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学者姓名：韩晓东
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摘要 ：
A simple morphogenetic route has been developed to obtain free-standing lithium titanium phosphate (LiTi2(PO4)(3), LTP) with physical morphology resemble to a fabric. Commercial cotton textiles are used as templates by loading with aqueous solutions of corresponding precursors and then the cellulosic component is burned off in a furnace held at 600 degrees C. A well-crystallized centimeter-sized lithium titanium phosphate piece can then be synthesized with morphology similar to the fabric and high porosity. After uniformly coating the as-obtained lithium titanium phosphate network with amorphous carbon, the sample shows superior rate capability and cyclability in rechargeable lithium ion batteries. This method can be extendable for other templates and other titanium based electrode materials. (C) 2022 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
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| GB/T 7714 | Zhou, Xiao-Liang , Yan, Zheng-Guang , Ma, Lin et al. Carbon-Coated Porous LiTi2(PO4)(3) Network with Excellent Electrochemical Property via Replication of Cotton Fabric [J]. | JOURNAL OF THE ELECTROCHEMICAL SOCIETY , 2022 , 169 (8) . |
| MLA | Zhou, Xiao-Liang et al. "Carbon-Coated Porous LiTi2(PO4)(3) Network with Excellent Electrochemical Property via Replication of Cotton Fabric" . | JOURNAL OF THE ELECTROCHEMICAL SOCIETY 169 . 8 (2022) . |
| APA | Zhou, Xiao-Liang , Yan, Zheng-Guang , Ma, Lin , Xiao, Wei-Qiang , Han, Xiao-Dong . Carbon-Coated Porous LiTi2(PO4)(3) Network with Excellent Electrochemical Property via Replication of Cotton Fabric . | JOURNAL OF THE ELECTROCHEMICAL SOCIETY , 2022 , 169 (8) . |
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摘要 ：
Metals usually have three crystal structures: face-centered cubic (fcc), body-centered cubic (bcc), and hexagonal-close packed (hcp) structures. Typically, metals exhibit only one of these structures at room temperature. Mechanical processing can cause phase transition in metals, however, metals that exhibit all the three crystal structures have rarely been approached, even when hydrostatic pressure or shock conditions are applied. Here, through in situ observation of the atomic-scale bending and tensile process of similar to 5 nm-sized Ag nanowires (NWs), we show that bending is an effective method to facilitate fcc-structured Ag to access all the above-mentioned structures. The process of transitioning the fcc structure into a bcc structure, then into an hcp structure, and finally into a re-oriented fcc structure under bending has been witnessed in its entirety. This re-oriented fcc structure is twin-related to the matrix, which leads to twin nucleation without the need for partial dislocation activities. The results of this study advance our understanding of the deformation mechanism of small-sized fcc metals.
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| GB/T 7714 | Sun, Shiduo , Li, Dongwei , Yang, Chenpeng et al. Direct Atomic-Scale Observation of Ultrasmall Ag Nanowires that Exhibit fcc, bcc, and hcp Structures under Bending [J]. | PHYSICAL REVIEW LETTERS , 2022 , 128 (1) . |
| MLA | Sun, Shiduo et al. "Direct Atomic-Scale Observation of Ultrasmall Ag Nanowires that Exhibit fcc, bcc, and hcp Structures under Bending" . | PHYSICAL REVIEW LETTERS 128 . 1 (2022) . |
| APA | Sun, Shiduo , Li, Dongwei , Yang, Chenpeng , Fu, Libo , Kong, Deli , Lu, Yan et al. Direct Atomic-Scale Observation of Ultrasmall Ag Nanowires that Exhibit fcc, bcc, and hcp Structures under Bending . | PHYSICAL REVIEW LETTERS , 2022 , 128 (1) . |
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摘要 ：
Low-dimensional hybrid halide perovskite materials with self-trapped exciton (STE) emissions and anisotropic properties are highly attractive for their great potential in many applications. However, to date, reports on large one-dimensional (1D) perovskite single crystals have been limited. Here, centimeter-sized 1D single crystals of trimethylammonium lead iodide (TMAPbI(3)) with typical STE emission are synthesized by an antisolvent vapor-assisted crystallization method. Thermal quenching and antiquenching with a high relative sensitivity of photoluminescence (PL) are observed and studied via temperature-dependent photoluminescence spectroscopy. Further analysis indicates that the temperature-dependent PL behaviors are influenced by the self-trapping of the free exciton and the migrations between self-trapped excitons and intermediate nonradiative states. The TNIAPbI(3) single crystal also exhibits a linearly polarized emission and a large birefringence that is higher than those of commercial birefringent crystals. This 1D perovskite with high structural anisotropy has promise for applications in versatile optical- and luminescence-related fields.
