Article
Chemistry, Physical
Xiang Li, Qing-Zheng Jiang, Sajjad Ur Rehman, Qing-Fang Huang, You-Wei Chen, Chuan-Jia Zhao, Zhen-Chen Zhong
Summary: The addition of Nd70Cu30 significantly improves the thermal stability and magnetic properties of Ce-Fe-B-based hot-deformed magnets. The microstructure analysis shows a decrease in the proportion of coarse grain region and an increase in the proportion of the liquid region after the addition of Nd70Cu30. This leads to improved nucleation sites of magnetization reversal and weakened intergranular exchange coupling, enhancing the overall magnetic properties of the magnets.
Article
Materials Science, Ceramics
Ye Yu, Shuai Fu, Detian Wan, Yiwang Bao, Longsheng Chu, Qingguo Feng, Chunfeng Hu
Summary: Textured Nb4AlC3 ceramics were efficiently prepared by spark plasma sintering, exhibiting low thermal conductivity, high electrical conductivity, and high fracture toughness.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Nanoscience & Nanotechnology
Ronglei Fan, Yong Wu, Minghe Chen, Jie Zhao
Summary: The established model accurately predicted the anisotropic deformation behavior and the effect of dynamic recrystallization on the material properties during hot tension of TA32 titanium alloy. The transverse texture led to a higher r-value for TD tension than for RD tension, mainly due to the higher dislocation density caused by more inhomogeneous plastic deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Guoqing Dai, Jingzhe Niu, Yanhua Guo, Zhonggang Sun, Zhenhua Dan, Hui Chang, Lian Zhou
Summary: The addition of Fe in the Ti-6Al-4V-xFe alloys was found to promote grain refinement and improve the hot workability of the material during hot deformation. This was attributed to the decrease in peak stress, increase in high angle grain boundary fraction, and the facilitation of dislocation annihilation by Fe addition.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Aditya Prakash, Tawqeer Nasir Tak, Namit N. Pai, Harita Seekala, S. V. S. Narayana Murty, P. S. Phani, Sivasambu Mahesh, P. J. Guruprasad, Indradev Samajdar
Summary: Macroscopic shear bands (MSB) may form during hot working of metallic materials. The microstructural transitions between the onset of flow instability and MSB inception are not fully understood. In this study, aluminum alloy specimens were tested at different temperatures and it was found that MSB only appeared at a certain level of deformation. The formation of MSB was explained by the development of clusters of severely deforming grains and the differential dynamic recovery between hard- and soft-oriented grains.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Multidisciplinary
Tula R. Paudel, Bhubnesh Lama, Parashu Kharel
Summary: The study demonstrates the possibility of tuning magnetization and magnetocrystalline anisotropy of MnBi by alloying it with elements like Rh, Pd, Li, and O, which are stable and have larger magnetization energy product compared to MnBi. The potential development of high-energy-density magnets based on MnBi, with other favorable properties such as high Curie temperature and earth abundancy of constituent elements, is envisioned.
Article
Nanoscience & Nanotechnology
Ricardo Henrique Buzolin, Markus Masswohl, Franz Miller Branco Ferraz, Konrad Chrzan, Tomasz Dudziak, Maria Cecilia Poletti
Summary: The microstructure of hypo-eutectic high entropy alloys was modified through thermomechanical treatments at 1100°C. Electron backscattered diffraction confirmed two crystal structures: BCC and FCC. Deformation tests at different strain rates revealed that the size and fraction of BCC strongly influenced the deformation of the FCC matrix. The formation of fine BCC particles within the FCC matrix at high temperatures resulted in the pinning of high-angle grain boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Zhi Jia, Xuan Sun, Jinjin Ji, Yanjiang Wang, Baolin Wei, Lidan Yu
Summary: The high-temperature compression deformation behavior of Inconel 625 alloy was investigated through hot compression tests, revealing that the optimum condition for plastic deformation is at temperatures higher than 1050 degrees C with a strain rate of 1 to 10 s(-1). The characterization of hot compression microstructure evolution using EBSD and TEM techniques showed different dynamic recrystallization mechanisms under varying compression deformation conditions, with CDRX dominating at lower temperatures and DDRX with a bulging boundary induced by twinning dominating at higher temperatures. These findings provide a theoretical basis for optimizing the thermoplastic processing of nickel-based superalloys.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Chemistry, Physical
Jinhua Peng, Zhen Zhang, Huanhuan Chen, Chang Long, Yong Wu, Ji'an Huang, Wei Zhou, Yucheng Wu
Summary: This study systematically investigates the texture-induced anisotropy of magnesium, showing that the microstructure, texture, and mechanical properties vary with the sample direction. Different deformation mechanisms are favored by grains at different angles, with tensile and compression yield planes being fitted by linear and exponential equations, respectively. Mechanical properties and strain hardening anisotropy are discussed through comparative analyses between experimental and calculated results.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Xiao-Rong Liu, Feng He, Jun-Jie Li, Ying-Ying Dang, Zhi-Jun Wang, Jin-Cheng Wang
Summary: Hot deformation effectively tailors the hypoeutectic microstructure of CoCrFeNiNb0.25 high-entropy alloy, resulting in refined grains and uniformly distributed Laves phases, which improves its mechanical properties.
