vapor pressure of silver was measured at 1210°K to check experimental techniques. Agreement with an accepted value was within 6.5 per cent"--Abstract, page ii.
James, William Joseph
O'Keefe, T. J. (Thomas J.)
Moore, Robert E., 1930-2003
Materials Science and Engineering
M.S. in Ceramic Engineering
University of Missouri. Space Sciences Research Center
University of Missouri at Rolla
vii, 65 pages
© 1967 R. Tom Coyle, Jr., All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Cadmium compounds -- Effect of high temperatures on
Vapor pressure -- Mathematics
Thermodynamics -- Measurement
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Coyle, R. Tom Jr., "Vapor pressure and evaporation coefficient of cadmium oxide" (1967). Masters Theses. 2936.