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China Functional Material technology and Industry Forum, CFMTIF 2015

作者： Fu, Dong-Xing Liu, Jin-Na Liu, Er-Bao Cai, Zhao-Bin Cui, Xiu-Fang Jin, Guo GRIPM Advanced Materials Co. Ltd. General Research Institute for Nonferrous Metals Beijing101407 China Institute of Surface/Interface Science and Technology Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin150001 China

ISBN: (纸本)9783038357551

The interface properties of multi-layered functionally graded Cr3C2-NiCr coatings deposited by plasma spraying technique were experimentally studied in this paper. The microstructure and phase structure of coatings were studied with scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The thermal shock resistance was investigated by cyclic heating and cooling tests using an electro-calefaction furnace. The crack appearances of the coatings were observed carefully. Results show that the plasma sprayed multi-layered functionally graded coatings are compact and the adhesion between the layers and the substrate is good. The coatings have better macro-hardness than the substrate, and the 6-layers coating has the highest macro-hardness and the best wear resistance. Besides, the micro-hardness of coatings increases with increasing content of Cr2C3 in coating materials. Results of cyclic thermal shock show that the main failure styles of the coatings are crack and desquamation and the thermal shock resistance of the coatings is improved obviously by increasing the number of coating layers. © 2016 Trans Tech Publications, Switzerland.

关键词： Plasma spraying

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Anodic Hydrazine Oxidation Assists Energy‐Efficient Hydrogen Evolution over a Bifunctional Cobalt Perselenide Nanosheet Electrode

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Angewandte Chemie 2018年第26期130卷

作者： Jun‐Ye Zhang Hongming Wang Yifan Tian Ya Yan Qi Xue Ting He Hongfang Liu Chundong Wang Yu Chen Bao Yu Xia Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology (HUST) 1037 Luoyu Road Wuhan 430074 P. R. China Institute for Advanced Study Nanchang University 999 Xuefu Road Nanchang P. R. China School of Optical and Electronic Information Huazhong University of Science and Technology (HUST) 1037 Luoyu Road Wuhan 430074 P. R. China School of Materials Science & Engineering University of Shanghai for Science and Technology 516 Jungong Road Shanghai 200093 P. R. China Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry (MOE) Shaanxi Key Laboratory for Advanced Energy Devices School of Materials Science and Engineering Shaanxi Normal University 199 Chang'an Rd Xi'an 710062 P. R. China Shenzhen Institute of Huazhong University of Science and Technology 9 Yuexing Road Shenzhen 518000 P. R. China

Water electrolysis is a promising source of hydrogen; however, technological challenges remain. Intensive efforts have focused on developing highly efficient and earth‐abundant electrocatalysts for water splitting. An effective strategy is proposed, using a bifunctional tubular cobalt perselenide nanosheet electrode, in which the sluggish oxygen evolution reaction is substituted with anodic hydrazine oxidation so as to assist energy‐efficient hydrogen production. Specifically, this electrode produces a current density of 10 mA cm −2 at −84 mV for hydrogen evolution and −17 mV for hydrazine oxidation in 1.0 m KOH and 0.5 m hydrazine electrolyte. An ultralow cell voltage of only 164 mV is required to generate a current density of 10 mA cm −2 for 14 hours of stable water electrolysis.

关键词： Cobaltperselenide Difunktionale Elektrokatalysatoren Hydrazinoxidation Wasserstoffentwicklung

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Topological phase transition and interface states in hybrid plasmonic-photonic systems

arXiv

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arXiv 2017年

作者： Ge, Lixin Liu, Liang Xiao, Meng Du, Guiqiang Shi, Lei Han, Dezhuan Chan, C.T. Zi, Jian Department of Applied Physics Chongqing University Chongqing401331 China Department of Electrical Engineering Ginzton Laboratory Stanford University StanfordCA94305 United States School of Space Science and Physics Shandong University at Weihai Weihai264209 China Key Laboratory of Surface Physics Fudan University Shanghai200433 China Department of Physics and Institute for Advanced Study Hong Kong University of Science and Technology Hong Kong

