镧系元素（III）和锕系元素（III）重铬酸盐热分解的新认识：从钕和铈到钚
New insights on the thermal decomposition of lanthanide(III) and actinide(III) oxalates: from neodymium and cerium to plutonium
摘要：
镧系元素常被用作研究锕系化合物性质的替代物。它们的行为被认为是非常相似的，因为它们都具有f价电子，并且在尺寸和化学性质上接近。本研究探讨了潜在的使用两个镧系元素（钕和铈）作为替代品的钚在热分解的同晶草酸盐化合物，在三价氧化态，成氧化物。因此，在氧化和惰性气氛下，钕，铈和钚（III）的重铬酸盐的热分解研究了几个耦合热分析（TG-DTA/DSC-MS/FT-IR）和补充表征技术（XRD，UV-vis，FT-IR，SEM，碳分析仪）。在这项研究中确定的热分解机制证实了文献中报道的一些以前的结果，在不同的命题，同时也阐明了一些原来的机制没有考虑。计算的热力学和动力学参数的研究系统在这两种气氛下的报告，并与现有的文献数据进行比较。钚（III）和镧系元素（III）的氧化物的热行为之间的异同进行了概述。
英文摘要：
Lanthanides are often used as surrogates to study the properties of actinide compounds. Their behaviour is considered to be quite similar as they both possess f valence electrons and are close in size and chemical properties. This study examines the potential of using two lanthanides (neodymium and cerium) as surrogates for plutonium during the thermal decomposition of isomorphic oxalate compounds, in the trivalent oxidation state, into oxides. Thus, the thermal decomposition of neodymium, cerium and plutonium (III) oxalates are investigated by several coupled thermal analyses (TG-DTA/DSC-MS/FT-IR) and complementary characterisation techniques (XRD, UV-vis, FT-IR, SEM, carbon analyser) under both oxidizing and inert atmosphere. The thermal decomposition mechanisms determined in this study confirmed some previous results reported in the literature, among diverging propositions, while also elucidating some original mechanisms not previously considered. Calculated thermodynamic and kinetic parameters for the studied systems under both atmospheres are reported and compared with available literature data. Similarities and differences between the thermal behaviour of plutonium(III) and lanthanide(III) oxalates are outlined.
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