Article
Chemistry, Applied
Haijun Peng, Dunbo Yu, Xinyuan Bai, Xiao Lin, Yongjun Mao, Zilong Wang, Yang Luo
Summary: The use of high abundance rare earth element Ce in permanent magnets has attracted attention. Ce is found to improve the plastic deformation ability of NdFeB magnets, with the best c-axis orientation achieved at a Ce concentration of 0.3. Magnetic properties of the magnets were enhanced after the GBDP treatment, where Pr replacing Ce in the grains improved both magnetic performance and thermal stability.
JOURNAL OF RARE EARTHS
(2021)
Article
Materials Science, Multidisciplinary
Matruprasad Rout, Surjya K. Pal, Shiv Brat Singh
Summary: In this study, the microstructure evolution of austenitic stainless steel after deformation at elevated temperatures was investigated through thermo-mechanical processing. The results showed that at temperatures of 900 degrees C and 1000 degrees C, the microstructures of samples held for 2 seconds consisted of deformed grains, while the sample held at 1100 degrees C showed nearly complete recrystallization. The increase in holding time resulted in a decrease in low angle boundaries and an increase in high angle grain boundaries at all three temperatures.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Chemical
Yexin Jiang, Xu Wang, Zhou Li, Zhu Xiao, Xiaofei Sheng, Hongyun Jiang, Gengsheng Cai, Xianwei Zhang
Summary: The hot deformation behavior of Cu-20.0Ni-5.0Sn-0.25Zn-0.22Mn was studied, revealing that flow stress increased with increasing strain rate and decreasing temperature. The constitutive equation of the alloy was established based on the peak flow stress. Nucleation site of dynamic recrystallization generally appeared along grain boundaries.
Article
Metallurgy & Metallurgical Engineering
Dong Chen, Qian-ru Yang, Na-chuan Yang, Meng Wang, Qiang Xu, Jing-yuan Wu, Yan-bin Jiang, Zhou LI, Zhu Xiao, Hai-gen Wei
Summary: This study investigated the hot deformation behavior and microstructure of 60NiTi alloy during hot compressive deformation using the Gleeble-3500 thermal simulation test machine. The temperature range was 500-650 degrees C and the strain rate range was 0.001-1 s-1. A constitutive equation for hot compression was constructed and hot processing maps were plotted. The peak stress reduced with an increase in compression temperature or a decrease in strain rate. The hot deformation activation energy was calculated as 327.89 kJ/mol, and the appropriate hot working parameters were determined. The recrystallization degree increased with increasing compression temperature, and the Ni3Ti phase tended to aggregate with an increase in strain rate.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Chemistry, Physical
Jae Ki Lee, Ji Hui Son, SuDong Park
Summary: This study investigates the anisotropy of thermoelectric properties and microstructures in Bi2Te2.7Se0.3 fabricated by repressing. By optimizing grain orientation, carrier concentration, and temperature-dependent transport properties, high-performance thermoelectric properties were achieved. The increase in high-energy ball milling time led to reduced initial particle and grain size, affecting the degree of grain orientation during the hot deformation process.Through process optimization, a highly anisotropic figure of merit (ZT) was achieved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Applied
Jiayi He, Yukun Liu, Zhigao Yu, Jiali Cao, Hongya Yu, Zhongwu Liu
Summary: Grain boundary diffusion (GBD) is an important method for producing Nd-Fe-B magnets with high coercivity and thermal stability. This study investigated the effects of different GBD methods on the magnetic properties and microstructure of hot deformed magnets. The coercivity of the hot-deformed magnet increased after treatment by the three GBD approaches. The conventional GBD exhibited a higher utilization efficiency of Tb compared to in-situ GBD.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Applied
Bang Zhou, Yitong Liu, Songmao Li, Wenbing Fan, Xuefeng Liao, Jiayi He, Hongya Yu, Zhongwu Liu
Summary: This work investigated the magnetic properties and phase precipitation behavior of Gd2Fe14B alloys in order to utilize gadolinium (Gd) in the development and manufacturing of RE-permanent magnets. The optimal direct quenched nanocrystalline Gd2Fe14B alloy exhibited excellent magnetic properties, thermal stability, and performance stability under various processes. Gd substitution in (Y1exGdx)2Fe14B alloys significantly enhanced thermal stability and decreased irreversible remanence loss, while also improving the exchange coupling effect, corrosion resistance, and oxidation resistance. This study has important implications for designing and developing low-cost RE permanent magnets with improved thermal and environment stability.
