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SSRN 2023年

作者： Lv, Jinjuan Wang, Shuai Liu, Xiao Wang, Guowei Zheng, Lei Zhao, Yunsong Zhao, Jingxuan Ge, Binghui Schmitz, Guido School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Institutes of Physical Science and Information Technology Anhui University Hefei230601 China National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing100095 China Institute of Materials Science University of Stuttgart Heisenbergstraße 3 StuttgartD-70569 Germany

During the creep deformation, damage mainly occurs in the tertiary creep stage. Thus, creep life is essentially controlled by the tertiary stage. To find out the impact of the dislocation microstructure on the creep rate in this stage, and in particular its thickness-dependence, creep tests of Ni-based single crystal superalloy are carried out at 1100 °C/130 MPa with sheet samples of varying thickness. The creep rate in tertiary creep clearly increases and rises faster in thinner sample sheets. The observed microstructures demonstrate that the γ/γ' phase distribution shows no topological inversion. It is found that the variety of dislocations in γ' rafts decrease with decreasing sample thickness. The γ' rafts in thin samples are sheared by only two types of superdislocation involving individual screw superdislocations and double Lomer-Cottrell structures, while the γ' rafts in thick samples are sheared by three types of superdislocations, again individual screw superdislocations and double Lomer-Cottrell structures, but also Kear-Wilsdorf structures. Also the density of disclocations varies significantly. A higher density of individual screw superdislocations and of mobile dislocation pairs, but lower density of locked non-planar structures promotes the creep of thinner samples. © 2023, The Authors. All rights reserved.

关键词： Creep

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Highly stable and efficient perovskite solar cells produced via high-boiling point solvents and additive engineering synergistically

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Science China Chemistry 2020年第6期63卷 818-826页

作者： Qingbo Wei Zhangwen Ye Xiaodong Ren Feng Fu Zhou Yang Shengzhong(Frank)Liu Dong Yang Key Laboratory of Applied Surface and Colloid Chemistry of the Ministry of Education Shaanxi Engineering Lab for Advanced Energy TechnologySchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'an 710062China Key Laboratory of Chemical Reaction Engineering of Shaanxi Province College of Chemistry&Chemical EngineeringYan'an UniversityYan'an 716000China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Materials Science and Engineering Penn StateUniversity ParkPA16802USA

The active absorber layer plays a crucial role in a perovskite solar ***,we used high boiling pointγ-butyrolactone(GBL)as the main solvent,Pb(SCN)2 and dimethyl sulfoxide(DMSO)as an effective additive in the FA0.83MA0.17Cs0.05PbI(3-x)Brx solution to improve the quality of perovskite *** GBL will delay the crystallization speed of the perovskite,and lead to the grain growth assisted by *** synergistic effect of the solvent engineering and additive engineering is beneficial to the slow growth of the grain *** is found that the addition of Pb(SCN)2 increases Gibbs free energy barrier for the nucleation,leading to the formation of fewer nuclei,which results in a high quality of perovskite absorbers with larger grains and smoother *** synergistic effect of solvents and Pb(SCN)2 on the morphology and photovoltaic performances is *** to devices without the additive,the efficiency of devices with 5%Pb(SCN)2-doped FA0.83MA0.17Cs0.05PbI(3-x)Brx is raised to 19.01%from 15.21%.We believe this breakthrough regarding high efficiency perovskite solar cells will help for their transitions.

关键词： perovskite additive crystallinity grain size efficiency

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Flexible Diodes/Transistors Based on Tunable p-n-Type Semiconductivity in Graphene/Mn-Co-Ni-O Nanocomposites

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Research 2021年第1期2021卷 986-993页

作者： Lihong Su Zhou Yang Xitong Wang Ziao Zou Bo Wang Gary Hodes Ninghui Chang Yongyong Suo Zhibo Ma Haoxu Wang Yucheng Liu Junping Zhang Shuanhu Wang Yuefei Li Fengxia Yang Jixin Zhu Fei Gao Wei Huang Shengzhong Liu School of Chemistry and Chemical-Engineering Northwestern Polytechnical UniversityXi’an710129 ShaanxiChina Dongguan Sanhang Civil-Military Integration Innovation Institute Dongguan52300 GuangdongChina Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China School of Aeronautics Northwestern Polytechnical UniversityXi’an710072 ShaanxiChina Department of Materials and Interfaces Weizmann Institute of ScienceRehovot 76100Israel Key Lab of Micro/Nano Systems for Aerospace Ministry of EducationNorthwestern Polytechnical UniversityXi’an710129 ShaanxiChina University of Queensland Australian Institute for Bioengineering&NanotechnologyNanomaterials CentreSt.LuciaQldAustralia School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an710129 ShaanxiChina Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an710129 ShaanxiChina

