摘要：以Eu₂O₃,Y₂O₃为原料通过柠檬酸溶胶-凝胶法合成了Y₂O₃:Eu³⁺纳米粉,研究了pH值、柠檬酸用量(n[H₃Cit]:n[Y³⁺+Eu³⁺])及煅烧温度对粉体制备过程的影响。利用TG-DTA、XRD、SEM等测试手段对粉体的形成过程进行了分析。结果表明:Y₂O₃:Eu³⁺纳米粉体的一次粒径为25nm左右,二次粒径为250nm左右。纳米Y₂O₃:Eu3+粉体制备最佳实验条件为pH=5,n[H₃Cit]:n[Y³⁺+Eu³⁺]为2:1,煅烧温度为600℃。

关键词： 溶胶-凝胶法;Y₂O₃:Eu³⁺纳米粉体;柠檬酸

Abstract: The nano-sized Y₂O₃:Eu³⁺ particles were prepared by citric sol- gel process using Eu₂O₃ and Y₂O₃ as starting materials. The effects of pH value, the molar ratio of citric acid and metal ions and calcining temerature on the nano-sized Y₂O₃: Eu³⁺ particles were studied. The crystallization process of the Y₂O₃: Eu³⁺ particles was investigated by means of TG- DTA, XRD and SEM. The results show that the crystal size of Y₂O₃: Eu³⁺ particles is about 25 nm and the secondary grain size is about 250 nm. The appropriate preparing conditions are that pH value is 5, the ratio of citric acid and metal ions is 2:1 and the annealing temper- ature is 600 ℃. 

Keywords: sol- gel process; Y₂O₃: Eu³⁺ nano-particles; citric acid