Article
Nanoscience & Nanotechnology
Mengning Xu, Na Li, Xuechao Sha, Yi Liu, Bo Gao, Lirong Xiao, Xuefei Chen, Hao Zhou
Summary: This study reports in-situ transmission electron microscopy observations on the interaction between dislocations and beta' phases in aged Mg-Gd alloys. It was found that the slipping < a > dislocations are squashed into the interface and bow out to bypass the beta' phase, resulting in a zigzag route of plastic flow. The Orowan mechanism is determined as the main strengthening mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Mariana C. M. Rodrigues, Thomas Garcin, Matthias Militzer
Summary: This study explores the potential of laser ultrasonics for metallurgy (LUMet) as an advanced in-situ technique to measure the alpha formation kinetics in a Ti-5553 alloy. Experimental observations and theoretical models based on the Johnson-Mehl-Avrami-Kolmogorov (JMAK) theory provide insights into transformation kinetics. The consistency between the partial time-temperature-transformation (TTT) diagram and in-situ measurements reaffirms the monitoring capacity of LUMet for microstructure evolution in Ti-alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Cheng Chen, Chenrong Ling, Yinjin Shao, Youwen Yang, Dongsheng Wang, Cijun Shuai
Summary: Alloying treatment with rare earth yttrium (Y) was adopted to improve the overall performance of Mg-Zn-Zr alloy, resulting in the formation of quasicrystal I-phase. Laser-processed ZW61 parts showed reduced corrosion rate and improved strength and plasticity, making them a competitive candidate for orthopedics device application.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
John Nutter, Jiahui Qi, Hussein Farahani, W. Mark Rainforth, Sybrand van der Zwaag
Summary: This study utilized in situ transmission electron microscopy to observe the growth of bainitic ferrite in Fe-0.3C-3Mn-1.5Si-0.15Mo steel at 300 degrees C. The study achieved a higher spatio-temporal resolution compared to previous studies. The growth rate of bainitic ferrite exhibited significant variations, with the highest rate exceeding 30,000 nm/s. The observations revealed both sheaves with visible sub units and individual laths during growth.
Article
Materials Science, Multidisciplinary
A. Sibirev, E. Ubyivovk, S. Belyaev, N. Resnina
Summary: This study examined the peculiarities of the movement of martensite interfaces in a NiTi alloy during the forward and reverse transformations using in situ transmission electron microscopy. The results showed that the sequence of martensite shrinking on heating was not the opposite of the sequence of martensite formation on previous cooling, and the formation sequence during the second cooling was different from the first cooling. Additionally, dislocations did not hinder martensite formation nor aid in nucleation and growth.
Article
Materials Science, Multidisciplinary
Margarita D. Bambach, Lukasz Szczepanski, Andrzej M. Zak
Summary: The conventional and in situ transmission electron microscopy imaging of quenched 1.5 pct Cu steel revealed the presence of Cu phases even before aging, which did not disappear after typical aging times. The formation of 9R precipitates was observed after 15 minutes of heating, becoming more noticeable with longer processing times. Further analysis is needed to understand the precipitation mechanisms in carbon steels, especially due to the inevitable increase in Cu content in steel ingots.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Xianhu Sun, Dongxiang Wu, Wissam A. Saidi, Wenhui Zhu, Wei-Chang D. Yang, Stephen D. House, Meng Li, Renu Sharma, Judith C. Yang, Guangwen Zhou
Summary: This study demonstrates the dynamics at the reaction fronts of multiple interfaces and reveals the control mechanisms of interfacial transformations. These findings have significant implications for controlling microstructure and interphase boundaries by manipulating surface reaction dynamics and mass transport.
Article
Materials Science, Multidisciplinary
Andi Idhil Ismail, Moukrane Dehmas, Elisabeth Aeby-Gautier, Benoit Appolaire
Summary: The phase transformation kinetics of Ti-6Al-4V alloy were investigated during rapid heating, and the study showed that the heating rate had an influence on the phase transformation behavior. Higher heating rates resulted in a higher dissolution temperature range for the α phase and a narrower temperature range for the phase transformation. The stress level and/or chemical heterogeneity in the β phase decreased with time at high temperatures. Despite the high heating rate, the dissolution kinetics of the α phase were still diffusion-controlled.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Alok Singh, Takanobu Hiroto, Machiko Ode, Hiroyuki Takakura, Karel Tesar, Hidetoshi Somekawa, Toru Hara
Summary: The precipitation of a stable quasicrystalline i-phase has been observed in a Mg-6Zn-3Al magnesium alloy, which may be the first discovery of a stable i-phase in this alloy. The dissolution of i-phase at grain boundaries leads to precipitation in the Mg-matrix during cooling. Nucleation characteristics, phase transformation, and interface morphology were investigated.
