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Effects of La and Ce on the microstructure,thermal conductivity and strength synergy of the as-extruded Mg-Mn-RE alloys

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Journal of Magnesium and Alloys 2025年第2期13卷 654-667页

作者： Huafeng Liu Taiki Nakata Chao Xu Guangze Tang Danyang Li Xiaojun Wang Guisong Wang Shigeharu Kamado Lin Geng State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin150001PR China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001PR China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka940-2188Japan Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin150001PR China School of Physics Harbin Institute of TechnologyHarbin150001PR China

High thermal conductivity and high strength Mg-1.5Mn-2.5Ce alloy with a tensile yield strength of 387.0 MPa,ultimate tensile strength of 395.8 MPa,and thermal conductivity of 142.1 W/(m·K)was successfully fabricated via hot *** effects of La and Ce additions on the microstructure,thermal conductivity,and mechanical properties of the Mg-1.5Mn alloy were *** results indicated that both the as-extruded Mg-1.5Mn-2.5La and Mg-1.5Mn-2.5Ce alloys exhibited a bimodal grain structure,with dynamically precipitated nano-scaleα-Mn *** comparison with La,the addition of Ce enhanced the dynamic precipitation more effectively during hot extrusion,while its influence on promoting the dynamic recrystallization was relatively *** high tensile strength obtained in the as-extruded Mg-1.5Mn-2.5RE alloys can be attributed to the combined influence of the bimodal grain structure(with fine dynamic recrystallized(DRXed)grain size and high proportion of un-dynamic recrystallized(unDRXed)grains),dense nano-scale precipitates,and broken Mg12RE phases,while the remarkable thermal conductivity was due to the precipitation of Mn-rich phases from the Mg matrix.

关键词： Mg-Mn-RE alloys Thermal conductivity Mechanical properties Dynamic precipitation

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Synthesis of wafer-scale monolayer MoS_(2) on sapphire: Unlocking the influence of key growth parameters

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Nano Research 2025年第2期18卷 930-939页

作者： Rong Song Dingyi Shen Dongyan Liu Jingyi Liang Zimei Zhang Jingmei Tang Liang Chen Bo Li Jia Li Xidong Duan Hunan Key Laboratory of Two-Dimensional Materials State Key Laboratory for Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringChongqing Research InstituteHunan UniversityChangsha 410082China Hubei Key Laboratory of Energy Storage and Power Battery School of MathematicsPhysics and Optoelectronic EngineeringHubei University of Automotive TechnologyShiyan 442002China College of Semiconductors(College of Integrated Circuits) Hunan UniversityChangsha 410082China

Large-scale synthesis of high-quality two dimensional(2D)semiconductors,such as molybdenum disulfide(MoS_(2)),is a prerequisite for their lab-to-fab *** is crucial to systematically explore and understand the influence of key synthetic conditions on the nucleation,uniformity,and quality of MoS_(2) ***,we report the epitaxial growth of high-quality and uniform monolayer MoS_(2) films on 2-in c-plane sapphire by chemical vapor deposition(CVD)method under optimized growth conditions(0–1 mg NaCl,adequate S/Mo ratio,and the addition of 0–1 sccm O2).We systematically explore the influence of critical synthetic conditions on the nucleation,and stitching of MoS_(2) domains over the wafer scale,including the dosage of the alkali metal salt NaCl additive,the evaporation temperature of MoO_(3),the distance between MoO_(3) and the substrate,and the flow rate of O_(2).Among them,the dosage of NaCl and the S/Mo ratio have important influences on the quality and film coverage of MoS_(2),while the flow rate of O_(2) plays a key role in controlling the nucleation density and domain *** further discovered that a-plane sapphire could easily guide the unidirectional growth of MoS_(2) without the need for other specific synthetic conditions compared with c-plane and m-plane *** field-effect transistors(FETs)fabricated from the full-coverage films show an average and the highest mobilities of 28.5 and around 45 cm^(2)·V−1·s^(-1),respectively.

