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A radar-infrared compatible broadband absorbing surface:Design and analysis

Chinese Physics B 2021年第7期30卷 605-612页

作者： Qing-Tao Yu Yuan-Song Zeng Guo-Jia Ma Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology InstituteBeijing 100024China

A radar-infrared compatible stealth surface is designed and *** modifying the radar absorbing material(RAM),the design can theoretically achieve radar-infrared compatibility and broadband radar absorption through surface patterns and structures.A transmission-line-based model(TLM)is developed to analyze the radar absorbing performance of the *** of the structure geometries is conducted aiming to maximize the-10 d B absorption bandwidth in 2–18 *** with optimized structure geometries exhibits a superior absorption bandwidth,more than twice the bandwidth of the original 1.5 mm RAM slab,while maintaining a relatively low infrared emissivity.

关键词： stealth infrared-radar compatible broadband absorbing patterned surface

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Direct Evidence of the Relationship between Piezoelectricity and Catalytic Activity

SSRN

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SSRN 2025年

作者： Gao, Wenpeng Zheng, Huashan Luo, Huajie Zhang, Haibo Jo, Wook Xie, Bing School of Power and Energy Jiangxi Key Laboratory of Green General Aviation Power Nanchang Hangkong University Nanchang330063 China Functional Materials and Acousto-optic Instruments Institute School of Instrumentation Science and Engineering Harbin Institute of Technology Harbin150080 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Ulsan44919 Korea Republic of Beijing Advanced Innovation Center for Materials Genome Engineering China State Key Laboratory of Material Processing and Die & Mould Technology China School of Materials Science and Engineering

Piezocatalysis is highly valued for its efficient energy conversion and environmental capabilities. However, the fundamental connection between piezoelectricity and piezocatalytic activity remains to be thoroughly investigated. Herein, piezoceramic thin flakes with varying levels of piezoelectricity were examined to quantitatively assess the impact of the piezoelectric coefficient (d33) on the piezocatalytic activation in energy and environment applications. The piezoceramic flake, 220 μm thick, possessing the highest piezoelectricity (d33 = 1100 pC/N), demonstrated the highest H2O2 yield (572 μM h-1) and the fastest degradation rate (k = 0.0725 min-1) of Rhodamine B (RhB), exceeding the best performance of previously reported ceramic blocks. In contrast, the same thickness flake with the lowest piezoelectricity (d33 = 150 pC/N) exhibited the weakest piezocatalytic performance. By analyzing internal carrier characteristics and simulating carrier migration pathways under an electric field, a quantitative relationship between piezoelectricity and piezocatalytic activity was established. The piezoceramic flake with higher piezoelectricity demonstrated a higher effective free carrier concentration, a larger number of transiently migrating carriers, and a shorter migration distance due to a stronger built-in electric field, resulting in enhanced piezocatalytic activity. This work clearly elucidates the relationship between piezoelectricity and piezocatalytic activity. © 2025, The Authors. All rights reserved.

关键词： Piezoelectricity

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Room-Temperature Perovskite Ferromagnetic Insulator via Three-Dimensional Tensile Strain

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Physical Review Letters 2025年第1期134卷 016702-016702页

作者： Tianyu Li Yali Yang Shiqing Deng Fangyuan Zhu Tianfu Zhang Yu Chen Huanhua Wang Feixiang Long Xiaolong Li Department of Physical Chemistry University of Science and Technology Beijing Beijing 100083 China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China School of Mathematics and Physics University of Science and Technology Beijing Beijing 100083 China State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

Ferromagnetic insulators are receiving ever-increasing research activities driven not only by the unique advantage of low power loss during spin-wave-based information processing but also by the potential to construct next-generation spintronic devices. However, either the exceedingly rare candidates or the low Curie temperature far below room temperature greatly hinder their practical application. Here, through the modulation of a novel three-dimensional (3D) tensile strain, a room-temperature ferromagnetic insulating state with a Curie temperature as high as 594 K is achieved in self-assembled LaCoO3:MgO nanocomposite thin films. Atomically resolved electron microscopy quantifications identify the 3D strain state of the thin film, where the +2.6% out-of-plane and +2.1% in-plane tensile strains are attributed to the interphase mismatch between the LaCoO3 and MgO building blocks and epitaxial constraint, respectively. Combined with the assessment of electronic states and theoretical analysis, we correlate the strain state with the resulting ferromagnetic insulating property and clarify the underlying mechanisms, by which the emergent strain states break the degeneracy of crystal-field splitting and tailor the on-site Coulomb interactions and spin configuration. These findings underscore the efficacy of a three-dimensional strain strategy in engineering the long-desired high-temperature ferromagnetic insulators via the manipulation of strong spin-lattice coupling, providing a promising approach for the exploitation of exotic functionalities in correlated oxides.

