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Compositional complexity dependence of dislocation density and mechanical properties in high entropy alloy systems

Progress in Natural science:materials International 2020年第4期30卷 545-551页

作者： P.Thirathipviwat G.Song J.Bednarcik U.Kühn T.Gemming K.Nielsch J.Han Leibniz Institute of Solid State and Materials Research (IFW Dresden) Frontier Research Center for Applied Atomic Sciences Ibaraki University Division of Advanced Materials Engineering and Institute for rare metals Kongju National University Institute of Physic Pavol Jozef Safarik University in Ko?ice Deutsches Elektronen-Synchrotron (DESY) Institute of Materials Science Technische Universit?t Dresden Institute of Applied Physics Technische Universit?t Dresden Korea Institute for Rare Metals Korea Institute of Industrial Technology (KITECH)

This study focuses on a quantitative analysis of dislocation accumulation after cold plastic deformation and mechanical properties of Fe Ni Co Cr Mn and Ti Nb Hf Ta Zr high entropy alloys(HEAs) which are single phase fcc and bcc solid solutions, respectively. In order to study the role of compositional complexity from unary to quinary compositions on dislocation accumulation and mechanical properties after plastic deformation, the single solid solution phase forming sub-alloys of the two HEAs were investigated. All studied samples revealed a large plastic deformability under cold-rotary swaging process by 85–90% area reduction without intermediate annealing. The dislocation density of all studied samples, determined by Williamson-Hall method on synchrotron X-ray diffraction patterns, were between 1014-1015m-2dependent on the alloy composition. The level of dislocation density after plastic deformation is not only affected by the number of constituent element but the lattice distortion and intrinsic properties in terms of stacking fault energy, modulus misfit, and melting point also impact the dislocation storage. The level of dislocation density determines the level of mechanical properties because of a resistance to dislocation motions. The hardness and yield compressive strength of the studied samples are proportional to the level of dislocation density.

关键词： High entropy alloys Dislocation density Synchrotron XRD Mechanical properties

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Palladium nanoplates scotch breast cancer lung metastasis by constraining epithelial-mesenchymal transition

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National science Review 2021年第7期8卷 124-136页

作者： Shunhao Wang Jingchao Li Mei Chen Liting Ren Wenya Feng Lining Xu Xiaolan Chen Tian Xia Nanfeng Zheng Sijin Liu State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials Department of Chemistry Xiamen University College of Materials Science and Engineering Hunan University Division of Nanomedicine Department of Medicine California Nano Systems Institute University of CaliforniaLos Angeles

Metastasis accounts for the majority of cancer deaths in many tumor types including breast ***-mesenchymal transition(EMT) is the driving force for the occurrence and progression of metastasis, however, no targeted strategies to block the EMT program are currently available to combat metastasis. Diverse engineered nanomaterials(ENMs) have been reported to exert promising anti-cancer effects, however, no ENMs have been designed to target EMT. Palladium(Pd) nanomaterials, a type of ENM, have received substantial attention in nanomedicine due to their favorable photothermal performance for cancer therapeutics. Herein, Pd nanoplates(Pd PL) were found to be preferentially biodistributed to both primary tumors and metastatic tumors. Importantly, Pd PL showed a significant inhibition of lung metastasis with and without near-infrared(NIR) irradiation. Mechanistic investigations revealed that EMT was significantly compromised in breast cancer cells upon the Pd PL treatment, which was partially due to the inhibition of the transforming growth factor-beta(TGF-β) signaling. Strikingly, the Pd PL was found to directly interact with TGF-β proteins to diminish TGF-β functions in activating its downstream signaling, as evidenced by the reduced phosphorylation of Smad2. Notably,TGF-β-independent pathways were also involved in undermining EMT and other important biological processes that are necessary for metastasis. Additionally, NIR irradiation elicited synergistic effects on PdPL-induced inhibition of primary tumors and metastasis. In summary, these results revealed that the Pd PL remarkably curbed metastasis by inhibiting EMT signaling, thereby indicating the promising potential of Pd PL as a therapeutic agent for treating breast cancer metastasis.

