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Enhanced electromagnetic tunability of barium strontium titanate films via coating Pr modified yttrium iron garnet layer

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Journal of materials science & technology 2024年第35期202卷 174-182页

作者： Tejing Jiao Caiyin You Na Tian Zongfan Duan Fuxue Yan Pengrong Ren Heguang Liu School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Advanced Material Analysis and Test Center Xi’an University of TechnologyXi’an 710048China

It is hard to simultaneously realize the high dielectric tunability and low loss for the single Ba_(0.6)Sr_(0.4)TiO_(3)(BST)dielectric film made through chemical *** structured Y_(2.80)Pr_(0.20)Fe_(5)O_(12)(YPrIG)ex-hibits the merits of high saturation magnetization and a much high resistivity,which are helpful for realizing magnetoelectric double tuning and suppressing the dielectric loss of BST *** this work,Y_(2.80)Pr_(0.20)Fe_(5)O_(12)/Ba_(0.6)Sr_(0.4)TiO_(3)(YPrIG/BST)composite films were fabricated by sol-gel *** com-posite films exhibited a low dielectric loss(0.0087),and got a magnetic tunability of 11.73%at 10 kOe and 1.44 *** with BST film,the tunability of YPrIG/BST film was enhanced from 56.25%to 73.24%under the bias electric field of 800 kV/***,YPrIG/BST films exhibited an electromag-netic double *** electromagnetic tunability of YPrIG/BST composite films was as high as 80.40%at 1.44 MHz,under the DC bias electric field of 800 kV/cm and magnetic field of 10 *** phenomenon can be explained in terms of the superposition effect of electric field and magnetic field.

关键词： YPrIG/BST thin film Sol-gel method Dielectric properties Electromagnetic tunability Figure of merit

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advanced nanofabrication for elastic inorganic aerogels

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Nano Research 2024年第10期17卷 8842-8862页

作者： Xiaota Cheng Xinyi Chang Fan Wu Yalong Liao Kai Pan Hao Fong Jianyong Yu Yi-Tao Liu Bin Ding Innovation Center for Textile Science and Technology College of TextilesDonghua UniversityShanghai 201620China Aerospace Institute of Advanced Material and Processing Technology Beijing 100074China College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

Inorganic aerogels with low density,high porosity,large specific surface area,and superior mechanical properties are excellent candidate materials in fields such as thermal management,energy,catalysis,and biomedical applications.A comprehensive overview of existing elastic inorganic aerogels is provided,covering their structural units,preparation methods,mechanical performances,and ***,based on the constituent building blocks and microstructures,a detailed analysis of the mechanical properties and guidelines for elastic design of aerogels is *** with a succinct summary of prospective developmental direction,this review deliberates on the challenges and potential opportunities of elastic inorganic aerogels,with the intent of providing a versatile platform for designing new types of elastic inorganic aerogels for various applications.

关键词： inorganic aerogels compressive stretchable fabrication mechanical performances applications

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Effect of orbital symmetry on atomic ionization in near-infrared laser fields

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Chinese Physics B 2025年第1期34卷 289-292页

作者： Manqi Xu Shilin Hu Li Guo Jing Chen Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou 515063China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou UniversityShantou 515063China Department of Physics Shanghai Normal UniversityShanghai 200234China Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China

We have performed a comparative study of the photoelectron spectra adopting different initial states(2s or 2_(p0))of hydrogen atoms in a near-infrared laser pulse by using the full three-dimensional time-dependent Schr?dinger *** is demonstrated that the atomic photoelectron spectra oscillate out of step as a function of electron kinetic energies for different initial states(2s or 2_(p0)),which is well reproduced by the simulations based on strong field approximation,and the above distinct feature is ascribed to the different interferences from the partial electron wave packets detached by positive and negative electric fields for different initial states of 2s and 2_(p0).