关键词： Perovskite

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Stacking, Strain-engineering Induced Altermagnetism, Multipiezo Effect, and Topological State in Two-Dimensional Materials

arXiv

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arXiv 2025年

作者： Xun, Wei Liu, Xin Zhang, Youdong Wu, Yin-Zhong Li, Ping Jiangsu Engineering Research Center for Design and Application of Intelligent Detection Equipment School of Electronic Engineering Jiangsu Vocational College of Electronics and Information Huaian223003 China School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China State Key Laboratory for Mechanical Behavior of Materials Center for Spintronics and Quantum System School of Materials Science and Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China State Key Laboratory for Surface Physics Department of Physics Fudan University Shanghai200433 China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou310027 China

Altermagnetism, as a newly identified form of unconventional antiferromagnetism, enables the removal of spin degeneracy in the absence of net magnetization that provides a platform for the low power consumption and ultra-fast device applications. However, the rare attention has been paid to the relationship between stacking, strain and altermagnet, multipiezo effect and topological state. Here, we propose a mechanism to realize the altermagnet, multipiezo effect, and topological state in two-dimensional materials by the stacking and strain engineering. Based on the analysis of symmetry, we find that the spin splitting feature related to the Ut, PTt, MzUt, or MzPTt symmetries in altermagnet multilayers. In addition, we find that the stacking engineering can effectively realize the transform from antiferromagnetism to altermagnetism and semiconductor to metal for the Jauns bilayer V2SeTeO. More interestingly, the strain not only induces an intriguing multipiezo effect, encompassing the piezovalley, piezomagnetism and piezoelectric, but also achieves the abundant topological phase. Our findings offer a generalized direction for manipulating the spin splitting, valley polarization, and topological states, promoting practical application of valleytronic and spintronic devices based on two-dimensional altermagnets. © 2025, CC BY.

关键词： Antiferromagnetism

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Enhancing Interfacial Stability and Electrochemical Performance for High-Temperature Operation of Ni-Rich Layered Oxide Cathode-Li Batteries via Tailoring Electrolyte Chemistry

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Small 2025年第19期21卷 e2410235页

作者： Zhang, Qing Zou, Lingfeng Chu, Youqi Mu, Yongbiao Zou, Huanxiu Wei, Xianbin Xu, Xiaoqian Zeng, Lin Shenzhen Key Laboratory of Advanced Energy Storage Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen518055 China SUSTech Energy Institute for Carbon Neutrality Southern University of Science and Technology Shenzhen518055 China Guangzhou Key Laboratory for Surface Chemistry of Energy Materials New Energy Research Institute School of Environment and Energy South China University of Technology Guangzhou510006 China College of Chemistry and Chemical Engineering Hunan Institute of Science and Technology Yueyang414006 China Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518055 China

Achieving both interfacial stability and enhanced electrochemical performance in Ni-rich layered oxide cathode (NCM811)-Li batteries remains a critical challenge, especially at elevated temperatures. Current approaches, including artificial coatings and fluorinated solvents, have improved stability but frequently fail to sustain long-term performance due to increased interfacial resistance or degradation over extended cycling. Here, an advanced electrolyte optimization strategy through the incorporation of triethyl phosphate is proposed to simultaneously enhance the stability of the electrode-electrolyte interface by promoting the formation of robust solid electrolyte interphase and cathode electrolyte interphase layers, thereby preventing side reactions and particle cracking. This results in significantly improved cycle life and thermal stability. The NCM811||Li cells featuring the optimized electrolyte exhibit an impressive initial capacity of 196.8 mAh g−1 and a remarkable Coulombic efficiency of 96.2%, retaining 87.3% after 250 cycles at 1 C and an operating temperature of 60 °C. Even at 10 C, it demonstrates a capacity of 138 mAh g−1 with a retention of 87.9% after 100 cycles, showcasing excellent high-temperature performance and Coulombic efficiency. These results present a promising strategy for enhancing the durability and efficiency of NCM811-Li batteries under demanding conditions. © 2025 Wiley-VCH GmbH.

关键词： Lithium batteries

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Stacking-, strain-engineering induced altermagnetism, multipiezo effect, and topological state in two-dimensional materials

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Applied Physics Letters 2025年第16期126卷

作者： Xun, Wei Liu, Xin Zhang, Youdong Wu, Yin-Zhong Li, Ping School of Electronic Engineering Jiangsu Vocational College of Electronics and Information Huaian223003 China School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China State Key Laboratory for Mechanical Behavior of Materials Center for Spintronics and Quantum System School of Materials Science and Engineering Xi'an Jiaotong University Shaanxi Xi'an710049 China State Key Laboratory for Surface Physics Department of Physics Fudan University Shanghai200433 China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou310027 China

