【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;250⁶00℃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。更多还原

【Abstract】 The dynamics of the thermal chemical reactions of UF₄ 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 UF₄ were obtained at different temperatures and time,and the Raman spectra were also obtained for the reactants and the products.In both conditions,UF₄ is stable at 200℃ with nearly no changes in its Raman spectra.However the Raman spectra suggest the formation of UO₂F₂,UO₂ and U₃O₈in oxygen and UO₂F₂,UO₂F₂·2H₂O,UO₂F₂·nH₂O,UO₂ and U₃O₈in the hydrated oxygen at 250-600 ℃.On the other hand,the chemical reaction rate of UF₄ in oxygen shows the trend from slow to fast and then to slow.更多还原