关键词： orbital symmetry photoelectron spectra strong-field approximation

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Microstructural evolution and properties of the Cu-Cr-Ti alloys after cold deformation and subsequent aging treatment

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Progress in Natural science:materials International 2024年第6期34卷 1258-1266页

作者： Xueqin Dai Shuguo Jia Yanjun Zhou Yingxuan Ma Zhenpeng Xiao Huiwen Guo Xiao Cao Yuduo Fu Kexing Song Zongye Ding School of Material Science and Engineering Henan University of Science and Technology Provincial and Ministerial Co-construction Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing Technology Chinalco Luoyang Copper Processing Co Ltd School of Mechatronic Engineering and Automation Foshan University National United Engineering Laboratory for Advanced Bearing Tribology Henan University of Science and Technology

The increasingly desirable mechanical and physical properties limits the application of traditional Cu-Cr alloys,and deserves the compositional design and processing optimization of Cu-Cr-Ti alloys. The effects of cold deformation and aging treatment on the microstructures and properties of the Cu-0.2Cr-0.08Ti alloys were investigated. The shapes of precipitates and evolution of dislocations in the specimens with increasing deformation amounts and aging times was uncovered, and the strengthening mechanisms of Cu-Cr-Ti alloys were elucidated by using TEM and HRTEM analysis. When the deformation amount is not higher than 40 %, the increased deformation amounts increases the dislocation density in the Cu-0.2Cr-0.08Ti alloy, promoting the formation of dislocation cell and dislocation tangles with small size. The precipitation of fine Cr particles coherent with Cu matrix is accelerated, accompanied by the enhancement of microhardness and electrical *** Cu-0.2Cr-0.08Ti alloy with 40 % deformation amounts after aging at 480°C for 1 h has the optimal comprehensive properties, which is related to the increasing dislocation density, the refinement of Cu grains and the precipitation of Cr particles. The enhanced strength of Cu-0.2Cr-0.08Ti alloy with 40 % deformation amounts after aging at 480°C for 1 h is attributed to the solute strengthening of solute atoms, precipitate strengthening of fine Cr particles, dislocations strengthening and grain boundary strengthening mechanisms.

关键词： Cu-Cr-Ti alloy Cold deformation Aging treatment Microstructures Precipitates

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Towards understanding and prediction of corrosion degradation of organic coatings under tropical marine atmospheric environment via a data-driven approach

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International Journal of Minerals,Metallurgy and materials 2025年第5期32卷 1151-1161页

作者： Shaopeng Liu Lingwei Ma Jinke Wang Yiran Li Haiyan Gong Haitao Ren Xiaogang Li Dawei Zhang Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Luoyang Ship Material Research Institute Sanya 572032China

The corrosion degradation of organic coatings in tropical marine atmospheric environments results in substantial economic losses across various *** complexity of a dynamic environment,combined with high costs,extended experimental periods,and limited data,places a limit on the comprehension of this *** study addresses this challenge by investigating the corrosion de-gradation of damaged organic coatings in a tropical marine environment using an atmospheric corrosion monitoring sensor and a random forest(RF)*** damage simulation,a polyurethane coating applied to a Fe/graphite corrosion sensor was intentionally scratched and exposed to the marine atmosphere for over one *** correlation analysis was performed for the collection and filtering of en-vironmental and corrosion current *** to the RF model,the following specific conditions contributed to accelerated degrada-tion:relative humidity(RH)above 80%and temperatures below 22.5℃,with the risk increasing significantly when RH exceeded 90%.High RH and temperature exhibited a cumulative effect on coating degradation.A high risk of corrosion occurred in the *** RF model was also used to predict the coating degradation process using environmental data as input parameters,with the accuracy show-ing improvement when the duration of influential environmental ranges was considered.