Altermagnetism, a recently identified form of unconventional antiferromagnetism (AFM), enables the removal of spin degeneracy in the absence of net magnetization that provides a platform for the low power consumption and ultra-fast device applications. However, a little attention has been paid to the relationship between stacking, strain, and altermagnet, the multipiezo effect, and the topological state. Here, we propose a mechanism to realize the altermagnet, the multipiezo effect, and the topological state in two-dimensional (2D) materials by the stacking and strain engineering. Based on the analysis of symmetry, we find that the spin splitting feature related to the Ut, PTt, M z U t , or M z PTt symmetries in altermagnet multilayers. In addition, we find that the stacking engineering can effectively realize the transform from antiferromagnetism to altermagnetism and semiconductor to metal for the Janus bilayer V2SeTeO. More interestingly, the strain not only induces an intriguing multipiezo effect, encompassing the piezovalley, piezomagnetism, and piezoelectric, but also achieves the abundant topological phase. Our findings offer a generalized direction for manipulating the spin splitting, valley polarization, and topological states, promoting practical application of valleytronic and spintronic devices based on two-dimensional altermagnets. © 2025 Author(s).

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Transparent Organic Glass With Bright Triplet Excitons for High-Spatial-Resolution Indirect X-Ray Imaging via Heavy Metal Halide Incorporation

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advanced Optical Materials 2025年第10期13卷

作者： Xu, Ziwei Li, Nan Feng, Xiaolong Yan, Xiangyang He, Tong Zhang, Lu Liu, Shengzhong Yang, Zhou 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 Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an 710062 China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China University of the Chinese Academy of Sciences Beijing 100039 China

Organic scintillators are emerging as promising candidates for indirect X-ray imaging due to their tunable luminescent properties. However, achieving high transparency while maintaining a high content of organic luminescent material in organic scintillation pellets remains a challenge, which limits their imaging performance. In this study, a transparent luminescent organic glass based on ethyl-triphenyl-phosphonium chloride (ETPCl) is presented, which exhibits bright exciton emission and enhance X-ray attenuation through the incorporation of lead halide. Remarkably, the addition of lead halide does not compromise the glass's high transparency, which remains ≈90% in the 400–800 nm wavelength range. Transient absorption measurements further reveal that the presence of heavy atoms enhances intersystem crossing and improves triplet emission efficiency, increasing the photoluminescence quantum yield from 7.1% in pure ETPCl glass to 35.4% in glass containing 10 mol.% PbCl₂. Additionally, the heavy atom effect enhances X-ray attenuation, leading to increased radioluminescence intensity. X-ray imaging experiments demonstrate a spatial resolution of up to 19.9 lp mm⁻¹ at a modulation transfer function value of 0.2. These findings provide a promising approach for fabricating transparent organic scintillator glasses with improved triplet exciton utilization and X-ray attenuation, enabling high-resolution X-ray imaging. © 2025 Wiley-VCH GmbH.

关键词： heavy atom effect imaging scintillator spatial resolution triplet emission

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A study on corrosion mechanism of defective fluorite-type RE2Hf2O7 (RE=Dy, Yb) material to CMAS attack at 1300 °C: Experiments and Ab initio molecular dynamics simulations

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Ceramics International 2025年

作者： Zhao, Hui Miao, Qiang Liang, Wenping Liu, Ruixiang Sun, Shijie Zhang, Xiaofeng College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Yudao Street 29 Jiangsu Province Nanjing210016 China Wuxi Research Institute Nanjing University of Aeronautics and Astronautics Luonan Street 8 Jiangsu Province Wuxi214154 China National Key Laboratory of Advanced Composites AECC Beijing Institute of Aeronautical Materials Beijing100095 China National Engineering Laboratory for Modern Materials Surface Engineering Technology Institute of New Materials Guangdong Academy of Sciences Guangzhou510651 China

The effectiveness of candidate Dy- and Yb-bearing hafnate materials as thermal barrier coatings (TBCs) in resisting CMAS (calcium-magnesia-alumina-silicon) corrosion at 1300 °C was investigated using both experimental and simulation-based approaches. The observed in-situ CMAS wetting results indicate that the dissolution of DyO1.5 into melts raises the temperature at which corrosion begins. The sticking temperature point of CMAS on the Dy2Hf2O7 surface is 1268 °C, 26 °C higher than that on the Yb2Hf2O7 surface. The experimental results indicate that compared to Yb2Hf2O7, the formation of Dy-bearing garnet products in the reaction of Dy2Hf2O7 with CMAS creates a protective layer that effectively suppresses further CMAS infiltration. The corrosion thickness of Dy2Hf2O7 is only one-half to one-third of that of Yb2Hf2O7 after 1h, 10h, and 20h exposure. The interfacial atomic diffusivity, energy barrier of atom pair and electronegativity characteristics influence the precipitation of products such as apatite and garnet along the Dy- and Yb-bearing hafnate/CMAS interface. The simulated results suggest that the exceptional Al diffusion rate (18.5014 Å2/ps), lower Al-O and Al-Dy bonding energy barriers (0.31890 eV and 0.41921 eV), and the ease of Al dissolution in CMAS polar solution enhance the formation of Dy-bearing garnet. This study explores two novel hafnate materials as TBC candidates and examines the factors influencing their performance from both chemical and physical perspectives, accompanied by a discussion of guidelines for the rare earth selection of CMAS-resistant hafnate TBCs. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Thermal barrier coatings

