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Rare earth Ce and Y cation co-substitution and its effects on the strain, elasticity, and magnetism of Co-Zn ferrite nanomaterials

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Ceramics International 2025年第16期51卷 21675-21688页

作者： Patil, Parineeta C. Gaikwad, Asha A. Phase, V.P. Kadam, R.H. Shirsath, Sagar E. Chamargore, Jaishree J. Department of Chemistry Vasantrao Naik College Maharashtra Chhatrapati Sambhajinagar431001 India P.E.S. College of Engineering Maharashtra Chhatrapati Sambhajinagar431001 India Department of Physics Y. C. College Tuljapur Maharashtra Dharashiv India Materials Science Research Laboratory Shrikrishna College Gunjoti MS Dharashiv India Department of Physics Vivekanand College MS Chhatrapati Sambhajinagar431001 India School of Materials Science and Engineering University of New South Wales Sydney NSW2052 Australia

This study investigates the structural, elastic, and magnetic properties of Ce3+ and Y3+ co-substituted Co0.85Zn0.15Fe2-2xO4 spinel ferrite to understand the influence of rare-earth ion incorporation on the material's overall performance. The samples were synthesized using the sol-gel auto-combustion method, and their phase purity, crystallinity, and structural parameters were confirmed using X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy. The XRD analysis revealed a single-phase cubic spinel structure with a systematic increase in lattice constant and crystallite size as Ce3+ and Y3+ concentrations increased, attributable to the larger ionic radii of the substituents. FTIR spectra exhibited shifts in metal-oxygen stretching vibrations, indicating lattice expansion and bond stiffness variations. Strain analysis using Williamson-Hall and Size-Strain Plot methods revealed increased microstrain and crystallite size with higher dopant levels, suggesting lattice distortions. Elastic parameters, including stiffness constant, bulk modulus, and Young's modulus, improved with increasing rare-earth content, indicating enhanced mechanical stability. Conversely, magnetic measurements demonstrated a reduction in saturation magnetization, coercivity, and anisotropy due to magnetic sublattice dilution, lattice strain, and weakened superexchange interactions. These results highlight that rare-earth co-substitution is an effective strategy to tailor the structural and mechanical properties of Co-Zn ferrite, though with a trade-off in magnetic performance, offering a pathway to customize these materials for advanced technological applications. © 2025 The Author(s)

关键词： Saturation magnetization

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Crossed nonlinear dynamical Hall effect in twisted bilayers

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Physical Review Research 2024年第1期6卷 L012059-L012059页

作者： Cong Chen Dawei Zhai Cong Xiao Wang Yao New Cornerstone Science Laboratory Department of Physics University of Hong Kong Hong Kong China HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong Hong Kong China Institute of Applied Physics and Materials Engineering University of Macau Taipa Macau China

We propose a nonlinear dynamical Hall effect characteristic of layered materials with chiral symmetry, which is driven by the joint action of in-plane and time variation of out-of-plane ac fields jH∼Ė⊥×E∥. A different band geometric quantity—interlayer Berry connection polarizability, which probes a mixed quantum metric characteristic of layer hybridized electrons by twisted interlayer coupling—underlies this effect. When the two orthogonal fields have a common frequency, their phase difference controls the on/off, direction, and magnitude of the rectified Hall current. We show sizable effects in twisted homobilayer transition metal dichalcogenides and twisted bilayer graphene over a broad range of twist angles. Our work opens the door to discovering mixed quantum metric responses unique to van der Waals stacking and concomitant applications under the nonlinear spotlight.

