Article
Nanoscience & Nanotechnology
Lixin Meng, Wenqi Li, Quanxin Shi, Liuwei Zheng, Jinyao Ma, Lei Yin, Wei Liang, Huihu Lu
Summary: The study compares the application of Q&T and Q&P processes on AISI 430 ferritic stainless steel and evaluates the selection of the optimal interrupted quenching temperature. The functional relationship between the microstructure and quenching temperature is qualitatively and quantitatively analyzed through experiments and theoretical calculations. The diffusion behavior of carbon and its effect on mechanical properties are discussed. The results show that quenching at 160 degrees C provides superior tensile properties with the highest product of strength and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Gaurav Kumar, Sumit Ghosh, Sakari Pallaspuro, Mahesh C. Somani, Jukka K. Komi, Sushil A. Mishra, Amol Gokhale
Summary: This study presents an improved balance of strength and fracture toughness in a Si-containing 0.2%C steel, achieved by employing thermo-mechanical rolling followed by direct quenching and partitioning to obtain a refined martensitic matrix and evenly distributed and finely divided retained austenite. The results demonstrate that this microstructure can enhance fracture toughness without sacrificing strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
A. Sierra-Soraluce, G. Li, M. J. Santofimia, J. M. Molina-Aldareguia, A. Smith, M. Muratori, I. Sabirov
Summary: This article investigates the effect of chemistry and heat treatment parameters on the microstructure and properties of Q&P treated martensitic stainless steels. It is demonstrated that these steels show a good combination of enhanced strength and sufficient tensile ductility, with the ability of the martensitic matrix to accumulate plastic deformation playing an important role. The relationship between the Q&P process, microstructure, and properties is discussed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
B. B. He, S. Pan
Summary: Increasing austenite stability through Mn alloying effectively suppresses martensitic transformation in medium Mn steel, resulting in higher nanohardness for large austenite grains. Despite grain boundary strengthening, the nanohardness of ferrite remains lower than that of austenite grains. The intrinsic nanohardness of austenite found in this study can provide valuable input parameters for modeling high strength steels with retained austenite.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Ji Hoon Kim, Guiyoung Gu, Minseo Koo, Eun-Young Kim, Jae-Sang Lee, Dong-Woo Suh
Summary: In this study, nano-sized austenite particles were produced in as-quenched martensite, improving the tensile properties of advanced high strength steel. The highly stable austenite particles with a persistent TRIP effect contribute to a remarkable improvement in tensile ductility without compromising tensile strength.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
A. Sierra-Soraluce, G. Li, M. J. Santofimia, J. M. Molina-Aldareguia, A. Smith, M. Muratori, I. Sabirov
Summary: This study examines the high cycle fatigue behavior of quenching and partitioning (Q & P) treated martensitic stainless steels. The results show satisfactory high cycle fatigue performance in these materials, surpassing traditional counterparts. Fatigue cracks predominantly form and propagate along martensite packet and block boundaries, while prior austenite grain boundaries and inclusions have minimal influence on fatigue crack formation and growth.
MATERIALS & DESIGN
(2023)
Article
Metallurgy & Metallurgical Engineering
Shuai Wang, Jie Li, Li-yang Zeng, Xun-wei Zuo, Nai-lu Chen, Yong-hua Rong
Summary: This study developed a Gaussian process regression model in machine learning to predict the volume fraction of metastable retained austenite (V-RA) in quenching and partitioning (Q&P) steels. The accuracy of the model was further improved by introducing a metallurgical parameter and combining it with a Bayesian global optimization method for selecting the quenching temperature. The developed machine learning model showed better accuracy in predicting V-RA compared to other popular models.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Chao Zhang, Zhiping Xiong, Dezhen Yang, Xingwang Cheng
Summary: The study proposes a new Q&P process that introduces heterogeneous austenite to achieve high-strength steel production with good global and local formability.
