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Effect of order–disorder transition on thermodynamic and electronic properties of σ and χ phases in W–Re alloy: the first-principles calculation

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Tungsten 2025年第1期7卷 195-213页

作者： Zhi-Peng Zhu Dian Jia William Yi Wang Jun-Lei Yin Xing-Yu Gao Shu-Feng Yang Hai-Feng Song Jin-Shan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The Tungsten-Rhenium(W-Re) alloys,celebrated for their high melting point,strength at elevated temperatures,electrical resistivity,and radiation resistance,have been widely utilized in high-temperature components,aerospace,electronics,and nuclear *** constituents of the topologically close-packed(TCP) phases,the sigma phase(σ) and chi phase(χ) formed within W-Re alloys wield considerable influence on the mechanical properties and the stability of the *** calculations were utilized in the present work to explore the structural,thermodynamic,and electronic properties of both ordered and disordered configurations within the σ and χ phases,culminating in a systematic elucidation of the higher phase stability exhibited by the ordered *** is found that the bulk modulus of these two phases is directly proportional to the concentration of Re in the alloy,while the equilibrium volume is inversely *** thermodynamic parameters of the σ and χ phases are calculated via the mean-field potential *** similar trends observed in the isobaric heat capacity,enthalpy increment,and entropy change curves for these two phases suggest they possess comparable thermodynamic *** is noteworthy that the contribution of ionic vibrations predominantly affects the isobaric heat capacity,while the contribution of thermal electronic excitations increases linearly with *** the structure and thermodynamic properties of TCP phases in W-Re alloys at low temperatures has profound significance for optimizing material performance,microstructures features,establishing theoretical foundations,and predicting material behavior.

关键词： First-principles calculations Phase stability Thermodynamic properties W-Re alloy TCP phases

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Scanning tunneling microscopy study on symmetry breaking of charge density wave in FeGe

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Chinese physics B 2025年第4期34卷 55-61页

作者： Jiakang Zhang Ziyuan Chen Xueliang Wu Mingzhe Li Yuanji Li Ruotong Yin Jiashuo Gong Shiyuan Wang Aifeng Wang Dong-Lai Feng Ya-Jun Yan School of Emerging Technology and Department of Physics University of Science and Technology of ChinaHefei 230026China Low temperature Physics Laboratory College of Physics and Center of Quantum Materials and DevicesChongqing UniversityChongqing 401331China National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology New Cornerstone Science LaboratoryUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China

The complex symmetry breaking states in AV3Sb5 family have attracted extreme research attention,but controversy still exists,especially in the question of time reversal symmetry breaking of the charge density wave(CDW).Most recently,a chiral CDW has been suggested in kagome magnet FeGe,but the related study is very ***,we use a scanning tunneling microscope to study the symmetry breaking behavior of both the short-and long-range CDWs in *** from previous studies,our study reveals an isotropic long-range CDW without obvious symmetry breaking,while local rotational symmetry breaking appears in the short-range CDW,which may be related to the existence of strong structural ***,the charge distribution of the short-range CDW is inert to the applied external magnetic fields and the detailed spin arrangements of FeGe,inconsistent with the expectation of a chiral CDW associated with chiral *** results rule out the existence of spontaneous chiral and rotational symmetry breaking in the CDW state of FeGe,putting strong constraints on the further understanding of CDW mechanism.

关键词： symmetry breaking kagome magnet charge density wave

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Kinetics of Rayleigh-Taylor instability in van der Waals fluid:the influence of compressibility

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Frontiers of physics 2025年第1期20卷 269-297页

作者： Jie Chen Aiguo Xu Yudong Zhang Dawei Chen Zhihua Chen National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsP.O.Box 8009-26Beijing 100088China State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of TechnologyBeijing 100081China HEDPS Center for Applied Physics and Technologyand College of EngineeringPeking UniversityBeijing 100871China National Key Laboratory of Shock Wave and Detonation Physics Mianyang 621999China School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China