JOURNAL OF RARE EARTHS
(2023)
Article
Materials Science, Multidisciplinary
Ke Xu, Weida Huang, Xuefeng Liao, Hongya Yu, Xichun Zhong, Zhongwu Liu
Summary: In this study, a new one-step hot deformation (HD) process was proposed for fabricating NdFeB magnets using amorphous powders. The effects of deformation ratio on the microstructure, magnetic properties, and corrosion resistance were investigated. The results showed that one-step HD process can significantly improve the properties of NdFeB magnets, and the Co element segregation has important effects on the temperature and thermal stability of the magnets.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Yixuan Han, Mukun He, Jinwen Hu, Panbo Liu, Zhongwu Liu, Zhonglei Ma, Wenbo Ju, Junwei Gu
Summary: This study successfully synthesized a magnetic microwave absorbing material (MAMs) using a hydrothermal method, and its composition and morphology were controlled by adjusting the atomic ratio. The MAMs showed enhanced microwave absorption in the C band, making it a potential solution for electromagnetic pollution in this frequency range.
Article
Materials Science, Multidisciplinary
Jinwen Hu, Sichen Liu, Yi Wang, Wenbo Ju, Na He, Jiayi He, Haoyang Jia, Chenbin Xia, Zhengsheng Huang, Jin Long, Xichun Zhong, Zhongwu Liu
Summary: In this study, flaky FeSiAl (FSA) powders were coated with an insulation layer by manganese phosphating treatment to improve the microwave absorption properties. The optimally Mn3(PO4)2 coated FSA showed excellent anti-corrosion performance with a much slower corrosion rate compared to the naked FSA particles. This work provides a low-cost phosphating process for manufacturing corrosion-resistant microwave absorbers in the widely-used X frequency band.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Computer Science, Artificial Intelligence
Amirhossein Zaji, Zheng Liu, Takashi Bando, Lihua Zhao
Summary: This article introduces a novel approach to design traffic lights in a city using evolutionary-based optimization algorithms combined with an ontology-based driving behavior simulation framework. A machine-understandable knowledge of roads, intersections, traffic rules, and driving behaviors is provided through an ontology-based knowledge base, and car behavior is inspected in real time through a simulation environment. Traffic lights are optimized by defining sine-based equations for each traffic light and considering the total travel time of vehicles as the cost function in the optimization algorithm. The results show that optimized traffic lights can significantly reduce total travel time compared to uncontrolled intersections without traffic lights.
ACM TRANSACTIONS ON INTELLIGENT SYSTEMS AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jiaming Li, Hongya Yu, Pan Luo, Han Yuan, Zhongwu Liu, Yu Wang, Lu Yang, Wenjie Wu
Summary: Amorphous soft magnetic powder cores (AMPCs) were prepared through inorganic-organic multiple-layer coating. The influence of phosphating treatment on the performance of AMPCs was investigated. The results showed that phosphoric acid-ethanol coating at relatively high temperature resulted in uniform and dense phosphate coating, leading to significantly reduced eddy current loss of the AMPCs. Optimized magnetic properties, including good frequency stability and low core loss, were achieved by coating the AMPCs with a 0.6 wt.% phosphoric acid-ethanol solution at 55 degrees C.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Pan Luo, Hongya Yu, Ce Wang, Han Yuan, Zhongwu Liu, Yu Wang, Lu Yang, Wenjie Wu
Summary: Core-shell structured amorphous FeSiBCr@phosphate/silica powders were prepared by phosphating and sodium silicate treatment, and soft magnetic composites (SMCs) were fabricated based on these powders. The properties of the powders and composites were investigated by varying phosphoric acid (H3PO4) concentration and annealing temperature. Optimum results were achieved with 0.5 wt.% H3PO4 concentration and annealing at 773 K, leading to a complete and uniform SiO2 layer formation, a double layer core-shell structure, and excellent soft magnetic properties.
