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首页> 外文期刊>Surface Science >Auger electron spectroscopic study of the surface oxidation of uranium-niobium alloy {U-6wt.% Nb} in a UHV environment containing primarily H_2, H_2O and CO
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Auger electron spectroscopic study of the surface oxidation of uranium-niobium alloy {U-6wt.% Nb} in a UHV environment containing primarily H_2, H_2O and CO

机译:含H_2,H_2O和CO的特高压环境中铀铌合金{U-6wt。%Nb}的表面氧化的俄歇电子能谱研究

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摘要

Auger electron spectroscopy has been used to study the surface oxidation of a uranium-niobium alloy, U-6 wt.% Nb, in a UHV environment containing primarily H_2, H_2O and CO. For comparison, the reaction of the oxidative species with pure uranium and niobium metals has also been investigated. The observed changes of the shape and position of the Auger transition peaks for U, Nb and O following exposures this UHV environment up to 200 L, and under a continuous electron bombardment indicated that oxidation of the alloy leads, first, to the formation of a surface oxide consisting of UO_(2.0). The formation of this oxide was followed by the development of Nb-oxides (NbO, NbO_2 and NB_2O_5) at the metal-oxide interface. Pure uranium was found to exhibit faster oxidation kinetics than the alloy, while pure niobium oxidised at a much lower rate than the uranium based materials.
机译:在主要包含H_2,H_2O和CO的特高压环境中,利用俄歇电子能谱研究了U-6重量%Nb的铀铌合金的表面氧化。为进行比较,氧化性物种与纯铀的反应还研究了铌金属。在暴露于200 L的特高压环境后,观察到U,Nb和O的俄歇跃迁峰的形状和位置的变化,并在连续电子轰击下表明,合金的氧化首先导致形成由UO_(2.0)组成的表面氧化物。在形成该氧化物之后,在金属-氧化物界面处形成了Nb-氧化物(NbO,NbO_2和NB_2O_5)。发现纯铀比合金表现出更快的氧化动力学,而纯铌的氧化速率比铀基材料低得多。

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