UF_4在氧或湿氧中热化学反应研究  

UF_4 and Its Thermal Chemical Reaction Activation in O_2 or RH93%+O_2

作　　者：仲敬荣[1] 余春荣[1] 任一鸣[1] 柏云[1] 

机构地区：[1]中国工程物理研究院材料研究所,四川江油621907

出　　处：《原子能科学技术》2016年第1期11-17,共7页Atomic Energy Science and Technology

基　　金：国家安全某重大基础研究项目资助;中国工程物理研究院发展基金资助项目(2011A0301003)

摘　　要：采用显微激光拉曼光谱技术、称重及形貌观察等手段,开展了UF4在氧气或相对湿度93%湿氧气氛中的热化学反应实验研究,获取了UF4不同温度时效后的质量、颜色及失重情况,以及反应前后不同铀化合物的拉曼光谱。结果表明：UF4在氧气或湿氧中加热至200℃时,性质稳定,其拉曼光谱基本无变化;250-600℃时,样品表面颜色发生明显变化。拉曼光谱分析发现,在氧气气氛中有UO2F2、UO2、U3O8,在湿氧气氛中有UO2F2、UO2F2·2H2O、UO2F2·nH2O、UO2、U3O8等多种铀化合物生成。随着温度的升高,UF4在氧气中的化学反应速率呈现由慢到快再到慢的变化趋势。The dynamics of the thermal chemical reactions of UF-4 in oxygen or hydrated（relative humidity of 93%）oxygen environments were studied by micro-laser Raman spectroscopy（MLRS）,gravimetry and topology techniques.The variabilities about mass and color of UF-4 were obtained at different temperatures and time,and the Raman spectra were also obtained for the reactants and the products.In both conditions,UF-4 is stable at 200℃ with nearly no changes in its Raman spectra.However the Raman spectra suggest the formation of UO-2F-2,UO-2 and U-3O-8in oxygen and UO-2F-2,UO-2F-2·2H-2O,UO-2F-2·nH-2O,UO-2 and U-3O-8in the hydrated oxygen at 250-600 ℃.On the other hand,the chemical reaction rate of UF-4 in oxygen shows the trend from slow to fast and then to slow.

关 键 词：UF4 拉曼光谱 化学反应 氧气 湿氧 

分 类 号：TL271[核科学技术—核燃料循环与材料] O612.7[理学—无机化学]