铌酸钠亚微米粉体的低温合成及形貌控制  

Low-temperature Synthesis of NaNbO_3 Ultrafine Powder and Morphology Control

作　　者：杨海波[1] 林营[1] 王芬[1] 罗宏杰[2] 

机构地区：[1]陕西科技大学材料科学与工程学院 [2]中科院上海硅酸盐研究所,上海200050

出　　处：《武汉理工大学学报》2007年第7期58-61,113,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50372037);陕西科技大学自选项目(ZX05-21)

摘　　要：以柠檬酸为配位剂与金属离子配合,水作为溶剂,乙二醇为酯化剂,通过聚合物前驱体法制备NaNbO3粉体。研究了柠檬酸(CA)和乙二醇(EG)的用量和pH值对溶胶性能的影响。采用XRD和TG-DTA研究了NaNbO3晶相的形成过程,利用TEM对所制得粉体的表面形貌进行了分析。结果表明:当前驱体溶胶的pH值为7.5,n(CA)∶n(metalion)=3∶1,n(CA)∶n(EG)=1∶2时,可以获得稳定性能良好的溶胶。凝胶前驱体在加热过程中先反应生成Na2O和Na2Nb4O11,然后二者反应生成NaNbO3。不同的升温速率对所得的粉体的形貌影响较大,升温速率快,有利于粒状产物的形成,慢的升温速率易形成棒状产物。并讨论了不同的烧结机制影响NaNbO3形貌的原因。With citric acid as chelating agent, ethylene alcohol as etherification agent and water as solvent, NaNbO3 ultrafine powder was synthesized by polymeric precursor method, The effects of amount of CA and EG, pH value on the stability of the precursor sol were investigated. The evolution of NaNbO3 crystal phase was also investigated by XRD and TG-DTA, The results showed that a homogeneous precursor sol was formed at in the case of n（CA） ： n （metal ion） = 3：1, n（CA） ： n（EG） = 1 ： 2and pH = 7.5, Sintering process largely influences the morphology of the prepared products. Grain-llke nanoparticles could be obtained with a rapid temperature rising rate, while rod-like ultrafine grains were obtained with a slow rate, The forming mechanism of different morphologies of the prepared nanoparticles was also discussed.

关 键 词：铌酸钠 粉体 聚合物前驱体法 柠檬酸 

分 类 号：TB383[一般工业技术—材料科学与工程]