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Microstructure and Mechanical Properties of AISI 304L Austenitic Stainless Steel Processed by Various Schedules of Rolling

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Journal of Physics: Conference Series 2020年第1期1688卷

作者： A G Raab G I Raab A A Tokar O V Rybalchenko A N Belyakov S V Dobatkin P La Institute of Physics of Advanced Materials Ufa State Aviation Technical University K. Marx st. 12 450008 Ufa Russia A A Baikov Institute of Metallurgy and Materials Science of RAS Leninsky pr. 49 119334 Moscow Russia National University of Science and Technology 'MISIS' Leninskiy pr. 4 119049 Moscow Russia Belgorod State University Pobeda st. 85 308015 Belgorod Russia State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou China

The paper studies various rolling schedules implemented at 500°C (incl. direct, reverse, and cross rolling) and their effect on the structure formation and mechanical properties in AISI 304L stainless steel samples. Both TEM and SEM research techniques were applied. An ultrafine grain-subgrain microstructure was found to be formed inside elongated original grains. Rolling-processed microstructural elements were close in their size with the minimum value observed after a reverse rolling (240 nm). Mechanical properties were studied using microhardness measurements and tensile testing revealing a considerable increase in strength accompanied by a density reduction upon deformation. The strength values in the material subjected to all three rolling schedules are relatively close to the highest yield strength and ultimate tensile stress observed after reverse rolling with a strain degree of 70%.

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Corrigendum to “Fabrication of PbBi 4 Ti 4 O 15 microplatelets with different TiO 2 reactants) composites with high permittivity and low loss” [Mater. Lett. 274 (2020) 128018]

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materials Letters 2022年 310卷

作者： Leilei Li Junting Liu Shuyao Cao Jie Xu Emilia Pawlikowska Mikołaj Szafran Feng Gao State Key Laboratory of Solidification Processing MIIT Key Laboratory of Radiation Detection Materials and Devices NPU-QMUL Joint Research Institute of Advanced Materials and Structures (JRI-AMAS) School of Materials Science and Engineering Northwestern Polytechnical University Xi’an Shaanxi 710072 PR China Institute of High Pressure Physics of the Polish Academy of Sciences ul. Sokolowska 29/37 01-142 Warsaw Poland Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland

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Electron-Phonon Coupling Suppression by Enhanced Lattice Rigidity in 2D Perovskite Single Crystals for High-Performance X-Ray Detection

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advanced materials (Deerfield Beach, Fla.) 2023年第7期35卷 e2208875页

作者： Bobo Zhang Tao Zheng Jiaxue You Chuang Ma Yucheng Liu Lu Zhang Jun Xi Guohua Dong Ming Liu Shengzhong Frank Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology International Joint Research Center of Shaanxi Province for Photoelectric Materials Science Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China. State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique School of Electronic Science and Engineering Xi'an Jiaotong University No. 28 Xianning West Road Xi'an 710049 China. The Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric Research School of Electronic Science and Engineering State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China. Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China. University of the Chinese Academy of Sciences Beijing 100039 China.

2D Dion-Jacobson (DJ) perovskite single crystals (PSCs) usually demonstrate better X-ray detection performance than Ruddlesden-Popper (RP) PSCs. However, the mechanism of the improved performance is still elusive. Here, by the aid of strong interactions between dimethylbiguanide (DGA) and PbI , a novel DJ-perovskitoid (DGA)PbI is designed. From the comparison of (DGA)PbI to other 2D PSCs, it is discovered that the tiniest lattice distortion and increased hydrogen bonds in the atom-scaled analysis strengthen lattice rigidity and weaken electron-phonon coupling to suppress disordered scattering of carriers, resulting in significantly improved carrier transport and stability. Therefore, high carrier mobility (78.1 cm V s ) and a pronounced sensitivity of 4869.0 µC Gy cm are achieved using (DGA)PbI , which are the best in 2D Pb-based PSC devices to date. Finally, the (DGA)PbI devices exhibit good spatial resolution in X-ray imaging and excellent long-term stability to work as a promising candidate for medical diagnostics and nondestructive determination.

