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Three-dimensional size and orientation of the precipitates in AZ91 magnesium alloys measured by TEM techniques

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Chinese Physics B 2009年第10期18卷 4370-4379页

作者：郑鸥马家艳王建波周嘉萍金磊赵东山王仁卉 Department of Physics and Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education Wuhan University Centre for electron Microscopy Wuhan University

Knowledge of the microscopic structure, including three-dimensional （3-D） size and orientation of the precipitates, is essential to fully understand the mechanical properties of the magnesium alloys and designing the alloys with better performance. Analytical TEM with high spatial resolution offers the simultaneous measurements of 3-D size, structure, orientation, composition of the precipitates from one typical sample along an established crystallographic axis. Besides popular Burgers orientation relationship （OR）, other ORs such as Pitsch-Schrader OR, Crawley OR, Potter OR and a new OR with the form of [0001]α 1.0° from [311]γ and （1120）α 2.0° from （033）γ between the magnesium matrix and the precipitate γ-MglTAl 12 are identified by TEM imaging and diffraction techniques. As a case study, the thicknesses of the individual precipitates with Burgers OR are further measured to be 100 200 nm through both electron energy-loss spectroscopy and x-ray energy dispersive spectroscopy combining differential x-ray absorption and extrapolation, which are in agreement with the overall 3-D size statistic distribution results obtained through analysing various samples along various directions. Furthermore, the fabricated wedge-shape structure provides a platform on which to study the dependence of the interfacial strain on the variation of the thickness.

关键词： transmission electron microscopy microstructure Mg electron energy loss spectroscopy

Synthesis of yttrium iron garnet/bismuth quantum dot heterostructures with localized plasmon enhanced magneto-optical performance

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Journal of Materials Science & Technology 2020年第16期47卷 32-39页

作者： Lichuan Jin Caiyun Hong Dainan Zhang Peng Gao Yiheng Rao Gang Wang Qinghui Yang Zhiyong Zhong Huaiwu Zhang State Key Laboratory of electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China School of Science Westlake UniversityHangzhou310024China electron Microscopy Laboratory and International Center for Quantum MaterialsSchool of PhysicsPeking UniversityBeijing100871China Collaborative Innovation Centre of Quantum Matter Beijing100871China

Interactions between light and magnetic matter attracted great attention lately due to their potential applications in nanophotonics,spintronics,and high-accuracy ***,we grew bismuth quantum dots(Bi–QDs)with strong spin–orbit coupling on a magnetic insulator yttrium iron garnet(YIG)via molecular beam *** YIG/Bi–QDs material shows an enhanced magneto-optical Kerr rotation up to 130%compared with that of a bare YIG *** Bi–QDs were also introduced onto a lutetium–bismuth co-doped YIG film to form a hybrid system with remarkably enhanced Kerr rotation(from 1626 to 2341 mdeg).Ferromagnetic resonance measurements showed an increased effective magnetization as well as interfacial spin–orbit field in the YIG/Bi–QD *** plasmons were mapped using electron energy loss spectroscopy with high spatial resolution,revealing enhanced plasmon intensity at both the Bi–QD surface and YIG/Bi–QD *** Bi-QDs onto the YIG film enhanced Kerr rotation owing to the attenuated optical reflection and increased effective *** Bi–QDenhanced magneto-optical effect enables development of efficient nanoscale light switching,spintronics,and even plasmonic nano-antennas.

关键词： electron energy loss spectroscopy Surface plasmon resonance Magneto-optical materials Bismuth quantum dot Ferromagnetic resonance

Average kinetic energy of ions ejected from pure Coulomb explosions of methane clusters

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Chinese Optics Letters 2008年第6期6卷 391-394页

作者：陈光龙王成卢海洋刘建胜李儒新倪国权徐至展 State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

We use an electrostatic model to study the average kinetic energy of ions ejected from the pure Coulomb explosions of methane clusters （CA4）n （light atom A=H and D）. It is found that the ratio of the average kinetic energy of the ions to their initial average electrostatic potential energy is irrelevant to the cluster size. This finding implies that as long as the ratio is given, the average kinetic energies of the ions can be simply estimated from their initial average electrostatic potential energies, rather than from the timeconsuming simulations. The ratios for the different charge states of carbon ions are presented.