The geometric phase and topological property for one-dimensional hybrid plasmonic-photonic crystals consisting of a simple lattice of graphene sheets are investigated systematically. For transverse magnetic waves, both plasmonic and photonic modes exist in the momentum space. The accidental degeneracy point of these two kinds of modes is identified to be a diabolic point accompanied with a topological phase transition. For a closed loop around this degeneracy point, the Berry phase is π as a consequence of the discontinuous jump of the geometric Zak phase. The wave impedance is calculated analytically for the semi-infinite system, and the corresponding topological interface states either start from or terminate at the degeneracy point. This type of localized interface states may find potential applications in photonics and plasmonics. Copyright © 2017, The Authors. All rights reserved.

关键词： Interface states

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Graphene Foams: A Bubble‐Derived Strategy to Prepare Multiple Graphene‐Based Porous Materials (Adv. Funct. Mater. 23/2018)

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advanced Functional Materials 2018年第23期28卷

作者： Rujing Zhang Ruirui Hu Xinming Li Zhen Zhen Zhenhua Xu Na Li Limin He Hongwei Zhu Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Department 5 P.O. Box 81‐5 AECC Beijing Institute of Aeronautical Materials Beijing 100095 China State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering and Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China International Center for Materials Nanoarchitectonics (WPI‐MANA) National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan

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Author Correction: Hotspots of biogeochemical activity linked to aridity and plant traits across global drylands

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Nature plants 2024年第5期10卷 829页

作者： David J Eldridge Jingyi Ding Josh Dorrough Manuel Delgado-Baquerizo Osvaldo Sala Nicolas Gross Yoann Le Bagousse-Pinguet Max Mallen-Cooper Hugo Saiz Sergio Asensio Victoria Ochoa Beatriz Gozalo Emilio Guirado Miguel García-Gómez Enrique Valencia Jaime Martínez-Valderrama César Plaza Mehdi Abedi Negar Ahmadian Rodrigo J Ahumada Julio M Alcántara Fateh Amghar Luísa Azevedo Farah Ben Salem Miguel Berdugo Niels Blaum Bazartseren Boldgiv Matthew Bowker Donaldo Bran Chongfeng Bu Rafaella Canessa Andrea P Castillo-Monroy Ignacio Castro Patricio Castro-Quezada Simone Cesarz Roukaya Chibani Abel Augusto Conceição Anthony Darrouzet-Nardi Yvonne C Davila Balázs Deák Paloma Díaz-Martínez David A Donoso Andrew David Dougill Jorge Durán Nico Eisenhauer Hamid Ejtehadi Carlos Ivan Espinosa Alex Fajardo Mohammad Farzam Ana Foronda Jorgelina Franzese Lauchlan H Fraser Juan Gaitán Katja Geissler Sofía Laura Gonzalez Elizabeth Gusman-Montalvan Rosa Mary Hernández Norbert Hölzel Frederic Mendes Hughes Oswaldo Jadan Anke Jentsch Mengchen Ju Kudzai F Kaseke Melanie Köbel Anika Lehmann Pierre Liancourt Anja Linstädter Michelle A Louw Quanhui Ma Mancha Mabaso Gillian Maggs-Kölling Thulani P Makhalanyane Oumarou Malam Issa Eugene Marais Mitchel McClaran Betty Mendoza Vincent Mokoka Juan P Mora Gerardo Moreno Seth Munson Alice Nunes Gabriel Oliva Gastón R Oñatibia Brooke Osborne Guadalupe Peter Margerie Pierre Yolanda Pueyo R Emiliano Quiroga Sasha Reed Ana Rey Pedro Rey Víctor Manuel Reyes Gómez Víctor Rolo Matthias C Rillig Peter C le Roux Jan Christian Ruppert Ayman Salah Phokgedi Julius Sebei Anarmaa Sharkhuu Ilan Stavi Colton Stephens Alberto L Teixido Andrew David Thomas Katja Tielbörger Silvia Torres Robles Samantha Travers Orsolya Valkó Liesbeth van den Brink Frederike Velbert Andreas von Heßberg Wanyoike Wamiti Deli Wang Lixin Wang Glenda M Wardle Laura Yahdjian Eli Zaady Yuanming Zhang Xiaobing Zhou Fernando T Maestre Centre for Ecosystem Science School of Biological Earth and Environmental Sciences University of New South Wales Sydney New South Wales Australia. State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical Science Beijing Normal University Beijing China. jingyiding@***. Department of Planning and Environment Merimbula New South Wales Australia. Fenner School of Environment & Society Australian National University Canberra Australian Capital Territory Australia. Laboratorio de Biodiversidad y Funcionamiento Ecosistémico Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS) CSIC Seville Spain. Schools of Life Sciences School of Sustainability and Global Drylands Center Arizona State University Tempe AZ USA. Université Clermont Auvergne INRAE VetAgro Sup Unité Mixte de Recherche Ecosystème Prairial Clermont-Ferrand France. Aix Marseille Univ CNRS Avignon Université IRD IMBE Aix-en-Provence France. Department of Forest Ecology and Management Swedish University of Agricultural Sciences (SLU) Umeå Sweden. Departamento de Ciencias Agrarias y Medio Natural Escuela Politécnica Superior Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA) Universidad de Zaragoza Huesca Spain. Instituto Multidisciplinar para el Estudio del Medio 'Ramón Margalef' Universidad de Alicante Alicante Spain. Instituto de Ciencias Agrarias Consejo Superior de Investigaciones Científicas Madrid Spain. Departamento de Ingeniería y Morfología del Terreno Escuela Técnica Superior de Ingenieros de Caminos Canales y Puertos Universidad Politécnica de Madrid Madrid Spain. Departmento de Biodiversidad Ecología y Evolución Facultad de Ciencias Biológicas Universidad Complutense de Madrid Madrid Spain. Estación Experimental de Zonas Áridas (EEZA) CSIC Campus UAL Almería Spain. Department of Range Management Faculty of Natural Resources and Marine Sciences Tarbiat Modares University Noor Iran. Instituto Nacional de T

