Résumé
An interesting approach for nanoscale materials synthesis was the investigation of the low-temperature thermal process. In this scheme, self-propagating high temperature synthesis (SHS) and combustion synthesis (CS) can be considered as specific type in this thermal process for the synthesis of metal oxide. A specific and interesting way combines sol-gel process and combustion process and allow the conversion of actinides or surrogates nitrates (gadolinium nitrate) into oxides. Three fuels (glycine, urea and citric acid) having various chemical properties (carboxylate or amine function) were used as reducing agent. In the first step, the sol-gel precursor obtained below the ignition temperature was characterized by IR spectroscopy to observe fuel-nitrate complex formation. The sol-gel swelling was quantitatively measured and its thermal transformation into oxide was analyzed by TG-TDA. The final oxide was characterized by BET, XRD and SEM. This approach shows the considerable effect and the potential control on the structural characteristics of the final oxide powder through the nature of the fuel acting as reducing agent, pH solution, temperature rate…