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Incommensurate magnetic orders and topological Hall effect in the square-net centrosymmetric EuGa2Al2 system

Physical Review materials 2022年第7期6卷 074201-074201页

作者： Jaime M. Moya Shiming Lei Eleanor M. Clements Caitlin S. Kengle Stella Sun Kevin Allen Qizhi Li Y. Y. Peng Ali A. Husain Matteo Mitrano Matthew J. Krogstad Raymond Osborn Anand B. Puthirath Songxue Chi L. Debeer-Schmitt J. Gaudet P. Abbamonte Jeffrey W. Lynn E. Morosan Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston Texas 77005 USA Department of Physics and Astronomy Rice University Houston Texas 77005 USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA International Center for Quantum Materials School of Physics Peking University CN-100871 Beijing China Department of Physics and Astronomy and Quantum Matter Institute University of British Columbia Vancouver British Columbia Canada V6T 1Z1 Department of Physics Harvard University Cambridge Massachusetts 02138 USA Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA Department of Materials Science and NanoEngineering Rice University Houston Texas 77005 USA Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Materials Science and Engineering University of Maryland College Park Maryland 20742-2215 USA

Neutron diffraction on the centrosymmetric square-net magnet EuGa2Al2 reveals multiple incommensurate magnetic states (AFM1, 2, 3) in zero field. In applied field, a new magnetic phase (A) is identified from magnetization and transport measurements, bounded by two of the μ0H=0 incommensurate magnetic phases (AFM1, helical, and AFM3, cycloidal) with different moment orientations. Moreover, magnetotransport measurements indicate the presence of a topological Hall effect, with maximum values centered in the A phase. Together, these results render EuGa2Al2 a material with noncoplanar or topological spin texture in applied field. X-ray diffraction reveals an out-of-plane (OOP) charge density wave (CDW) below TCDW∼50 K while the magnetic propagation vector lies in plane below TN=19.5 K. Together these data point to a new route to realizing in-plane noncollinear spin textures through an OOP CDW. In turn, these noncollinear spin textures may be unstable against the formation of topological spin textures in an applied field.

关键词： Charge density waves Exotic phases of matter Hall effect Magnetic phase transitions Magnetotransport Symmetry protected topological states Topological materials

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The corrosion study of 90Cu-10Ni (UNS C70600) materials in ammonia and sulfide environments

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AIP Conference Proceedings 2021年第1期2338卷

作者： Husaini Ardy Firmansyah Sasmita Efvan Adhe Putra Pradana 1Materials Science and Engineering Research Group Bandung Institute of Technology Bandung 40132 Indonesia 2Materials Engineering Department Bandung Institute of Technology Bandung 40132 Indonesia

This paper presents the corrosion study results of 90Cu-10Ni material under static tensile stress during 15 days of immersion and vapor exposure in 10% ammonia, 10% Na2S, and the mixture of both. The corrosion products were Cu(OH)2, Cu2S, and copper ammonium ion complex. General corrosion occurred in all specimens, and there were no surface cracks. SCC was not observed because specimens were still in the SCC's initial stage, where the slip dissolution mechanism occurs accompanied by pitting and intergranular corrosion. The intergranular corrosion occurs on the immersed specimens, and pitting corrosion on the vapor exposure. The corrosion rates of vapor exposed specimens in the ammonia and the ammonia and sulfide mixed environments were the same because the ammonia's vapor concentration is the same, and the sulfides are unstable in the vapor phase. The corrosion rate data showed that tensile stresses did not affect the corrosion of UNS C70600 after 15 days of testing.

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Measurement of cationic diffusivity through Er 2 O 3 /Y 2 O 3 interdiffusion under AC-flash event

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Journal of the European Ceramic Society 2025年第14期45卷

作者： Ying Yang Hiroshi Masuda Fei Shen Ong Hidehiro Yoshida Department of Materials Science and Engineering School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Next Generation Zirconia Social Cooperation Program Institute of Engineering Innovation The University of Tokyo 2-11-16 Yayoi Bunkyo-ku Tokyo 113-8656 Japan

The diffusivity of Er cations in Y 2 O 3 was directly investigated using Er 2 O 3 /Y 2 O 3 interdiffusion couples under alternating current (AC) flash events. Specimen temperatures during the AC-flash events were determined by a combination of direct thermographic measurement and numerical simulations. Compared to conventional heat treatment without electric field, the diffusion of the Er cations proceeded more than 30 times faster in the AC-flash treatment at a specimen temperature of about 1700℃. This indicates that the cationic interdiffusion was athermally promoted by the AC electric field. Eventually, both the lattice and grain boundary diffusivities were 2–3 orders of magnitude greater under the AC-flash events than without the electric field at the specimen temperatures of 1550℃–1880℃. Grain growth and grain boundary migration associated with significant grain boundary bowing-out were also enhanced with the increasing current density.