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The effect of Cr and Zr content on the microstructure and properties of the Cu-Cr-Zr system alloy

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IOP Conference Series: Materials science and engineering 2018年第1期447卷

作者： E A Sarkeeva V D Sitdikov G I Raab W Wei I V Alexandrov Ufa State Aviation Technical University 12 K. Marx 450000 Ufa Russia School of Materials Science and Engineering Changzhou University 1 Gehu Road Changzhou 213164 P.R. China Jiangsu Key Laboratory of Materials Surface Science and Technology Changzhou University Changzhou 213164 P.R. China Joint Laboratory of Functional Nanostructured Metals Changzhou University Changzhou 213164 P.R. China

This article investigates the effect of various contents of Cr and Zr on the microstructure and properties of the alloy of the Cu-Cr-Zr system. It has been defined that an increase in the content of Zr leads to a decrease in the grain size both in the initial state and after severe plastic deformation. The increase in the content of Zr significantly enhances the strength of the alloy.

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Improper ferroelectricity at antiferromagnetic domain walls of perovskite oxides

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Physical Review B 2017年第10期96卷 104431-104431页

作者： Yali Yang Hongjun Xiang Hongjian Zhao Alessandro Stroppa Jincang Zhang Shixun Cao Jorge Íñiguez L. Bellaiche Wei Ren International Centre for Quantum and Molecular Structures Physics Department Shanghai University Shanghai 200444 China Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA Department of Physics Key Laboratory of Computational Physical Sciences (Ministry of Education) State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Materials Research and Technology Department Luxembourg Institute of Science and Technology (LIST) 5 avenue des Hauts-Fourneaux L-4362 Esch/Alzette Luxembourg CNR-SPIN Via Vetoio 67100 L’Aquila Italy Materials Genome Institute and Shanghai Key Laboratory of High Temperature Superconductors Shanghai University Shanghai 200444 China