关键词： palladium nanoplates tumor targeting lung metastasis epithelial-mesenchymal transition TGF-β

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Defect-induced helicity-dependent terahertz emission in Dirac semimetal PtTe2 thin films

arXiv

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arXiv 2023年

作者： Chen, Zhongqiang Qiu, Hongsong Cheng, Xinjuan Cui, Jizhe Jin, Zuanming Tian, Da Zhang, Xu Xu, Kankan Liu, Ruxin Niu, Wei Zhou, Liqi Qiu, Tianyu Chen, Yequan Zhang, Caihong Xi, Xiaoxiang Song, Fengqi Yu, Rong Zhai, Xuechao Jin, Biaobing Zhang, Rong Wang, Xuefeng Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials State Key Laboratory of Spintronics Devices and Technologies School of Electronic Science and Engineering Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Research Institute of Superconductor Electronics School of Electronic Science and Engineering MOE Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances Nanjing University Nanjing210093 China Department of Applied Physics MIIT Key Laboratory of Semiconductor Microstructures and Quantum Sensing Nanjing University of Science and Technology Nanjing210094 China School of Materials Science and Engineering Tsinghua University Beijing100084 China Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation Center University of Shanghai for Science and Technology Shanghai200093 China College of Engineering and Applied Sciences Nanjing University Nanjing210093 China State Key Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing210093 China Purple Mountain Laboratories Nanjing211111 China Department of Physics Xiamen University Xiamen361005 China

Nonlinear transport enabled by symmetry breaking in quantum materials has aroused considerable interest in condensed matter physics and interdisciplinary electronics. However, the nonlinear optical response in centrosymmetric Dirac semimetals via the defect engineering has remained highly challenging. Here, we observe the helicity-dependent terahertz (THz) emission in Dirac semimetal PtTe2 thin films via circular photogalvanic effect (CPGE) under normal incidence. This is activated by artificially controllable out-of-plane Te-vacancy defect gradient, which is unambiguously evidenced by the electron ptychography. The defect gradient lowers the symmetry, which not only induces the band spin splitting, but also generates the giant Berry curvature dipole (BCD) responsible for the CPGE. Such BCD-induced helicity-dependent THz emission can be manipulated by the Te-vacancy defect concentration. Furthermore, temperature evolution of the THz emission features the minimum of the THz amplitude due to the carrier compensation. Our work provides a universal strategy for symmetry breaking in centrosymmetric Dirac materials for efficient nonlinear transport and facilitates the promising device applications in integrated optoelectronics and spintronics. © 2023, CC BY.

关键词： Thin films

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Quantum microwave photonics in radio-over-fiber systems

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Photonics research 2022年第7期10卷 1669-1678页

作者： YAQING JIN YE YANG HUIBO HONG XIAO XIANG RUNAI QUAN TAO LIU SHOUGANG ZHANG NINGHUA ZHU MING LI RUIFANG DONG Key Laboratory of Time and Frequency Primary Standards National Time Service CenterChinese Academy of SciencesXi’an 710600China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China The 29th Research Institute of China Electronics Technology Group Corporation Chengdu 610029China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100190China

As the main branch of microwave photonics,radio-over-fiber technology provides high bandwidth,low-loss,and long-distance propagation capability,facilitating wide applications ranging from telecommunication to wireless *** ultrashort pulses as the optical carrier,a large capacity is further ***,the wide bandwidth of ultrashort pulses results in the severe vulnerability of high-frequency radio frequency(RF)signals to fiber *** a time-energy entangled biphoton source as the optical carrier combined with the singlephoton detection technique,a quantum microwave photonics method in radio-over-fiber systems is proposed and demonstrated *** results show that it not only realizes unprecedented nonlocal RF signal modulation with strong resistance to the dispersion but also provides an alternative mechanism to distill the RF signal out from the dispersion ***,the spurious-free dynamic ranges of the nonlocally modulated and distilled RF signals have been significantly *** the ultra-weak detection and the high-speed processing advantages endowed by the low-timing-jitter single-photon detection,the quantum microwave photonics method opens new possibilities in modern communication and networks.

关键词： fiber ultrashort microwave

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Polarization Dynamics of Passively Mode-Locked Vertical External-Cavity Surface-Emitting Laser

Polarization Dynamics of Passively Mode-Locked Vertical Exte...

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Bragg Gratings, Photosensitivity and Poling in Glass Waveguides and materials, BGPP 2022

作者： Castillo-Pinto, Camila Broda, Artur Muszalski, Jan Song, Yufeng Zhang, Han Panajotov, Krassimir B-PHOT Brussels Photonics Vrije Universiteit Brussel Pleinlaan 2 Brussels1050 Belgium Lukasiewicz Research Network - Institute of Microelectronics and Photonics Al. Lotników 32/46 Warsaw02-668 Poland Intelligent Internet of Things and Intelligent Manufacturing Center College of Electronics and Information Engineering Shenzhen University Shenzhen518060 China Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics Collaborative Innovation Center for Optoelectronic Science and Technology Institute of Microscale Optoelectronics Shenzhen University Shenzhen518060 China Georgi Nadjakov Institute of Solid State Physics Bulgarian Academy of Sciences 72 Tzarigradsko Chaussee Sofia1784 Bulgaria

ISBN: (纸本)9781957171166

We investigate experimentally polarization dynamics of passively mode-locked VECSEL. We demonstrate that the normalized Stokes parameters and degree of polarization are functions of time reaching extreme values at the pulse peaks. Our experiments show that light has vertical, 45° polarization components, and a small amount of circular polarization. © 2022 The Author(s).