关键词： Diffusion Flash event Ceramics Oxides Grain boundary migration

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News in Nanocrystals Seminar: Self-Assembly of Early Career Researchers toward Globally Accessible Nanoscience

News in Nanocrystals Seminar: Self-Assembly of Early Career ...

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作者： Baranov, Dmitry Šverko, Tara Moot, Taylor Keller, Helena R. Klein, Megan D. Vishnu, E.K. Balazs, Daniel M. Shulenberger, Katherine E. Italian Institute of Technology Genova16163 Italy Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States UbiQD Inc. 134 Eastgate Drive Los AlamosNM87544 United States Materials Science and Engineering Program University of Colorado BoulderCO80309 United States Thiruvananthapuram Vithura695 551 India Institute of Science and Technology Austria Am Campus 1 Klosterneuburg3400 Austria Department of Chemistry University of Colorado BoulderCO80309 United States

In 2020, many in-person scientific events were canceled due to the COVID-19 pandemic, creating a vacuum in networking and knowledge exchange between scientists. To fill this void in scientific communication, a group of early career nanocrystal enthusiasts launched the virtual seminar series, News in Nanocrystals, in the summer of 2020. By the end of the year, the series had attracted over 850 participants from 46 countries. In this Nano Focus, we describe the process of organizing the News in Nanocrystals seminar series;discuss its growth, emphasizing what the organizers have learned in terms of diversity and accessibility;and provide an outlook for the next steps and future opportunities. This summary and analysis of experiences and learned lessons are intended to inform the broader scientific community, especially those who are looking for avenues to continue fostering discussion and scientific engagement virtually, both during the pandemic and after. © Published 2021 by American Chemical Society.

关键词： Nanocrystals

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Emerging contaminants:A One Health perspective

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The Innovation 2024年第4期5卷 140-170,139页

作者： Fang Wang Leilei Xiang Kelvin Sze-Yin Leung Martin Elsner Ying Zhang Yuming Guo Bo Pan Hongwen Sun Taicheng An Guangguo Ying Bryan WBrooks Deyi Hou Damian EHelbling Jianqiang Sun Hao Qiu Timothy MVogel Wei Zhang Yanzheng Gao Myrna JSimpson Yi Luo Scott XChang Guanyong Su Bryan MWong Tzung-May Fu Dong Zhu Karl JJobst Chengjun Ge Frederic Coulon Jean Damascene Harindintwali Xiankui Zeng Haijun Wang Yuhao Fu Zhong Wei Rainer Lohmann Changer Chen Yang Song Concepcion Sanchez-Cid Yu Wang Ali El-Naggar Yiming Yao Yanran Huang Japhet Cheuk-Fung Law Chenggang Gu Huizhong Shen Yanpeng Gao Chao Qin Hao Li Tong Zhang Natàlia Corcoll Min Liu Daniel SAlessi Hui Li Kristian KBrandt Yolanda Pico Cheng Gu Jianhua Guo Jianqiang Su Philippe Corvini Mao Ye Teresa Rocha-Santos Huan He Yi Yang Meiping Tong Weina Zhang Fidèle Suanon Ferdi Brahushi Zhenyu Wang Syed AHashsham Marko Virta Qingbin Yuan Gaofei Jiang Louis A.Tremblay Qingwei Bu Jichun Wu Willie Peijnenburg Edward Topp Xinde Cao Xin Jiang Minghui Zheng Taolin Zhang Yongming Luo Lizhong Zhu Xiangdong Li DamiàBarceló Jianmin Chen Baoshan Xing Wulf Amelung Zongwei Cai Ravi Naidu Qirong Shen Janusz Pawliszyn Yong-guan Zhu Andreas Schaeffer Matthias C.Rillig Fengchang Wu Gang Yu James M.Tiedje State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry Hong Kong Baptist UniversityHong KongChina HKBU Institute of Research and Continuing Education Shenzhen Virtual University ParkShenzhenChina Technical University of Munich TUM School of Natural SciencesInstitute of Hydrochemistry85748 GarchingGermany School of Resources&Environment Northeast Agricultural UniversityHarbin 150030China Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourneVICAustralia Faculty of Environmental Science&Engineering Kunming University of Science&TechnologyKunming 650500China Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory of Environmental Theoretical Chemistry South China Normal UniversityGuangzhouGuangdong 510006China Department of Environmental Science Baylor UniversityWacoTXUSA Center for Reservoir and Aquatic Systems Research(CRASR) Baylor UniversityWacoTXUSA School of Environment Tsinghua UniversityBeijing 100084China School of Civil and Environmental Engineering Cornell UniversityIthacaNY 14853USA Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province Zhejiang University of TechnologyHangzhou 310014China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Laboratoire d’Ecologie Microbienne Universite Claude Bernard Lyon 1UMR CNRS 5557UMR INRAE 1418VetAgro Sup69622 VilleurbanneFrance Department of Pla