Early studies on Rayleigh−Taylor instability(RTI)primarily relied on the Navier−Stokes(NS)*** research progresses,it becomes increasingly evident that the kinetic information that the NS model failed to capture is of great value for identifying and even controlling the RTI process;simultaneously,the lack of analysis techniques for complex physical fields results in a significant waste of data *** addition,early RTI studies mainly focused on the incompressible case and the weakly compressible *** the case of strong compressibility,the density of the fluid from the upper layer(originally heavy fluid)may become smaller than that of the surrounding(originally light)fluid,thus invalidating the early method of distinguishing light and heavy fluids based on *** this paper,tracer particles are incorporated into a single-fluid discrete Boltzmann method(DBM)model that considers the van der Waals *** using tracer particles to label the matter-particle sources,a careful study of the matter-mixing and energy-mixing processes of the RTI evolution is realized in the single-fluid *** effects of compressibility on the evolution of RTI are examined mainly through the analysis of bubble and spike velocities,the ratio of area occupied by heavy fluid,and various entropy generation rates of the *** is demonstrated that:(i)compressibility has a suppressive effect on the spike velocity,and this suppressive impact diminishes as the Atwood number(At)*** influence of compressibility on bubble velocity shows a staged behavior with increasing.(ii)The impact of compressibility on the entropy production rate associated with the heat flow(S_(NOEF))is related to the stages of RTI ***,this staged impact of compressibility on S_(NOEF)varies with *** exhibits an inhibitory effect on the entropy production rate associated with viscous stresses(S_(NOEF)).(iii)By incorporating the morphological parameter of the pr

关键词： discrete Boltzmann method Rayleigh-Taylor instability compressibility effect tracer particles

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Experimental realization of Wheeler's delayed-choice experiment with dual selections

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science China(physics,Mechanics & Astronomy) 2025年第5期Mechanics & Astronomy) .卷 48-54页

作者： Xiaowan Yang Xinglei Yu Liangsheng Li Xinzhi Zhao Tianle Zheng Chengjie Zhang Chuan-Feng Li Guang-Can Guo School of Physical Science and Technology Ningbo University National Key Laboratory of Scattering and Radiation Hefei National Laboratory University of Science and Technology of China CAS Key Laboratory of Quantum Information University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China

Wheeler's delayed-choice experiment demonstrates wave-particle duality of particles using different experimental configurations of a Mach-Zehnder interferometer. In a quantum version of this experiment, the wave-particle behaviour of photons can be observed by controlling presence or absence of the second beam splitter. Here, we implement a delayed-choice experiment with dual selections based on entangled photons, experimentally controlling both of two beam splitters in the Mach-Zehnder interferometer, where the presence and absence of the second beam splitter are simultaneously controlled through path encoding. Our experiment reveals the wave-particle behavior of single photons under different configurations of two beam splitters. We further discuss the scenario when two beam splitters are in a quantum superposition of being present and absent, photons will be in a wave-particle quantum superposition state.

关键词： delayed choice quantum entanglement wave-particle duality

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Electronic thermal conductivity of tungsten-based systems during collision cascade processes

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Nuclear science and Techniques 2025年第5期36卷 167-176页

作者： Jiong-Rong Wang Bi-Cai Pan Key Laboratory of Strongly-Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230026China

The thermal conductivity of plasma-facing materials(PFM)exposed to intense radiation is a critical concern for the reliable usage of materials in fusion ***,limited research has been performed regarding the thermal conductivity of structures that rapidly change in a short time during collision cascade processes under *** this study,we employed the tight-binding(TB)method to investigate the electronic thermal conductivity(κ_(e))of tungsten-based systems during various cascading *** found thatκ_(e) values sharply decrease within the initial 0.3 picoseconds and then partially recover at a slow pace;this is closely linked to the evolution of defects and microstructural *** increase in the initial kinetic energy of the primary knock-on atom and the presence of a high concentration of hydrogen atoms further decrease theκ_(e) ***,higher temperatures have a significant positive effect onκ_(e).Furthermore,the presence of a grain boundary∑5[001](130)substantially reducesκ_(e),whereas the absorption effect of point defects by the grain boundary has little influence onκ_(e) during *** findings provide a theoretical basis for evaluating changes in the thermal conductivity performance of PFMs during their usage in nuclear fusion reactors.

