Article
Materials Science, Multidisciplinary
A. Kiecana, W. Schaefers, M. Thijs, R. Dankelman, H. Ojiyed, I. Batashev, F. Zhang, N. H. van Dijk, E. Bruck
Summary: The structural, magnetic and magnetocaloric properties of Mn3Sn1-xZnxC antiperovskite carbides were investigated. With increasing Zn content, the first-order magnetic transition (FOMT) is weakened. The Curie temperature (T-C) decreases first from 273 to 197 K, and then increases for x > 0.3, reaching a maximum of 430 K for x = 1.0. An increase in T-C is accompanied by significant changes in magnetic behavior and magnetization.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Bangfeng Zong, Xiansong Liu, Xucai Kan, Chaocheng Liu
Summary: The demand for environmentally friendly and energy-efficient refrigeration technology is increasing due to sustainable development. Magnetic refrigeration, specifically the antiperovskite compound Sn0.6NFe3.4, shows potential for application in this field. This study explores the crystal structure, magnetic properties, and magnetocaloric effect (MCE) of Sn0.6NFe3.4, revealing significant characteristics such as a suitable paramagnetic Curie temperature, a sharp transition process from ferromagnetic to paramagnetic phase, and a large magnetization. The material exhibits a wide distribution of magnetic entropy change and achieves a high relative cooling power at a magnetic field change of 45 kOe. Compared to other conventional magnetic refrigeration materials, Sn0.6NFe3.4 demonstrates a considerable MCE and offers a more affordable price advantage. These findings are expected to attract researchers' attention towards the development of magnetic refrigeration devices.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
R. Frison, J. Kuespert, Qisi Wang, O. Ivashko, M. V. Zimmermann, M. Meven, D. Bucher, J. Larsen, Ch. Niedermayer, M. Janoschek, T. Kurosawa, N. Momono, M. Oda, N. B. Christensen, J. Chang
Summary: A combined x-ray and neutron diffraction study was conducted on the stripe-ordered superconductor La₀Sr₀.₁₂CuO₄. The crystal structure was found to be consistent with the orthorhombic Bmab space group commonly reported in the literature. However, this structure is not symmetry compatible with the second-order phase transition into the stripe order phase. Many forbidden Bragg peaks in the Bmab space group were observed in this study, and the analysis revealed monoclinic lattice distortions consistent with charge stripe order.
Article
Physics, Applied
R. Almeida, C. Amorim, J. S. Amaral, J. P. Araujo, J. H. Belo
Summary: This study presents a method to directly measure the parameter ΔT(ad) using a commercial SQUID device. By compensating the measurements, the shape and peak value of the ΔT-ad(T) curve can be approximated, enabling the search for new materials.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Saminathan Ramakrishnan, Jason R. Stagno, Chelsie E. Conrad, Jienyu Ding, Ping Yu, Yuba R. Bhandari, Yun-Tzai Lee, Gary Pauly, Oleksandr Yefanov, Max O. Wiedorn, Juraj Knoska, Dominik Oberthuer, Thomas A. White, Anton Barty, Valerio Mariani, Chufeng Li, Wolfgang Brehm, William F. Heinz, Valentin Magidson, Stephen Lockett, Mark S. Hunter, Sebastien Boutet, Nadia A. Zatsepin, Xiaobing Zuo, Thomas D. Grant, Suraj Pandey, Marius Schmidt, John C. H. Spence, Henry N. Chapman, Yun-Xing Wang
Summary: Time-resolved crystallography is typically used to monitor small conformational changes within biomacromolecules in the same lattice. This study reveals the interplay between synchronous molecular rearrangements and lattice phase transitions in RNA crystals, laying the foundation for investigating large conformational changes using time-resolved crystallography.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Matilde Saura-Muzquiz, Maxim Avdeev, Helen E. A. Brand, Brendan J. Kennedy
Summary: The structures and magnetic properties of Os4+ (5d4) halides are described, and the crystal structures and thermal stability of different compounds are studied. The experimental results show that these compounds exhibit unique magnetic behavior with a weak magnetic ground state.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Niels Kubitza, Pedram Babaei, Ulf Wiedwald, Christina S. Birkel
Summary: Magnetocaloric materials have the potential to change refrigeration technology, but the current synthesis methods are problematic. We propose a rapid sol-gel approach to synthesize highly pure Mn3GaC phase and demonstrate the ability to alter its magnetic properties by adjusting reaction parameters.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Bingrui Peng, Yi Jiang, Zhong Fang, Hongming Weng, Chen Fang
Summary: This research demonstrates that magnetic space group symmetries protect topological invariants and surface states that are different from nonmagnetic topological states. By constructing topological crystals using lower-dimensional building blocks, the complete topological classification of electron band insulators with significant spin-orbit coupling for each magnetic space group in three dimensions is obtained. The symmetry-based indicators are also computed, establishing the complete mapping from symmetry representations to topological invariants.
