Date of Award


Document Type

Dissertation - Restricted

Degree Name

Doctor of Philosophy (PhD)


Mechanical Engineering

First Advisor

Robert N. Blumenthal

Second Advisor

Martin A. Seitz

Third Advisor

R.A. Gaggioli

Fourth Advisor

R.F. Brebrick

Fifth Advisor

Walter Hirthe


Doped cerium oxide has shown great promise as an electrolyte in high temperature fuel cells. However before its application is justified, a better understanding of the defect structure in doped cerium oxide is required. Cerium oxide has extensive solubility for aliovalent cations and exhibits a large non-stoichiometric region at elevated temperatures. Although there have been several defect structure analysis of both "pure" and doped cerium oxide, a combined analysis of electrical conductivity. ionic transference number and non-stoichiometry is not available.

In this investigation~ electrical conductivity of CaO and Y2O3 doped CeO2 is measured as a function of temperature and oxygen pressure. The ionic transference numbers of CaO doped CeO2 are measured using galvanic cells as a function of temperature and oxygen pressure. The results are analyzed in combination with non-stoichiometric data available, and the partial ionic and electronic conductivities are obtained as a function of temperature and non-stoichiometry.



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