关键词： Electronic thermal conductivity Collision cascade Tungsten Plasma-facing materials Tight-binding calculations

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A novel Li-ion based transistor within LiCoO2/Li6.75La3Zr1.5Ta0.5O12/Ag scheme

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Progress in Natural science:Materials International 2025年第1期35卷 194-200页

作者： Jixiang Yin Houning Song Peirong Li Yuzhi Xing Supeng Chen Qi Liang Yu Feng Dong Yang Wenxiao Zhao Dong Wang Qinghao Li Pengfei Yu Qiang Li Xiaosong Liu Yanxue Chen College of Physics Qingdao University School of Physics State Key Laboratory of Crystal Materials Shandong University Center for Transformative Science ShanghaiTech University National Synchrotron Radiation Laboratory University of Science and Technology of China

Traditional electronic devices are reaching their physical limits as they shrink in size to improve integration. Solid ionic devices have become promising candidate to avoid tunneling effect and address these constraints, but the response time are typically sluggish. In recent years, the rapid development of solid electrolyte and solid-state battery provide superior choices to overcome limitations in ion transport. In this work, we construct an ionic transistor within Ag/LiCoO2/Li6.75La3Zr1.5Ta0.5O12（LLZTO）/Ag structure. LiCoO2serves as the channel layer of the transistor, with LLZTO acting as the electrolyte to isolate electrons and facilitate ion conduction, and Ag as the gate/anode. XRD, Raman spectroscopy, and electrochemical characterization confirm lithiation and *** characterization demonstrates the continuous resistive switching of the LiCoO2channel layer between high and low resistive states under pulsed gate voltage control, exhibiting high reversibility and long cycle stability. By combining X-ray absorption spectroscopy（XAS） and X-ray emission spectroscopy（XES）, the transition between high and low resistive states can be well clarified by a first-order Mott transition scheme. These results provide new perspectives for performance improvement and further development of ionic devices.

关键词： Electrolytes Ionic conductivity Phase transitions Transistors X-ray spectroscopy

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Revealing the thermal stability of sodium-ion battery from material to cell level using combined thermal-gas analysis

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Journal of Energy Chemistry 2025年第4期103卷 838-849页

作者： Anqi Teng Yue Zhang Lihua Jiang Yue Zhang Hongbin Dang Chenchen Wang Zheng Fang Yong Liu Xuefeng Wang Huang Li Wenxin Mei Qingsong Wang State Key Laboratory of Fire Science University of Science and Technology of China College of Safety and Environmental Engineering Shandong University of Science and Technology Anhui Provincial Emergency Management Research Institute Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

The future large-scale application of sodium-ion batteries（SIBs） is inseparable from their excellent electrochemical performance and reliable safety *** present,there are few studies focusing on their safety *** analysis of thermal stability and structural changes within a single material cannot systematically describe the complex interplay of components within the battery system during the thermal runaway ***,the reaction between the battery materials themselves and their counterparts within the system can stimulate more intense exothermic behavior,thereby affecting the safety of the entire battery ***,this study delved into the thermal generation and gas evolution characteristics of the positive electrode(NaxNi1/3Fe1/3Mn1/3O2,NFM111) and the negative electrode（hard carbon,HC） in SIBs,utilizing various material *** the integration of microscopic and macroscopic characterization techniques,the underlying reaction mechanisms of the positive and negative electrode materials within the battery during the heating process were *** important results are derived from this study:（Ⅰ） The instability of the solid electrolyte interphase（SEI） leads to its decomposition at temperatures below 100℃,followed by extensive decomposition within the range of 100-150 ℃,yielding heat and the formation of inorganic compounds,such as Na2CO3and Na2O;（Ⅱ） The reaction between NFM111 and the electrolyte constitutes the primary exothermic event during thermal abuse,with a discernible reaction also occurring between sodium metal and the electrolyte throughout the heating process;（Ⅲ） The heat production and gas generation behaviors of multi-component reactions do not exhibit complete correlation,and the occurrence of gas production does not necessarily coincide with thermal *** results presented in this study can provide useful guidance for the safety improvement of SIBs.

