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本文利用TG-DTA-DTG技术对除了钪、钷以外的十五种希土异硫氰酸盐与二甲基乙酰胺的固体配合物进行了热分析研究。测定了它们的熔点和熔化热,分别用Doyle法和Kissinger法计算出各配合物热分解过程氧化反应的活化能,两种方法所得结果基本一致。实验发现镧系元素的该系列配合物的熔化热和热分解反应的活化能均随配合物中心离子—镧系元素原子序数的递增而呈现“双峰现象”。
In this paper, TG-DTA-DTG technique was applied to the thermal analysis of the solid complexes of fifteen rare earth isothiocyanates and dimethylacetamide, except scandium and limonium. Their melting points and heat of fusion were measured. The activation energies of the oxidation reactions of the complexes during thermal decomposition were calculated by Doyle’s method and Kissinger’s method, respectively. The results obtained by the two methods were basically the same. It was found that the activation energies of the heat of fusion and the thermal decomposition of the Lanthanide series complexes all presented a “bimodal phenomenon” with the increase of the atomic number of lanthanide elements in the center of the complex.