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The thermal stability of Er2O3 anti-reflective films deposited on CVD diamond by magnetron sputtering

Ceramics International 2025年第13期51卷 17568-17574页

作者： Huang, Yabo Zhao, Xia Zhu, Xiaohua Liu, Shengji Wang, Xulei Yue, Yuehan Sun, Weishuai Wang, Pei Guo, Xiaoqin Li, Chengming Henan Key Laboratory of Aeronautical Materials and Application Technologies Zhengzhou University of Aeronautics School of Materials Science and Engineering Henan Zhengzhou450046 China Beijing Institute of Metrology Beijing100029 China SF Diamond Co. LTD Zhengzhou450016 China Henan Key Laboratory of High Performance Carbon Fiber Reinforced Composites Institute of Carbon Matrix Composites Henan Academy of Sciences Zhengzhou450046 China Institute for Advanced Materials and Technology State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China

Erbium oxide (Er2O3) films with excellent thermal and optical performance are essential for application as heat-resistant and anti-reflective (AR) materials in chemical vapor deposition (CVD) diamond infrared windows. In this study, the thermal stability of Er2O3 AR films was investigated by heat treatment. The phase composition, microstructure, thermogravimetric analysis, mechanical properties, and infrared (IR) transmission performances of the Er2O3 AR films were thoroughly investigated. The results show that the cubic (222) plane orientation of the Er2O3 AR films after heat treatment was preferential to that at room temperature. No significant change was observed in the DSC and TG curve at the temperature varied, but the DSC curve of the Er2O3 AR films revealed two distinct stages at 502 °C and 798 °C owing to the formation of Er2O3 (420) and (134) planes. Specifically, the phase structure remained unchanged by high-resolution transmission electron microscope (HRTEM) observation, and the peak at 578.4 cm−1 was the only obvious impurity peak in the Raman spectrum owing to the introduction of the Er–O bond. Additionally, significant shedding of the Er2O3 AR films on the surface of the CVD diamond occurred at high temperatures. The grain size and roughness increased as the temperature increased, adversely affecting the continuous abrasion resistance of the Er2O3 AR films. Moreover, the Er2O3 AR films exhibited outstanding mechanical and optical properties at 800 °C, achieving a depth of only 0.65 μm and a maximum transmittance increased from 65 % of diamond to 76 %. This study provides valuable insights into the thermal stability of the Er2O3 AR films under high temperature application scenarios. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Oxide films

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In-situ growth of titanium alkoxide network encapsulated perovskite nanograin for robust light emission

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Nano Research 2025年第4期18卷 435-442页

作者： Si Peng Yunlong Liu Ying Liu Hao Wang Mingyu Ma Wenjia Zhou Ruiqi Xu Xianyuan Jiang Danni Yu Wei Zhou Yingbo Zhao Zhijun Ning School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)Shanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China State Key Laboratory of Advanced Medical Materials and Devices ShanghaiTech UniversityShanghai 201210China

The construction of a thin stable shell to encapsulate perovskite with effective carrier transport is a promising strategy to fabricate highly efficient and stable perovskite based optoelectronic ***,it is generally difficult to control the thickness and location of the encapsulating materials,ideally on perovskite *** this work,we developed a one-step method for the growth of titanium alkoxide networks in-situ in perovskite film forming an encapsulating layer on perovskite nanograin *** thin encapsulating network brings much enhanced stability and allows effective carrier transport *** emitting diode based on this composite shows much enhanced stability under continuous operation.

关键词： perovskite light-emitting diodes metal organic framework titanium-oxo cluster

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Mechanical property improving in ultrasonic assisted brazing SiCp/6061Al MMCs by an additional ultrasonic treatment 5

Mechanical property improving in ultrasonic assisted brazing...

