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通过研究提拉法生长的掺杂Ti浓度为0.2at%的LiAlO2晶体吸收光谱,荧光光谱和红外光谱,来分析此新型晶体的结构.分析发现光谱中仅出现了四价Ti离子的196nm的特征吸收峰,用235nm光激发得到384nm的特征发射峰;针对吸收光谱中660—820nm出现的四个弱小吸收峰提出了一个色心模型,从而解释了空气和富Li气氛处理后吸收峰消失的现象;对比纯LiAlO2晶体的红外光谱发现,Ti的掺入仅影响了[AlO4]键强,而[LiO4]及相关键强几乎不变;结合ICP测试估算出直径50mm,厚1mm的TiLiAlO2的Li空位为5.5×1020个.
The structure of this novel crystal was analyzed by studying the absorption, fluorescence and infrared spectra of the LiAlO2 crystal grown by the Czochralski method with a Ti concentration of 0.2 at% .It was found that only 196 nm of tetravalent Ti ions appeared in the spectra Absorption peak at 235 nm, a 384 nm emission peak was obtained. A color center model was proposed for the four weak absorption peaks at 660-820 nm in the absorption spectrum, thus explaining the disappearance of the absorption peak after air and Li-rich atmosphere treatment Compared with the pure LiAlO2 crystal, the infrared spectrum of TiLiAlO2 crystals shows that the incorporation of Ti only affects the [AlO4] bond strength, but the [LiO4] and its related bonds are almost invariable. The Li vacancy of TiLiAlO2 with a diameter of 50mm and a thickness of 1mm Is 5.5 × 1020.