Date of Award


Document Type

Dissertation - Restricted

Degree Name

Doctor of Philosophy (PhD)



First Advisor

Robert N. Blumenthal

Second Advisor

I. Bransky

Third Advisor

N. M. Tallan

Fourth Advisor

W. M. Hirthe

Fifth Advisor

M. A. Seitz


In this study, the compositional changes which take place during equilibration were monitored either by continuously weighing the specimen with a sensitive microbalance or by measuring its electrical conductivity. The monoxides of manganese, cobalt and iron were chosen for study since these oxides depart from stoichiometry to an extent that is easily measured by thermogravimetric techniques at high temperature. In addition, the availability of other diffusion and point defect data on these oxides offered the possibility of a meaningful comparison with other diffusion experiments and a means of determining the validity of the equilibration kinetics technique. Since the thermogravimetric technique measures the change in oxygen content of the oxide directly, the validity of the electrical conductivity technique, which involves several assumptions, could also be determined on the same specimens.



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