We report a novel Mn-Co-Ni-O(MCN)nanocomposite in which the p-type semiconductivity of Mn-Co-Ni-O can be manipulated by addition of *** an increase of graphene content,the semiconductivity of the nanocomposite can be tuned from p-type through electrically neutral to *** very low effective mass of electrons in graphene facilitates electron tunneling into the MCN,neutralizing holes in the MCN *** analysis shows that the multivalent manganese ions in the MCN nanoparticles are chemically reduced by the graphene electrons to lower-valent *** traditional semiconductor devices,electrons are excited from the filled graphite band into the empty band at the Dirac points from where they move freely in the graphene and tunnel into the *** new composite film demonstrates inherent flexibility,high mobility,short carrier lifetime,and high carrier *** work is useful not only in manufacturing flexible transistors,FETs,and thermosensitive and thermoelectric devices with unique properties but also in providing a new method for future development of 2D-based semiconductors.

关键词： neutral conductivity lifetime

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Controlling angular dispersions in optical metasurfaces

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Light(Science & Applications) 2020年第1期9卷 1286-1297页

作者： Xiyue Zhang Qi Li Feifei Liu Meng Qiu Shulin Sun Qiong He Lei Zhou State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200438China Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing Green Photonics and Department of Optical Science and EngineeringFudan UniversityShanghai 200433China Academy for Engineering and Technology Fudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

Although metasurfaces have shown great potential for manipulating light,most previously realized meta-devices suffer from uncontrolled angular dispersions,making them unfavorable for many ***,we propose a general strategy to realize optical metasurfaces with desired angular dispersions based on carefully controlling both the near-field couplings between meta-atoms and the radiation pattern of a single *** such a strategy,we experimentally demonstrate a series of optical meta-devices with predesigned angular dispersions,including two incident-angle-insensitive absorbers,one incident-angle-selective absorber,and one multifunctional meta-polarizer whose functionality changes from a perfect mirror to a half-waveplate as the excitation angle ***,we design a gradient meta-device using meta-atom arrays with purposely controlled angular dispersions and numerically demonstrate that it can exhibit distinct wavefront-control functionalities when illuminated at different incident *** findings establish a new platform for achieving angle-multiplexed functional meta-devices,significantly expanding the wave-manipulation capabilities of optical metasurfaces.

关键词： angular dispersion absorber

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Chlorine-modified SnO2 electron transport layer for high-efficiency perovskite solar cells

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InfoMat 2020年第2期2卷 401-408页

作者： Xiaodong Ren Yucheng Liu Dong Geon Lee Won Bin Kim Gill Sang Han Hyun Suk Jung Shengzhong(Frank)Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an710119China School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwonKorea Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023ChinaUniversity of the Chinese Academy of SciencesBeijing100039China

A high-quality electron transport layer(ETL)is a critical component for the realization of high-efficiency perovskite solar *** developed a controllable direct-contact reaction process to prepare a chlorinated SnO2(SnO2-Cl)*** is unique in that(a)102-dichlorobenzene is used to provide more reactive Cl radicals for more in-depth passivation;(b)it does not introduce any impurities other than *** is found that the chlorine modification significantly improves the electron ***,its associated solar cell efficiency is increased from 17.01%to 17.81%comparing to the pristine SnO2 ETL without the *** hysteresis index is significantly reduced to 0.017 for the SnO2-Cl ETL.

关键词： chlorine-modified SnO2 electron transport layer perovskite solar cell surface passivation

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Possible gapless quantum spin liquid behavior in the triangular-lattice Ising antiferromagnet PrMgAl11O19

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Physical Review B 2024年第16期109卷 165143-165143页

作者： Zhen Ma Shuhan Zheng Yingqi Chen Ruokai Xu Zhao-Yang Dong Jinghui Wang Hong Du Jan Peter Embs Shuaiwei Li Yao Li Yongjun Zhang Meifeng Liu Ruidan Zhong Jun-Ming Liu Jinsheng Wen Hubei Key Laboratory of Photoelectric Materials and Devices School of Materials Science and Engineering Hubei Normal University Huangshi 435002 China State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Department of Applied Physics Nanjing University of Science and Technology Nanjing 210094 China ShanghaiTech Laboratory for Topological Physics and School of Physical Science and Technology ShanghaiTech University Shanghai 200031 China Tsung-Dao Lee Institute & School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Laboratory for Neutron Scattering and Imaging Paul Scherrer Institut 5232 Villigen Switzerland National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