关键词： Anomalous Hall effect Transport phenomena Layered crystals Transition metal dichalcogenides Twisted heterostructures

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New Strategy for Boosting Cathodic Performance of Protonic Ceramic Fuel Cells Through Incorporating a Superior Hydronation Second Phase

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Energy & Environmental materials 2024年第4期7卷 83-92页

作者： Chuan Zhou Xixi Wang Dongliang Liu Meijuan Fei Jie Dai Daqin Guan Zhiwei Hu Linjuan Zhang Yu Wang Wei Wang Ryan O'Hayre San Ping Jiang Wei Zhou Meilin Liu Zongping Shao State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China Max Planck Institute for Chemical Physics of Solids NEothnitzer Strasse 40Dresden 01187Germany Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China Department of Metallurgical and Materials Engineering Colorado School of MinesGolden COUSA WA School of Mines:Minerals Energy and Chemical Engineering(WASMMECE)Curtin UniversityPerth WA 6102Australia Suzhou Laboratory Suzhou 215000China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332-0245USA

For protonic ceramic fuel cells,it is key to develop material with high intrinsic activity for oxygen activation and bulk proton conductivity enabling water formation at entire electrode ***,a higher water content which benefitting for the increasing proton conductivity will not only dilute the oxygen in the gas,but also suppress the O_(2)adsorption on the electrode ***,a new electrode design concept is proposed,that may overcome this *** introducing a second phase with high-hydrating capability into a conventional cobalt-free perovskite to form a unique nanocomposite electrode,high proton conductivity/concentration can be reached at low water content in *** addition,the hydronation creates additional fast proton transport channel along the two-phase *** a result,high protonic conductivity is reached,leading to a new breakthrough in performance for proton ceramic fuel cells and electrolysis cells devices among available air electrodes.

关键词： cathode high-hydrating capability proton conductivity protonic ceramic fuel cells

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Tetramethylammonium Iodide Additive for Enhancing the Charge Carrier Mobilities of Diketopyrrolopyrrole-Based Conju-gated Polymer in Ambipolar Organic Field-Effect Transistors

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Chinese Journal of Chemistry 2023年第9期41卷 1028-1036页

作者： Waner He Qian Liu Sultan Otep Hidetoshi Matsumoto Sergei Manzhos Prashant Sonar Aung Ko Ko Kyaw Tsuyoshi Michinobu Department of Materials Science and Engineering Tokyo Institute of TechnologyTokyo 152-8552Japan Guangdong University Key Laboratory for Advanced Quantum Dot Displays Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhenGuangdong 518055China Center for Materials Science School of Chemistry and PhysicsFaculty of ScienceQueensland University of TechnologyBrisbaneQLD 4000Australia School of Materials and Chemical Technology Tokyo Institute of TechnologyTokyo 152-8552Japan

Diketopyrrolopyrrole(DPP)is one of the most promising building blocks for constructing polymer semiconductors with high charge-carrier mobilities in organic field-effect transistors(OFETs).In this study,a novel DPP-based conjugated polymer,PDPPy-BDD,was designed and *** ambipolar field-effect transistor characteristics were realized with the average hole and electron mobilities of 3.5×10^(-3)and 3.07×10^(-2)cm^(2)V^(-1)s^(-1),*** the hole and electron mobilities could be successfully en-hanced by using a tetramethylammonium iodide(NMe4l)*** an enhancement was attributed to the formation of stronger interchainπ-πstackings,the weakening of the face-on packing orientation in the thin film state,and the higher channel conductivi-ties in the OFETs.

关键词： Diketopyrrolopyrrole Pyridine Charge transport Conjugated polymers Organic field-effect transistors Semiconductors Tetramethylammonium iodide Thin films

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Development of a novel quality control indicator for coffee roasting based on the digitalization of smell by a portable electronic nose 20

Development of a novel quality control indicator for coffee ...

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20th International Joint Conference on Computer science and Software engineering, JCSSE 2023

作者： Somaudon, Varanya Sakuldee, Pathapee Kerdcharoen, Teerakiat Materials Science and Engineering Program Mahidol University Faculty of Science Bangkok Thailand School of Science Material Engineering Mae Fah Luang University Chiang rai Thailand Mahidol University Faculty of Science Department of Physics Bangkok Thailand

ISBN: (纸本)9798350300505

Northern Thailand is home to several Arabica coffee-growing regions, including Mae-kampong, Teentok, Mae-lord, and Monngo Valleys, whose coffees are featured throughout this study. These coffees have distinct aromas and flavors due to their varied cultivation locations, which are influenced by unique climatic conditions. The purpose of this paper is to comprehend the aroma of coffees brought from various locations and roasted under the same conditions. Our lab-made electronic nose (e-nose) was used to digitalize and analyze the smell of coffee. In order to monitor the coffee scent throughout roasting and assess how similar the aromas of coffee samples taken from various locations are to one another, principal component analysis and hierarchical cluster analysis were used. It was found that our e-nose system is an effective tool for determining the geo-location of the coffee origin as well as for quality control of coffee production. © 2023 IEEE.