First-principles calculations are performed on magnetic multidomain structures in the SmFeO3 rare-earth orthoferrite compound. We focus on the magnetic symmetry breaking at (001)-oriented antiphase domain walls, treating magnetism in the simplest (collinear) approximation without any relativistic (spin-orbit coupling) effects. We found that the number of FeO2 layers inside the domains determines the electrical nature of the whole system: multidomains with odd number of layers are paraelectric, while multidomains with even number of layers possess an electric polarization aligned along b axis and a resulting multiferroic Pmc21 ground state. Our ab initio data and model for ferroelectricity induced by spin order reveal that this polarization is of the improper type and originates from an exchange striction mechanism that drives a polar displacement of the oxygen ions located at the magnetic domain walls. Additional calculations ratify that this effect is general among magnetic perovskites with an orthorhombic SmFeO3−like structure.

关键词： Antiferromagnetism Domain walls Ferroelectric domains Ferroelectricity Multiferroics Noncentrosymmetric materials Oxides Perovskites Density functional calculations

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Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe2Ge2

arXiv

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arXiv 2018年

作者： Wo, Hongliang Wang, Qisi Shen, Yao Zhang, Xiaowen Hao, Yiqing Feng, Yu Shen, Shoudong He, Zheng Pan, Bingying Wang, Wenbin Nakajima, K. Ohira-Kawamura, S. Steffens, P. Boehm, M. Schmalzl, K. Forrest, T.R. Matsuda, M. Zhao, Yang Lynn, J.W. Yin, Zhiping Zhao, Jun State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Institute of Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Materials and Life Science Division J-PARC Center Tokai Ibaraki319-1195 Japan Institut Laue-Langevin 71 Avenue des Martyrs Grenoble Cedex 938042 France Forschungszentrum Jülich GmbH Jülich Centre for Neutron Science at ILL 71 Avenue des Martyrs Grenoble38000 France Diamond Light Source Harwell Campus DidcotOX11 0DE United Kingdom Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States NIST Center for Neutron Research National Institute of Standards and Technology GaithersburgMD20899 United States Department of Materials Science and Engineering University of Maryland College ParkMD20742 United States Department of Physics and Center for Advanced Quantum Studies Beijing Normal University Beijing100875 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

We report neutron scattering measurements of single-crystalline YFe2Ge2 in the normal state, which has the same crystal structure to the 122 family of iron pnictide superconductors. YFe2Ge2 does not exhibit long range magnetic order, but exhibits strong spin fluctuations. Like the iron pnictides, YFe2Ge2 displays anisotropic stripe-type antiferromagnetic spin fluctuations at (π, 0, π). More interesting, however, is the observation of strong spin fluctuations at the in-plane ferromagnetic wavevector (0, 0, π). These ferromagnetic spin fluctuations are isotropic in the (H, K) plane, whose intensity exceeds that of stripe spin fluctuations. Both the ferromagnetic and stripe spin fluctuations remain gapless down to the lowest measured energies. Our results naturally explain the absence of magnetic order in YFe2Ge2 and also imply that the ferromagnetic correlations may be a key ingredient for iron-based materials. Copyright © 2018, The Authors. All rights reserved.