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2024 5th International Conference on advanced Materials and Intelligent Manufacturing, ICAMIM 2024

作者： Ma, Lin Zhang, Shufan Lu, Kaicheng Zhu, Chao Xu, Zhiwu School of Material Science and Engineering Shenyang Aerospace University Shenyang110036 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China

To meet the welding requirements of SiCp/6061Al metal-matrix composites (MMCs), this paper proposed an additional ultrasonic treatment (AUT) based on traditional ultrasonic-assisted brazing. The shear strength of SiCp/6061Al MMCs brazed joints was effectively improved by a secondary ultrasonic treatment using Sn-Zn solder. Compared with the conventional ultrasonic treatment (43.84 MPa), the strength of the AUT welded joint was increased by 20 MPa, as high as 64.17 MPa. Moreover, through the analysis of the microstructure and fracture structure, the microstructure formation process of the weld during the AUT was found and expressed. 2025 Published under licence by IOP Publishing Ltd.

关键词： Metallic matrix composites

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Wavelength-tunable, mid-infrared ultrafast pulse generation through Raman self-frequency shift in an all-solid fluorotellurite fiber

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Optics Letters 2025年第8期50卷 2586-2589页

作者： Sun, Weiyi Jiao, Yadong Huang, Jiapeng Jia, Zhixu Chen, Liming Huang, Zhiyuan Jiang, Xin Leng, Yuxin Qin, Guanshi Pang, Meng Russell Centre for Advanced Lightwave Science Hangzhou Institute of Optics and Fine Mechanics Shanghai Institute of Optics and Fine Mechanics Hangzhou311421 China Shanghai201800 China School of Physical Science and Technology Shanghai Tech University Shanghai200031 China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun130012 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

We report a mid-infrared (mid-IR) fiber laser system that can deliver ultrafast soliton-like pulses with a wavelength tunable from 2.8 to 4.0 μm. The pump light source of the system is a mid-IR fiber laser mode-locked at 2.8 μm, which has an average output power of ∼500mW, a repetition rate of ∼30 MHz, a pulse energy of ∼15 nJ, and a pulse duration of ∼150 fs. The pump light was then launched into a short (∼70 cm) sample of fluorotellurite (TeO2-BaF2-Y2O3) glass fiber as the high-nonlinearity waveguide with simultaneously good features of large Raman gain, tailored dispersion, and high-power capability. High-efficiency Raman soliton self-frequency-shift phenomenon can be obtained in this short fiber sample, leading to the generation of broadband tunable (3-4 μm), mid-IR pulses with hundreds-of-fs pulse duration and tens-of-mW average power, corresponding to a pulse energy level of ∼1 nJ. The frequency-conversion efficiency inside the nonlinear fiber was measured to be as high as ∼16%. The present system, combining the advanced techniques of fluorotellurite fiber fabrication and mid-IR ultrafast fiber laser, highlights its application potentials for generating low-noise, high-beam-quality, mid-IR ultrafast pulses with a compact fiber configuration. © 2025 Optica Publishing Group.

关键词： Fiber lasers

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Adaptive restart scheme for HVDC transmission system based on voltage injection

Adaptive restart scheme for HVDC transmission system based o...

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18th International Conference on Developments in Power System Protection (DPSP APAC 2025)

作者： Ruizhi Ma Yu Chen Minghao Wen Ke Han State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 People's Republic of China

ISBN: (数字)9781837242900

Rapid restarting of high-voltage DC transmission system after a fault is crucial for the stable and reliable operation of the system. Conventional restart methods have the disadvantages of blindness, long restart process, and high restart failure rate. Restarting on permanent fault will cause more impact on the system or lead to system shutdown. To solve this problem, this paper proposes an adaptive restart scheme based on voltage injection. First, a fault property identification mode based on open-loop voltage control and closed-loop current control is proposed to be incorporated into the LCC control system. Secondly, the change rule of line voltage and current in the fault identification stage is analyzed based on the equivalent circuit diagram of the system under temporary and permanent faults. Finally, an adaptive restart scheme for HVDC transmission system based on voltage injection is proposed. The proposed scheme realizes the injection of voltage signals into the system after fault isolation while limiting the system current, which improves the safety of the system during fault restart. The proposed scheme can be realized based on the existing control system without additional equipment. The scheme has good noise and interference immunity, and its realization has a low sampling rate requirement, which has a good prospect for engineering applications. An electromagnetic transient model of the LCC-HVDC transmission system is constructed in PSCAD/EMTDC based on the engineering parameters, and simulations are carried out for verification. The simulation results show that the proposed scheme can correctly recognize the property of faults and can realize the restart of the system after the fault.