关键词： Polarization

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Quantum Criticality in YbCu4Ni

arXiv

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arXiv 2023年

作者： Osato, Kotaro Taniguchi, Takanori Okabe, Hirotaka Kitazawa, Takafumi Kawamata, Masahiro Hongfei, Zhao Ikeda, Yoichi Nambu, Yusuke Sari, Dita Puspita Watanabe, Isao Nakamura, Jumpei G. Koda, Akihiro Gouchi, Jun Uwatoko, Yoshiya Fujita, Masaki Institute for Materials Research Tohoku University Katahira Sendai980-8577 Japan Department of Physics Tohoku University Aoba Sendai980-8578 Japan Organization for Advanced Studies Tohoku University Sendai980-8577 Japan FOREST Japan Science and Technology Agency Saitama Kawaguchi332-0012 Japan Innovative Global Program College of Engineering Shibaura Institute of Technology Saitama337-8570 Japan Meson Science Laboratory Nishina Center for Accelerator-Based Science RIKEN Saitama Wako351-0198 Japan Institute of Materials Structure Science High Energy Accelerator Research Organization Ibaraki Tsukuba305-0801 Japan The Institute for Solid State Physics University of Tokyo Chiba Kashiwa277-8581 Japan

We report on the quantum criticality of YbCu4Ni as revealed by our combined micro- and macro-measurements. We determine the crystal structure of YbCu4Ni with site mixing by neutron diffraction measurements, which suggests the possible presence of Kondo disorder. However, decreasing the local spin susceptibility distribution and the development of spin fluctuations below 10 K at ambient pressure by muon spin rotation and relaxation measurements suggests that YbCu4Ni exhibits quantum criticality. Therefore, our experimental results indicate that YbCu4Ni is a new material that exhibits quantum criticality under a zero magnetic field and ambient pressure. © 2023, CC BY.

关键词： Criticality (nuclear fission)

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Enhanced thermoelectric properties of the topological phase of monolayer HfC

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Chinese Physics B 2025年第5期 553-562页

作者：母文来穆罕默德·尼萨董宝娟阮俊兴郭怀红斋藤理一郎公卫江杨腾张志东 Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of SciencesSchool of Materials Science and Engineering University of Science and Technology of China Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics University of Science and Technology of China Liaoning Academy of Materials State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University Collaborative Innovation Center of Extreme Optics Shanxi University Frontier Research Institute for Interdisciplinary Sciences Tohoku University College of Sciences Liaoning Petrochemical University Department of Physics Tohoku University College of Sciences Northeastern University

Thermoelectric properties of a topological insulator, monolayer Hf C, are calculated using first-principles calculation,which accounts for the two contributions from edge and bulk states. By applying strain up to 8% along the a axis, the monolayer Hf C shows the topological phase while it is in a non-topological state without strain. The figure of merit, ZT,for the topological phase becomes two-ordered magnitude larger(ZT ～ 2) because of larger electric conductivity than that of the non-topological phase due to edge current. The total Seebeck coefficient S, and ZT have maximum values when the chemical potential is located at the highest energy of the edge state. The peak of ZT comes from the fact that the product of divergent S and quickly-decreasing electric conductivity above the highest energy of the edge state. We further optimize S and ZT by changing the sample size and temperature.

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Microdomain atomic structure of Zr_(50)Pd_(40)Al_(10) metallic glasses and its formation mechanism

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Journal of materials science & Technology 2019年第3期35卷 248-253页

作者： Kai Li Fangliang Gao Yu-Jen Chou Kaixiang Shen Guoqiang Li State Key Laboratory of Luminescent Materials and Devices South China University of Technology Engineering Research Center on Solid-State Lighting and Its Informationisation of Guangdong Province South China University of Technology Department of Electronic Materials School of Materials Science and Engineering South China University of Technology School of Physics and Telecommunications Engineering South China Normal University

