燃烧剂对低温燃烧合成Pr-CeO_2粉体结构与性能的影响  

Influence of Combustion Additive on the Structure and Properties of Pr-CeO_2 Powder Prepared by Low-temperature Combustion Synthesis (LCS)

作　　者：朱振峰[1] 王宝利[1] 李静平[1] 何选盟[1] 羊俊[1] 马建中[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021

出　　处：《人工晶体学报》2007年第2期443-447,共5页Journal of Synthetic Crystals

基　　金：陕西省科技攻关项目(2005k06-G4)资助;咸阳市科技攻关项目(K05010-6);陕西科技大学科研创新基金(SUST-B06)资助

摘　　要：以乙酸铵和柠檬酸为燃烧剂，Ce（NO3）3-6H2O和Pr6O11为主要原料，采用低温燃烧法（LCS）制备了Ce0.95Pr0．5O2纳米晶粉体。用DSC、XRD、SEM及色度测试等手段研究了Ce0.95Pr0．5O2纳米晶微粒前驱体的着火温度、产物晶体结构、晶体形貌及色度。结果表明：乙酸铵和柠檬酸作为燃烧剂的反应前驱体着火温度分别在250℃和300℃左右。两种燃烧产物均为单一的萤石型固溶体。与柠檬酸相比，乙酸铵作为燃烧剂得到的燃烧产物结晶程度更完善、Pr离子进入CeO2晶格的含量更多、呈色更好，且颗粒的团聚程度变小。根据Scherrer公式计算，用两种燃烧剂制备产物的平均晶粒尺寸分别为20-30nm和10-15nm，为纳米晶颗粒。最后得到Ce0.95Pr0.5O2粉体的颗粒尺寸则在200-300nm之间。乙酸铵与硝酸铈的最佳摩尔配比为2：1，柠檬酸与硝酸铈的最佳摩尔配比为3：1。Ce0.95Pr0.05O2 nano-crystallites were prepared by low-temperature using citric acid and acetic ammonium as combustion additive and Ce （NO3 combustion synthesis （LCS） ）3·6H2O and Pr6O11 as raw materials. The ignition temperature, crystalline structure, morphologies and the coloring properties of the as-prepared nano-crystallites were characterized by DSC, XRD, SEM and colorimeter. Results show that the ignition temperature of the two kinds of precursors prepared by using acetic ammonium and citric acid as combustion additive is about 250℃ and 300℃ respectively. The Ce0.95Pr0.05O2 solid solutions prepared from the two precursors both exhibit a fluorite crystal structure. Their average crystallite size is about 20- 30nm and 10-15nm from Scherrer formula, and the particle size of Ce0. 95 Pr0. 5 O2 powder is about 200- 300nm, Comparing with the crystallites prepared by using citric acid as combustion additives, the crystallinity, color performance, Pr ion content in CeO2 crystal lattice and the agglomerates of those crystallites prepared by using acetic ammonium are obviously improved. The best tool ratio of acetic ammonium/cerium nitric and citric acid/cerium nitric is 2：1 and 3：1 respectively.

关 键 词：Pr-CeO2 低温燃烧合成(LCS) 乙酸铵 柠檬酸 

分 类 号：TQ174[化学工程—陶瓷工业]