Quantum spin liquids (QSLs) represent a novel state where spins are highly entangled but do not order even at zero temperature due to strong quantum fluctuations. Such a state is mostly studied in Heisenberg models defined on geometrically frustrated lattices. Here, we turn to a new triangular-lattice antiferromagnet PrMgAl11O19, in which the interactions are believed to be of Ising type. Magnetic susceptibility measured with an external field along the c axis is two orders of magnitude larger than that with a field in the ab plane, displaying an ideal easy-axis behavior. Meanwhile, there is no magnetic phase transition or spin freezing observed down to 1.8 K. Ultralow-temperature specific heat measured down to 50 mK does not capture any phase transition either, but a hump at 4.5 K, below which the magnetic specific heat exhibits a quasiquadratic temperature dependence that is consistent with a Dirac QSL state. The inelastic neutron scattering technique is also employed to elucidate the nature of its ground state. In the magnetic excitation spectra, there is a gapless broad continuum at the base temperature 55 mK, in favor of the realization of a gapless QSL. Our results provide a scarce example for the QSL behaviors observed in an Ising-type magnet, which can serve as a promising platform for future research on QSL physics based on an Ising model.

关键词： Frustrated magnetism Magnetic anisotropy Magnetism Quantum spin liquid Spin-orbit coupling Spinon Antiferromagnets Inelastic neutron scattering Specific heat measurements Susceptibility measurements

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Crystal-plane effects of anatase TiO₂ on the selective hydrogenation of crotonaldehyde over Ir/TiO₂ catalysts

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Journal of Catalysis 2021年 395卷 10-22页

作者： Jia, Aiping Zhang, Yunshang Song, Tongyang Zhang, Zhenhua Tang, Cen Hu, Yiming Zheng, Wanbin Luo, Mengfei Lu, Jiqing Huang, Weixin Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 China Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China Dalian National Laboratory for Clean Energy Dalian 116023 China

Supported Ir/TiO2 catalysts with the anatase TiO2 nanocrystals exposing {1 0 1}, {1 0 0} and {0 0 1} planes were tested for selective hydrogenation of crotonaldehyde. The Ir/TiO2-{1 0 1} catalyst dominantly exposing {... 详细信息

Supported Ir/TiO₂ catalysts with the anatase TiO₂ nanocrystals exposing {1 0 1}, {1 0 0} and {0 0 1} planes were tested for selective hydrogenation of crotonaldehyde. The Ir/TiO₂-{1 0 1} catalyst dominantly exposing {1 0 1} plane gave a initial reaction rate of 166.1 μmol g_Ir^-1 s⁻¹ at 80 °C and a turnover frequency of crotyl alcohol formation of 0.022 s⁻¹, which is 5 and 7 times respectively higher than those obtained on the Ir/TiO₂-{0 0 1} catalyst dominantly exposing {0 0 1} plane even though they have similar Ir particle sizes (ca. 1.3 nm). The reaction behaviors were related to the surface oxygen vacancy, which served as surface acid sites and provide adsorption sites for C[dbnd]O bond in the CRAL molecule. Therefore, the higher concentration of oxygen vacancy in the Ir/TiO₂-{1 0 1} accounted for the improved performance compared to the Ir/TiO₂-{0 0 1}. However, strong adsorption of crotonaldehyde and/or products on the catalyst surface, as well as the CO poisoning via decarbonylation of crotonaldehyde, were the main reasons for the catalyst deactivation. © 2020 Elsevier Inc.

关键词： Crystal plane effect Defects Hydrogenation Ir/TiO2 Reaction mechanism α, β - unsaturated aldehyde

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Effect of Heat Treatment on Microstructure and Properties of Al0.5cocrfeni High Entropy Alloy Fabricated by Selective Laser Melting

SSRN

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SSRN 2023年

作者： Du, Yuhui Guo, Chunhuan Jiang, Fengchun Li, Yanchun Sun, Xiaojing Sun, Qianfei Zhang, Hexin Dong, Tao Konovalov, Sergey Key Laboratory of Superlight Materials & Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China Yantai Research Institute Graduate School of Harbin Engineering University Yantai264006 China Institute of Advanced Technology Heilongjiang Academy of Sciences Harbin150020 China Research Centre for Laser Extreme Manufacturing Chinese Academy of Sciences Ningbo Institute of Materials Technology and Engineering Ningbo315201 China