关键词： 2D perovskite X-ray detection electron-phonon coupling high sensitivity lattice rigidity

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Possible structural origin of superconductivity in Sr-doped Bi2Se3

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Physical Review materials 2018年第1期2卷 014201-014201页

作者： Zhuojun Li Meng Wang Dejiong Zhang Nan Feng Wenxiang Jiang Chaoqun Han Weijiong Chen Mao Ye Chunlei Gao Jinfeng Jia Jixue Li Shan Qiao Dong Qian Ben Xu He Tian Bo Gao CAS Center for Excellence in Superconducting Electronics (CENSE) Shanghai 200050 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China University of Chinese Academy of Sciences Beijing 100049 China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 People's Republic of China Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Doping bismuth selenide (Bi2Se3) with elements such as copper and strontium (Sr) can induce superconductivity, making the doped materials interesting candidates to explore potential topological superconducting behaviors. It was thought that the superconductivity of doped Bi2Se3 was induced by dopant atoms intercalated in van der Waals gaps. However, several experiments have shown that the intercalation of dopant atoms may not necessarily make doped Bi2Se3 superconducting. Thus, the structural origin of superconductivity in doped Bi2Se3 remains an open question. Herein, we combined material synthesis and characterization, high-resolution transmission electron microscopy, and first-principles calculations to study the doping structure of Sr-doped Bi2Se3. We found that the emergence of superconductivity is strongly related with n-type dopant atoms. Atomic-level energy-dispersive x-ray mapping revealed various n-type Sr dopants that occupy intercalated and interstitial positions. First-principles calculations showed that the formation energy of a specific interstitial Sr doping position depends strongly on the Sr doping level. This site changes from a metastable position at low Sr doping level to a stable position at high Sr doping level. The calculation results explain why quenching is necessary to obtain superconducting samples when the Sr doping level is low and also why slow furnace cooling can yield superconducting samples when the Sr doping level is high. Our findings suggest that Sr atoms doped at interstitial locations, instead of those intercalated in van der Waals gaps, are most likely to be responsible for the emergence of superconductivity in Sr-doped Bi2Se3.

关键词： Dopants Impurities in superconductors

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Solution-Grown Chloride Perovskite Crystal of Red Afterglow

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Angewandte Chemie 2021年第46期133卷

作者： Wei Zheng Xiuling Li Nianqiao Liu Shao Yan Xiaojia Wang Xiangzhou Zhang Yeqi Liu Yanjie Liang Yuhai Zhang Hong Liu Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong Institute for Advanced Interdisciplinary Research (iAIR) University of Jinan Jinan 250022 Shandong China School of Physics and Technology University of Jinan Jinan 250022 Shandong China Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 P. R. China State Key Laboratory of Crystal Materials Shandong University 27 Shandanan Road Jinan Shandong 250100 China

We report the growth of a halide-based double perovskite, Cs 2 Na x Ag 1− x InCl 6 : y %Mn, via a facile hydrothermal reaction at 180 °C. Through a co-doping strategy of both Na + and Mn 2+ , the as-prepared crystals exhibited a red afterglow featuring a high color purity (ca. 100 %) and a long duration time (>5400 s), three orders of magnitude longer than those solution-processed organic afterglow crystals. The energy transfer (ET) process between self-trapped excitons (STE) and activators was investigated through time-resolved spectroscopy, which suggested an ET efficiency up to 41 %. Importantly, the nominal concentration of dopants, especially in the case of Na + , was found a useful tool to control both energy level and number distribution of traps. Cryogenic afterglow measurements suggested that the afterglow phenomenon was likely governed by thermal-activated exciton diffusion and electron tunneling process.

关键词： doped chloride perovskite double perovskites hydrothermal synthesis red afterglow crystals self-trapped excitons

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Design of Ligand-Nonbridging Sites in Metal–Organic Frameworks for Boosting Lithium Storage Capacity

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Angewandte Chemie 2024年第6期137卷

作者： Lanju Sun Chongzhi Zhu Lukun Li Rumeng Zheng Jian Yuan Zhiliang Li Jikai Sun Guan Sheng Hao Wu Qingdao Engineering Research Center of Agricultural Recycling Economy Materials College of Chemistry and Pharmaceutical Sciences Qingdao Agricultural University 266109 Qingdao China Institute of Frontier Chemistry School of Chemistry and Chemical Engineering Shandong University 266237 Qingdao China Center for Electron Microscopy Institute for Frontier and Interdisciplinary Sciences State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology College of Materials Science and Engineering and College of Chemical Engineering Zhejiang University of Technology 310014 Hangzhou China School of Materials Science and Engineering State Key Laboratory of Heavy Oil Processing China University of Petroleum (East China) 266580 Qingdao China

