"The experimental determination of some of the thermodynamic properties of germanium sulphide phases was conducted by a hydrogen reduction technique. The equilibrium H2S/H2 ratios were determined as a function of temperature for the two phase equilibria GeS2-GeS and GeS-Ge. A Tutwiler analysis technique was used to analyze the equilibrated gas mixture for hydrogen sulphide content.
A detailed description is given for the process and the apparatus used in performing the experiments for equilibration of H2S/H2 gas mixture. The methods used for the preparation of germanium sulphide phases are also discussed.
The investigation was performed in the temperature range of 400° - 470°C. The Stoichiometric nature of the germanium sulphide phases could not be studied due to experimental difficulties.
For the determination of the standard free energies, heat contents and entropies for the reactions:
(1) GeS2 + H2 ⇌ GeS + HaS and (2) GeS + H2 ⇌ Ge + H2S, it was assumed that the activities of the compounds do not change within the given temperature interval.
The equations expressing the standard free energy change for the reactions: 1) GeS2 + H2 ⇌ GeS + H2S 2) 2GeS2 ⇌ 2GeS + S2 3) GeS + H2 ⇌ Ge + H2S and 4) 2GeS ⇌ 2Ge + S2 were derived as a function of temperature and the graphical representations of the total free energy of formation of these phases versus temperature have been shown.
The thermodynamic data obtained in this investigation have been compared and discussed with the work of other investigator"--Abstract, pages ii-iii.
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
viii, 84 pages
© 1960 Satya Prakash Jain, All rights reserved.
Thesis - Open Access
Germanium compounds -- Analysis
Germanium compounds -- Heat treatment
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Jain, Satya Prakash, "A thermodynamic study of the germanium sulphides" (1960). Masters Theses. 2796.