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
The comet assay (single cell gel electrophoresis assay) was used to evaluate the radiotoxicity of Augerelectron emitters in the human osteosarcoma cell line (HOS-8603). After internal exposure to 67Ga-EDTMP, the sar-c...The comet assay (single cell gel electrophoresis assay) was used to evaluate the radiotoxicity of Augerelectron emitters in the human osteosarcoma cell line (HOS-8603). After internal exposure to 67Ga-EDTMP, the sar-coma cell has been injured severely. The comet length was longer along with the increase of dose, the appearance ofcomet tail was different from that with respect to the 60Co γ-ray irradiation. DNA damage of cell was mainly due tothe radiation effect of Auger electrons. The 67Ga may be a therapeutic radionuclide with good prospect for tumortreatment and palliation of bone pain induced by metastasis.展开更多
Calculations of energies and absolute intensities of Auger electron and X-ray arising from electron cap- ture are introduced briefly. The calculation codes and main process are also presented. The application is also ...Calculations of energies and absolute intensities of Auger electron and X-ray arising from electron cap- ture are introduced briefly. The calculation codes and main process are also presented. The application is also given by taking 55Fe ε decay as an example.展开更多
Garnet-type oxide solid electrolytes are the critical materials for all-solid-state lithium ion batteries.Nanoscale spectroscopic analysis on solid electrolytes plays a key role in bridging the gap between microstruct...Garnet-type oxide solid electrolytes are the critical materials for all-solid-state lithium ion batteries.Nanoscale spectroscopic analysis on solid electrolytes plays a key role in bridging the gap between microstructure and properties.In this work,Auger electron spectroscopy(AES),which can directly detect lithium element and distinguish its valence state,was applied to characterize the garnet-type Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6O12)(LLZTO).Different spectroscopy parameters were evaluated and optimal acquisition conditions were provided.Electron induced precipitation of lithium metal from LLZTO was observed.By exploring the influence factors of precipitation and combining transmission electron microscopy(TEM)and focused ion beam(FIB)experiments,the underlying mechanism of the phenomenon was revealed and previous controversy was resolved.The analysis method was also extended to other types of solid electrolytes,and this work provides a reference for future in-depth research on the structure-property relationship of solid electrolytes using AES.展开更多
The chemical stoichiometry on the surface of superconducting δ-NbN thin films is of great importance for their application.Here,we fabricated the δ-NbN thin films on SiO2/Si substrate by DC sputtering method.The fil...The chemical stoichiometry on the surface of superconducting δ-NbN thin films is of great importance for their application.Here,we fabricated the δ-NbN thin films on SiO2/Si substrate by DC sputtering method.The film was characterized using X-ray diffraction(XRD) and atomic force microscopy(AFM).Transport properties were measured to reveal the field dependent superconducting transition temperature.Both XRD and electrical measurement show high crystallinity of δ-NbN phase.A homogeneous and smooth surface morphology was measured by AFM.Auger electron spectroscopy(AES) was applied to analyze the composition along the depth of the film.The evolution of Auger peak profile,heights and nitride stoichiometry at the film surface is discussed.The current study provides a more thorough understanding of complex chemical compositions of δ-NbN thin films.展开更多
The effect of rare-earth cerium on impurity P-induced embrittlement for an advanced SA508Gr.4N reactor pressure vessels steel is investigated by virtue of microstructural characterization,Auger electron spectroscopy(A...The effect of rare-earth cerium on impurity P-induced embrittlement for an advanced SA508Gr.4N reactor pressure vessels steel is investigated by virtue of microstructural characterization,Auger electron spectroscopy(AES),and spin-polarized density functional theory(DFT)calculations.The ductile-to-brittle transition temperatures(DBTTs)are evaluated by Charpy impact testing,and grain boundary segregation(GBS)of P is quantified by AES.Trace addition of Ce can effectively reduce GBS level of P,thereby substantially decreasing the embrittlement induced by P.A linear correlation between DBTT(℃)and GBS level of P(Cp,at.%)is observed for both undoped and Ce-doped samples,being expressed as DBTT=13.13C_(p)-335.70(undoped)and DBTT=12.67C_(p)-350.78(Ce-doped).In the absence of GBS of P,the incorporation of Ce appears to play a pivotal role in augmenting the intrinsic toughness.These results imply that the impact of Ce on impurity P-induced embrittlement may be attributed to a combination of increasing the intrinsic toughness and lowering GBS of P.DFT calculations indicate that there is a negligible interaction between Ce and P in the ternary alloy,and thus GBS of P and Ce is mainly site-competitive.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 emitting radionuclides have potential for the therapy of small-size cancers because of their high level of cytotoxicity, low-energy, high linear energy transfer, and short range biologic effectiveness. ...Auger electron emitting radionuclides have potential for the therapy of small-size cancers because of their high level of cytotoxicity, low-energy, high linear energy transfer, and short range biologic effectiveness. Auger emitter 165Er (T1/2 = 10.3 h, IEC = 100%) is a potent nuclide for targeted radionuclide therapy. 165Er excitation function via 165Ho(p,n)165Er, 165Ho(d,2n)165Er, 166Er(p,2n)165Tm→165Er, 166Er(d,3n)165Tm→165Er, natEr(p,xn)165Tm→165Er and 164Er(d,n)165Tm→165Er reactions were calculated by ALICE/91, ALICE/ASH (GDH Model & Hybrid Model) and TALYS-1.2 (Equilibrium & Pre-Equilibrium) codes and compared to existing data. Requisite for optimal thicknesses of targets were obtained by SRIM code for each reaction.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The comet assay (single cell gel electrophoresis assay) was used to evaluate the radiotoxicity of Augerelectron emitters in the human osteosarcoma cell line (HOS-8603). After internal exposure to 67Ga-EDTMP, the sar-coma cell has been injured severely. The comet length was longer along with the increase of dose, the appearance ofcomet tail was different from that with respect to the 60Co γ-ray irradiation. DNA damage of cell was mainly due tothe radiation effect of Auger electrons. The 67Ga may be a therapeutic radionuclide with good prospect for tumortreatment and palliation of bone pain induced by metastasis.
