(北京有色金屬研究總院 有研稀土新材料股份有限公司，
北京 100088)
摘 要: 用碳酸氫銨作沉淀劑通過添加NH4NO3和(NH4)2CO4兩種不同的試劑制備了超細(xì)CeO2粉體。 采用X射線衍射、 BET和激光散射的方法研究了不同灼燒溫度下粉體粒徑的變化規(guī)律， 并研究了粉體粒徑對紫外線吸收的影響。 結(jié)果表明： NH4NO3和(NH4)2CO4作為添加劑可以制得一次粒徑在10~100 nm的納米粉體， 團(tuán)聚粒徑在200~300 nm分散性好的超細(xì)CeO2粉體。 X射線衍射和BET測得的一次粒徑隨灼燒溫度升高呈明顯增大的趨勢， 激光散射測得的團(tuán)聚粒徑隨灼燒溫度變化不明顯。 CeO2粉體分散在去離子水中的吸收光譜研究表明， 粉體一次粒徑大小對光的吸收效果有明顯影響， 粒徑小， 紫外線吸收效果好， 可見光穿透性強(qiáng)， 粒徑增大， 粉體將失去紫外線吸收效果， 紫外吸收受粉體的團(tuán)聚粒徑影響不大。
關(guān)鍵字: 超細(xì)CeO2粉體; 制備; 紫外吸收
ZHANG Shun-li, ZHANG Guo-cheng
（ Grirem Advanced Materials Co. Ltd, General Research Institute for
Nonferrous Metals, Beijing 100088, China）
Abstract: Ultra-fine CeO2 particle-sized powders were prepared by precipitation method with bicarbonate as precipitant while NH4NO3 and (NH4)2CO4 serve as additives, respectively. The variant regularity of particle size with calcinations temperatures was studied by XRD, BET and Lazer Scattering methods. The results show that nano-particle sized CeO2 with primary particle size of 10-100 nm and aggregated particle size of 200-300 nm can be obtained while NH4NO3 and (NH4)2CO4 serves as additive. The primary particle size determined by XRD and BET method increases significantly with temperature, however the secondary particle size dose not change appreciably analyzed by laser scattering method. As CeO2 dispersed in de-ionized water, ultra violet(UV)-visible absorbance spectrum was applied to study its absorbance characters. The study finds that it has good UV absorbance and visible light transparency as CeO2 powder with an ultra-fine particle size. UV absorbance is greatly influenced by the primary particle size. With the primary particle size increase, the UV absorbance weakens markedly. The secondary particle size has little influence on its UV absorbance.
Key words: ultra-fine CeO2; preparation; ultra violet absorbance