Metal–organic frameworks (MOFs) are lagging in the use of lithium-ion batteries (LIBs), ascribing to full coordination between metal nodes and organic ligands, to a large extent. By integrating a modulator into a ligand with missing bridging functionality, this study elucidates the role of non-bridging defect sites in MOFs in tailoring lithium storage performance. A fully bridged pristine MOF (p-MOF) utilizing the meso-tetra(4-carboxylphenyl) porphyrin ligand is compared with a modified MOF containing non-bridging defects (d-MOF) introduced by a homologous ligand, tris(4-carboxyphenyl) porphyrin. Spectroscopic and cryogenic low-dose electron microscopy techniques verify the presence of non-bridging defect sites in the d-MOF and reveal their explicit local structure. Density functional theory calculations show significantly enhanced Li + adsorption energies and reduced Li + migration barriers at the non-bridging sites in the d-MOF compared to the fully bridging sites in the p-MOF. As a result, the d-MOF exhibits exceptional lithium storage performance, achieving a high capacity of 761 mAh g −1 at 0.05 A g −1 and superior rate performance of 203 mAh g −1 at 5 A g −1 , which substantially outperform the p-MOF. This study highlights the potential of modulating MOFs with non-bridging defects to develop high-performance LIBs.

关键词： Lithium storage Ligand engineering Defects Metal–organic frameworks Adsorption energy

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Boosting Electrocatalytic Activity of 3d-Block Metal (Hydro)oxides by Ligand-Induced Conversion

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Angewandte Chemie 2021年第19期133卷

作者： Dr. Wenxian Liu Dong Zheng Dr. Tianqi Deng Dr. Qiaoli Chen Chongzhi Zhu Chengjie Pei Dr. Hai Li Dr. Fangfang Wu Dr. Wenhui Shi Dr. Shuo-Wang Yang Prof. Yihan Zhu Prof. Xiehong Cao College of Materials Science and Engineering State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology Center for Electron Microscopy Center for Membrane Separation and Water Science & Technology College of Chemical Engineering Zhejiang University of Technology 18 Chaowang Road Hangzhou Zhejiang 310014 P. R. China Institute of High Performance Computing Agency for Science Technology and Research 1 Fusionopolis Way #16-16 Connexis Singapore 138632 Singapore Key Laboratory of Flexible Electronics and Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University 30 South Puzhu Road Nanjing Jiangsu 211816 P. R. China

The 3d-transition-metal (hydro)oxides belong to a group of highly efficient, scalable and inexpensive electrocatalysts for widespread energy-related applications that feature easily tailorable crystal and electronic structures. We propose a general strategy to further boost their electrocatalytic activities by introducing organic ligands into the framework, considering that most 3d-metal (hydro)oxides usually exhibit quite strong binding with reaction intermediates and thus compromised activity due to the scaling relations. Involving weakly bonded ligands downshifts the d-band center, which narrows the band gap, and optimizes the adsorption of these intermediates. For example, the activity of the oxygen evolution reaction (OER) can be greatly promoted by ≈5.7 times over a NiCo layered double hydroxide (LDH) after a terephthalic acid (TPA)-induced conversion process, arising from the reduced energy barrier of the deprotonation of OH* to O*. Impressively, the proposed ligand-induced conversion strategy is applicable to a series of 3d-block metal (hydro)oxides, including NiFe 2 O 4 , NiCo 2 O 4 , and NiZn LDH, providing a general structural upgrading scheme for existing high-performance electrocatalytic systems.