Zr-based Zr_50Pd_40Al_10 metallic glasses has not only crystalline phases of about 5 nm in diameter but also amorphous phases. In this work, the radial distribution functions(RDFs) of amorphous structure of Zr_50Pd_40Al_10 metallic glasses were firstly measured by electron diffraction, and then Reverse Monte Carlo(RMC) optimization accompanied by density functional theory(DFT) calculations. The amorphous structure has not only short-range order but also good medium-range order. In the RDFs of its amorphous structure, the first and the second peaks are located at 2.96 ? and 4.79 ?, respectively. Partial radical distribution functions(PRDFs) show that the contributions of the first and the second nearest-neighbor distances of various atom pairs to the G(r) peak values, and the first nearest-neighbor distances of Pd–Zr and Zr–Zr atom pairs are the sources of main G(r) peak values between 2? and 6?. The competition mechanism for generating the Pd_25Zr_55 Al_20 amorphous phase and the intermetallic crystalline phase Pd_11Zr_9 is associated with the differences of atomic radius, the proportion, and the melting point of different atoms, as well as the heat of mixing between atoms, leading to an equilibrium state of the two phases. Accordingly, a composite system with intertwined nanocrystals and amorphous phases is in turn formed, and improves the stability of the material.

关键词： Metallic glasses Radial distribution function Electron diffraction Density functional theory Formation mechanism

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Experimental demonstration of skyrmionic magnetic tunnel junction at room temperature

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science Bulletin 2022年第7期67卷 691-699页

作者： Sai Li Ao Du Yadong Wang Xinran Wang Xueying Zhang Houyi Cheng Wenlong Cai Shiyang Lu Kaihua Cao Biao Pan Na Lei Wang Kang Junming Liu Albert Fert Zhipeng Hou Weisheng Zhao Fert Beijing Institute MIIT Key Laboratory of SpintronicsSchool of Integrated Circuit Science and EngineeringBeihang UniversityBeijing 100191China Shenyuan Honors College Beihang UniversityBeijing 100191China Beihang-Geortek Joint Microelectronics Institute Qingdao Research InstituteBeihang UniversityQingdao 266104China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute for Advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 211102China

Chiral magnetic skyrmions are topological swirling spin textures that hold promise for future information technology. The electrical nucleation and motion of skyrmions have been experimentally demonstrated in the last decade, while electrical detection compatible with semiconductor processes has not been achieved, and this is considered one of the most crucial gaps regarding the use of skyrmions in real applications. Here, we report the direct observation of nanoscale skyrmions in Co Fe B/Mg O-based magnetic tunnel junction devices at room temperature. High-resolution magnetic force microscopy imaging and tunneling magnetoresistance measurements are used to illustrate the electrical detection of skyrmions,which are stabilized under the cooperation of interfacial Dzyaloshinskii–Moriya interaction, perpendicular magnetic anisotropy, and dipolar stray field. This skyrmionic magnetic tunnel junction shows a stable nonlinear multilevel resistance thanks to its topological nature and tunable density of skyrmions under current pulse excitation. These features provide important perspectives for spintronics to realize highdensity memory and neuromorphic computing.

关键词： Topological spin texture Magnetic skyrmion Nanodevice High-density memory Neuromorphic computing

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Rare earth elements in sands collected from Southern California sea beaches

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Chemosphere 2023年 344卷 140254页

作者： Saha, Biraj Eliason, Kira Golui, Debasis Masud, Jahangir Bezbaruah, Achintya N. Iskander, Syeed Md Department of Civil Construction and Environmental Engineering North Dakota State University FargoND58102 United States Department of Soil Science and Agricultural Chemistry ICAR-Indian Agricultural Research Institute Pusa Campus New Delhi110 012 India Energy and Environmental Research Center University of North Dakota Grand ForksND58202 United States Materials and Nanotechnology Program North Dakota State University FargoND58108 United States Environmental and Conservation Sciences North Dakota State University FargoND58108 United States

Rare earth elements (REEs) are considered the limiting resources for advancing clean technologies and electronics. Because global REEs reserve is limited, non-conventional and secondary sources are being investigated for recovery. Here, we investigated wet and dry sand from seven Southern California beaches for sixteen REEs. These include five light REEs, two medium REEs, and nine heavy REEs, separated by their atomic weight. The mass of the magnetically separated compounds ranged from 15.19 to 129.91 g per kg of dry sand in the studied sea beaches in Southern California. The total REEs concentration ranged from 1168.1 to 6816.7 μg per kg of wet sand (dry sand basis) and 1474.7–7483.8 μg per kg of dry sand. Cerium (Ce) and Yttrium (Y) were the most prevalent REEs in these beaches ranging from 387.4 to 2241.1 μg kg−1 and 104.5–2302.3 μg kg−1 of sand respectively. This study found light REEs concentration accounted for 70–80% of total rare earth elements in the studied beaches. The concentrations of the analyzed REEs were significantly different (p © 2023 Elsevier Ltd

关键词： Rare earth elements

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