摘 要: 利用微波均相沉淀法成功制备了纳米级 Y₃Al₅O₁₂ 粉体。利用 XRD 技术分析了 Y₃Al₅O₁₂ 前驱体煅烧过程的物相变化, 利用 TEM 对 Y₃Al₅O₁₂ 前驱体形貌进行了表征。结果表明: 微波辐照能够在低尿素 含量( 25:1) 的条件下, 合成单相 Y₃Al₅O₁₂ 粉体, 大大降低了尿素的用 量; 纯 Y₃Al₅O₁₂ 相的形成温度有了很大程度的降低, 使得合成的前驱 体在 900 ℃下煅烧直接生成 Y₃Al₅O₁₂ 单相粉体; 同时发现在密闭条件 下的微波特殊效应与非密闭条件下相比具有更好的效果。 

关键词: Y₃Al₅O₁₂ 粉体; 微波辐照; 纳米粉体

Abstract: Y₃Al₅O₁₂ nanopowders was synthesized successfully by the mi crowave homogeneous precipitation in the presence of urea. The compo sition and transformations during calcination of Y₃Al₅O₁₂ precursor were analyzed by XRD, and the size and morphology of Y₃Al₅O₁₂ precursor were characterized by TEM. The results show that the amorphous precur sor synthesized under [urea] /[metal ions] molar ratio of 25 crystallizes di rectly to single-phase Y₃Al₅O₁₂ at 900 ℃. It was found that the special ef fect of microwave irradiation in the closed state was better than that in the open state. 

Keywords: Y₃Al₅O₁₂ powder; microwave irradiation; nano-powder