Article
Materials Science, Multidisciplinary
J. D. Robson, A. D. Smith, J. Guo, J. M. Donoghue, A. E. Davis
Summary: Competitive continuous and discontinuous precipitation (CP and DP) in magnesium alloys have been studied in-situ for the first time. The migration of the high angle grain boundary (reaction front, RF) behind which DP occurs is found to be irregular instead of steady-state. Local effects play a key role in causing the irregular motion of the RF.
Article
Nanoscience & Nanotechnology
Nan Yang, Bo-Yu Liu, Fei Liu, Zhi-Wei Shan
Summary: Deformation twinning in magnesium can undergo cross-transition, involving prismatic-basal interface migration, to broaden the understanding of twinning mechanisms.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Kaixuan Li, Yuanlin Zhuang, Ligong Zhao, Dongshan Zhao, He Zheng, Shuangfeng Jia, Ying Zhang, Peili Zhao, Jianian Gui, Jianbo Wang
Summary: The study investigated the interaction between deformation twinning and long period stacking ordered (LPSO) structures in an Mg-based alloy, showing the hindrance of LPSO structures and stacking faults to twinning. The in-situ experiments revealed that thick LPSO plates effectively retard the twinning propagation, and the closer spacing between LPSO structures further suppresses twin propagation. Additionally, the study discussed the resistance of stacking faults to twinning at the atomic scale, and the strengthening effect of LPSO structures on suppressing twinning growth.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Multidisciplinary
Fangyuan Cheng, Jie Zhang, Kui Xie
Summary: Introducing pores in single crystals creates porous materials with porosity and structural coherence. In this study, in situ transmission electron microscopy was used to reveal the formation of porosity by converting KTiOPO4 (KTP) single crystals into porous single-crystalline (PSC) TiO2 monoliths. The PSC TiO2 monoliths were formed by the movement of TiO2 clusters with identical lattice orientation on the KTP surface towards the mother phase. The relative density of the PSC TiO2 monoliths determined the porosity, while the macroscopic dimensions remained unchanged. The single-crystalline nature of the porous architecture stabilized oxygen vacancy and enhanced species diffusion. PSC TiO2 monoliths with deposited Pt clusters showed enhanced and stable catalytic CO oxidation in air at 75 degrees C for 200 hours of operation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Mingjun Yang, Andrey Orekhov, Zhi-Yi Hu, Man Feng, Shenbao Jin, Gang Sha, Kai Li, Vahid Samaee, Min Song, Yong Du, Gustaaf Van Tendeloo, Dominique Schryvers
Summary: In-situ TEM experiments revealed that coherent beta'' precipitates in Al alloys are sheared into small fragments by dislocations, while semi-coherent beta' precipitates are more difficult to be fragmented and can maintain their shape after tensile deformation.
Article
Nanoscience & Nanotechnology
Qiang Lu, Jingjing Hu, Tong Yang, Yucheng Wang, Yao Xiao, Xingwu Li, Namin Xiao, Jinsan Wang, Zhixiu Wang, Hai Li, Liya Li, Kai Li, Yong Du
Summary: In heat-resistant Al-Cu-Mg-Ag alloys, the presence of AgMg segregation layer on omega phase ensures its high thermal stability. It has been proved that an increase in Ag content can promote the precipitation of omega, even in an Al-Cu-Mg-Ag-Si alloy with a Mg/Si mass ratio around 1.7. The key point is to obtain an Ag/Mgexcess atomic ratio greater than 1 in the supersaturated solid solution. Although the fine precipitation of omega increases the total volume fraction of precipitates and yield strength, their quick coarsening at high temperature leads to a more pronounced strength loss.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Wei Cui, Qibin Song, Huhu Su, Zhiqing Yang, Rui Yang, Na Li, Xing Zhang
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2020)
Article
Nanoscience & Nanotechnology
Pingli Mao, Yan Xin, Ke Han, Zheng Liu, Zhiqing Yang
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Materials Science, Multidisciplinary
Huhu Su, Xinzhe Zhou, Shijian Zheng, Hengqiang Ye, Zhiqing Yang
Summary: The study investigated the reactions between basal dislocations and CTBs in a Mg alloy, showing that these reactions can facilitate TB migration and change the grain boundary structure. The loss of local coherency induced by dislocation-TB reactions does not inherently impede TB migration, providing a new strategy to improve the ductility of Mg alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Xiaobo Zhai, Dongsheng Lei, Meng Zhang, Jianfang Liu, Hao Wu, Yadong Yu, Lei Zhang, Gang Ren
