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学者姓名：韩晓东
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摘要 ：
纳米Ir薄膜中缺陷结构的原子尺度研究
关键词 ：
缺陷 缺陷 多重孪晶 多重孪晶 面心立方 面心立方 位错 位错 原子尺度 原子尺度 孪晶界 孪晶界
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| GB/T 7714 | 韦如建 , 贺昕 , 王兴权 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 [J]. | 韦如建 , 2021 , 40 (2) : 101-107 . |
| MLA | 韦如建 et al. "纳米Ir薄膜中缺陷结构的原子尺度研究" . | 韦如建 40 . 2 (2021) : 101-107 . |
| APA | 韦如建 , 贺昕 , 王兴权 , 熊晓东 , 罗俊锋 , 闻明 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 . | 韦如建 , 2021 , 40 (2) , 101-107 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
金属铱(Ir)因具有高密度,高熔点,高硬度等特点而被广泛应用于航空航天、军工等高新科技领域.但Ir的塑性差,严重影响其进一步广泛应用.金属自身的结构及缺陷对其力学性能具有重要影响,研究Ir的原子尺度微观结构可为其力学性能优化提供重要参考.本文主要利用透射电子显微镜(TEM)对纳米Ir薄膜中的缺陷类型和缺陷密度进行了研究.发现薄膜中存在高密度的孪晶以及位错.其中,薄膜中的孪晶密度为1.6×103(1/μm2).此外,研究还发现薄膜中有两大类缺陷的相互作用:位错与孪晶相互作用以及孪晶与孪晶相互作用.前者包括层错与孪晶相互作用以及全位错对孪晶的钉扎作用;孪晶之间的相互作用形态包括头对头对接式,三重孪晶和五重孪晶等多种形态.
关键词 ：
位错 位错 多重孪晶 多重孪晶 原子尺度 原子尺度 面心立方 面心立方 孪晶界 孪晶界 缺陷 缺陷
引用：
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| GB/T 7714 | 韦如建 , 贺昕 , 王兴权 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 [J]. | 电子显微学报 , 2021 , 40 (2) : 101-107 . |
| MLA | 韦如建 et al. "纳米Ir薄膜中缺陷结构的原子尺度研究" . | 电子显微学报 40 . 2 (2021) : 101-107 . |
| APA | 韦如建 , 贺昕 , 王兴权 , 熊晓东 , 罗俊锋 , 闻明 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 . | 电子显微学报 , 2021 , 40 (2) , 101-107 . |
| 导入链接 | NoteExpress RIS BibTex |
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| GB/T 7714 | Wang, Li , Li, Jintao , Zhang, Na et al. Investigations of EGFR configurations on tumor cell surface by high-resolution electron microscopy (vol 532, pg 179, 2020) [J]. | BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS , 2021 , 558 : 239-239 . |
| MLA | Wang, Li et al. "Investigations of EGFR configurations on tumor cell surface by high-resolution electron microscopy (vol 532, pg 179, 2020)" . | BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS 558 (2021) : 239-239 . |
| APA | Wang, Li , Li, Jintao , Zhang, Na , Zhang, Xiaofei , Xia, Yang , Chai, Binbin et al. Investigations of EGFR configurations on tumor cell surface by high-resolution electron microscopy (vol 532, pg 179, 2020) . | BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS , 2021 , 558 , 239-239 . |
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摘要 ：
本文利用原位实验技术,在透射电镜中对AuAg纳米晶薄膜裂纹扩展以及裂纹前端塑性机制进行了原位原子尺度观察。原位观察发现,在初期,裂纹在晶界处形核并沿着晶界扩展,在裂纹前端晶粒内部有形变孪晶的形核与长大。随着应变的增加,逐渐转为穿晶断裂,此时晶粒内的生长孪晶及变形孪晶均展现出良好的塑性变形能力。本实验对人们理解面心立方合金纳米晶材料的裂纹扩展机制具有一定借鉴意义。
关键词 ：
合金 合金 孪晶 孪晶 晶间裂纹 晶间裂纹 纳米晶薄膜 纳米晶薄膜 裂纹扩展 裂纹扩展 退孪晶 退孪晶
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| GB/T 7714 | 杨成鹏 , 符立波 , 郭谊忠 et al. AuAg纳米晶薄膜裂纹扩展的原位原子尺度观察 [J]. | 电子显微学报 , 2021 , 40 (05) : 489-495 . |
| MLA | 杨成鹏 et al. "AuAg纳米晶薄膜裂纹扩展的原位原子尺度观察" . | 电子显微学报 40 . 05 (2021) : 489-495 . |
| APA | 杨成鹏 , 符立波 , 郭谊忠 , 王立华 , 张泽 , 韩晓东 . AuAg纳米晶薄膜裂纹扩展的原位原子尺度观察 . | 电子显微学报 , 2021 , 40 (05) , 489-495 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Revealing the atomistic mechanisms for the high-temperature mechanical behavior of materials is important for optimizing their properties for service at high-temperatures and their thermomechanical processing. However, due to materials microstructure's dynamic recovery and the absence of available in situ techniques, the high-temperature deformation behavior and atomistic mechanisms of materials are difficult to evaluate. Here, we report the development of a microelectromechanical systems-based thermomechanical testing