关键词： organic coating degradation atmospheric corrosion machine learning exposure test random forest coating sensor

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Enhanced breakdown strength of BaTiO_(3)-based multilayer ceramic capacitor by structural optimization

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Rare Metals 2023年第8期42卷 2552-2561页

作者： Qian Liu Hua Hao Qing-Hu Guo Zhong-Hui Shen Jian Wang Ming-He Cao Zhong-Hua Yao Han-Xing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and EngineeringWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528220China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya 572000China International School of Material Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Material Science and EngineeringWuhan University of TechnologyWuhan 430070China

0.5 wt%Nb_(2)O_(5)doped 0.12BiAlO_(3)-0.88BaTiO_(3)(12BA5N)multilayer ceramic capacitor(MLCC-1)was prepared,which satisfied EIA X7R specification(where X is the minimum temperature,R is the percentage of capacitance variation limit)at 1 *** distribution of internal electric field under breakdown voltage was simulated by finite element method(FEM),indicating that the electric field strength increased significantly at the terminal of internal *** areas may become the headstream of breakdown for MLCC-1 due to the shape *** order to improve the breakdown performance of MLCC-1,it was optimized by 12BA5N+2G green sheets(prepared by 12BA5N ceramic powder with 2 wt%B-Al-Si glass additive),then MLCC-2 was obtained which satisfied EIA X8R *** BDS rose from 20 to29.4 kV·mm^(-1),and the electric field distribution of dielectric layer was also analyzed by ***,it was also found that the grain size and the dielectric constants of"core"and"shell"parts for the 12BA5N+2G dielectric layer both contributed to the enhanced BDS of MLCC-2according to the simulation results from FEM.

关键词： Multilayer ceramic capacitor(MLCC) Breakdown strength(BDS) Simulation Grain size Dielectric constant

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Enhanced N_(2)electroreduction activity of single-atom catalysts:Modulating the linear scaling relationship by coordination engineering and dual-site strategies

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Nano Research 2025年第3期18卷 696-709页

作者： Renyi Li Caimu Wang Jiao Zhang Wei Guo Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Frontiers Science Center for High Energy Material(MOE) Beijing Institute of TechnologyBeijing 100081China

The volcano plot is widely used to elucidate the activity trends among different catalysts,thereby effectively screening and guiding catalyst ***,the inherent linear scaling relationship(LSR)constrains the breakthrough in the activity of catalysts,and the understanding of the activity limit in volcano plot is still *** this work,by employing first-principles calculations and microkinetic modeling,we proposed coordination engineering(CE)and dual-site(DS)strategies to surpass the Sabatier’s limitation of WS_(2)-supported TM(TM@WS_(2))single-atom catalysts(SACs)for electrocatalytic nitrogen reduction reaction(eNRR).We found that the LSR betweenΔG(^(*)N_(2)→^(*)N_(2)H)andΔG(^(*)NH_(2)→^(*)NH_(3))was optimized to be closer to the ideal space of eNRR activity after modulating TM@WS_(2)SACs by these two design *** combining the reaction selectivity trend plot,we picked out N-Os@WS_(2),C-Ir@WS_(2),Fe_(2)@WS_(2),and Ru_(2)@WS_(2)as optimal eNRR catalysts with low limiting potential(UL),and N-Os@WS_(2)SAC(UL:-0.28 V)outperforms the best eNRR catalyst among TM@WS_(2)*** constructing explicit solvent models,we conducted a detailed study on the reaction kinetics of proton transfer over these four *** propose that the activity enhancement in TM@WS_(2)SACs for eNRR can be attributed to the ligand effect and geometric effect brought about by CE and DS strategies,improving the donation-backdonation process of electron transfer between N_(2)and the active *** designed catalyst has certain resistance to demetallization and agglomeration under simulated solvent *** work provides a feasible design strategy for the activity enhancement of SACs and brings a new perspective to deeply understanding the volcano plot in heterogeneous catalysis.