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| GB/T 7714 | Du, Yiping , Yan, Zhengguang , Xiao, Jiawen et al. Temperature-Dependent Luminescence and Anisotropic Optical Properties of Centimeter-Sized One-Dimensional Perovskite Trimethylammonium Lead Iodide Single Crystals [J]. | JOURNAL OF PHYSICAL CHEMISTRY LETTERS , 2022 , 13 (24) : 5451-5460 . |
| MLA | Du, Yiping et al. "Temperature-Dependent Luminescence and Anisotropic Optical Properties of Centimeter-Sized One-Dimensional Perovskite Trimethylammonium Lead Iodide Single Crystals" . | JOURNAL OF PHYSICAL CHEMISTRY LETTERS 13 . 24 (2022) : 5451-5460 . |
| APA | Du, Yiping , Yan, Zhengguang , Xiao, Jiawen , Zhang, Guoqing , Ma, Yang , Li, Songyu et al. Temperature-Dependent Luminescence and Anisotropic Optical Properties of Centimeter-Sized One-Dimensional Perovskite Trimethylammonium Lead Iodide Single Crystals . | JOURNAL OF PHYSICAL CHEMISTRY LETTERS , 2022 , 13 (24) , 5451-5460 . |
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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 . |
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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
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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 . |
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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 . |
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摘要 ：
Organic-inorganic halide perovskites (OIHPs) have the typical composition of APbX(3), in which A is a cation such as methlyamine (MA) and formamidine (FA) and X is a halide anion such as Cl, Br, or I. The mixture at the A or X site in OIHPs provides greatly improved versatility in their compositions and therefore allows the enhancement of their performance in LEDs and solar cells. In real application circumstances and deformable devices, the mechanical properties of OIHPs are of great importance. In this work, the mechanical properties of three series of mixed OIHP single crystals, MAPbI(x)Br(3-x), MAPbBr(x)Cl(3-x), and FA(y)MA(1-y)PbBr(3), are studied by nanoindentation. The results are summarized according to the composition of these mixtures. With the increase in the FA content at the A site, the average Young's modulus (E) of FA(y)MA(1-y)PbBr(3) decreases greatly from 19.2 GPa to 11.5 GPa, which indicates that the influence of organic cations on the mechanical properties of OIHPs is as important as that of Pb-X bonds. The mixture at the A or X site could also increase the hardness (H) and the wear resistance (H/E ratio). The average values of hardness and wear resistance of MAPbI(0.1)Br(2.9) are almost double (0.63 GPa, 0.033) the values for undoped MAPbBr(3) (0.32 GPa, 0.017). The dynamic mechanical responses of the OIHP single crystals show reduced creep stress exponents and thus increased strain rate sensitivities in the mixture at the X site, thereby improving the ductility. The nanoindentation sites are characterized using a scanning electron microscope and slip bands are observed, suggesting the plastic deformation mechanism governed by the activation of dislocations.