In this study, heat treatment as a post processing was used in order to improve the microstructures and mechanical properties of Al0.5CoCrFeNi high entropy alloy (HEA), which fabricated by selective laser melting (SLM). Compared to the microstructure of SLM-ed Al0.5CoCrFeNi HEA, the strengthening the weakening mechanisms of HEA at different heat treatment temperatures are figured out. Heated at 1073 K for 4 hours, the SLM-ed Al0.5CoCrFeNi HEA shows the highest tensile strength. With increasing heat treatment temperature from 1073K to 1673K, both the dislocation density in Al0.5CoCrFeNi HEA and the content of the precipitated phase decrease, while the size of the precipitated phase increases. Moreover, dislocation network disappearance and recrystallization occur at 1173 K and 1373 K, respectively. The boundaries of the dislocation network, as the nucleation sites of precipitation, promote the formation of precipitation phases and form dislocation network wrapped by precipitation phases at 1073 K, which significantly improves the tensile strength of HEA. The low dislocation density in the recrystallized grains change the morphology of the precipitation phases, and the aspect ratio of the precipitation phases increases, which made the HEA still maintain a certain tensile strength at 1673K. © 2023, The Authors. All rights reserved.

关键词： High-entropy alloys

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Revelation of New Magnetic Domain Wall Category and Spin-Density-Wave Boundary State in Itinerant Magnet

arXiv

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arXiv 2024年

作者： Hu, Yining Wang, Xu Chen, Chen Zhang, Qingle Zhao, Dongming Zhang, Tianzhen Wang, Chenxi Wang, Qiang-Hua Feng, Donglai Zhang, Tong Department of Physics State Key Laboratory of Surface Physics and Advanced Material Laboratory Fudan University Shanghai200438 China New Cornerstone Laboratory National Synchrotron Radiation Laboratory School of Nuclear Science and Technology University of Science and Technology of China Hefei230027 China National Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing210093 China Collaborative Innovation Center for Advanced Microstructures Nanjing210093 China Hefei National Laboratory Hefei230088 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Zhejiang Institute of Photoelectronics Zhejiang Institute for Advanced Light Source Zhejiang Normal University Jinhua321004 China Interdisciplinary Materials Research Center School of Materials Science and Engineering Tongji University Shanghai201804 China

Conventional magnetic domain walls are typically characterized by reorientation of local moments. However, what occurs at the boundary of itinerant magnets is largely unknown. Here using spin-sensitive scanning tunneling microscopy, we investigated the microscopic boundaries of spin-density-wave (SDW) state in a prototypical itinerant antiferromagnet-chromium (Cr). At the boundary of two incommensurate SDW domains, we observed that the spins undergo finite-scale decay rather than reorientation, which generated a double-Q SDW state accompanied by a second-order charge modulation. In the commensurate SDW domains, a clear SDW energy gap is observed. The screw dislocations induced "half" vortex and anti-vortex of SDW, paired by antiphase domain wall. We find the spin density vanished at such antiphase domain walls;while for the first time, we observed intriguing SDW in-gap states at the boundary, resembling the Andreev bound states in superconductors. These unique SDW boundary structures can be viewed as consequences of local interference of two SDWs, either with different Q or reversed phases. Our findings thus reveal a new category of magnetic domain wall-the "interference wall", with a mechanism rooted in itinerant nature of the system. © 2024, CC BY.

关键词： Screw dislocations

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Evaluating the Deformation Modulus at Representative Elementary Volume Using Electrical Resistivity Tomography

SSRN

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SSRN 2023年

作者： Akbariforouz, Mohammadreza Zhao, Qi Zheng, Chunmiao EIT Institute for Advanced Study Ningbo China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China

The deformation modulus of rock mass is essential for evaluating deformations and the bearing capacity of rock masses. This modulus obtained by conventional approaches, including empirical equations and in-situ tests, cannot be considered a parameter at representative elementary volume (EREV) due to limited coverage of the test area and difficulties in conducting the tests in harsh geological or topographic conditions. This study employs electrical resistivity (ER) tomography and numerical back-analysis to investigate the EREV at the Beheshtabad dam site in Iran. Geoelectrical contrasts were used to detect proper locations for installing extensometers. The deformations recorded by extensometers at excavated galleries were used to back-calculate the EREV values by numerical modeling. The deformation modulus values were evaluated by empirical equations and in-situ tests and compared to EREV values based on the developed method. A correlation was established between ER and EREV and was used to calculate EREV values at the dam axis;the results are 30 to 80% more accurate comparing the conventional approaches. Tested area, anisotropy, and plastic deformations are significant factors that can influence EREV values. Our methodology provides a systematical approach to establishing an ER-EREV relationship for evaluating rock mass deformation modulus at REV, which can be applied to rock engineering sites with harsh geology or limited access without exposing an extreme financial burden or environmental issues. © 2023, The Authors. All rights reserved.

关键词： Rocks

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