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中文摘要：
利用红外（限）光谱、X射线衍射（XRD）及透射电子显微镜（TEM）等手段，对有机羧酸在尿素及硝酸铈的均相反应混合溶液中所起的配位作用进行了分析，并对产品的物相和形貌进行了测试与表征。实验结果表明：在尿素及硝酸铈的混合溶液中分别加入一元羧酸硬脂酸，二元羧酸酒石酸和三元羧酸柠檬酸时，一元羧酸硬脂酸在混合溶液中只起表面活性剂的作用，其产物为斜方晶系的单晶Ce2O（CO3）2·H2O微粉，且表面活性剂硬脂酸的加入使得晶体的晶化程度明显提高；而二元羧酸酒石酸与三元羧酸柠檬酸在均相反应中则起螯合剂的作用，分别与Ce^3＋形成螯合物酒石酸铈和柠檬酸铈，这些结果的造成是由于其反应机理的不同所导致的。
英文摘要：
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· 6H2O 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· H2O with a high crystallization degree. In turn, duality-carboxylic acid tartaric acid and tri-carboxylic acid citric acid were combined with Ce^3＋ to form chelate citric acid and cerium tartaric acid, respectively. The results were caused by different mechanisms of reaction in the solution.
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