关键词： Electronic nose

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Distance Learning at the MS and PhD Levels in the Nuclear and Radiation engineering program, Nuclear and Applied Robotics, materials science and engineering and Walker department of Mechanical engineering at the University of Texas at Austin

Distance Learning at the MS and PhD Levels in the Nuclear an...

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2023 Transactions of the American Nuclear Society Winter Conference and Expo, ANS 2023

作者： Landsberger1, Sheldon Charlton, William Clamo, Kevin Ezekoye, Ofodike Kovar, Desiderio Haas, Derek Pryor, Mitchell University of Texas at Austin Nuclear and Radiation Engineering Program Nuclear Engineering Teaching Lab 10100 Burnet Road Pickle Research Campus R-9000 AustinTX United States Walker Department of Mechanical Engineering University of Texas at Austin 204.Dean Keeton ETC II 5.160 AustinTX United States The University of Texas at Austin Materials Science and Engineering Walker Department of Mechanical Engineering 204 Dean Keeton ETC II 5.100 AustinTX United States

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Anomalous electronic energy relaxation and soft phonons in the Dirac semimetal Cd3As2

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Physical Review B 2024年第7期110卷 075131-075131页

作者： Rishi Bhandia David Barbalas Run Xiao Juan R. Chamorro Tanya Berry Tyrel M. McQueen Nitin Samarth N. P. Armitage The Institute of Quantum Matter Department of Physics and Astronomy The Department of Physics The Department of Chemistry Department of Materials Science and Engineering The

We have used a combination of linear response time-domain THz spectroscopy (TDTS) and nonlinear THz pump-probe spectroscopy to separately probe the electronic momentum and energy relaxation rates, respectively, of the Dirac semimetal Cd3As2. We find, consistent with prior measurements, that Cd3As2 has enormous nonlinearities in the THz frequency range. We extract the momentum relaxation rate of Cd3As2 using Drude fits to the optical conductivity. We also conduct THz-range 2D coherent spectroscopy and find that the dominant response is a pump-probe signal, which allows us to extract the energy relaxation rate. We find that the rate of energy relaxation decreases down to the lowest measured temperatures. We connect this to Cd3As2's anomalous lattice dynamics, evidence for which is found in its low thermal conductivity and soft phonons in Raman scattering. We believe the lack of a peak in the energy relaxation rate as a function of T is related to the linear-in-T dependence of the current relaxation at low T; e.g., the phonon scattering is elastic from the lowest measured temperature, 5 K, to at least as high as 120 K.

关键词： Electrical conductivity Electrical properties Topological materials Crystalline systems Semimetals Single crystal materials Four-wave mixing Terahertz techniques

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CuIr Single-Atom Alloys Prepared by Pulsed Laser Ablation in Liquidfor pH-Universal Hydrogen Evolution Reaction

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Transactions of Tianjin University 2025年第1期31卷 4-14页

作者： Siyu Sun Feifei Zhang Wanlin Liu Rui Zhang Pengfei Yin Jing Yang Cunku Dong Xinming Nie Hui Liu Xiwen Du Institute of New Energy Materials School of Materials Science andEngineeringTianjin UniversityTianjin300350China Department of Electronics Nankai UniversityTianjin300350China School of Physics and Electronic Engineering Jiangsu Normal UniversityXuzhou221116China