Article
Nanoscience & Nanotechnology
Lassi Raami, Pasi Peura
Summary: The modern steel industry is interested in developing new high-strength steels, especially for the automotive industry. The need for stronger and more ductile sheet steels has led to the development of novel heat treatments like quenching and partitioning. However, limited research has been conducted on the microstructure evolution of alloys potential for quenching and partitioning, such as stainless steels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Tjerk Koopmans, Jilt Sietsma, Lie Zhao, Maria J. Santofimia
Summary: The quenching and partitioning process aims at creating steel microstructures composed of martensite and retained austenite. Experimental results show that the decomposition of retained austenite upon reheating occurs in two stages with a relatively low heating rate, and increasing the partitioning time can significantly improve the thermal stability of retained austenite.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Zheng Li, Kejian Li, Chengkai Qian, Dexin Wang, Wen Ji, Yao Wu, Zhipeng Cai, Qu Liu
Summary: High-intensity pulsed magnetic field was used to modify the microstructure of quenched 8Cr4Mo4V bearing steel under cryogenic conditions. The results showed that deep cryogenic treatment promotes the transformation from retained austenite to martensite, while coupling high-intensity magnetic field with deep cryogenic treatment inhibits this phase transformation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Kai Yang, Yu Li, Zhenjun Hong, Shaofeng Du, Tao Ma, Shilong Liu, Xuejun Jin
Summary: The study showed that the stability of metastable retained austenite in Q&P steel samples is influenced by carbon content, grain size/morphology, and stress shielding effects. The martensite transformation has a dual effect on dynamic impact properties, depending on the transformation mechanism and temperature. The QP120 sample achieved an excellent combination of mechanical properties due to the stability of the film gamma(M) during tensile and impact tests.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Sumit Ghosh, Pentti Kaikkonen, Vahid Javaheri, Antti Kaijalainen, Ilkka Miettunen, Mahesh Somani, Jukka Komi, Sakari Pallaspuro
Summary: The novel processing concept of direct quenching and partitioning (DQ & P) was explored in a medium-carbon steel to evaluate and optimize the processing route for excellent property combinations. Physical simulation studies were conducted to understand the influence of varying silicon contents and processing parameters on microstructural development. The optimized parameters were used to design a processing route for laboratory trials, aiming to produce ultrahigh-strength structural steels with desired mechanical properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Multidisciplinary Sciences
A. Inam, M. A. Hafeez, M. Atif, M. Ishtiaq, M. H. Hassan, T. Hussain, M. S. Mughal, M. A. Raza, M. A. Q. Abbas, I Ullah
Summary: This study investigates the effects of C and Mn partitioning on microstructure, mechanical, and electrochemical properties of experimental 3 wt% Mn steel during quenching and partitioning heat-treatment process. Different partitioning time periods resulted in varying volume fractions of martensite and retained austenite phases, with the formation of epsilon carbides. The optimal combination of increased hardness and impact toughness was achieved with a partitioning period of 90 seconds, along with improved corrosion resistance in a 3 wt% NaCl solution.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Yuming Zou, Qihan Gao, Hua Ding, Yu Zhang, Zhengyou Tang
Summary: This study investigates the characteristics of martensitic transformation in medium Mn steel under different strain states and proposes a strain state dependent α'-martensitic transformation kinetics law, which provides a reasonable prediction for the transformation behavior of medium Mn steel.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Felix Sajadi, Jan-Marc Tiemann, Nooshin Bandari, Ali Cheloee Darabi, Javad Mola, Siegfried Schmauder
Summary: By heat treatment, AlSi10Mg alloy can eliminate anisotropic features, increase hardness, and improve fatigue strength. The study found that under heat-treated conditions, the alloy's yield strength and ductility simultaneously increased, while a more ductile fracture mechanism occurred.
Article
Materials Science, Multidisciplinary
Javad Mola, Guoqing Luan, Qiuliang Huang, Christiane Ullrich, Olena Volkova, Yuri Estrin
Summary: Discontinuous plastic flow due to dynamic strain aging in a Fe-13Cr-3.4Mn-0.47C metastable stainless steel was studied, with different mechanisms proposed for different temperature intervals. The study identified deformation-induced martensitic transformation and carbon diffusion as key processes in DSA at various temperatures.
Article
Metallurgy & Metallurgical Engineering
Lian-yu Wang, Ze-yi Liu, Ming He, Xiao-ming Liu, Masamichi Sano, Li-jia Zhao, Qiang Wang
Summary: The study found that using a forward-reverse rotating electromagnetic field for bubble refinement can suppress the central vortex formation, enhance bubble refinement, and avoid the introduction of non-metallic inclusions caused by intrusive configuration.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2022)
Article
Engineering, Chemical
Lianyu Wang, Zeyi Liu, Ji Qi, Ming He, Masamichi Sano, Xiaoming Liu, Lijia Zhao, Qiang Wang
Summary: Bubble refinement is crucial for improving the efficiency of gas-liquid interaction in industrial processes, and the novel rotating flow design allows for bubble refinement without invasive parts. The velocity gradient generated by the rotating flow causes bubbles to break, leading to an increase in bubble number and a decrease in average bubble diameter.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Meng Dong, Tie Liu, Xiaoyu Guo, Shulin Dong, Lei Li, Jun Wang, Jinshan Li, Lijia Zhao, Qiang Wang
Summary: Through experiments, we found that it is possible to adjust the preparation parameters of an alloy to achieve preferred crystal orientations parallel to the magnetic field for different phases in the alloy under high magnetic fields. The magnetic torque induces rotation of the crystal, affecting the orientation of different phases in the alloy.
