Thesis (PhD.)--University of Technology, Sydney, 2000. / "A thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy, University of Technology Sydney, November 2000" Includes bibliographic references.

Thesis (Ph. D.)--Columbia University, 1935. / Vita. Bibliography: p. 47-49.

Thesis (Ph.D.)--Virginia Commonwealth University, 2008. / Prepared for: Dept. of Electrical Engineering. Title from thesis description page. Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 2004. / Includes bibliographical references.

Thesis (Ph. D.)--Lehigh University, 2003. / Includes vita. Includes bibliographical references (leaves 165-174).

published_or_final_version / Dental Materials Science / Master / Master of Science in Dental Materials Science

Thesis (M.S.)--University of Michigan, 2002.

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2009. / Title from title screen (site viewed February 25, 2010). PDF text: 164 p. : ill. (some col.) ; 4 Mb. UMI publication number: AAT 3386603. Includes bibliographical references. Also available in microfilm and microfiche formats.

published_or_final_version / abstract / Chemistry / Doctoral / Doctor of Philosophy

In order to understand better the defect structure and dynamics associated with lower valent dopants complexed with native defects in group IV oxides, In/Cd perturbed angular correlation spectroscopy was performed in ceria and zirconia. Examining the orientation symmetry axis of defects in ceria single crystals at low temperature has allowed the identification of a cadmium with a bound near-neighbor oxygen-vacancy complex as well as a complex involving a cadmium with two opposing, near-neighbor oxygen vacancies. The orientation of the symmetry axis of a third complex is reported; however, this information is not sufficient to identify it. Complementing these low temperature studies, the dynamics of the cadmium/oxygen-vacancy interaction in zirconia at high temperatures was studied. The motion of the oxygen vacancy at high temperatures results in a damping of the PAC signal. This damping is not well characterized by the heuristic Marshall-Meares PAC fitting function, and a model is proposed to fit the data in terms of three physical parameters associated with the vacancy's motion. These parameters are the rate at which a bound oxygen vacancy hops among equivalent sites about the probe, the rate at which a bound vacancy detraps, and the rate at which a vacancy is trapped by cadmium. Fits of individual spectra using this model give respective activation energies of 0.3-0.6 eV, 0.9-1.6 eV, and 0.4-0.6 eV. The uncertainty in these energies can most likely be reduced by fitting spectra from multiple temperatures simultaneously. Despite the large uncertainty in the fitted energies, the values are physically reasonable and indicate that the model adequately describes the motion of the oxygen vacancy about cadmium. / Graduation date: 1997