Characterization of Point Defects in Lithium Aluminate (LiAlO2) Single Crystals
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
Pagination or Media Count:
Lithium aluminate LiAlO2 is an insulating wide-band gap material currently under development for tritium breeding and radiation detection and dosimetry applications. Point defects are imperfections in a crystal lattice localized over a few atomic lengths that can alter the electrical, mechanical, or optical properties of materials. An understanding of point defect behavior is a necessary precursor for optimizing lithium aluminate for nuclear applications. This dissertation has identified and characterized the major point defects created and induced through x-ray and neutron radiation using electron paramagnetic resonance and fluorescence spectroscopy, thermoluminescence, and optical absorption. This dissertation explains for the first time the mechanism responsible for OSL in copper-diffused LiAlO2 and characterizes for the first time the hole Li vacancies and electron-trapping F and F centers and transition-metal ions defects. These results should prove useful to any researcher that utilizes LiAlO2 in applications involving radiation.
- Inorganic Chemistry