以甲醇锂和金属醇盐为原料, 利用溶胶凝胶法制备了L2O-B2O3-Al2O3三元复合干凝胶. 采用FTIR以及XRD对干凝胶结构随Al2O3含量和温度的变化进行了表征. 结果表明：在干凝胶中随着Al2O3含量的增加, 四配位态B原子的相对含量在降低, 处于非对称态的三配位B原子的相对含量在增加, 处于对称态的三配位B原子相对含量在降低, 三配位态B原子总的相对含量在增加. 含10mol%Al2O3的干凝胶经过550℃热处理1h, 其结构由非晶态转变为晶态, 主晶相是Li2AlB5O10.
Li2O-B2O3-Al2O3 composite xerogels were successfully prepared from lithium methoxide, tri-nbutylborate and aluminum trisecbutoxide dissolved in methanol and tetrahydrofuran by SolGel method. The structure changes of xerogels upon increasing the Al
2O3 content and thermal treatment temperatures from 150℃ to 550℃ were characterized by FTIR and XRD. The results indicate that the relative content of BO4 units shows a continuous decrease with increasing Al2O3 contents. Consequently, the concentration of asymmetric BO3 units increase. The relative content of symmetric BO3 units decrease. Total relative content of BO3 units increase with the Al2O3 content increasing. The structure of the xerogel containing 10 mol%Al2O3 after heattreatment at 550℃ for 1h transforms from glassy to crystalline. The main crystalline is Li2AlB5O10.
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