Date of Award
Spring 1979
Document Type
Thesis - Restricted
Degree Name
Master of Science (MS)
Department
Mechanical Engineering
First Advisor
Blumenthal, Robert N.
Second Advisor
Seitz, Martin A.
Third Advisor
Hirthe, Walter M.
Abstract
A nonequilibrium dynamic technique was used to measure the electrical conductivity of .1 and .5 mole % Ta205 doped Ceria (Ce1-yTay02-x with y = .002 and .010 respectively) as a function of temperature between 1000 and 700°C near stoichiometry (in oxygen) and at several nonstoichiometric compositions between x = . 001 and .1. The conductivity at each composition was characterized in the form "formula" Although the results were reasonably consistant [sic] with equilibrium conductivity data previously obtained at 1000 and 800°c2, the activation energy (Q) exhibited a nonlinear dependence on x which was in contrast with previous representations of the conductivity of nonstoichiometric Tantalum doped Ceria. The results appear to discount an interpretation of the conductivity in terms of a simple defect structure and indicate a complex roll of the dopant defects !n the conduction mechanism. Similar measurements were also carried out on pure nonstoichiometric Ceria over an equilvalent [sic] temperature and compositional range. The activation energy in this case was consistent with a linear dependence on x.
Recommended Citation
Mason, Marco J., "Constant Composition Temperature Dependence of the Electrical Conductivity of Nonstoichiometric Tantalum Doped Ceria" (1979). Master's Theses (1922-2009) Access restricted to Marquette Campus. 4736.
https://epublications.marquette.edu/theses/4736