Article
Chemistry, Inorganic & Nuclear
Huicai Xie, Lu Tian, Qi Chen, Hao Sun, Xinqiang Gao, Zhenxing Li, Zhaojun Mo, Jun Shen
Summary: The study demonstrates that the magnetocaloric material LiHoF4 exhibits a giant and reversible low field magnetocaloric effect at low temperatures, making it a high-performance and practical candidate for cryogenic magnetic refrigeration.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
Alexandra Morscher, Matthew S. Dyer, Benjamin B. Duff, Guopeng Han, Jacinthe Gamon, Luke M. Daniels, Yun Dang, T. Wesley Surta, Craig M. Robertson, Frederic Blanc, John B. Claridge, Matthew J. Rosseinsky
Summary: A hexagonal analogue of the cubic lithium argyrodite family of solid electrolytes, Li6SiO4Cl2, is isolated using a computation-experiment approach. The material exhibits low lithium conductivity at room temperature and undergoes a structure transition at a predicted temperature. This newly established structural connection between hexagonal and cubic stacking motifs opens up unexplored chemistry significant to the field of solid electrolytes.
CHEMISTRY OF MATERIALS
(2021)
Article
Physics, Applied
A. B. Batdalov, L. N. Khanov, A. V. Mashirov, V. V. Koledov, A. M. Aliev
Summary: The study found that in the Ni46Mn41In13 Heusler alloy, the magnetic contribution is dominant in total entropy change, and there is a significant difference in the magnetocaloric effect between heating and cooling processes.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Anitha Anand, M. Manjuladevi, R. K. Veena, V. S. Veena, Yuri S. Koshkid'ko, S. Sagar
Summary: The study investigates the effect of Ti doping on structural, magnetic, and magnetocaloric properties of Nd-based manganites, finding that N-0.15 exhibits increased Working Temperature Span and decreased magnetic hysteresis loss, making it a potential candidate for low-temperature magnetic refrigeration.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Engineering, Electrical & Electronic
R. Selmi, W. Cherif, A. R. Sarabando, N. M. Ferreira, L. Ktari
Summary: Polycrystalline compounds were synthesized using the ceramic method and shown to have magnetic field tunability. The samples undergo a paramagnetic-ferromagnetic phase transition within a certain temperature range, and the transition temperature increases with the increase of La doping concentration.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Physics, Multidisciplinary
Ricardo D. dos Reis, Luana Caron, Sanjay Singh, Claudia Felser, Michael Nicklas
Summary: Magnetic shape-memory materials have the potential to be magnetic refrigerants, but hysteresis effects arising from their first-order martensitic transition may hinder practical applications. Research showed that the magnetic entropy change is method-dependent and directly related to the temperature and field history of the experimental processes.
Review
Materials Science, Multidisciplinary
J. S. Amaral, V. S. Amaral
Summary: Magnetocaloric materials are important for energy applications, and materials with first-order magnetic phase transition are advantageous for enhanced magnetization change and magnetocaloric effect. This study provides an overview of models used to simulate magnetic field and temperature-dependent properties of these materials, including mean-field models and Ising-like microscopic models. The limitations and predicted properties of these models are discussed.
FRONTIERS IN MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xuefei Miao, Chenxu Wang, Tuwei Liao, Shenghong Ju, Jiaju Zha, Wenyao Wang, Jun Liu, Yujing Zhang, Qingyong Ren, Feng Xu, Luana Caron
Summary: Magnetic refrigeration based on the magnetocaloric effect has the potential to revolutionize the refrigeration industry due to its high energy efficiency and elimination of greenhouse gas emissions. However, challenges in magnetocaloric materials such as low thermal conductivity and poor mechanical properties hinder its implementation. This paper presents a novel magnetocaloric composite with a unique microstructure that addresses these challenges. The composite exhibits high thermal conductivity and compressive strength, making it a promising solution for practical applications in magnetic refrigeration.