Environmental pollution is escalating due to rapid global development that often prioritizes human needs over planetary *** global efforts to mitigate legacy pollutants,the continuous introduction of new substances remains a major threat to both people and the *** response,global initiatives are focusing on risk assessment and regulation of emerging contaminants,as demonstrated by the ongoing efforts to establish the UN’s Intergovernmental science-Policy Panel on Chemicals,Waste,and Pollution *** review identifies the sources and impacts of emerging contaminants on planetary health,emphasizing the importance of adopting a One Health *** for monitoring and addressing these pollutants are discussed,underscoring the need for robust and socially equitable environmental policies at both regional and international *** actions are needed to transition toward sustainable pollution management practices to safeguard our planet for future generations.

关键词： pollution planet contaminants

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Electronic and magnetic properties of the topological semimetal candidate NdSbTe

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Physical Review B 2020年第23期101卷 235161-235161页

作者： Krishna Pandey Rabindra Basnet Aaron Wegner Gokul Acharya Md Rafique Un Nabi Jiangwei Liu Jian Wang Y. K. Takahashi Bo Da Jin Hu Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA Department of Physics University of Arkansas Fayetteville Arkansas 72701 USA Research Center for Functional Materials National Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan Institute for Materials Research and Center for Spintronics Research Network Tohoku University Sendai 980–8577 Japan Research Center for Magnetic and Spintronic Materials National Institute for Materials Science Sengen 1-2-1 Tsukuba Ibaraki 305-0047 Japan Research and Services Division of Materials Data and Integrated System National Institute for Materials Science Tsukuba Ibaraki 305-0044 Japan

ZrSiS-type materials represent a large material family with unusual coexistence of topological nonsymmorphic Dirac fermions and nodal-line fermions. As a special group of ZrSiS family, LnSbTe (Ln=lanthaniderare−earth) compounds provide a unique opportunity to explore new quantum phases due to the intrinsic magnetism induced by Ln. Here we report the single-crystal growth and characterization of NdSbTe, a previously unexplored LnSbTe compound. NdSbTe has an antiferromagnetic ground state with field-driven metamagnetic transitions similar to other known LnSbTe, but exhibits distinct enhanced electronic correlations characterized by large a Sommerfeld coefficient of 115mJ/molK2, which is the highest among the known LnSbTe compounds. Furthermore, our transport studies have revealed the coupling with magnetism and signatures of Kondo localization. All these findings establish NdSbTe as a platform for observing phenomena arising from the interplay between magnetism, topology, and electron correlations.