apparatus that enables mechanical testing at temperatures reaching 1556 K inside a transmission electron microscope for in situ investigation with atomic-resolution. With this unique technique, we first uncovered that tungsten fractures at 973 K in a ductile manner via a strain-induced multi-step body-centered cubic (BCC)-to-face-centered cubic (FCC) transformation and dislocation activities within the strain-induced FCC phase. Both events reduce the stress concentration at the crack tip and retard crack propagation. Our research provides an approach for timely and atomic-resolved high-temperature mechanical investigation of materials at high-temperatures.
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| GB/T 7714 | Zhang Jianfei , Li Yurong , Li Xiaochen et al. Timely and atomic-resolved high-temperature mechanical investigation of ductile fracture and atomistic mechanisms of tungsten. [J]. | Nature communications , 2021 , 12 (1) : 2218 . |
| MLA | Zhang Jianfei et al. "Timely and atomic-resolved high-temperature mechanical investigation of ductile fracture and atomistic mechanisms of tungsten." . | Nature communications 12 . 1 (2021) : 2218 . |
| APA | Zhang Jianfei , Li Yurong , Li Xiaochen , Zhai Yadi , Zhang Qing , Ma Dongfeng et al. Timely and atomic-resolved high-temperature mechanical investigation of ductile fracture and atomistic mechanisms of tungsten. . | Nature communications , 2021 , 12 (1) , 2218 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Photoelectronic performance of organic-inorganic hybrid perovskites has been investigated extensively. Advancement in optoelectronic characterization and application of this group of materials in solar cells, light-emitting diodes, and lasers has been pushed forward rapidly. However, nonlinear optical properties for applications in optical logic devices have not been exploited. Moreover, long-lived excitons and charges limit the response speed of such materials and further construction of ultrafast devices. In this work, we make use of the high third-order optical nonlinearity of (CH3NH3)PbBr3 single crystals and develop a femtosecond optical switch (OS) based on strong two-photon processes through absorbing one pump and one probe photon. The fascinating band structure, with a steep edge at 2.22 eV between the transmission and strong absorption bands, endows single crystals of (CH3NH3)PbBr3 with perfect characteristics for two-photon optical switching in the near infrared. An on-off ratio of the probe pulses of about 90% and a speed faster than 400 fs have been achieved for this OS device. To the best of our knowledge, such high efficiency has not been realized for an ultrafast OS with any other materials and devices. Moreover, this is a first exploration, to our best knowledge, of the third-order optical nonlinearity of organic-inorganic hybrid halide perovskites for application in ultrafast optical logic devices with high reliability and low threshold in the near infrared. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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| GB/T 7714 | Zhang, Xinping , Wang, Meng , Ma, Lin et al. Ultrafast two-photon optical switch using single crystal hybrid halide perovskites [J]. | OPTICA , 2021 , 8 (5) : 735-742 . |
| MLA | Zhang, Xinping et al. "Ultrafast two-photon optical switch using single crystal hybrid halide perovskites" . | OPTICA 8 . 5 (2021) : 735-742 . |