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Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO_(2)

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing Chen Chao Wu Xiaoling Liu Biao Meng Tao Chen Yu Han Jun Wang Shibo Xi Yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816JiangsuChina Advanced Membranes and Porous Materials Center Physical Sciences and Engineering DivisionKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia Institute of Sustainability for Chemicals Energy and EnvironmentA*STAR(Agency for ScienceTechnology and Research)Jurong IslandSingapore 627833Singapore College of Materials Science and Engineering Sichuan UniversityChengdu 610065SichuanChina

The synergy of single atoms(SAs)and nanoparticles(NPs)has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction(CO_(2)RR);however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly(ionic liquids)(PIL)precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO_(2)into *** Ni K-edge X-ray absorption near-edge structure(XANES)spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO_(2),the coexistence of Ni SAs and NPs strengthened the CO_(2)activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO_(2)→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Single atom catalyst Synergy effect cO2 reduction Carbon catalyst Electrocatalysis

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Combined anisotropic and cyclic constitutive model for laser powder bed fusion fabricated aluminum alloy

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Chinese Journal of Aeronautics 2025年第1期38卷 165-184页

作者： Fei-Fan LI Jihong ZHU Weihong ZHANG Shifeng WEN Jingwen SONG Jun MA Gang FANG State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi'an 710072China Department of Mechanical and Industrial Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

This study presents new methods to effectively model the anisotropic yielding and hardening behavior of laser powder bed fusion fabricated aluminum alloy under both monotonic and cyclic loading *** proposed model combines the yield surface-interpolation method to accurately describe the anisotropic hardening rates in various directions,with the Chaboche kinematic hardening rule to precisely reflect the cyclic *** numerical implementation of the combined anisotropic and cyclic constitutive model,a fully implicit stress integration algorithm based on return mapping method is ***,the multiple parameters associated with the model are categorized and identified in an uncoupled *** isotropic and cyclic hardening parameters are determined by an inverse method,and the stability of the optimization outcomes is validated by applying different starting points for the ***,the back-stress effect on the identification of anisotropic parameters associated with the stress invariant-based Hill48 yield function is considered for the first *** consideration leads to an improved prediction accuracy compared to the identification of anisotropic parameters without considering back-stress *** combined anisotropic and cyclic constitutive model,along with the calibrated parameters,are proven capable of accurately reproducing the intricate deformation behavior of laser powder bed fusion fabricated AlSi10Mg.

关键词： Constitutive models Anisotropy Kinematic hardening Laser powder bed fusion Aluminum alloys

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Observation of tunable exceptional points in a non-Hermitian acoustic system

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Science China(Physics,Mechanics & Astronomy) 2025年第5期68卷 143-150页

作者： Chen Liu Zhongming Gu Haixiao Zhang Xiaowei Zhang Chuanhao Ge Tuo Liu Jie Zhu Institute of Acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China School of Physics MOE Key Laboratory of Modern AcousticsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Electrical and Information Engineering Changzhou Institute of TechnologyChangzhou 213032China Key Laboratory of Speech Acoustics and Content Understanding Institute of AcousticsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China 7. Key Laboratory of Noise and Vibration Research Institute of AcousticsChinese Academy of SciencesBeijing 100190China