文摘Calculations of energies and absolute intensities of Auger electron and X-ray arising from electron cap- ture are introduced briefly. The calculation codes and main process are also presented. The application is also given by taking 55Fe ε decay as an example.
基金supported by the Shanghai Science and Technology Plan(No.21DZ2260400)the startup funding from ShanghaiTech University.The electron microscopy characterization was supported by the Center for High-resolution Electron Microscopy(CћEM)at ShanghaiTech University。
文摘Garnet-type oxide solid electrolytes are the critical materials for all-solid-state lithium ion batteries.Nanoscale spectroscopic analysis on solid electrolytes plays a key role in bridging the gap between microstructure and properties.In this work,Auger electron spectroscopy(AES),which can directly detect lithium element and distinguish its valence state,was applied to characterize the garnet-type Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6O12)(LLZTO).Different spectroscopy parameters were evaluated and optimal acquisition conditions were provided.Electron induced precipitation of lithium metal from LLZTO was observed.By exploring the influence factors of precipitation and combining transmission electron microscopy(TEM)and focused ion beam(FIB)experiments,the underlying mechanism of the phenomenon was revealed and previous controversy was resolved.The analysis method was also extended to other types of solid electrolytes,and this work provides a reference for future in-depth research on the structure-property relationship of solid electrolytes using AES.
基金supported in part by the Ministry of Science and Technology (MOST) of China (No. 2018YFE0202700)the National Natural Science Foundation of China (Grants No.12004251,12104302,12104303)+3 种基金the Natural Science Foundation of Shanghai (Grant No.20ZR1436100)the Science and Technology Commission of Shanghai Municipality,the start-up funding from ShanghaiTech UniversityBeijing National Laboratory for Condensed Matter Physicsthe Interdisciplinary Program of Wuhan National High Magnetic Field Center (WHMFC202124)。
文摘The chemical stoichiometry on the surface of superconducting δ-NbN thin films is of great importance for their application.Here,we fabricated the δ-NbN thin films on SiO2/Si substrate by DC sputtering method.The film was characterized using X-ray diffraction(XRD) and atomic force microscopy(AFM).Transport properties were measured to reveal the field dependent superconducting transition temperature.Both XRD and electrical measurement show high crystallinity of δ-NbN phase.A homogeneous and smooth surface morphology was measured by AFM.Auger electron spectroscopy(AES) was applied to analyze the composition along the depth of the film.The evolution of Auger peak profile,heights and nitride stoichiometry at the film surface is discussed.The current study provides a more thorough understanding of complex chemical compositions of δ-NbN thin films.
基金supported by the China Postdoctoral Science Foundation(No.2023M740973)the Shenzhen Polytechnic University Research Fund,China(No.6023310017K)the National Natural Science Foundation of China(Nos.52071088 and 51871064).
文摘The effect of rare-earth cerium on impurity P-induced embrittlement for an advanced SA508Gr.4N reactor pressure vessels steel is investigated by virtue of microstructural characterization,Auger electron spectroscopy(AES),and spin-polarized density functional theory(DFT)calculations.The ductile-to-brittle transition temperatures(DBTTs)are evaluated by Charpy impact testing,and grain boundary segregation(GBS)of P is quantified by AES.Trace addition of Ce can effectively reduce GBS level of P,thereby substantially decreasing the embrittlement induced by P.A linear correlation between DBTT(℃)and GBS level of P(Cp,at.%)is observed for both undoped and Ce-doped samples,being expressed as DBTT=13.13C_(p)-335.70(undoped)and DBTT=12.67C_(p)-350.78(Ce-doped).In the absence of GBS of P,the incorporation of Ce appears to play a pivotal role in augmenting the intrinsic toughness.These results imply that the impact of Ce on impurity P-induced embrittlement may be attributed to a combination of increasing the intrinsic toughness and lowering GBS of P.DFT calculations indicate that there is a negligible interaction between Ce and P in the ternary alloy,and thus GBS of P and Ce is mainly site-competitive.
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 emitting radionuclides have potential for the therapy of small-size cancers because of their high level of cytotoxicity, low-energy, high linear energy transfer, and short range biologic effectiveness. Auger emitter 165Er (T1/2 = 10.3 h, IEC = 100%) is a potent nuclide for targeted radionuclide therapy. 165Er excitation function via 165Ho(p,n)165Er, 165Ho(d,2n)165Er, 166Er(p,2n)165Tm→165Er, 166Er(d,3n)165Tm→165Er, natEr(p,xn)165Tm→165Er and 164Er(d,n)165Tm→165Er reactions were calculated by ALICE/91, ALICE/ASH (GDH Model & Hybrid Model) and TALYS-1.2 (Equilibrium & Pre-Equilibrium) codes and compared to existing data. Requisite for optimal thicknesses of targets were obtained by SRIM code for each reaction.