关键词： Magnetic order Magnetotransport Topological phases of matter Magnetic systems Single crystal materials Strongly correlated systems Topological materials Magnetic techniques Specific heat measurements Transport techniques

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Unraveling the Cr 2 N Precipitation and Its Negative Effect on the Corrosion Resistance of Friction Stir Welded UNS S32760 Super Duplex Stainless Steel

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Surfaces and Interfaces 2025年 71卷

作者： G.S. Vacchi W.S. de Carvalho C.P. Meinhardt L.A. Bergmann S.T. Amancio-Filho C.A.D. Rovere Munir Rachid Corrosion Laboratory Department of Materials Engineering Federal University of São Carlos Rodovia Washington Luis Km 235 São Carlos SP 13565-905 Brazil Graduate Program in Materials Science and Engineering Federal University of São Carlos Brazil Institute of Materials Science Joining and Forming BMK Endowed Professorship for Aviation Graz University of Technology – TU Graz Kopernikusgasse 24/1 Graz 8010 Austria Department of Mechanical Engineering Federal University of Pampa Avenida Tiarajú 810 Alegrete RS Brazil Helmholtz-Zentrum Hereon Institute of Materials Mechanics Solid State Materials Processing Max-Planck-Straße 1 Geesthacht Germany

The root surface of a friction stir welded super duplex stainless steel (UNS S32760) was thoroughly characterized in this study. The findings revealed a refined grain structure and a conspicuous increase of 50 HV 0.3 in the Root’s hardness. Interestingly, the volume fraction of the ferrite phase remained largely unchanged. Rapid cooling in the welding process led to the Cr 2 N precipitation at the ferrite/ferrite grain boundaries in the root area, significantly increasing sensitization, reducing localized corrosion resistance under high electrode potentials in a neutral pH saline environment, and adversely affecting root passivity in a hydrochloric acid environment compared to the base metal.

关键词： Friction stir welding Localized corrosion Polarization Sensitization Super duplex stainless steel

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Investigating the role of undercoordinated Pt sites at the surface of layered PtTe₂ for methanol decomposition

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Nature Communications 2024年第1期15卷 653页

作者： Hsueh, Jing-Wen Kuo, Lai-Hsiang Chen, Po-Han Chen, Wan-Hsin Chuang, Chi-Yao Kuo, Chia-Nung Lue, Chin-Shan Lai, Yu-Ling Liu, Bo-Hong Wang, Chia-Hsin Hsu, Yao-Jane Lin, Chun-Liang Chou, Jyh-Pin Luo, Meng-Fan Department of Physics National Central University No. 300 Jhongda Rd. Jhongli District Taoyuan 320317 Taiwan Department of Materials Science and Engineering National Tsing Hua University 101 Section 2 Kuang-Fu Road Hsinchu 300044 Taiwan Department of Electrophysics National Yang Ming Chiao Tung University No. 1001 University Rd. Hsinchu 300039 Taiwan Department of Physics National Cheng Kung University No. 1 University Rd. Tainan 701 Taiwan Taiwan Consortium of Emergent Crystalline Materials National Science and Technology Council Taipei 10601 Taiwan Program on Key Materials Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan 701 Taiwan National Synchrotron Radiation Research Center 101 Hsin-Ann Rd. Hsinchu Science Park Hsinchu 300092 Taiwan Department of Physics National Changhua University of Education No. 1 Jin-De Rd. Changhua 50007 Taiwan

Transition metal dichalcogenides, by virtue of their two-dimensional structures, could provide the largest active surface for reactions with minimal materials consumed, which has long been pursued in the design of ideal catalysts. Nevertheless, their structurally perfect basal planes are typically inert;their surface defects, such as under-coordinated atoms at the surfaces or edges, can instead serve as catalytically active centers. Here we show a reaction probability > 90 % for adsorbed methanol (CH₃OH) on under-coordinated Pt sites at surface Te vacancies, produced with Ar⁺ bombardment, on layered PtTe₂ — approximately 60 % of the methanol decompose to surface intermediates CH_xO (x = 2, 3) and 35 % to CH_x (x = 1, 2), and an ultimate production of gaseous molecular hydrogen, methane, water and formaldehyde. The characteristic reactivity is attributed to both the triangular positioning and varied degrees of oxidation of the under-coordinated Pt at Te vacancies. © 2024, The Author(s).