Exceptional points(EPs)have extensive and important applications in many wave-based technologies,such as ultra-sensitive sensing,unidirectional scattering and low-threshold ***,most of the previous EP-related wave phenomena are demonstrated in systems with fixed configuration,thereby extremely constraining their adaptability and reconfigurability in ***,we introduce a flexible approach to tuning EPs in an acoustic system with sandwich structures.A rotatable component,associated with an alterable gradient index,is clamped by a pair of lossy acoustic *** derivations and numerical simulations validate the capabilities of the model in continuously regulating EPs in the parameter space,with ingenious experimental setups confirming these *** results showcase the system's effectiveness in achieving unidirectional reflectionless wave propagation across various *** research reveals a flexible approach to linking the adjustment of EPs to a simple structural parameter,offering a robust framework for exploring and implementing non-Hermitian wave phenomena in practical scenarios.

关键词： asymmetric reflection tunable exceptional points non-Hermitian acoustic system

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Probing Interfacial Nanostructures of Electrochemical Energy Storage Systems by In-Situ Transmission Electron Microscopy

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Nano-Micro Letters 2025年第1期17卷 1-29页

作者： Liang, Guisheng Zhang, Chang Yang, Liting Liu, Yihao Liu, Minmin Xiong, Xuhui Yang, Chendi Lv, Xiaowei You, Wenbin Pei, Ke Zhong, Chuan-Jian Cheng, Han-Wen Che, Renchao Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Department of Materials Science Academy for Engineering and Technology Fudan University Shanghai200438 China Department of Chemistry State University of New York at Binghamton BinghamtonNY13902 United States

The ability to control the electrode interfaces in an electrochemical energy storage system is essential for achieving the desired electrochemical performance. However, achieving this ability requires an in-depth understanding of the detailed interfacial nanostructures of the electrode under electrochemical operating conditions. In-situ transmission electron microscopy (TEM) is one of the most powerful techniques for revealing electrochemical energy storage mechanisms with high spatiotemporal resolution and high sensitivity in complex electrochemical environments. These attributes play a unique role in understanding how ion transport inside electrode nanomaterials and across interfaces under the dynamic conditions within working batteries. This review aims to gain an in-depth insight into the latest developments of in-situ TEM imaging techniques for probing the interfacial nanostructures of electrochemical energy storage systems, including atomic-scale structural imaging, strain field imaging, electron holography, and integrated differential phase contrast imaging. Significant examples will be described to highlight the fundamental understanding of atomic-scale and nanoscale mechanisms from employing state-of-the-art imaging techniques to visualize structural evolution, ionic valence state changes, and strain mapping, ion transport dynamics. The review concludes by providing a perspective discussion of future directions of the development and application of in-situ TEM techniques in the field of electrochemical energy storage systems. (Figure presented.) © The Author(s) 2025.

关键词： Nanocomposites

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Design and Dynamic Experiment of Al-Cu Graded Materials Impactor with Strain Rate of 10^(4)–10^(5)/s

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稀有金属材料与工程 2025年第3期54卷 581-586页

作者： Hu Jianian Zhou Zizheng Li Yidi Chen Xiang Yang Gang Liu Jintao Zhang Jian State Key Laboratory of Precision Blasting Jianghan UniversityWuhan 430056China Hubei Key Laboratory of Blasting Engineering Jianghan UniversityWuhan 430056China Luoyang Ship Material Research Institute Luoyang 471023China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Based on simplified calculations of one-dimensional wave systems,loading pressure platform curves of Al-Cu gradient materials(GMs)impactor were *** Al-Cu GMs were prepared using tape-pressing sintering,and their acoustic properties were characterized to match the design *** parallelism of the Al-Cu GM was confirmed using a three-dimensional surface profilometry machine.A one-stage light-gas gun was used to launch the Al-Cu GM,impacting an Al-LiF target at a velocity of 400 m/*** results of the experimental strain rate demonstrate that the Al-Cu GMs can realize the precise control of the strain rate within the range of 10^(4)‒10^(5)/s in the high-speed impact experiments.

关键词： high strain rate Al-Cu graded materials impactor acoustic impedance gas gun experiment

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