H_2气氛中铀金属表面反应的XPS研究

STUDY ON THE SURFACE REACTION OF URANIUM METAL IN HYDROGEN ATMOSPHERE WITH XPS

用Ｘ射线光电子能谱（ＸＰＳ）分析研究了在Ｈ２气氛中，２５℃和２００℃时的铀金属表面反应。实验表明，在２５℃条件下，由于痕量水汽的作用，铀金属表面主要发生氧化反应；在２００℃时发生氧化反应的同时，还发生氢化反应，并且氢化反应随Ｈ２进气量的增加而加强。氢化反应产物ＵＨ３的Ｕ４ｆ７／２结合能为３７８．６ｅＶ。当Ｈ２中含有一定量的ＣＯ气体时，表面氢化反应和氧化反应均受到抑制。

he surface reactions of uranium metal in hydrogen atmosphere at 25℃ and 200℃ and effects of temperature and carbon monoxide to the hydriding reaction have been studied by X-ray photoelectron spectroscopy (XPS).The reaction between H_2 and uranium metal at 25℃ leads to the further oxidation of surface layer of metal due to traces of water vapor.At 200℃,it may lead to the hydriding reaction of uranium and the hydriding increases with increasing exposure to H_2 in the initial stages.The U4f7/2binding energy of UH_3 has been found to be 378.6 eV.Investigation indicates carbon monoxide inhibits both the hydriding reaction and oxidation on the condition of H_2CO atmosphere.