关键词： Crystal structure

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Rules and mechanisms governing octahedral tilts in perovskites under pressure

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Physical Review B 2017年第5期96卷 054102-054102页

作者： H. J. Xiang Mael Guennou Jorge Íñiguez Jens Kreisel L. Bellaiche Key Laboratory of Computational Physical Sciences (Ministry of Education) State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 P. R. China Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 P. R. China Materials Research and Technology Department Luxembourg Institute of Science and Technology (LIST) 41 Rue du Brill L-4422 Belvaux Luxembourg Physics and Materials Science Research Unit University of Luxembourg 41 Rue du Brill L-4422 Belvaux Luxembourg

The rotation of octahedra (octahedral tilting) is common in ABO3 perovskites and relevant to many physical phenomena, ranging from electronic and magnetic properties, metal-insulator transitions to improper ferroelectricity. Hydrostatic pressure is an efficient way to tune and control octahedral tiltings. However, the pressure behavior of such tiltings can dramatically differ from one material to another, with the origins of such differences remaining controversial. In this paper, we discover several new mechanisms and formulate a set of simple rules that allow us to understand how pressure affects oxygen octahedral tiltings via the use and analysis of first-principles results for a variety of compounds. Besides the known A−O interactions, we reveal that the interactions between specific B ions and oxygen ions contribute to the tilting instability. We explain the previously reported trend that the derivative of the oxygen octahedral tilting with respect to pressure (dR/dP) usually decreases with both the tolerance factor and the ionization state of the A ion by illustrating the key role of A−O interactions and their change under pressure. Furthermore, three new mechanisms/rules are discovered, namely that (i) the octahedral rotations in ABO3 perovskites with empty low-lying d states on the B site are greatly enhanced by pressure, in order to lower the electronic kinetic energy; (ii) dR/dP is enhanced when the system possesses weak tilt instabilities, and (iii) for the most common phase exhibited by perovskites—the orthorhombic Pbnm state—the in-phase and antiphase octahedral rotations are not automatically both suppressed or both enhanced by the application of pressure because of a trilinear coupling between these two rotation types and an antipolar mode involving the A ions. We further predict that the polarization associated with the so-called hybrid improper ferroelectricity could be manipulated by hydrostatic pressure by indirectly controlling the amplitude of o

关键词： Ferroelectricity First-principles calculations Pressure effects Inorganic compounds Density functional theory Tight-binding model

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Possible structural origin of superconductivity in Sr-doped Bi2Se3

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Physical Review Materials 2018年第1期2卷 014201-014201页

作者： Zhuojun Li Meng Wang Dejiong Zhang Nan Feng Wenxiang Jiang Chaoqun Han Weijiong Chen Mao Ye Chunlei Gao Jinfeng Jia Jixue Li Shan Qiao Dong Qian Ben Xu He Tian Bo Gao CAS Center for Excellence in Superconducting Electronics (CENSE) Shanghai 200050 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China University of Chinese Academy of Sciences Beijing 100049 China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 People's Republic of China Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Doping bismuth selenide (Bi2Se3) with elements such as copper and strontium (Sr) can induce superconductivity, making the doped materials interesting candidates to explore potential topological superconducting behaviors. It was thought that the superconductivity of doped Bi2Se3 was induced by dopant atoms intercalated in van der Waals gaps. However, several experiments have shown that the intercalation of dopant atoms may not necessarily make doped Bi2Se3 superconducting. Thus, the structural origin of superconductivity in doped Bi2Se3 remains an open question. Herein, we combined material synthesis and characterization, high-resolution transmission electron microscopy, and first-principles calculations to study the doping structure of Sr-doped Bi2Se3. We found that the emergence of superconductivity is strongly related with n-type dopant atoms. Atomic-level energy-dispersive x-ray mapping revealed various n-type Sr dopants that occupy intercalated and interstitial positions. First-principles calculations showed that the formation energy of a specific interstitial Sr doping position depends strongly on the Sr doping level. This site changes from a metastable position at low Sr doping level to a stable position at high Sr doping level. The calculation results explain why quenching is necessary to obtain superconducting samples when the Sr doping level is low and also why slow furnace cooling can yield superconducting samples when the Sr doping level is high. Our findings suggest that Sr atoms doped at interstitial locations, instead of those intercalated in van der Waals gaps, are most likely to be responsible for the emergence of superconductivity in Sr-doped Bi2Se3.

关键词： Dopants Impurities in superconductors

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