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
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
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.
ZOU Jun;ZHOU Sheng-Ming;LI Yang;WANG Jun;ZHANG Lian-Han;XU Jun. Spectra Analysis of a Novel Ti-Doped LiAlO2 Single Crystal[J]. 中国物理快报, 2005, 22(10): 2622-2625.
ZOU Jun, ZHOU Sheng-Ming, LI Yang, WANG Jun, ZHANG Lian-Han, XU Jun. Spectra Analysis of a Novel Ti-Doped LiAlO2 Single Crystal. Chin. Phys. Lett., 2005, 22(10): 2622-2625.