水热法合成不同形貌纳米氧化钇粉体
Synthesis of Nano-structure Yttria Powders with Different Morphology by Hydrothermal Method
颜虹云, 包 娜, 沈 林, 汪效祖
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作者单位：(南京工业大学 材料化学工程国家重点实验室, 江苏 南京 210009)
中文关键字：氧化钇； 纳米材料； 稀土； 水热
英文关键字：yttria; nano-material; rare earth; hydrothermal
中文摘要：以Y(NO)3为原料，在不同pH值条件下，采用水热法合成了氧化钇(Y2O3)前驱体，在不同温度下烧结得到了Y2O3纳米粉体。采用XRD、FT-IR分析前驱体的结构、成分，TG-DTG分析前驱体的热分解过程，FE-SEM分析前驱体及产物的形貌。结果表明：起始溶液pH值对前驱体的化学组成及Y2O3的形貌有显著的影响，随pH值的增大，前驱体及Y2O3的形貌由片状结构逐渐转变为棒状结构，煅烧温度对形貌影响不大。
英文摘要：Yttria precursors were synthesized by hydrothermal method under different pH value using yttrium nitrate as raw material. Nano-meter yttria powder with different morphologies was produced at different sintering temperature. The crystal structure and composition of the precursors were characterized by XRD and FT-IR. The decomposition process for precursors was analyzed by TG-DTG. The particle morphology of the precursors and the final products were characterized by FE-SEM. The results show that pH value of the starting solutions significantly impacts the chemical composition of precursors and the morphologies of yttria. The sheet-like precursors transform into rod-like structure as pH value increasing. The effect of sintering temperature on the morphology of yttria products is little.