不同退火气氛下γ-LiAlO2形貌和结构研究

研究了温度梯度法生长的γ-LiAlO2晶体在1100℃下富Li气氛和空气中退火处理后的表面形貌、表面结构以及吸收光谱。发现γ-LiAlO2晶体的抛光面在1100℃空气中退火后变为粗糙面，X射线衍射(XRD)分析表明此粗糙面为单相的LiAl5O8。而γ-LiAlO2晶体的抛光面在1100℃富Li气氛中处理后几乎没有变化。同时对不同气氛下热处理的γ-LiAlO2晶体进行了光谱分析，确认了晶片中196nm的吸收峰是由Li空位引起的。

(001) γ-LiAlO2 plates grown by temperature gradient technique (TGT) have been annealed in Li-rich and O2 atmosphere at 1100 ℃/70 h. The surface structure, morphology and absorption spectra were investigated through scanning electron microscopy, X-ray diffraction, spectrophotometer at room temperature. Compared to the plate annealed in Li-rich atmosphere, the surface of the plate annealed in O2-atmosphere became coarse and grew Li-poor polycrystalline (LiAl5O8). With the all spectral analysis, it is confirmed that the 196 nm absorption peak is probably caused by Li vacancies in the plate.