氘/氚化铀热解吸的动力学同位素效应  

Kinetic Isotope Effects of Desorption for Uranium Deuteride and Uranium Tritide

作　　者：黄刚[1] 龙兴贵[1] 梁建华[1] 刘文科[1] 杨本福[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《原子能科学技术》2010年第8期926-929,共4页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(50871106)

摘　　要：在高真空金属系统上测定了氘/氚化铀在恒容体系和225～400℃范围内热解吸的压力-时间等温线,应用反应速率分析方法计算了各自在不同温度下的速率常数。随着温度的升高,热解吸反应的速率增大,反应的平衡压随之增高。由速率常数计算得到氘/氚化铀热解吸的表观活化能分别为(26.3±0.4)kJ/mol和(27.7±0.6)kJ/mol。活化能数据显示,氘/氚化铀热解吸反应的动力学同位素效应不明显。Desorption p-t curves of uranium deuteride and uranium tritide were investigated at 225-400 ℃ by using the method of the reaction rate analysis in a constant volume system.The desorption rate constants of uranium deuteride and uranium tritide at different temperatures were determined.The rate of desorption is augmentable along with the increase of temperature and the equilibrium pressure of reaction is increased too.The activation energies of desorption for uranium deuteride and uranium tritide are（26.3±0.4）kJ/mol and（27.7±0.6）kJ/mol,respectively.The data of activation energy indicate that there are no remarkable kinetic isotope effects of desorption for uranium deuteride and uranium tritide.

关 键 词：氘化铀 氚化铀 热解吸 同位素效应 

分 类 号：O642.31[理学—物理化学]