关键词： Decomposition Gas generation Sodium-ion battery safety Thermal stability

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Evaluation and Suppression of Vibrational Noise for Cryogenic Surface Electrode Ion Traps

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Chinese physics Letters 2025年第3期42卷 52-62页

作者： Qingqing Qin Baoquan Ou Wei Wu Yi Xie Ting Chen Chunwang Wu Pingxing Chen Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Mechanism and Technology of Quantum Information Changsha 410073China Department of Physics College of ScienceNational University of Defense TechnologyChangsha 410073China

Cryogenic ion traps offer substantial advantages over their room-temperature counterparts,particularly in terms of stable ion confinement and ***,this technological advancement has introduced a significant challenge,namely the generation of additional vibrational *** noise is pronounced during the compression and expansion phases of the Gifford–McMahon cycle refrigerator and stems from the mechanical operation of the cold *** residual vibrational noise can modulate the Rabi oscillation frequency,thereby compromising the fidelity of the quantum logic *** this study,we quantitatively assess the impact of residual vibrational noise and introduce an innovative strategy for its *** strategy was designed to reduce superimposed potential fluctuations within a cryogenic surface electrode ion *** measured residual vibrational noise was used for real-time feedback *** the inverse determination of the compensating potential for a stable superimposed trapping potential is an inherently ill-posed problem considering known measurement noise *** applying quadratic programming,we numerically calculated the optimal time series for the compensation *** ensemble of these compensation voltages was applied in real time to the static compensation *** this method is in the theoretical stage,we believe that it can effectively suppress the translation induced by vibrational noise and foster the creation of a stable superimposed harmonic *** deployment of this technique is expected to substantially improve the accuracy of quantum operations,thereby fueling the evolution of quantum technologies.

关键词： vibrational thereby quantum

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Study, development and related application of a miniature compact pulsed power supply with high repetition frequency

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Defence technology 2025年 47卷 304-318页

作者： Wang, Zhangfei Liu, Jian Yang, Chunxia Li, Baoming National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China

Capacitor-based pulsed power supply (PPS) is widely used in fields related to electromagnetic launch, plasma, and materials' synthesis, modification and processing. As industrial applications place higher requirements on compact and portable pulsed power supplies, the national Key laboratory of Transient physics (NKLTP) recently developed a pulsed power supply consisting of a set of compact pulse-forming units (PFU), each with a capacitor energy storage of 220 kJ. This integrated PPS comes with a complete system configuration, a miniature compact structure, a high rate of repetition, and high power, with energy storage density exceeding 1.2 MJ/m3. This paper describes the device-level design of the unit, the system layout, the control system, the thermal management system, and the experimental results of the pulsed power supply. The experimental results verified the good reliability of the PPS at high repetition rates with each unit module delivering an output current of more than 100 kA. Additionally, flexible current pulse shapes can be formed by setting the charging voltage and the trigger sequence of the PFUs. The pulse forming network (PFN) developed from these PFUs was successfully applied to electromagnetic launch. © 2025 China Ordnance Society

关键词： Rail guns

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Efficient large-area flexible organic photovoltaic modules on transparent thin silver electrodes

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science China Chemistry 2025年第3期68卷 1199-1206页

作者： Cong Xie Zedong Xiong Xinlu Liu Wen Wang Yang Liu Xueshi Jiang Xin Lu Lulu Sun Yinhua Zhou Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Kunming Institute of Physics Kunming 650221China

Large-area flexible organic photovoltaic(OPV)modules are challenging to achieve high power conversion efficiency(PCE).Electrical shunts or shortages generally occur in large-area OPV modules due to the ultrathin(100-200 nm)and soft active *** the surface smoothness of bottom transparent electrode will be able to suppress the shunts and *** this work,we report a method to fabricate smooth and flexible transparent electrodes based on thin silver film,and further to fabricate efficient large-area flexible OPV *** fabricated thin silver transparent electrodes simultaneously have high conductivity,high optical transmittance,good mechanical flexibility and low surface *** exposure(h.e.)treatment on MoO_(3)effectively facilitates the continuous growth of the thin transparent silver electrode.6 nm silver film on MoO_(3)(h.e.)on plastic substrate shows a transmittance up to 89%,a sheet resistance of 15Ω/sq,and a low surface roughness with a rootmean-square value of 0.276 ***,52-cm^(2)flexible organic solar modules(15 subcells)showed a certified PCE of 12.66%.Furthermore,a 1350 cm^(2)flexible component assembled by 25 pieces of 52-55 cm^(2)modules showed certified PCE of 12.10%with an open-circuit voltage of 62.85 V.

关键词： flexible organic photovoltaic modules flexible transparent electrode silver transparent electrode growth template low surface roughness

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