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Urbanization has enhanced compound heatwaves

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Journal of Geographical sciences 2025年第5期35卷 1115-1131页

作者： Sun, Peng Yu, Shifang Yao, Rui Sun, Zhongbao Singh, Vijay P. Bian, Yaojin Ge, Chenhao Zhang, Qiang School of Geography and Tourism State Key Laboratory of Earth Surface Processes and Resource Response in the Yangtze-Huaihe River Basin Anhui Normal University Wuhu Anhui China Key Laboratory of Hydrometeorological Disaster Mechanism and Warning of Ministry of Water Resources Nanjing University of Information Science & Technology Nanjing China Engineering Technology Research Center of Resources Environment and GIS Anhui Normal University Wuhu Anhui China Department of Biological and Agricultural Engineering Zachry Department of Civil and Environmental Engineering Texas A&M University College Station USA National Water and Energy Center UAE University Al Ain UAE Advanced Interdisciplinary Institute of Environment and Ecology Guangdong Provincial Key Laboratory of Wastewater Information Analysis and Early Warning Beijing Normal University Zhuhai Guangdong China

Under global warming, understanding the impact of urbanization on the characteristics of different heatwaves is important for sustainable development. In this study, we investigated the changes of heatwaves characteristics in the Yangtze River Delta urban agglomeration (YRDUG) and analyzed the influencing mechanisms of urbanization. Results showed that: (1) the duration, frequency, and intensity of NHWs (Nighttime Heatwaves) and CHWs (Daytime-nighttime compound Heatwaves) had shown a significant increase and the CHWs showed the greatest increasing trend. Furthermore, the NHWs exhibited higher durations, frequencies, and intensities compared to DHWs (Daytime Heatwaves); (2) Since 1990, the DHWs and CHWs were greater in urban areas than in rural areas, NHWs had been more pronounced in rural areas than in urban centers; and (3) Cloud cover, solar radiation, etc. affected heatwaves. Furthermore, in the process of urbanization, the increase in impervious area and the decrease in green land exacerbated heatwaves. Considering the combined effect of DHWs and NHWs, CHWs continued to increase.

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Enhancing strength at elevated temperatures via dynamic high-density mobile dislocations in Mg alloys

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Journal of Magnesium and Alloys 2025年

作者： Fan, Mingyu Cui, Ye Zhou, Xin Chen, Junming Zhang, Yang Sun, Lixin Brechtl, Jamieson Fang, Daqing Li, Qian Ding, Qingqing Bei, Hongbin Liaw, Peter K. Xue, Yanzhuo Wang, Xun-Li Lu, Yang Zhang, Zhongwu Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China Department of Physics and Center for Neutron Scattering City University of Hong Kong Kowloon Hong Kong999077 China Shenzhen Research Institute of City University of Hong Kong Shenzhen Hi-Tech Industrial Park Shenzhen518057 China Department of Mechanical Engineering City University of Hong Kong Kowloon China Physikalisches Institut Westfälische Wilhelms-Universität Münster48149 Germany Department of Materials Science and Engineering The University of Tennessee KnoxvilleTN37996-2100 United States State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an710049 China National Engineering Research Center for Magnesium Alloy Chongqing University Chongqing400044 China State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai University Shanghai200444 China School of Materials Science and Engineering Zhejiang University Hangzhou310027 China College of Shipbuilding Engineering Harbin Engineering University Harbin150001 China Department of Mechanical Engineering The University of Hong Kong Hong Kong999077 China

Dislocation strengthening, as one of the methods to simultaneously enhance the room temperature strength and ductility of alloys, does not achieve the desired strengthening and plasticity effect during elevated-temperature deformation. Here, we report a novel strategy to boost the dislocation multiplication and accumulation during deformation at elevated temperatures through dynamic strain aging (DSA). With the introduction of the rare-earth element Ho in Mg-Y-Zn alloy, Ho atoms diffuse toward dislocations during deformation at elevated temperatures, provoking the DSA effect, which increases the dislocation density significantly via the interactions of mobile dislocations and Ho atoms. The resulting alloy achieves a great enhancement of dislocation hardening and obtains the dual benefits of high strength and good ductility simultaneously at high homologous temperatures. The present work provides an effective strategy to enhancing the strength and ductility for elevated-temperature materials. © 2025

关键词： Ductility

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