关键词： wafer-scale MoS_(2)films chemical vapor deposition critical synthetic conditions monolayer field-effect transistors

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Improving wear resistance of 3D printed alumina-based ceramics via sintering temperature

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China Foundry 2025年第2期22卷 151-162页

作者： Jing-wen Sun He Li Yun-song Mu Bao-xia Mu Yan-hua Chen Paolo Colombo School of Materials Science and Engineering Xinjiang Key Laboratory of Solid State Physics and DevicesXinjiang UniversityUrumqi 830046China School of Materials Science and Engineering Xinjiang Environmental and Functional Materials Engineering Research CenterXinjiang UniversityUrumqi 830046China School of Physics Science and Technology Xinjiang UniversityUrumqi 830046China Department of Industrial Engineering University of PadovaPadova 35131Italy

Ceramic materials with intricate structures can be efficiently fabricated using stereolithography(SLA)based 3D printing technology,offering advantages over traditional *** temperature has primary effect on properties of *** study investigated the crucial sintering temperature for 3D printed ceramics to ensure the desired *** results indicate that all samples exhibit a consistent layered structure across the experimental sintering *** the sintering temperature is increased from 1,250℃ to 1,350℃,the grain's morphology changes from spherical to *** morphology analysis reveals a decrease in surface roughness at sintering temperatures above 1,350℃.Mechanical tests show improved flexural strength and stiffness as the sintering temperature *** and wear experiments demonstrate that as the sintering temperature increases from 1,450℃ to 1,550℃,the wear pattern on ceramic surfaces transitions from deep pits to shallow *** increase in sintering temperature effectively enhances the wear resistance of 3D printed alumina *** improvement plays a significant role in expanding the application field of these ceramics,prolonging the lifespan of parts,reducing production costs,enhancing performance,and promoting environmental *** this study,ceramics achieve the highest strength and best wear resistance when sintered at 1,600℃,resulting in the best overall performance.

关键词： sintering temperature friction and wear properties stereolithography alumina ceramics

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Stabilization of zinc anode by trace organic corrosion inhibitors for long lifespan

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Chinese Chemical Letters 2025年第3期36卷 538-543页

作者： Wenfeng Shao Chuanlin Li Chenggang Wang Guangsen Du Shunshun Zhao Guangmeng Qu Yupeng Xing Tianshuo Guo Hongfei Li Xijin Xu School of Physics and Technology University of JinanJi’nan 250022China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China School of Chemistry and Chemical Engineering Shandong UniversityJi’nan 250100China School of System Design and Intelligent Manufacturing Southern University of Science and TechnologyShenzhen 518000China

Aqueous zinc-ion batteries are highly favored for their enhanced safety and reduced ***,there exist challenges including zinc dendrite,hydrogen evolution,and surface corrosion to be *** electrolyte additives is a highly convenient approach to solving zinc anode-related *** by industrial corrosion protection,a trace amount of the corrosion inhibitor urotropine(URT)is used as an electrolyte additive to protect the zinc *** calculation and experimental analysis confirm the adsorption of URT molecules onto the surface of Zn,which inhibits hydrogen *** adsorption further leads to the formation of an inorganic-organic bilayer solid electrolyte interface(SEI)on the surface of the zinc anode,effectively protecting the Zn anode from corrosion,hydrogen evolution and zinc *** presence of SEI enables symmetrical Zn//Zn cells to exhibit a long cycling performance of 1750 h at 1mA/cm^(2)and an average coulombic efficiency of 99.0%at 1mA/cm^(2)in Zn//Cu *** being coupled with polyaniline(PANI),the Zn//PANI full battery displays excellent cycle stability and specific capacity.

关键词： Solid electrolyte interface Aqueous zinc-ion battery Corrosion inhibitors Electrolyte additive Zinc anode

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Investigation of He retention in W through combined He characterization methods and cluster dynamics model

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nuclear Science and Techniques 2025年第3期36卷 201-213页

作者： Jie Qiu Xun-Xiang Hu Cong-Yi Li Wendy Garcia Tan Shi Sha Xue Jamie L.Weaver HHeather Chen-Mayer Brian D.Wirth SJTU Paris Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China Department of Nuclear Engineering University of TennesseeKnoxvilleTN 37996USA School of Physics Sichuan UniversityChengdu 610065China Oak Ridge National Laboratory Oak RidgeTN 37830USA Global Institute of Future Technology Shanghai Jiao Tong UniversityShanghai 200240China School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an 710049China Nuclear Engineering Program The Ohio State UniversityColumbusOH 43210USA Material Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD 20899USA

