硒铟镓银晶体中二相沉淀物研究

Study on the Second-phase Precipitates in AgGa_(1-x)In_xSe_2 Single Crystal

应用金相显微镜、能量色散谱仪、X射线衍射仪等对AgGa0.8In0.2Se2晶体中的二相沉淀物进行了观察、测试和分析,发现呈梭状的二相沉淀物存在明显Ag含量缺失。根据EDS测试结果和差热实验数据研究了消除该二相沉淀物的热处理方案,即在含有Ag2Se组分的AgGa0.8In0.2Se2多晶混合粉末包埋下,对AgGa0.8In0.2Se2晶体进行淬火处理。结果表明:用含有1.26wt%Ag2Se的同成分多晶混合粉末包埋,在720℃下保温120 h后经淬火处理的晶片,梭状二相沉淀物得到很好的消除,红外透过率得到显著提高。

The second-phase precipitates in AgGa0.8In0.2Se2 crystal were investigated by metalloscope,energy dispersive spectrometer,X-ray diffractometer,etc.The results indicated that the content of Ag in the spindle-shaped precipitates wasn' t sufficient compared with normal substance of stoichiometric ratio.Based on the results of EDS and DSC,heat treatment was adopted to eliminate the second-phase precipitates.The samples were quenched in the cover-up of AgGa0.8In0.2Se2 polycrystalline powder mixed with a slight amount of Ag2Se.The results indicated that the second-phase precipitates were well eliminated after being quenched at 720 ℃ for 120 h in the atmosphere of the same composition of polycrystals containing 1.26wt% Ag2Se.Moreover,the IR transmittance was also remarkably enhanced.