本文采用TG、DTA和DSC法研究了La(NO_3)_3·6H_2O和Ce(NO_3)_3·6H_2O的热分解,并通过IR和X—射线法对反应物、中间产物和最后产物进行了鉴别,发现六水合物均经多个步骤脱水生成无水盐。生成的无水硝酸镧又经一系列中间产物的分解过程最后变成La_2O_3;而生成的无水Ce(NO_3)_3则直接分解成最终产物CeO_2。 In this paper, the thermal decomposition of La (NO_3) _3 · 6H_2O and Ce (NO_3) _3 · 6H_2O were studied by TG, DTA and DSC. The reactants, intermediates and final products were identified by IR and X- It was found that the hexahydrates were dehydrated in a number of steps to form anhydrous salts. The generated anhydrous lanthanum nitrate turns into La_2O_3 after a series of intermediate products decomposition, and the dehydrated Ce (NO_3) __3 decomposed directly into the final product CeO_2.