采用椭偏光谱技术研究铀氧化动力学

Uranium Oxidation Kinetics by Spectroscopic Ellipsometry

摘要: 采用椭偏技术研究了45～95 ℃和5 kPa纯氧气氛中金属铀的氧化，通过不同温度下金属铀表面氧化层厚度随时间的变化规律，得到贫铀在初始氧化阶段的表面氧化层厚度与时间的关系均呈现抛物线规律；绘制出了在不同温度下金属铀表面的氧化动力学曲线，由此得到在低于100 ℃， 5 kPa的纯氧气氛下贫铀表面形成氧化物的反应活化能为87.165 kJ/mol。

Abstract: The oxidation kinetics of depleted uranium was studied in pure oxygen pressure of 5 kPa at below 100 ℃ by using spectroscopic ellipsometry(SE). The relationship of the thickness of uranium oxide with time is measured. The results indicate that below 100 ℃ in the initial period, the relationship between oxidation layer thickness and time is parabolic. The oxidation mechanism of depleted uranium is discussed and the active energy of depleted uranium at given experimental conditions is 87.165 kJ/mol from calculation.