MATERIALS CHARACTERIZATION
(2022)
Editorial Material
Materials Science, Multidisciplinary
Lijia Zhao, John G. Speer, Peter Hodgson, Nobuhiro Tsuji
FRONTIERS IN MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Guanghui Chen, Reza Rahimi, Michael Harwarth, Mykhaylo Motylenko, Guang Xu, Horst Biermann, Javad Mola
Summary: This study investigated the crystallographic orientation relationship between M23C6 carbides and austenite in lightweight high carbon stainless steel. The findings showed an orientation relationship approximated by the Kurdjumov-Sachs (K-S) orientation relationship between the carbides and the austenitic matrix, deviating from the commonly reported cube-on-cube orientation relationship, which could be explained by the formation of M23C6 carbides via M7C3 carbides as an intermediate phase.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Lawrence Cho, Anastasiya Tselikova, Kelsey Holtgrewe, Emmanuel De Moor, Rolf Schmidt, Kip O. Findley
Summary: This paper discusses the importance of toughness and fatigue resistance in welds and HAZs of high-strength steels for structural applications. It explores the transformation characteristics of acicular ferrite in relation to alloying and weld processing, and highlights the specific role of acicular ferrite in weld performance. The paper also identifies the need for future research to identify suitable weld processes for specific alloying strategies.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Steffen Scherbring, Guanghui Chen, Bastian Veltel, Gert Bartzsch, Julia Richter, Malte Vollmer, Malte Blankenburg, Saikat Shyamal, Olena Volkova, Thomas Niendorf, Ulrich Lienert, Puspendu Sahu, Javad Mola
Summary: Adding aluminum to stainless steel can improve its performance, particularly in terms of increasing yield strength, as observed in this study on the influence of aluminum addition on microstructure and mechanical properties.
Article
Chemistry, Multidisciplinary
Hao Gao, Lijia Zhao, Li Li, Songyuan Wu, Zhiqing Lin, Qiang Wang
Summary: This study examines the influence of worn surfaces on the stick-slip friction of galvanized automotive steel and reveals the role of surface topography parameters in such friction. It suggests that increasing the surface deformation can suppress the stick-slip friction by reducing the difference between static and kinetic friction coefficients. The findings can improve the understanding of stick-slip friction mechanisms and provide a method to reduce noise and vibration caused by the friction.
Article
Nanoscience & Nanotechnology
Guanghui Chen, Guang Xu, Horst Biermann, Javad Mola
Summary: The effects of Co and Co + Al addition on the microstructure, deformation-induced processes, and mechanical properties of a wrought Fe-14Cr-9Ni-3Mn-0.3C austenitic stainless steel were investigated. Co and Co + Al additions have noticeable impacts on the mechanical properties, particularly on the work hardening rate and the suppression of α'-martensite.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Qiuliang Huang, Christiane Ullrich, Javad Mola, Mykhaylo Motylenko, Lutz Krueger, Olena Volkova, Andreas Weiss, Marco Wendler
Summary: This study presents a systematic investigation on the quenching and partitioning processing of a (C + N)-containing austenitic stainless steel and compares it with C-containing Q & P-treated stainless steels. The influence of partitioning conditions on the mechanical properties is analyzed. It is found that the mechanical properties depend on the interstitial partitioning between martensite and austenite, and the optimal mechanical properties are obtained after partitioning at 450°C for 3 minutes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
D. Bhattacharya, L. Cho, J. Colburn, D. Smith, D. Marshall, E. van der Aa, A. Pichler, H. Ghassemi-Armaki, N. Pottore, K. O. Findley, J. G. Speer
Summary: This work investigates the influence of selected alloying variations on Zn-assisted liquid metal embrittlement (LME) susceptibility of Zn-coated advanced high strength steels (AHSS). The study reveals that the Si content of AHSS is strongly correlated with Zn-LME susceptibility, and Si suppresses the formation of Fe-Zn intermetallic phases at the coating-substrate interface.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Hao Gao, Lijia Zhao, Li Li, Zhiqing Lin, Shaolong Sheng, Qiang Wang
Summary: Stick-slip behavior between friction pairs can cause severe vibration problems, leading to material loss and health deterioration. This study investigates the scale effect of surface asperities on the stick-slip behavior using zinc-coated steels with multiscale surface asperities. It is found that the stick-slip behavior is dominated by the density of small-scale asperities, and decreasing this density can significantly suppress the stick-slip behavior. This research provides insights for tailoring surface topography to mitigate stick-slip behavior in various materials.
Article
Materials Science, Multidisciplinary
Hao Gao, Lijia Zhao, Songyuan Wu, Li Li, Shaolong Sheng, Tie Liu, Qiang Wang
Summary: This study investigated the key factors influencing the stick-slip behavior of polymer/metal through experiments at varying temperatures. It was found that the friction behavior and interfacial interaction are temperature-dependent. The transition in interfacial interaction from adhesion to plastic deformation with increased temperature is responsible for the reduction in stick-slip intensity.
MATERIALS & DESIGN
(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)
