Masters Theses
Date of Award
8-2010
Degree Type
Thesis
Degree Name
Master of Science
Major
Materials Science and Engineering
Major Professor
Dr. Charles Melcher
Committee Members
Dr. Claudia Rawn, Dr. Thomas Meek
Abstract
Single crystals with composition Lu3Al5O12 were synthesized using Czochralski and micro-pulling-down melt growth techniques. Polycrystalline ceramics of the same composition were synthesized by vacuum annealing of powders prereacted using a citrate-nitrate combustion technique and by spark-plasma-sintering of powders prereacted using a flame-spray-pyrolysis technique. Single crystals and polycrystalline ceramics are activated with Ce3+ or Pr3+ or doubly activated with Ce3+ and Tb3+ ions. Cerium-doped Czochralski-grown single crystals were compared to cerium-terbium codoped Czochralski-grown and micro-pulling down single crystals. Cerium-terbium codoped single crystals are also compared to similarly-activated polycrystalline ceramics sintered under vacuum using combustion-synthesized prereacted powders. X-ray diffraction analysis and fluorescence characterization were used to determine successful formation of single-phase LuAG and successful incorporation of doping species. Absorbance, fluorescence, radioluminescence, and scintillation decay analyses were used to compare synthesis processes and activator selection.
Recommended Citation
Cutler, Paul A, "Synthesis and Scintillation of Single Crystal and Polycrystalline Rare-Earth-Activated Lutetium Aluminum Garnet. " Master's Thesis, University of Tennessee, 2010.
https://trace.tennessee.edu/utk_gradthes/695