An in situ heating system was built for the Auger electron spectroscopy to investigate the thermal effect of Auger lines. A GaN sample was studied in this system. The kinetic energy of Ga LMM and MVV Auger lines were ...An in situ heating system was built for the Auger electron spectroscopy to investigate the thermal effect of Auger lines. A GaN sample was studied in this system. The kinetic energy of Ga LMM and MVV Auger lines were observed to shift negatively with temperature increasing. By using ab initio calculation, the theoretical Ga MVV Auger line shape was fit, which well reflects the inner property of the line. The Auger shift with heating is related with the valence electron rearrangement in the thermal expansion of the local bonds.展开更多
锂离子电池在研发和使用过程中,材料的表界面特性及其演变行为直接影响了电池的性能和应用。采用恰当的表面分析技术解析锂离子电池体系中表界面的组分、结构以及分布,有利于更好地探究界面性能优化,研究离子传输行为,以及分析电池失效...锂离子电池在研发和使用过程中,材料的表界面特性及其演变行为直接影响了电池的性能和应用。采用恰当的表面分析技术解析锂离子电池体系中表界面的组分、结构以及分布,有利于更好地探究界面性能优化,研究离子传输行为,以及分析电池失效机制。俄歇电子能谱(Auger electron spectroscopy,AES)是一种具有较高空间分辨率的电子束探针表面分析技术,可实现除H和He以外的大部分元素及其价态的定性和半定量分析,以及二维成像表征。本文介绍了俄歇电子能谱的技术原理、主要功能及分析方法,总结了其在锂离子电池研究中的应用案例及相关技巧,为AES表征技术在锂电池领域的广泛合理应用总结了经验,同时对AES技术在该领域的应用发展进行了展望。展开更多
Auger Electron Spectroscopy was used to characterize the initial stages of the oxidation of Ce-5% La alloy in an oxygen atmosphere at low pressure( ～ 10-6 Pa) and room temperature after the surface is cleaned by Ar+ ...Auger Electron Spectroscopy was used to characterize the initial stages of the oxidation of Ce-5% La alloy in an oxygen atmosphere at low pressure( ～ 10-6 Pa) and room temperature after the surface is cleaned by Ar+ ion bombardment.It is shown that exposure of clean cerium to oxygen causes the appearance and development of three new Auger peaks at 97,662 and 676 eV, which steadily grow during oxidation of cerium.Upon oxygen dose less than 20 L,a semi-protective layer of oxide forms on the surface of cerium and its growth follows a logarithmic relationship.With further exposure of oxygen, the oxide film grown in the previous stage becomes thicker and the uptake of oxygen reaches saturation at oxygen exposure of 25 L,and the oxide film mainly consists of Ce2O3.展开更多
基金The author would like to express thanks to Professor Jun-yong Kang and Dr. Duan-jun Cai for their valuable discussions. This work was partly supported by the National Nature Science Foundation of China （No.60206030, No.10134030 and No.69976023） and the Natural Science Found of Xiamen University （No.B200337）.
文摘An in situ heating system was built for the Auger electron spectroscopy to investigate the thermal effect of Auger lines. A GaN sample was studied in this system. The kinetic energy of Ga LMM and MVV Auger lines were observed to shift negatively with temperature increasing. By using ab initio calculation, the theoretical Ga MVV Auger line shape was fit, which well reflects the inner property of the line. The Auger shift with heating is related with the valence electron rearrangement in the thermal expansion of the local bonds.
文摘锂离子电池在研发和使用过程中,材料的表界面特性及其演变行为直接影响了电池的性能和应用。采用恰当的表面分析技术解析锂离子电池体系中表界面的组分、结构以及分布,有利于更好地探究界面性能优化,研究离子传输行为,以及分析电池失效机制。俄歇电子能谱(Auger electron spectroscopy,AES)是一种具有较高空间分辨率的电子束探针表面分析技术,可实现除H和He以外的大部分元素及其价态的定性和半定量分析,以及二维成像表征。本文介绍了俄歇电子能谱的技术原理、主要功能及分析方法,总结了其在锂离子电池研究中的应用案例及相关技巧,为AES表征技术在锂电池领域的广泛合理应用总结了经验,同时对AES技术在该领域的应用发展进行了展望。
文摘Auger Electron Spectroscopy was used to characterize the initial stages of the oxidation of Ce-5% La alloy in an oxygen atmosphere at low pressure( ～ 10-6 Pa) and room temperature after the surface is cleaned by Ar+ ion bombardment.It is shown that exposure of clean cerium to oxygen causes the appearance and development of three new Auger peaks at 97,662 and 676 eV, which steadily grow during oxidation of cerium.Upon oxygen dose less than 20 L,a semi-protective layer of oxide forms on the surface of cerium and its growth follows a logarithmic relationship.With further exposure of oxygen, the oxide film grown in the previous stage becomes thicker and the uptake of oxygen reaches saturation at oxygen exposure of 25 L,and the oxide film mainly consists of Ce2O3.
