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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >DETERMINATION OF THE ACTIVATION ENERGY FOR THE FORMATION OF U3O8 ON UO2
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DETERMINATION OF THE ACTIVATION ENERGY FOR THE FORMATION OF U3O8 ON UO2

机译：在UO2上形成U3O8的活化能的测定

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Published data for the activation energy of U3O8 formation on UO2 are critically reviewed. The range in reported activation energies is very wide (48-194 kJ mol(-1)) because of improper deconvolution of the first and second stages of UO2 oxidation and because of the complex temperature dependence of the reaction kinetics, A general method is then presented for quantitative analysis of nucleation-and-growth kinetics by using X-ray diffraction to measure the rate of product formation on a flat surface. This quantitative method is then used to analyze the kinetic data for the formation of U3O8 on the surface of UO2 disks over the range 168-300 degrees C. The resulting Arrhenius plot is linear, and the activation energy for U3O8 formation was found to be 146 +/- 10 kJ mol(-1) (90% confidence interval). The quantitative procedure developed herein can be used to estimate the rate of U3O8 formation at low (< 175 degrees C) temperatures, and thus makes an important contribution to the safe dry air storage of used nuclear fuel. (C) 1997 Elsevier Science B.V. [References: 39]
机译：严格审查了有关UO2上U3O8形成活化能的公开数据。由于第一阶段和第二阶段UO2氧化反应的反卷积不当以及反应动力学对温度的复杂依赖性，报告的活化能范围非常宽（48-194 kJ mol（-1））。通过使用X射线衍射测量平坦表面上产物形成的速率，提出了用于成核和生长动力学定量分析的方法。然后使用这种定量方法分析在168-300摄氏度范围内UO2圆盘表面上U3O8形成的动力学数据。所得的Arrhenius图是线性的，发现形成U3O8的活化能为146 +/- 10 kJ mol（-1）（90％置信区间）。本文开发的定量程序可用于估计在低温（<175摄氏度）下U3O8的形成速率，从而对用过的核燃料的安全干燥空气存储做出了重要贡献。 （C）1997 Elsevier Science B.V. [参考：39]

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