| Original Articles |
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Spectra Analysis of a Novel Ti-Doped LiAlO2 Single Crystal |
| ZOU Jun;ZHOU Sheng-Ming;LI Yang;WANG Jun;ZHANG Lian-Han;XU Jun |
| 1Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
2Graduate School of Chinese Academy of Sciences, Beijing 100049 |
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| Cite this article: |
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ZOU Jun, ZHOU Sheng-Ming, LI Yang et al 2005 Chin. Phys. Lett. 22 2622-2625 |
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Abstract LiAlO2 single crystals doped with Ti at concentration 0.2 at.% are grown by the Czochralskl technique with dimensions Ф42×55mm. 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 VLi and V0 absorptions, respectively. The peaks at 716nm and 798nm may stem from the VLi+ 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.
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| Keywords:
61.72.-y
81.40.-z
32.50.+d
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Published: 01 October 2005
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| PACS: |
61.72.-y
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(Defects and impurities in crystals; microstructure)
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81.40.-z
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(Treatment of materials and its effects on microstructure, nanostructure, And properties)
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32.50.+d
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(Fluorescence, phosphorescence (including quenching))
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