关键词： Chlorine compounds electron energy loss spectroscopy Kinetic energy Methane

Proton Inelastic Mean Free Path in a Group of Organic Materials in 0.05-10MeV Range

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Chinese Physics Letters 2010年第11期27卷 69-72页

作者：谭震宇夏曰源赵明文刘向东 School of Electrical Engineering Shandong University dinah 250061 School of Physics Shandong University dinah 250100

Inelastic mean free paths （MFPs） of 0.05-10 MeV protons in a group of 10 organic compounds are systematically calculated. The calculations are based on the method newly derived from the Ashley optical-data model and from the higher-order correction terms in stopping power calculations. Especially, in this method the new and empirical Bloch correction for the inelastic MFP is given. An evaluation for the optical energy loss function is incorporated into the present calculations because of the lack of available experimental optical data for the considered organic compounds expect for kapton. The proton inelastic MFPs for these 10 organic compounds in the energy range from 0.05 to 10 MeV are presented here for the first time, and the combination of these inelastic MFP data and our previous data of stopping power calculation for these bioorganic compounds may form a useful database for Monte Carlo track-structure studies of various radiation effects on these materials.

关键词： INELASTIC scattering ORGANIC compounds PROTONS MEAN free path (Physics) electron energy loss spectroscopy RADIATION

Simulation Study of electron Beam Induced Surface Plasmon Excitation at Nanoparticles

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Chinese Journal of Chemical Physics 2018年第5期31卷 655-660,735页

作者： Zhe Zheng Bo Da Ke-jun Zhang Ze-jun Ding CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics Hefei National Laboratory for Physical Sciences at the Microscale and Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Geospace Environment Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China Center for Materials research by Information Integration(CMI2) Research and Services Division of Materials Data and Integrated System(MaDIS)National Institute for Materials Science1-2-1 SengenTsukubaIbaraki 305-0047Japan

Phenomenon of localized surface plasmon excitation at nanostructured materials has attracted much attention in recent decades for their wide applications in single molecule detection,surface-enhanced Raman spectroscopy and *** addition to the excitation by external light field,an electron beam can also induce the local surface plasmon ***,electron energy loss spectroscopy(EELS)technique has been increasingly employed in experiment to investigate the surface excitation characteristics of metallic ***,a present theoretical analysis tool for electromagnetic analysis based on the discrete dipole approximation(DDA)method can only treat the case of excitation by light *** this work we extend the DDA method for the calculation of EELS spectrum for arbitary nanostructured *** have simulated EELS spectra for different incident locations of an electron beam on a single silver nanoparticle,the simulated results agree with an experimental measurement very *** present method then provides a computation tool for study of the local surface plasmon excitation of metallic nanoparticles induced by an electron beam.

关键词： Surface plasmon excitation Nanostructured materials Nanoparticles electron energy loss spectroscopy

Beryllium-distribution in metallic glass matrix composite containing beryllium

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Transactions of Nonferrous Metals Society of China 2017年第1期27卷 110-116页

作者：郭振玺王永胜朱陆军张跃飞张振华柯小行林均品郝国建张泽隋曼龄北京工业大学固体微结构与性能研究所北京100124 中国科学院生物物理研究所蛋白质科学研究平台生物成像中心北京100101 太原理工大学材料科学与工程学院太原030024 北京科技大学新材料国家重点实验室北京100083 浙江大学材料科学与工程学系硅材料国家重点实验室杭州310027

The morphologies, sizes, compositions and volume fractions of dendritic phases in in situ Ti-based metallic glass matrix composites （MGMCs） containing beryllium （Be） with the nominal composition of Tia7Zr19Cu5V12Be17 （mole fraction, %） were investigated using XRD, SEM, EBSD, TEM, EDS and three-dimensional reconstruction method. Moreover, visualized at the nanoscale, Be distribution is confirmed to be only present in the matrix using scanning transmission electron microscopy-electron energy loss spectroscopy （STEM-EELS）. Based on these findings, it has been obtained that the accurate chemical compositions are Wi28.3Zr19.7Cu8V6.4Be37.6 （mole fraction, %） for glass matrix and ***2.6V16.6 （mole fraction, %） for the dendritic phases, and the volume fractions are 38.5% and 61.5%, respectively. It is believed that the results are of particular importance for the designing of Be-containing MGMCs.

关键词： metallic glass composites microstructure electron energy loss spectroscopy Be-distribution

Vibrational spectroscopy on metal oxide surfaces

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Vibrational spectroscopy on metal oxide surfaces