关键词： Surface spectroscopy Chemical physics Heterogeneous catalysis Surfaces interfaces and thin films

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Enhancing Stability and Performance in Perovskite Solar Cells Through Rationally Designed Phenanthro[9,10-D]Imidazole Derivatives for Tailored Interfacial engineering

SSRN

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SSRN 2024年

作者： Sun, Shih-Sheng Ramanujam, Rajarathinam Shi, Zhong-En Lung, Chien-Yu Li, Sie-Rong Wei, William Wu Wang, Chi-Chun Chen, Chih Ping Institute of Chemistry Academia Sinica Nankang Taipei11529 Taiwan Taiwan International Graduate Program Sustainable Chemical Science and Technology Academia Sinica Nankang Taipei11529 Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University Hsinchu30050 Taiwan Department of Materials Engineering Organic Electronics Research Center Ming Chi University of Technology 84 Gunjuan Road Taishan New Taipei City24301 Taiwan Taipei Fuhsing Private School 262 Section 1 Dun-Hua South Road Taipei Taiwan College of Engineering Center for Sustainability and Energy Technologies Chang Gung University Taoyuan City33302 Taiwan

Interfacial engineering techniques play a significant role in the development of perovskite solar cells (PSCs). In inverted PSCs, nickel oxide (NiOx) is commonly used as a hole transport material (HTM). The poor interactions at the NiOx/CH3NH3PbI3 (MAPbI3) interface contributed to the low stability and power conversion efficiency (PCE) in devices. To address this issue, dopant-free ultrathin interfacial layers (IFLs) have been introduced between the NiOx and perovskite. These IFLs enhance the chemical interaction between the NiOx and perovskite interfaces and result in improved device performance. Herein, T-shape phenanthro[9,10-d]imidazole derivatives, SR-1 and SR-2, were designed and synthesized. The SR-molecules were employed as IFL materials in p-i-n devices with a device configuration of ITO/NiOx/IFL/MAPbI3/PCBM/BCP/Ag. Notably, the IFLs serve multiple functions: modifying the energy levels of NiOx, improving the surface roughness and crystallinity of MAPbI3, passivating defects, enhancing charge extraction, and reducing trap density at the NiOx/MAPbI3 interface. As a result, the PCEs of both devices with SR-1 and SR-2 IFLs outperformed that of the pristine device. The best performance of 20.3% efficiency with nearly negligible hysteresis was achieved from the device with SR-1. The devices with SR-molecules achieved remarkable thermal stability under ambient air conditions and continuous heating at 60 °C with 50-60% relative humidity. © 2024, The Authors. All rights reserved.

关键词： Thermodynamic stability

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Reducing Anisotropy of Rhombohedral Bi-Rich Phase for High-Performance Ag-Alloyed Sn-Bi Low-Temperature Solders

SSRN

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SSRN 2023年

作者： Yang, Chih-Han Liu, Yu-Chen Nishikawa, Hiroshi Lin, Shih-Kang Department of Materials Science and Engineering National Cheng Kung University Tainan70101 Taiwan Joining and Welding Research Institute Osaka University 11-1 Mihogaoka Ibaraki Osaka567-0047 Japan Research Center National Cheng Kung University Tainan70101 Taiwan Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan Core Facility Center National Cheng Kung University Tainan70101 Taiwan

The rhombohedral structure is with anisotropic properties, leading to brittle mechanical properties. However, it is one of the major constituent phases, the (Bi) phase, in the Sn-Bi-based low-temperature solders, which is demanding in the electronic industry for reducing the soldering temperature and alleviating the warpage in high-density fine-pitch electronic packaging. Herein, we proposed a high-performance Ag-alloyed Sn-Bi (SBA) low-temperature solder by reducing the fraction and, more importantly, the anisotropy of the (Bi) phase. We found that the (Bi) phase exhibited considerable solubility for Ag and Sn, even after thermal aging, without any nanoprecipitates as confirmed with both CALPHAD-type thermodynamic modeling and high-resolution TEM. The solution effects of Ag and Sn in the (Bi) phase is elaborated based on in situ nano-indentation, EPMA compositional analyses, EBSD characterizations, and ab initio calculations. The presence of Ag and Sn in the (Bi) phases resulted in both solid solution hardening and softening effects, depending on the Schmid factor of the grain. As a result, in (Bi) polycrystals, alloying could effectively mitigate the anisotropic mechanical properties of the (Bi) phase and facilitated a more uniform dispersion of forces exerted among (Bi) grains in all orientations. Consequently, the designed SBA solder exhibited superior mechanical properties, e.g., an ultimate tensile strength (UTS) of 55 MPa, elongation of 46%, and toughness of 20.6 x 106 J/m3 at a strain rate of 0.0005 s-1. This understanding opens the door for enhanced rhombohedral phase in alloy design for various applications. © 2023, The Authors. All rights reserved.

关键词： Anisotropy

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