Article
Chemistry, Multidisciplinary
Zi-Jia Cheng, Ilya Belopolski, Hung-Ju Tien, Tyler A. Cochran, Xian P. Yang, Wenlong Ma, Jia-Xin Yin, Dong Chen, Junyi Zhang, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Guangming Cheng, Md. Shafayat Hossain, Qi Zhang, Maksim Litskevich, Yu-Xiao Jiang, Nan Yao, Niels B. M. Schroeter, Vladimir N. Strocov, Biao Lian, Claudia Felser, Guoqing Chang, Shuang Jia, Tay-Rong Chang, M. Zahid Hasan
Summary: Kagome magnets offer a fascinating platform for studying topological quantum phenomena, with highly tunable properties resulting from the interplay between crystal structure, magnetization, and spin-orbit coupling. In this study, Weyl lines with strong out-of-plane dispersion are directly visualized in the A-A stacked kagome magnet GdMn6Sn6 using angle-resolved photoemission spectroscopy. Remarkably, the Weyl lines exhibit a strong magnetization-direction-tunable spin-orbit coupling gap and binding energy tunability when substituting Gd with Tb and Li, respectively. These findings demonstrate the potential of using magnetization direction and valence counting as efficient tuning knobs for controlling distinct 3D topological phases, and highlight the versatility of the AMn(6)Sn(6) material family for exploring emergent topological quantum responses.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Chenxu Wang, Xuefei Miao, Jiaju Zha, Wenhui Guo, Qingyong Ren, Yujing Zhang, Feng Xu, Luana Caron
Summary: The geometry of a magnetocaloric regenerator plays a crucial role in the performance and heat exchange efficiency of a magnetic refrigerator. A new and easy method has been proposed to produce monolithic MRs with highly ordered and unidirectional oriented microchannels. The MRs retain an orthorhombic perovskite structure after sintering, exhibiting a significantly higher isothermal entropy change.
SCRIPTA MATERIALIA
(2023)
Article
Physics, Multidisciplinary
Norbert H. H. Freitag, Christopher F. F. Reiche, Volker Neu, Parul Devi, Ulrich Burkhardt, Claudia Felser, Daniel Wolf, Axel Lubk, Bernd Buechner, Thomas Muehl
Summary: This article presents a quantitative magnetic force microscopy technique that can simultaneously map one magnetic stray-field component and its spatial derivative. It is applied to investigate circular magnetic nano-domains in MnNiGa bulk samples, providing bubble diameters and spatial extent in depth. The experimental results indicate that the magnetic bubbles have a significant spatial extent in depth and a buried bubble top base.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Hyeuk Jin Han, Sushant Kumar, Gangtae Jin, Xiaoyang Ji, James L. Hart, David J. Hynek, Quynh P. Sam, Vicky Hasse, Claudia Felser, David G. Cahill, Ravishankar Sundararaman, Judy J. Cha
Summary: The increasing resistance of copper (Cu) interconnects in integrated circuits is a major challenge for downscaling beyond 7 nm technology. Topological semimetals like molybdenum phosphide (MoP) nanowires show unprecedented resistivity scaling, superior to nanoscale Cu interconnects. MoP has better stability against electromigration and resistance to surface oxidation compared to Cu, making it an attractive alternative for the scaling challenge of Cu interconnects.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Guowei Li, Qun Yang, Kaustuv Manna, Yudi Zhang, Patrick Merz, Chandra Shekhar, Yang Zhang, Hua Lv, Anastasios Markou, Yan Sun, Claudia Felser
Summary: The study focuses on the enantiomeric processes in inorganic crystals, aiming to understand how homochirality develops in nature and chemical reactions. By growing B20 group PdGa single crystals with different chiral lattices, enantioselective recognition of 3,4-dihydroxyphenylalanine (DOPA) is achieved based on the orbital angular momentum (OAM) polarization. Results indicate that the adsorption energies of PdGa crystals and DOPA molecules differ depending on the pairing of O-2p orbital of DOPA with Pd-4d orbital of PdGa, providing a possible explanation for the emergence of chirality in nature.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Tanya Berry, Nicodemos Varnava, Dominic H. Ryan, Veronica J. Stewart, Riho Rasta, Ivo Heinmaa, Nitesh Kumar, Walter Schnelle, Rishi Bhandia, Christopher M. Pasco, N. P. Armitage, Raivo Stern, Claudia Felser, David Vanderbilt, Tyrel M. McQueen
Summary: Electrons in solids adopt complex patterns of chemical bonding driven by energy gains and costs. We report a chemical pressure-driven transition in EuMn2P2 from proper Mn magnetic ordering to a Mn magnetic phase crossover, despite remaining an insulator at all temperatures. The absence of a Mn magnetic phase transition contrasts with other isoelectronic materials. Our results demonstrate the sensitivity of the band structure to magnetic order and imply the suppression of long-range Mn magnetic order by chemical pressure.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Physics, Multidisciplinary
Belen E. Zuniga-Cespedes, Kaustuv Manna, Hilary M. L. Noad, Po-Ya Yang, Michael Nicklas, Claudia Felser, Andrew P. Mackenzie, Clifford W. Hicks
Summary: By applying a combination of uniaxial stress and magnetic field, we have observed a significant anomalous Hall effect in a bulk sample of a cubic member of the Mn3X family for the first time. The observed effect remains unchanged when the stress is removed, indicating that it is not induced by stress-induced ferromagnetic moments.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Tyler A. Cochran, Ilya Belopolski, Kaustuv Manna, Mohammad Yahyavi, Liu Yiyuan, Daniel S. Sanchez, Cheng Zi-Jia, Xian P. Yang, Daniel Multer, Yin Jia-Xin, Horst Borrmann, Alla Chikina, Jonas A. Krieger, Jaime Sanchez-Barriga, Patrick Le Fevre, Francois Bertran, Vladimir N. Strocov, Jonathan D. Denlinger, Chang Tay-Rong, Jia Shuang, Claudia Felser, Hsin Lin, Chang Guoqing, M. Zahid Hasan
Summary: In this Letter, the authors discovered the higher-fold topology of a chiral crystal using a combination of fine-tuned chemical engineering and photoemission spectroscopy. They identified all bulk branches of a higher-fold chiral fermion and revealed a multigap bulk boundary correspondence. This demonstration of multigap electronic topology will drive future research on unconventional topological responses.