Article
Materials Science, Multidisciplinary
Qintian Xie, Hongya Yu, Han Yuan, Guangze Han, Xi Chen, Zhongwu Liu
Summary: FeSiCr soft magnetic composites (SMCs) were prepared by the sol-gel method with an Al2O3/resin composite layer as the insulation coating. The Al2O3 insulation coating improved the core loss, resistivity, quality factor, and thermal conductivity of SMCs. This study provides valuable references for the design and fabrication of SMCs in high-temperature and high-frequency environments.
Article
Materials Science, Multidisciplinary
Bang Zhou, Weisen Huang, Wenbing Fan, Hongrui Zhang, Hongya Yu, Kewen Long, Zhongwu Liu
Summary: The microstructure, magnetic properties, corrosion and aging resistance, and mechanical properties of Nd-Fe-B, (Nd, La, Ce)-Fe-B, and (Ce, La, Y)-Fe-B rubber magnets were investigated. The study found that increasing the filling ratio and particle size improves the magnetic properties and tensile strength. The full high-abundance (Ce, La, Y)-Fe-B rubber magnet showed competitive advantage in performance stability.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xiangyi Liu, Jiayi He, Bin Yuan, Zhongwu Liu
Summary: Grain boundary diffusion (GBD) is an effective method to fabricate high-coercive Nd-Fe-B magnets with less consumption of heavy rare earth (HRE). However, the recently observed anti-core-shell structure in HRE diffused magnets after over-saturated diffusion reduces the beneficial effect of HRE GBD on the coercivity by accelerating the magnetization reversal of the whole magnet. Therefore, it is important to avoid the formation of anti-core-shell structure during diffusion and select appropriate diffusion time and diffusion source dosage for GBD process to obtain high-performance products and efficiently use the HRE resources.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Xichun Zhong, Yucai Wu, Yuanxin Li, Xuan Huang, Cuilan Liu, Jiaohong Huang, Zhongwu Liu, Dongling Jiao, Wanqi Qiu, Minglong Zhong, Zhenchen Zhong, R. V. Ramanujan
Summary: A novel transient liquid phase bonding (TLPB) technique was used to prepare binder-free La-Fe-Si based bulk materials by spark plasma sintering (SPS). Compared to hot-pressing sintering (HPS) samples, the SPS samples exhibited significantly higher maximum compressive strength (sigma(bc))(max) of about 637.9 MPa at a strain of 4.7%, good thermal conductivity of about 7.6 W·m(-1)·K(-1) at 300 K, and a large (-Delta S-M)(max) value of about 11.7 J·kg(-1)·K(-1) at Tc=193 K under a magnetic field change of 0 - 5 T. Thus, binder-free La-Fe-Si based bulk magnetocaloric materials with excellent properties were successfully prepared by TLPB assisted SPS technology.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Chunlong Li, Hongya Yu, Guangze Han, Zhongwu Liu
Summary: In this work, FeSiCr powders were coated with a SiO2 insulation layer for soft magnetic composites (SMCs) through the hydrolysis of elemental silicon powder. The study investigated the effects of reaction temperature and ammonia concentration on the structure and performance of SMCs. The hydrolysis process effectively reduced core loss, increased resistivity, and improved the quality factor of SMCs.
Article
Materials Science, Multidisciplinary
Zhongwu Liu
Article
Materials Science, Multidisciplinary
Haonan Zhang, Xichun Zhong, Jinwen Hu, Na He, Hanxing Xu, Xuefeng Liao, Qing Zhou, Zhongwu Liu, Raju V. Ramanujan
Summary: Flake-shaped FeSiCr (FFSC) material is a promising microwave absorbent due to its excellent magnetic properties and environmental resistance. By introducing carbon-based materials through suitable coatings, the performance of FFSC can be improved. In this study, graphite- and epoxy resin-encapsulated FFSC (FFSC@G/E) powders were prepared using a solution-blending method, exhibiting excellent performance.
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)