关键词： linear scaling relationship volcano plot single-atom catalysts density functional theory(DFT) electrochemical nitrogen reduction

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Quantum-mechanical understanding on structure dependence of image potentials of single-walled boron nitride nanotubes

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Chinese Physics B 2024年第12期33卷 467-475页

作者： Yu Zhang Zhiman Zhang Weiliang Wang Shaolin Zhang Haiming Huang Solid State Physics&Material Research Laboratory School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China Research Center for Advanced Information Materials(CAIM) Huangpu Research and Graduate School of Guangzhou UniversityGuangzhou 510555China School of Physics Guangdong Province Key Laboratory of Display Material and TechnologyCenter for Neutron Science and TechnologySun Yat-sen UniversityGuangzhou 510275China

The recent discovery of field emission devices based on one-dimensional nanostructures has attracted much interest in emerging applications on next-generation flat panel displays,molecule-based sensors,and so *** achieve a comprehensive understanding of surface potentials at the nano-emitters during the tunneling process,in this study we systematically investigated the image potentials of single-walled boron nitride nanotubes with different edges,diameters and lengths in the frame of a composite first-principles *** image potentials of zigzag single-walled boron nitride nanotubes are found to be dependent on the non-equivalent *** the image potentials of isolated armchair single-walled boron nitride nanotube can be well fitted with the image potential of an ideal metal sphere of a size comparable to the tube *** the contrary,the image potentials of zigzag and grounded armchair single-walled boron nitride nanotubes exhibit a strong length-dependence characteristic and are significantly different from that of an ideal metal sphere,which originates from the significant axial symmetry breaking of induced charge at the tip for the long *** correlation between the testing electron and electronic structure of single-walled boron nitride nanotube has also been discussed.

关键词： boron nitride nanotubes quantum chemistry image potentials structure dependence

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Screening A-site ordered quadruple perovskites for alkaline hydrogen evolution reaction via unifying electronic configuration descriptor

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Chinese Physics B 2024年第12期33卷 448-456页

作者： Ning Sun Wenbo Li Yang Qin Zhichuan Zheng Bowen Zhang Xiangjiang Dong Peng Wei Yixiao Zhang Xian He Xinyu Xie Kai Huang Lailei Wu Ming Lei Huiyang Gou Runze Yu State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and Telecommunications(BUPT)Beijing 100876China Center for High Pressure Science and Technology Advanced Research Beijing 100193China College of Material Science and Engineering Liaoning Technical UniversityFuxin 123000China College of Material Science and Engineering Yanshan UniversityQinhuangdao 066004China

Dynamic adsorption processes of reaction intermediates for alkaline hydrogen evolution(HER)catalysts are still confusing to ***,we report a series of A-site ordered quadruple perovskite ruthenium-based electrocatalysts ACu_(3)Ru_(4)O_(12)(A=Na,Ca,Nd,and La),with the target sample SrCu_(3)Ru_(4)O_(12)exhibiting a very low overpotential(46 mV@10 mA·cm^(-2))and excellent catalytic stability with little decays after 48-h durability *** tuning A-site cations can change the average valence state of Cu and Ru,thus the plot of HER activity versus the average Ru valence number shows a volcano-type *** functional theory indicates that the Ru 4d orbitals of SrCu3Ru4O12possesses the most suitable d-band center position among the five samples,which might be the key parameter to determine the catalytic *** work provides further insight into the discovering advanced,efficient hydrogen evolution catalysts through designing precise descriptor.

关键词： Ru-based electrocatalyst density functional theory descriptor quadruple perovskites hydrogen evolution reaction

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Precisely modulating covalent and coordination bonds in the porous network for highly selective metal ion extraction

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science China Chemistry 2024年第4期67卷 1039-1040页

作者： Jie Li Xiao Feng Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials Key Laboratory of Cluster ScienceMinistry of EducationAdvanced Technology Research Institute(Jinan)Frontiers Science Center for High Energy MaterialSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Scandium(Sc)is recognized as a“strategic”and“critical”element by several countries,including the *** Russia,owing to its wide range of applications in high-tech fields such as superconductivity,alloys,lasers,nucle... 详细信息

关键词： alloys coordination network

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