| APA | Zhang, Xinping , Wang, Meng , Ma, Lin , Fu, Yulan , Guo, Jinxin , Ma, He et al. Ultrafast two-photon optical switch using single crystal hybrid halide perovskites . | OPTICA , 2021 , 8 (5) , 735-742 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
It remains a daunting task to quantify the configurational entropy of a material from atom-revolved electron microscopy images and correlate the results with the material's lattice thermal conductivity, which strides across statics, dynamics, and thermal transport of crystal lattice over orders of magnitudes in length and time. Here, a proof-of-principle study of atomic-scale visualization and quantification of configurational entropy in relation to thermal conductivity in single crystalline trigonal GeSb2Te4 (aka t-GeSb2Te4) with native atomic site disorder is reported. A concerted effort of large t-GeSb2Te4 single crystal growth, in-lab developed analysis procedure of atomic column intensity, the visualization and quantification of configurational entropy including corresponding modulation, and thermal transport measurements enable an entropic "bottom-up" perspective to the lattice thermal conductivity of t-GeSb2Te4. It is uncovered that the configurational entropy increases phonon scattering and reduces phonon mean free path as well as promotes anharmonicity, thereby giving rise to low lattice thermal conductivity and promising thermoelectric performance. The current study sheds lights on an atomic scale bottom-up configurational entropy design in diverse regimes of structural and functional materials research and applications.
关键词 ：
configurational entropy configurational entropy single crystalline GeSb2Te4 single crystalline GeSb2Te4 thermal conductivity thermal conductivity
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| GB/T 7714 | Chen, Yongjin , Zhang, Bin , Zhang, Yongsheng et al. Atomic-Scale Visualization and Quantification of Configurational Entropy in Relation to Thermal Conductivity: A Proof-of-Principle Study in t-GeSb2Te4 [J]. | ADVANCED SCIENCE , 2021 , 8 (8) . |
| MLA | Chen, Yongjin et al. "Atomic-Scale Visualization and Quantification of Configurational Entropy in Relation to Thermal Conductivity: A Proof-of-Principle Study in t-GeSb2Te4" . | ADVANCED SCIENCE 8 . 8 (2021) . |
| APA | Chen, Yongjin , Zhang, Bin , Zhang, Yongsheng , Wu, Hong , Peng, Kunling , Yang, Hengquan et al. Atomic-Scale Visualization and Quantification of Configurational Entropy in Relation to Thermal Conductivity: A Proof-of-Principle Study in t-GeSb2Te4 . | ADVANCED SCIENCE , 2021 , 8 (8) . |
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摘要 ：
Detwinning is an important plastic deformation mechanism that can significantly affect the mechanical properties of twin-structured metals. Although many detwinning mechanisms have been proposed for pure metals, it is unclear whether such a deformation model is valid for nanocrystalline alloys because of the lack of direct evidence. Here, the atomic-scale detwinning deformation process of a nanocrystalline AuAg alloy with an average grain size of similar to 15 nm was investigated in situ. The results show that there are three types of detwinning mechanisms in nanocrystalline AuAg alloys. The first type of detwinning results from grain boundary migration. The second type of detwinning occurs through combined layer-by-layer thinning and incoherent twin boundary migration. The last one occurs through incoherent twin boundary migration, which results from the collective motion of partial dislocations in an array.
