Masters Theses

Abstract

"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.

Advisor(s)

Larson, Andrew H.

Committee Member(s)

Schlechten, A. W.
James, William Joseph
Lorey, G. Edwin

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Metallurgical Engineering

Publisher

Missouri School of Mines and Metallurgy

Publication Date

1960

Pagination

viii, 84 pages

Note about bibliography

Includes bibliographical references (pages 79-80).

Rights

© 1960 Satya Prakash Jain, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Germanium compounds -- AnalysisGermanium compounds -- Heat treatmentThermodynamic equilibrium

Thesis Number

T 1293

Print OCLC #

5932428

Electronic OCLC #

956989755

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