Mei Yan, Nie Zuo-ren, Wang Wei
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2007 Feb;27(2):254-8.
Infrared (IR) spectrum, X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to study and characterize the coordination mechanisms, products and morphology of organic carboxylic acid during homogeneous precipitation in the system of Ce(NO3)2 x 6 H2O and urea solution. The results showed that monocarboxylic acid stearic acid played a role of surfactant, and the product was still orthorhombic Ce2O(CO3)2 x H2O with a high crystallization degree. In turn, duality-carboxylic acid tartaric acid and tri-carboxylic acid citric acid were combined with Ce3+ to form chelate citric acid and cerium tartaric acid, respectively. The results were caused by different mechanisms of reaction in the solution.
采用红外光谱（IR）、X射线衍射（XRD）和透射电子显微镜（TEM）对Ce(NO3)2·6H2O与尿素溶液体系中均相沉淀过程中有机羧酸的配位机制、产物及形态进行了研究和表征。结果表明，一元羧酸硬脂酸起到了表面活性剂的作用，产物仍为结晶度较高的正交晶系Ce2O(CO3)2·H2O。相反，二元羧酸酒石酸和三元羧酸柠檬酸分别与Ce3+结合形成螯合物柠檬酸铈和酒石酸铈。这些结果是由溶液中不同的反应机制导致的。