The development of highly active and cost-effective catalysts for the full pH range of the hydrogen evolution reaction(HER)to meet the industrial application demands is an urgent *** this work,the performance and structure–activityrelationships of CuIr alloys prepared by the pulsed laser ablation in liquid technique as full pH range HER catalysts *** indicated that Ir is doped into the Cu matrix as single atoms in CuIr-0.1,and CuIr-0.1 single-atom alloys(SAAs)exhibit superior HER performance and stability across the full pH range,with overpotentials of 135,203,and 172 mVat the current density of 10 mA/cm^(2)in acidic,neutral,and alkaline electrolytes,*** enhanced performance ofCuIr-0.1 SAAs can be attributed to the abundant active sites and accelerated reaction kinetics brought about by the *** work successfully alloyed two immiscible metals to improve the catalytic performance,providing an avenue forthe development of highly efficient and versatile HER catalysts for industrial applications.

关键词： CuIr single-atom alloys Immiscible alloy Pulsed laser ablation in liquid Hydrogen evolution reaction Full pH range

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Single-element amorphous palladium nanoparticles formed via phase separation

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Nano Research 2022年第6期15卷 5575-5580页

作者： Dong Sheng He Yi Huang Benjamin D.Myers Dieter Isheim Xinyu Fan Guang-Jie Xia Yunsheng Deng Lin Xie Shaobo Han Yang Qiu Yang-Gang Wang Junhua Luan Zengbao Jiao Li Huang Vinayak P.Dravid Jiaqing He Pico Center and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Physically vitrifying amorphous single-element metal requires ultrahigh cooling rates,which are still unachievable for most of the closest-packed ***,we report a facile chemical synthetic strategy for single-element amorphous palladium nanoparticles with a purity of 99.35 at.%±0.23 at.%from palladium–silicon liquid ***-situ transmission electron microscopy directly detected the solidification of palladium and the separation of *** hydrogen absorption experiment showed that the amorphous palladium expanded little upon hydrogen uptake,exhibiting a great potential application for hydrogen *** results provide insight into the formation of amorphous metal at nanoscale.

关键词： Pd single-element metallic glass nanoparticle phase separation undercooling

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Boosting Monolayer Transition Metal Dichalcogenides Growth by Hydrogen-Free Ramping during Chemical Vapor Deposition

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Nano Letters 2024年第27期24卷 8277-8286页

作者： Liu, Hongwei Zhang, Tianyi Wu, Peng Lee, Hae Won Liu, Zhenjing Tang, Tsz Wing Tang, Shin-Yi Kang, Ting Park, Ji-Hoon Wang, Jun Zhang, Kenan Zheng, Xudong Peng, Yu-Ren Chueh, Yu-Lun Liu, Yuan Palacios, Tomás Kong, Jing Luo, Zhengtang Department of Chemical and Biological Engineering Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology William Mong Institute of Nano Science and Technology and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology Kowloon999077 Hong Kong Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Materials Science and Engineering National Tsing-Hua University Hsinchu30013 Taiwan Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education School of Physics and Electronics Hunan University Changsha410082 China

The controlled vapor-phase synthesis of two-dimensional (2D) transition metal dichalcogenides (TMDs) is essential for functional applications. While chemical vapor deposition (CVD) techniques have been successful for transition metal sulfides, extending these methods to selenides and tellurides often faces challenges due to uncertain roles of hydrogen (H2) in their synthesis. Using CVD growth of MoSe2 as an example, this study illustrates the role of a H2-free environment during temperature ramping in suppressing the reduction of MoO3, which promotes effective vaporization and selenization of the Mo precursor to form MoSe2 monolayers with excellent crystal quality. As-synthesized MoSe2 monolayer-based field-effect transistors show excellent carrier mobility of up to 20.9 cm2/(V·s) with an on-off ratio of 7 × 107. This approach can be extended to other TMDs, such as WSe2, MoTe2, and MoSe2/WSe2 in-plane heterostructures. Our work provides a rational and facile approach to reproducibly synthesize high-quality TMD monolayers, facilitating their translation from laboratory to manufacturing. © 2024 American Chemical Society.

关键词： Monolayers

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