【摘要】 金属铀的表面极活泼,易氧化腐蚀。为降低金属铀表面的活性,人们曾尝试采用真空热氧化的办法在其表面形成所谓的一氧化铀。应用X射线光电子能谱（X-ray Photoelectron Spectroscopy,XPS）和俄歇电子能谱（Auger Electron Spectroscopy,AES）研究了金属铀真空热氧化膜及其在大气中腐蚀的产物。分析结果得到金属铀真空热氧化膜主要含有二氧化铀（UO₂）和含氧碳化铀相(UC_xO_1-x)。采用AES相对灵敏度因子法计算出UC_xO_1-x相组成近似为UC_0.41±0.04O_0.62±0.01。真空热氧化膜中的含氧碳化铀相在大气中会继续氧化腐蚀并产生二氧化铀和非束缚态碳。讨论了表面含氧碳化铀相对金属铀腐蚀性能的影响,认为表面含氧碳化铀相的存在是延缓金属铀在大气气氛中腐蚀的关键因数。更多还原

【Abstract】 The oxide layer of uranium metal formed by vacuum heating were examined with X-ray photoelectron spectroscopy (XPS) and Auger Electron Spectroscopy (AES). XPS results indicated that the air-exposed surface of the oxide layer were mainly consisted of UO2 and free carbon. After the air-exposed surface were removed by low energy argon ion sputtering, Cls spectra shifted from 284.8 eV to 281.8 eV, indicating the existence of carbide phase. AES results of C (KVV) Auger transitions confirmed this result. Resolved and fitted using a combination of Gaussian and Lorentzian peak shape, U4f7/2 spectra showed that three uranium chemical states existed in the layer, there were uranium dioxide, uranium carbide (or oxycarbide, UCxO1-x) and uranium metal phase. Calculated the AES data by relatively sensitive factor, the composition of oxycarbide was given as更多还原