氨基多羧酸配合物前驱体的热分解行为研究  

Thermal Decomposition of Polyaminocarboxylate Complex Precursor

作　　者：宋朝文[1,2] 黄端平[2] 张枫 

机构地区：[1]中国船舶重工集团公司第七一二研究所,湖北武汉430064 [2]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《陶瓷学报》2013年第2期196-200,共5页Journal of Ceramics

摘　　要：采用氨基多羧酸配合物法合成La2NiO2粉体，利用XRD、TG—DTA、IR、FESEM等测试方法对合成产物进行表征，并探讨氨基多羧酸配合物前驱体的热分解行为。研究结果表明，氨基多羧酸配合物前驱体为非晶态结构，前驱体中DTPA与金属阳离子形成双齿配位结构。配合物前驱体热分解后先形成中间产物（LaO）．CO。和NiO，进一步加热中间产物（Lao）2cO3即分解为La2O5。当热处理温度达到700℃时，合成产物中形成了K2NiF结构的LazNiO2，但同时还存在少量杂相；经900℃热处理后合成产物形成单一K2NiF4相的La2NiO6，合成粉料的颗粒细小、均匀（-100nm）。La2NiO. powder was prepared by a polyaminocarboxylate complex method. XRD, TG-DTA, IR and FESEM were employed to investigate the thermal decomposition of the precursor. The results indicate that the precursor has an amorphous nature, with the coordination of DTPA and metal cations forming a bi-dentate complex. With the temperature increasing, the complex precursor first decomposed into a mixture of NiO and intermediate （LaO）2CO3, and then transformed into La2Os at the temperatures above 600℃. Further increasing the temperature to 700℃ yielded La2NiO4 phase with small amounts of intermediate phases （LaNiO3 and La203）. Homogeneous and fine powder （100nm） with pure K2NiF4 phase could be produced by calcining the complex precursor at 900℃.

关 键 词：La2NiO4+δ 混合导体 氨基多羧酸配合物法 热分解 

分 类 号：TQ174.75[化学工程—陶瓷工业]