1. Spectra Analysis of a Novel Ti-Doped LiAlO 2 Single Crystal
- Author
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Zou Jun, Li Yang, Zhou Sheng-ming, Xu Jun, Zhang Lian-Han, and Wang Jun
- Subjects
Crystal ,Materials science ,Annealing (metallurgy) ,Doping ,Analytical chemistry ,General Physics and Astronomy ,Thermal stability ,Single crystal ,Fluorescence spectra ,Spectral line ,Ion - Abstract
LiAlO2 single crystals doped with Ti at concentration 0.2 at.% are grown by the Czochralskl technique with dimensions Phi 42 x 55 mm. Ti ions in the crystal are quadrivalence proven by comparing the absorption and fluorescence spectra of pure LiAlO2 and Ti: LiAlO2. After air and Li-rich atmosphere annealing, the absorption peaks in the range of 600-800nm disappear. We conclude that 682 and 756nm absorption peaks are attributed to the V-Li and V-O absorptions, respectively. The peaks at 716nm and 798nm may stem from the V-Li(+) and F+ absorptions. The colour-centre model can be applied to explain the experimental phenomena. Ti4+-doping produces more lithium vacancies in the LiAlO2 crystal. The intensities of [LiO4] and the associated bonds remain unchanged, which improves the anti-hydrolyzation and thermal stability of LiAlO2 crystals.
- Published
- 2005