PHYSICAL REVIEW LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Luca Tomarchio, Sen Mou, Lorenzo Mosesso, Anastasios Markou, Edouard Lesne, Claudia Felser, Stefano Lupi
Summary: In this paper, we investigate the terahertz emission from thin films of the magnetic topological nodal semimetal Co2MnGa when excited by femtosecond optical pulses. We identify multiple THz generation mechanisms, including a photon-drag effect induced by radiation pressure and a photovoltaic effect from the topological surface states of CMG. This interplay between generation mechanisms highlights the potential of Co2MnGa topological nodal semimetals for THz emitter devices.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Andrew M. Ochs, Gerhard H. Fecher, Bin He, Walter Schnelle, Claudia Felser, Joseph P. Heremans, Joshua E. Goldberger
Summary: KMgBi is a quantum material that exhibits axis-dependent conduction polarity and a greatly enhanced ordinary Nernst effect (ONE). It shows a significant zero-field transverse thermoelectric response and a new type of Nernst effect.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
David R. Saykin, Camron Farhang, Erik D. Kountz, Dong Chen, Brenden R. Ortiz, Chandra Shekhar, Claudia Felser, Stephen D. Wilson, Ronny Thomale, Jing Xia, Aharon Kapitulnik
Summary: This study reports high-resolution polar Kerr effect measurements on CsV3Sb5 single crystals to search for evidence of spontaneous time-reversal symmetry breaking below the charge-order transition. Utilizing two different versions of zero-area loop Sagnac interferometers operating at 1550 nm wavelength, the researchers found no observable Kerr effect within the noise floor limit. Simultaneous coherent reflection ratio measurements confirmed the sharpness of the charge-order transition, suggesting that time-reversal symmetry is unlikely to be broken in the charge ordered state in CsV3Sb5.
PHYSICAL REVIEW LETTERS
(2023)
Article
Energy & Fuels
Tapas Samanta, Chris Taake, Laila Bondzio, Luana Caron
Summary: The nature of phase transition and the reversibility of the magnetocaloric effect have been studied in MnNi1-xCoxGe0.97Al0.03. The introduction of Al substitution lowers the structural phase transition temperature, resulting in a coupled first-order magnetostructural transition. A composition-dependent triple point has been observed in the system, where the first-order phase transition splits into an additional phase boundary with a second-order transition character at higher temperature. The reversibility of the low-field entropy change is enhanced at the triple point due to lattice softening and larger field-induced structural entropy change.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Wenhui Guo, Xuefei Miao, Jiyuan Cui, Shuki Torii, Fengjiao Qian, Yuqing Bai, Zongde Kou, Jiaju Zha, Yanyan Shao, Yujing Zhang, Feng Xu, Luana Caron
Summary: This study reports a significant improvement in the reversibility and mechanical stability of MnNiGe-based alloys through grain orientation. The oriented grains allow for synergistic deformations during the magnetostructural transition, reducing stress concentration. The textured alloys also exhibit low thermal hysteresis and a large reversible isothermal entropy change, making them attractive for practical applications.
Article
Engineering, Electrical & Electronic
Ryotaro Okabe, Mingda Li, Yuma Iwasaki, Nicolas Regnault, Claudia Felser, Masafumi Shirai, Alexander Kovacs, Thomas Schrefl, Atsufumi Hirohata
Summary: This letter summarizes the recent development of using artificial intelligence and machine learning in the search for magnetic materials, and briefly introduces the approaches used in materials discovery. The authors also provide a flowchart to assist in selecting the appropriate methods for material search. The letter also covers the authors' recent research activities in magnetism and quantum materials.
IEEE MAGNETICS LETTERS
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