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| GB/T 7714 | Ma, Lin , Li, Wanpeng , Yang, Kaixiang et al. A- or X-site mixture on mechanical properties of APbX(3) perovskite single crystals [J]. | APL MATERIALS , 2021 , 9 (4) . |
| MLA | Ma, Lin et al. "A- or X-site mixture on mechanical properties of APbX(3) perovskite single crystals" . | APL MATERIALS 9 . 4 (2021) . |
| APA | Ma, Lin , Li, Wanpeng , Yang, Kaixiang , Bi, Jianjun , Feng, Jicun , Zhang, Jiabei et al. A- or X-site mixture on mechanical properties of APbX(3) perovskite single crystals . | APL MATERIALS , 2021 , 9 (4) . |
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摘要 ：
This study explored a multi-mechanism approach to improving the mechanical properties of a CoCrFeMnNi high-entropy alloy through non-equiatomic alloy design and processing. The alloy design ensures a single-phase face-centered cubic structure while lowering the stacking fault energy to encourage the formation of deformation twins and stacking faults by altering the equiatomic composition of the alloy. The processing strategy applied helped create a hierarchical grain size gradient microstructure with a high nanotwins population. This was achieved by means of rotationally accelerated shot peening (RASP). The non-equiatomic CoCrFeMnNi high-entropy alloy achieved a yield strength of 750 MPa, a tensile strength of 1050 MPa, and tensile uniform elongation of 27.5%. The toughness of the alloy was 2.53 x 10(10) kJ/m(3), which is about 2 times that of the same alloy without the RASP treatment. The strength increase is attributed to the effects of grain boundary strengthening, dislocation strengthening, twin strengthening, and hetero-deformation strengthening associated with the heterogeneous microstructure of the alloy. The concurrent occurrence of the multiple deformation mechanisms, i.e., dislocation deformation, twining deformation and microband deformation, contributes to achieving a suitable strain hardening of the alloy that helps to prevent early necking and to assure steady plastic deformation for high toughness. (C) 2021 Published by Elsevier Ltd on behalf of Chinese Society for Metals.
关键词 ：
Deformation mechanism Deformation mechanism Gradient and hierarchical structure Gradient and hierarchical structure High entropy alloy High entropy alloy Mechanical property Mechanical property
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| GB/T 7714 | An, Zibing , Mao, Shengcheng , Liu, Yinong et al. Hierarchical grain size and nanotwin gradient microstructure for improved mechanical properties of a non-equiatomic CoCrFeMnNi high-entropy alloy [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 92 : 195-207 . |
| MLA | An, Zibing et al. "Hierarchical grain size and nanotwin gradient microstructure for improved mechanical properties of a non-equiatomic CoCrFeMnNi high-entropy alloy" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 92 (2021) : 195-207 . |
| APA | An, Zibing , Mao, Shengcheng , Liu, Yinong , Zhou, Hao , Zhai, Yadi , Tian, Zhiyong et al. Hierarchical grain size and nanotwin gradient microstructure for improved mechanical properties of a non-equiatomic CoCrFeMnNi high-entropy alloy . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 92 , 195-207 . |
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摘要 ：
The high-temperature oxidation behaviours of AlxHfMoNbTi-series refractory high-entropy alloys with an Al content ranging from 0 to 20 at.% (x=0-1) were tested at 700-1000 degrees C. An in situ oxidation experiment was performed at 25-900 degrees C using environmental transmission electron microscopy (ETEM) to reveal the oxidation mechanism. The addition of Al to the HfMoNbTi alloy effectively increased the alloy strength and hardness. The improvement in oxidation resistance by Al addition is attributed to the formation of mixed oxide structures instead of layered oxides. Mo-rich precipitates are preferentially oxidized, and their volatilization at the metal/ oxide interface accelerates alloy oxidation.
关键词 ：
Al addition Al addition In situ In situ Oxidation Oxidation Refractory high-entropy alloy Refractory high-entropy alloy Environmental TEM Environmental TEM
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| GB/T 7714 | Yang, Xiaomeng , An, Zibing , Zhai, Yadi et al. Effect of Al content on the thermal oxidation behaviour of AlHfMoNbTi high-entropy alloys analysed by in situ environmental TEM [J]. | CORROSION SCIENCE , 2021 , 191 . |
| MLA | Yang, Xiaomeng et al. "Effect of Al content on the thermal oxidation behaviour of AlHfMoNbTi high-entropy alloys analysed by in situ environmental TEM" . | CORROSION SCIENCE 191 (2021) . |
| APA | Yang, Xiaomeng , An, Zibing , Zhai, Yadi , Wang, Xin , Chen, Yanhui , Mao, Shengcheng et al. Effect of Al content on the thermal oxidation behaviour of AlHfMoNbTi high-entropy alloys analysed by in situ environmental TEM . | CORROSION SCIENCE , 2021 , 191 . |
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