关键词： electronic-structure engineering flexible Zn–air batteries layered double hydroxides metal–organic frameworks oxygen evolution reaction

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Corrigendum to ‘Characterization and formation mechanism of ultra-fine ferrite grains in dissimilar metal weld between austenitic stainless steel and low alloy ferritic steel’ [Mater. Charact. https://***/10.1016/***.2020.110777]

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materials Characterization 2021年 174卷

作者： Xiaogang Li Zhipeng Cai Xin Chen Shuqing Dong Wenhe Cai Xiaoming Shi Chaoyu Han Yu Zhang Kejian Li Jiluan Pan Department of Mechanical Engineering Tsinghua University Beijing 100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing 100084 China State Key Laboratory of Tribology Tsinghua University Beijing 100084 China Collaborative Innovation Center of Advanced Nuclear Energy Technology Tsinghua University Beijing 100084 China China Datang Corporation Science and Technological Research Institute Thermal Power Technology Research Institute Beijing 100040 China Jiangsu Nantong Power Generation Co. Ltd. Nantong 226000 China

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A Highly Active Molybdenum Carbide Catalyst with Dynamic Carbon Flux for Reverse Water-Gas Shift Reaction

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Angewandte Chemie 2024年第6期137卷

作者： Mengtao Zhang Yuchen Zhu Jie Yan Junzhong Xie Tao Yu Mi Peng Jiayun Zhao Yao Xu Aowen Li ChunJiang Jia Lin He Meng Wang Wu Zhou Rongming Wang Hong Jiang Chuan Shi Jose Rodriguez Ding Ma Beijing National Laboratory for Molecular Sciences New Cornerstone Laboratory College of Chemistry and Molecular Engineering Peking University Beijing 100871 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China State Key Laboratory of Fine Chemicals College of Chemical Engineering Dalian University of Technology Dalian 116024 China School of Physical Sciences and CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory for Colloid and Interface Chemistry Key Laboratory of Special Aggregated Materials School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics (LICP) Chinese Academy of Sciences Lanzhou 730000 China Chemistry Division Building 555 Brookhaven National Laboratory Post Office Box 5000 Upton NY 11973-5000 USA

Molybdenum carbide has been reported as an efficient and stable catalyst for reverse water-gas shift (RWGS) reaction. The conventional understanding of the mechanism suggests domination of the surface phenomena, with only surface or subsurface layers partaking in the catalytic cycle. In this study, we presented a highly active MoC catalyst from carburization process, which showed a mass-specific reaction rate over 260 μm with dynamic carbon flux in the bulk phase of the catalyst. Through Isotopic Temperature-Programmed Reaction (ITPR) analysis and Environmental Transmission Electron Microscopy (ETEM), we discerned dynamic carbon flow circulating between the α-MoC bulk phase and the gas phase reactants under the RWGS reaction atmosphere. This circulation, essential to maintaining the structural stability of the metastable α-MoC and its ultra-high reactivity, is accompanied by thorough carbon component exchange among the bulk, the surface and the gas-phase reactants during the reaction process.

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New Opportunities and Challenges of Smart Polymers in Post-Translational Modification Proteomics

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advanced materials (Deerfield Beach, Fla.) 2017年第20期29卷 2017 May;29(20)页

作者： Guangyan Qing Qi Lu Yuting Xiong Lei Zhang Hongxi Wang Xiuling Li Xinmiao Liang Taolei Sun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China. Institute of Biomedical and Pharmaceutical Sciences College of Bioengineering Hubei University of Technology 28 Nanli Road Wuhan 430068 P. R. China. Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 P. R. China. International School of Materials Science and Engineering Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China.

Protein post-translational modifications (PTMs), which denote covalent additions of various functional groups (e.g., phosphate, glycan, methyl, or ubiquitin) to proteins, significantly increase protein complexity and diversity. PTMs play crucial roles in the regulation of protein functions and numerous cellular processes. However, in a living organism, native PTM proteins are typically present at substoichiometric levels, considerably impeding mass-spectrometry-based analyses and identification. Over the past decade, the demand for in-depth PTM proteomics studies has spawned a variety of selective affinity materials capable of capturing trace amounts of PTM peptides from highly complex biosamples. However, novel design ideas or strategies are urgently required for fulfilling the increasingly complex and accurate requirements of PTM proteomics analysis, which can hardly be met by using conventional enrichment materials. Considering two typical types of protein PTMs, phosphorylation and glycosylation, an overview of polymeric enrichment materials is provided here, with an emphasis on the superiority of smart-polymer-based materials that can function in intelligent modes. Moreover, some smart separation materials are introduced to demonstrate the enticing prospects and the challenges of smart polymers applied in PTM proteomics.

关键词： enrichment interfaces post-translational modification proteomics smart polymers

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