Tungsten(W)is the leading plasma-facing candidate material for the International Thermonuclear Experimental Reactor and next-generation fusion *** impact of synergistic helium(He),irradiation-induced microstructural changes,and the corresponding thermal-mechanical property degradation of W are critically important but are not well understood *** the performance of W in fusion environments requires understanding the fundamentals of He-defect interactions and the resultant He bubble nucleation and growth in *** this study,He retention in helium-ion-implanted W was assessed using neutron depth profiling(NDP),laser ablation mass spectrometry(LAMS),and thermal desorption spectroscopy(TDS)following 10 keV room-temperature He implantation at various *** three experimental techniques enabled the determination of the He depth profile and retention in He-implanted W.A cluster dynamics model based on the diffusion-reaction rate theory was applied to interpret the experimental *** model successfully predicted the He spatial depth-dependent profile in He-implanted W,which was in good agreement with the LAMS *** model also successfully captured the major features of the He desorption spectra observed in the THDS *** NDP quantified total He concentration values for the samples;they were similar to those estimated by ***,the depth profiles from NDP and LAMS were not comparable due to several *** combination of modeling and experimentation enabled the identification of possible trapping sites for He in W and the evolution of He-defect clusters during the TDS thermal annealing process.

关键词： Tokamak nuclear reactor Nondestructive detection

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Unraveling the impacts of intermolecular interaction on morphology evolution for highly efficient organic solar cells and modules

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Science China Chemistry 2025年第1期68卷 264-272页

作者： Xueqing Ma Yingying Cheng Yuqiang Liu Xinming Zheng Guangliu Ran Hongxiang Li Xinyue Cui Andong Zhang Wenkai Zhang Pei Cheng Wenchao Huang Zhishan Bo Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China Key State Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu 610065China

Understanding the effect of intermolecular interaction on the growth dynamic of active layers is critical for advancing organic solar cells(OSCs).However,the diverse structure of donors and acceptors makes the research *** with customizable structures and properties could simplify this ***,we meticulously tailor two additives of 3,4-ethylenedioxythiophene(EDOT)and 2,5-dibromo-3,4-ethylenedioxythiophene(DBEDOT),possessing distinct intermolecular interaction features to elaborate the inherent *** is found that varied interaction strengths can alter film formation *** enhanced intermolecular interaction between the DBEDOT and non-fullerene acceptor BTP-e C9-4F results in pre-aggregation and longer crystallization duration of BTP-e C9-4F,facilitating the formation of films with compact molecular packing and decent phase ***,exciton dissociation and charge transport become more ***,devices processed with DBEDOT exhibit a remarkable power conversion efficiency of 19.35%in small-area OSCs and 14.11%in bladecoated 5 cm×5 cm organic solar ***,OSCs can maintain 80%of their initial efficiency after continuous annealing at 85℃for over 2,100 h.

关键词： organic solar cell non-fullerene acceptor film growth molecular packing intermolecular interaction

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Pronounced advance on typhoon track forecast with global convection-permitting model

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Science Bulletin 2025年第9期70卷 1424-1428页

作者： Gu, Jun Zhao, Chun Li, Gudongze Feng, Jiawang Xu, Mingyue Du, Qiuyan Xia, Zihan Li, Yubin Chen, Guanghua Hao, Xiaoyu Chen, Junshi An, Hong Deep Space Exploration Laboratory / School of Earth and Space Sciences / CMA-USTC Laboratory of Fengyun Remote Sensing / State Key Laboratory of Fire Science / Institute of Advanced Interdisciplinary Research on High-Performance Computing Systems and Software University of Science and Technology of China Hefei230026 China Laoshan Laboratory Qingdao266237 China CAS Center for Excellence in Comparative Planetology University of Science and Technology of China Hefei230026 China School of Atmospheric Physics Nanjing University of Information Science and Technology Nanjing210044 China Key Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Beijing100029 China School of Computer Science and Technology University of Science and Technology of China Hefei230026 China

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Controllable and Flexible 4D Fabrication Strategy for Expandable Micro-sensor Elements on the Fiber

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Journal of Lightwave technology 2025年第10期43卷 4802-4807页