关键词 ：
atomic scale atomic scale detwinning detwinning in situ in situ transmission electron microscopy transmission electron microscopy twin-structured twin-structured
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| GB/T 7714 | Fu, Libo , Yang, Chengpeng , Lu, Yan et al. In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy [J]. | SCIENCE CHINA-MATERIALS , 2021 . |
| MLA | Fu, Libo et al. "In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy" . | SCIENCE CHINA-MATERIALS (2021) . |
| APA | Fu, Libo , Yang, Chengpeng , Lu, Yan , Teng, Jiao , Kong, Deli , Guo, Yizhong et al. In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy . | SCIENCE CHINA-MATERIALS , 2021 . |
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摘要 ：
The discovery of the spin Hall effect1 enabled the efficient generation and manipulation of the spin current. More recently, the magnetic spin Hall effect2,3 was observed in non-collinear antiferromagnets, where the spin conservation is broken due to the non-collinear spin configuration. This provides a unique opportunity to control the spin current and relevant device performance with controllable magnetization. Here, we report a magnetic spin Hall effect in a collinear antiferromagnet, Mn2Au. The spin currents are generated at two spin sublattices with broken spatial symmetry, and the antiparallel antiferromagnetic moments play an important role. Therefore, we term this effect the 'antiferromagnetic spin Hall effect'. The out-of-plane spins from the antiferromagnetic spin Hall effect are favourable for the efficient switching of perpendicular magnetized devices, which is required for high-density applications. The antiferromagnetic spin Hall effect adds another twist to the atomic-level control of spin currents via the antiferromagnetic spin structure.
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| GB/T 7714 | Chen Xianzhe , Shi Shuyuan , Shi Guoyi et al. Observation of the antiferromagnetic spin Hall effect. [J]. | Nature materials , 2021 , 20 (6) : 800-804 . |
| MLA | Chen Xianzhe et al. "Observation of the antiferromagnetic spin Hall effect." . | Nature materials 20 . 6 (2021) : 800-804 . |
| APA | Chen Xianzhe , Shi Shuyuan , Shi Guoyi , Fan Xiaolong , Song Cheng , Zhou Xiaofeng et al. Observation of the antiferromagnetic spin Hall effect. . | Nature materials , 2021 , 20 (6) , 800-804 . |
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摘要 ：
Progress towards high performance X-ray detection and dynamic imaging applications, including nondestructive inspection, homeland security, and medical diagnostics, requires scintillators with a high light yield, a reasonable decay time, low cost, and eco-friendliness. Recently, copper halide scintillators have drawn tremendous attention due to their outstanding radioluminescence performance. Here, we first employed beta-Cs3Cu2Cl5 as a high-performance scintillator, with a photoluminescence quantum yield (PLQY) of 94.6%, a radioluminescence light yield of 34 000 +/- 4000 photons per MeV, a low detection limit of 81.7 nGy(air) s(-1), and good operational stability under a total X-ray dose of 174.6 Gy(air) in air. In addition, this scintillator presents a high spatial resolution of 9.6 lp mm(-1) at the modulation transfer function of 0.2 and a superb performance at 60 frames per second in our X-ray imaging system. Overall, this highly efficient scintillator demonstrates outstanding comprehensive performance and shows great potential for broad applications in X-ray detection and dynamic imaging.
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| GB/T 7714 | Zhou, Quan , Ren, Jiwei , Xiao, Jiawen et al. Highly efficient copper halide scintillators for high-performance and dynamic X-ray imaging [J]. | NANOSCALE , 2021 . |
| MLA | Zhou, Quan et al. "Highly efficient copper halide scintillators for high-performance and dynamic X-ray imaging" . | NANOSCALE (2021) . |
| APA | Zhou, Quan , Ren, Jiwei , Xiao, Jiawen , Lei, Lin , Liao, Feiyi , Di, Haipeng et al. Highly efficient copper halide scintillators for high-performance and dynamic X-ray imaging . | NANOSCALE , 2021 . |
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