| 铀铌合金表面热氧化膜结构研究 |
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| 引用本文： | 罗丽珠,杨江荣,周萍. 铀铌合金表面热氧化膜结构研究[J]. 原子能科学技术, 2010, 44(9): 1047-1053. DOI: 10.7538/yzk.2010.44.09.1047 |
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| 作者姓名： | 罗丽珠 杨江荣 周萍 |
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| 作者单位： | 表面物理与化学国家重点实验室，四川 ;绵阳621907 |
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| 摘 要： | 采用X射线光电谱分析技术、结合Ar离子枪溅射,研究了大气环境、不同温度(室温、100、200和300℃)条件下铀铌合金样品表面氧化膜结构的变化情况。实验结果表明:随温度升高,氧化膜厚度增大,氧化膜结构发生明显变化。不同温度热氧化处理后,铀铌合金初始表面Nb主要以Nb2O5形式存在,在Nb2O5与金属Nb之间,总存在一定厚度的NbO及少量其他价态氧化物NbOx(0x1,1x2)的混合层。室温～200℃热氧化合金样品表面铀均以含间隙氧的UO2+x(P型)存在,其U4f7/2结合能较UO2低约0.7eV。室温条件下,氧化膜成分主要为UO2;100、200℃热氧化后,氧化膜中除UO2外,还含有少量P型UO2+x,其U4f5/2卫星峰的结合能为396.6eV。300℃热氧化后的合金样品表面为铀的高价氧化物(U3O8或UOx,2x3),U4f特征峰的结合能分别为381.8和392.2eV;氧化层为UO2和金属铀的混合物。热氧化过程中,温度对铀氧化的影响较对Nb的明显得多。
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| 关 键 词： | 铀铌合金 X射线光电谱 热氧化膜 |
Study on Thermo-Oxide Layers of Uranium-Niobium Alloy |
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| LUO Li-zhu,YANG Jiang-rong,ZHOU Ping. Study on Thermo-Oxide Layers of Uranium-Niobium Alloy[J]. Atomic Energy Science and Technology, 2010, 44(9): 1047-1053. DOI: 10.7538/yzk.2010.44.09.1047 |
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| Authors: | LUO Li-zhu YANG Jiang-rong ZHOU Ping |
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| Affiliation: | National Key Laboratory for Surface Physics and Chemistry, P. O. Box 718-35, Mianyang 621907, China |
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| Abstract: | Surface oxides structure of uranium niobium alloys which were annealed under different temperatures (room temperature, 100, 200, 300 ℃, respectively) in air were studied by X-ray photoelectron spectroscopy (XPS) analysis and depth profile. Thickness of thermo-oxide layers enhance with the increasing oxide temperature, and obvious changes to oxides structure are observed. Under different delt temperatures, Nb2O5 are detected on the initial surface of U-Nb alloys, and a layer of NbO mixed with some NbOx(02O5 and Nb metal. Dealing samples in air from room temperature to 200 ℃, non-stoichiometric UO2+x(UO2 + interstitial oxygen, P-type semiconductor) are found on initial surface of U-Nb alloys, which has 0.7 eV shift to lower binding energy of U 4f7/2 characteristics comparing to that of UO2. Under room temperature, UO2 are commonly detected in the oxides-layer,while under temperature of 100 and 200 ℃, some P-type UO2+x are found in the oxide layers, which has a satellite at binding energy of 396.6 eV. When annealing at 300 ℃, higher valence oxides, such as U3O8 or UOx (25/2 and U 4f7/2 peaks are 392.2 and 381.8 eV, respectively. UO2 mixed uranium metal are the main compositions in the oxide layers. From the results, influence of temperature to oxidation of uranium is more visible than to niobium in uranium-niobium alloys. |
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| Keywords: | U-Nb alloy X-ray photoelectron spectroscopy them-oxide layers |
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