【作者】 王晓方； 胡殷； 龙重； 宾韧； 杨瑞龙； 李芳芳； 潘启发； 罗丽珠； 刘柯钊；

【Author】 Xiaofang Wang;Yin Hu;Zhong Long;Ren Bin;Ruilong Yang;Fangfang Li;Qifa Pan;Lizhu Luo;Kezhao Liu;Science and Technology on Surface Physics and Chemistry Laboratory;

【机构】 表面物理与化学重点实验室；

【摘要】 铀氮化物（包括UN,UN₂,U₂N₃）不仅在力学性质、机械性能方面表现优良,还具备熔点高、导热性好等特点,被认为是未来第四代核燃料的重要备选材料^[1]。然而,在反应堆工作温度范围内,氮的失去可能会影响铀氮化物的稳定性,进而限制铀氮化物的实际应用^[2]。本文采用热脱附谱（TDS）、XPS、AES以及XRD等方法研究了富氮铀氮化物(UN_2-x)^[3]在超高真空下(本底真空优于10^-7Pa)升温至900℃的热分解过程。初步结果表明:UN_2-x中N₂的脱附温度分别处于239℃、450℃和765℃附近。降温后的产物分析表明,UN_2-x分解为UN。更多还原

【Abstract】 Uranium nitride（UN,UN₂,U₂N₃） has been considered as a potential fuel for Generation IV nuclear reactor systems due to its favorable physical and chemical properties^[1].However,nitrogen would lose from uranium nitride at the reactor working temperature^[2].This may affect the stability and integrity of fuel,which limit the practical applications of uranium nitride.In this work,thermal decomposition processes of nitrogen-rich uranium nitride(denoted as UN_2-x)^[3]under ultra-high vacuum condition at elevated temperature were studied by TDS,XRD,XPS and AES methods.The preliminary results show that the desorption temperatures of N₂ from UN_2-x are located at about 239 ℃,450 ℃ and 765℃,respectively,and XPS,AES and XRD analysis show that UN_2-x is decomposed into UN.更多还原