草酸铵沉淀法制备纳米氧化钇研究

以氧化钇、浓硝酸为原料，草酸铵为沉淀剂，十六烷基三甲基溴化铵为分散剂，采用草酸铵沉淀法制备纳米氧化钇前驱体，将前驱体在空气中焙烧制备纳米氧化钇粉体。用差热-热重分析确定了前驱体分解温度，用 X射线衍射和扫描电镜对样品进行表征，用激光粒度仪测量不同反应物物质的量比所得产品的粒度分布，得到制备纳米氧化钇最佳条件。实验表明，在最佳条件下可以制得平均粒径为40 nm的氧化钇粉体，其形貌为椭球形。

Preparation of nano-sized Y2O3 by ammonium oxalate precipitation method

The precursor of nano-sized Y₂O₃ was prepared by ammonium oxalate precipitation method，with Y₂O₃ and concentrated nitric acid as raw materials，with ammonium oxalate as precipitant，and hexadecyl trimethyl ammonium bromide as dispersant.Nano-sized Y₂O₃ particles were prepared by calcining the precursor in the air.The decomposition temperature of precursor was confirmed by DTA-TG.The product was characterized by XRD and SEM.The particle size distribution of the products prepared with different amount-of-substance ratios of reactants was measured by laser particle analyzer.Finally，the optimum preparation conditions of nano-sized Y₂O₃  were obtained.Under the optimum conditions，the nano-sized Y₂O₃  with average particle size of 40 nm could be prepared and the morphology was ellipsoidal.