Uranium–Americium oxides U_1−yAm_yO_2±x are currently investigated as possible transmutation targets for next generation nuclear reactors. In the context of a comprehensive investigation of the thermodynamic and thermal properties of these materials, their behaviour in oxidizing conditions is here investigated for the first time. The results of high-temperature X-ray diffraction measurements in air are here presented. A wide composition domain of the solid solution has been investigated, measuring U_1−yAm_yO_2±x oxides with Am/(Am + U) ratios ranging from 0.10 to 0.67. This allowed determining the effect of the americium content on the oxidation kinetics in air. Specifically, it will be shown that americium hinders the formation of the M₄O₉ and M₃O₈ phases.

目前正在研究铀-氧化物U ₁ - _y Am _y O _{2± x}作为下一代核反应堆的可能possible变目标。在对这些材料的热力学和热学性质进行全面研究的背景下，本文首次研究了它们在氧化条件下的行为。本文介绍了在空气中进行高温X射线衍射的结果。已经研究了固溶体的宽组成域，测量的是U _{1− y} Am _y O _{2± x}Am /（Am + U）比在0.10至0.67之间的氧化物。这可以确定determining含量对空气中氧化动力学的影响。具体而言，将显示a阻碍了M ₄ O ₉和M ₃ O ₈相的形成。