作者： Li, Chang-Xu Chen, Qiao-Ling Li, Xi-Lin Qu, Jian Liu, Yi Qu, Shi-Liang Harbin Institute of Technology School of Physics Harbin15001 China Jilin University College of Electronic Science and Engineering State Key Laboratory of Integrated Optoelectronics Changchun130012 China University of Electronic Science and Technology of China School of Information and Communication Engineering Chengdu611731 China Soochow University Jiangsu Provincial Key Laboratory of Advanced Robotics School of Mechanical and Electric Engineering Suzhou215123 China

In the realm of high-precision integrated applications involving optical fiber sensor components and materials, conventional macro-processes such as fiber coating and tip dispensing lack precise control and flexibility. In this paper, a two-photon polymerization technique was employed to fabricate a microscopic F-P framework and a peripheral fence on the tip of a single-mode fiber. Subsequently, precision dispensing methods were utilized to introduce hydrogel into the fence. A concept of the "sensitization-fence"is introduced to enhance sensitivity. Finite element simulations revealed that as the height of the fence increased, the displacement of the F-P sensing cavity also increased, indicating heightened sensitivity. In the subsequent experimental exploration, acrylic acid hydrogels, PDMS, and polyvinyl alcohol were successively filled into the fence, and ideal experimental results were obtained. This proof of the sensitizing concept provides a new application idea for improving the function of micro-devices on the fiber. © 1983-2012 IEEE.

关键词： Single mode fibers

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Predicted superconductivity above 100 K in electride Li4Rh under high pressure

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Physical Review Research 2025年第1期7卷 L012077-L012077页

作者： Zhiyao Guan Tian Cui Da Li State Key Laboratory of High Pressure and Superhard Materials and Key Laboratory of Material Simulation Methods & Software of Ministry of Education College of Physics Jilin University Changchun 130012 People's Republic of China School of Physical Science and Technology Ningbo University Ningbo 315211 People's Republic of China

Although numerous high-pressure electride (HPE) superconductors have been reported, their superconducting transition temperatures (Tc) are low. No HPE superconductor with a Tc exceeding 100 K has been reported. Herein, we predicted a HPE superconductor, Li4Rh, with a high Tc=108.2 K at 300 GPa, making it the first HPE superconductor with a Tc exceeding 100 K. Li4Rh features strong hybridization between nonnuclear attractors (NNAs) and atoms near the Fermi level and a large, deformed cylindrical Fermi sheet. This Fermi sheet structure induces strong electron-phonon coupling (EPC) and allows a broad range of electrons and phonons with a wide range of q vectors to participate in EPC, resulting in high Tc. Unlike other HPE superconductors, the Tc of Li4Rh does not decrease with decreasing EPC but remains stable because the logarithmic average phonon frequency increases as the EPC strength decreases. This helps maintain Tc with increasing pressure with little fluctuation. The results indicate that HPEs with strong hybridization between NNAs and atoms near the Fermi level and with large and closed Fermi surfaces are more likely to exhibit high Tc, offering deep insights into HPE superconductivity and providing valuable guidance for future research into high-Tc electrides.

关键词： Fermi level

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High Power,Compact Picosecond Pulse Compression Based on Concave-Convex Cavity

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Chinese physics Letters 2025年第2期42卷 67-71页

作者： Zhenwen Huang Pinbin Li Xiaowei Xing Qi Liu Kejian Wang Wenjun Liu Hao Teng Jiangfeng Zhu Zhiyi Wei State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China School of Optoelectronic Engineering Xidian UniversityXi’an 710071China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Laser Creation Optoelectronics Technology Company Limited Beijing 101400China Songshan Lake Materials Laboratory Dongguan 523808China

By combining a concave-convex multi-pass cavity with solid-state nonlinear media for spectral broadening and a post-compression grating setup,we generated femtosecond pulses with high peak power *** to the other traditional pulse compression technologies,the configuration is very compact with large tolerance for beam direction and spot *** pulses with an average power of 80 W,a pulse width of 10.7 ps,and a repetition rate of 500 kHz are compressed to 842 fs with the configuration,and the compressed pulse duration approaches the Fourier transform limited pulse duration of 707 fs.

关键词： repetition configuration Compact

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