"The vapour pressure of germanium monosulfide (liquid) was determined by a boiling point method. An expression for the vapour pressure as a function of temperature was obtained and the heat of vapourization calculated. Using the heat of sublimation data obtained by other investigators, the heat of fusion was calculated.
The thermodynamic properties, change of standard free energy (Δ F°) heat content (Δ H°) and entropy (Δ S°); of germanium disulfide were determined by using an indirect method. The equilibrium H2S/H2O ratios are determined for the reaction:
GeS2 (s) + 2H2O(g) = GeO2 (s) + 2H2S(g),
in the temperature range of 410-560°C by using a flow method and extrapolating the values of H2/H2O ratios to zero flow rate. An expression for the standard free energy of the reaction as a function of temperature was obtained. Using the known values of standard free energy of formation of GeO2(s), H2S(g) and H2O(g) an expression for the dissociation of germanium disulfide was calculated.
A detailed description is given for the methods and the apparatus used for both the vapour pressure and equilibrium studies.
The methods used for the preparation of the compounds GeS2 and GeS and their properties are described. X-ray diffraction patterns are given for GeS2, GeS and GeO2 phases"--Abstract, pages i-ii.
Larson, Andrew H.
Schlechten, A. W.
James, William Joseph
Lorey, G. Edwin
Materials Science and Engineering
M.S. in Metallurgical Engineering
Missouri School of Mines and Metallurgy
ix, 115 pages
© 1960 Sham Lal Malhotra, All rights reserved.
Thesis - Open Access
Germanium compounds -- Analysis
Germanium compounds -- Heat treatment
Vapor pressure -- Measurement
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Link to Catalog Record
Malhotra, Sham Lal, "A thermodynamic study of germanium sulfides" (1960). Masters Theses. 2798.