SCIENTIFIC REPORTS
(2020)
Article
Nanoscience & Nanotechnology
Huhu Su, Xinzhe Zhou, Shijian Zheng, Di Wu, Rongshi Chen, Hengqiang Ye, Zhiqing Yang
SCRIPTA MATERIALIA
(2020)
Article
Metallurgy & Metallurgical Engineering
Meichen Liang, Hao Zhang, Lifeng Zhang, Peng Xue, Dingrui Ni, Weizhen Wang, Zongyi Ma, Hengqiang Ye, Zhiqing Yang
Summary: Microstructural evolution of Mg-based alloys during severe plastic deformation and mixing via friction stir welding was studied. The formation of a laminated onion-ring structure with significantly refined microstructures was observed in the stirred zone, leading to improved ultimate tensile strength and elongation to failure.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Huhu Su, Xinzhe Zhou, Mengmeng Zhang, Shijian Zheng, Hengqiang Ye, Zhiqing Yang
Summary: In this study, reactions of {10 (1) over bar1} twin boundaries (TBs) with slip dislocations in a Mg alloy were investigated and modeled based on atomic-resolution observations and interfacial defect theory. The reactions were found to produce asymmetric tilt grain boundaries and various types of residual dislocations, leading to modifications in local atomic structures of steps at {10 (1) over bar1} TBs. These experimental results provide insights for understanding the plastic relaxation mechanisms at {10 (1) over bar1} TBs.
Article
Multidisciplinary Sciences
Hao Qin, Chao Zhen, Chunxu Jia, Zhiqing Yang, Hengqiang Ye, Hui-Ming Cheng, Gang Liu
Summary: A new method based on gaseous thermal oxidation-nitridation-denitridation processes has been developed to prepare metal foams with adjustable pore size; the resulting metal foams demonstrate enhanced performance in electrochemical water splitting and electrochemical energy storage.
Article
Materials Science, Multidisciplinary
Xinzhe Zhou, Huhu Su, Hengqiang Ye, Zhiqing Yang
Summary: The study investigates the reactions of {10 (1) over bar2} twin boundaries with dislocations in a Mg alloy subjected to cyclic deformation through atomic-resolution observations and MD simulations. It was found that different types of dislocations exhibit different reactions with {10 (1) over bar2} twin boundaries during cyclic deformation.
Article
Engineering, Environmental
Muhua Chen, Yuping Qiu, Weizhen Wang, Xinyan Li, Jiajun Wang, He Wen, Zhiqing Yang, Ping Wang
Summary: By engineering oxygen vacancies through amorphization and foreign cation doping in iron oxide, a supported Pt catalyst on Fe-W-O amorphous nanosheets was synthesized. This catalyst demonstrated a high specific reaction rate and excellent stability during continuous testing, outperforming most existing HCHO oxidation catalysts, highlighting the importance of functional oxygen defects in constructing synergistic active sites for promoting reactions requiring multiple active species.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Multidisciplinary Sciences
Shih-Ting Wang, Brian Minevich, Jianfang Liu, Honghu Zhang, Dmytro Nykypanchuk, James Byrnes, Wu Liu, Lev Bershadsky, Qun Liu, Tong Wang, Gang Ren, Oleg Gang
Summary: The study demonstrates the creation of bio-active protein-containing ordered nanomaterials with desired 2D and 3D organizations through the encapsulation of proteins in DNA-based voxels and programmable assembly. This platform approach allows for the retention of protein function in the assembled protein arrays.
NATURE COMMUNICATIONS
(2021)
Article
Biochemistry & Molecular Biology
Hubert Lee, Nicolas Chofflet, Jianfang Liu, Shanghua Fan, Zhuoyang Lu, Martin Resua Rojas, Patrick Penndorf, Aaron O. Bailey, William K. Russell, Mischa Machius, Gang Ren, Hideto Takahashi, Gabby Rudenko
Summary: MDGAs are synaptic cell surface molecules that regulate the formation of trans-synaptic bridges between NRXNs and NLGNs, promoting synaptic development. Mutations in MDGAs are implicated in various neuropsychiatric diseases. MDGAs bind NLGNs in cis on the postsynaptic membrane and physically block their binding to NRXNs.
JOURNAL OF BIOLOGICAL CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Ewan K. S. McRae, Helena Ostergaard Rasmussen, Jianfang Liu, Andreas Boggild, Michael T. A. Nguyen, Nestor Sampedro Vallina, Thomas Boesen, Jan Skov Pedersen, Gang Ren, Cody Geary, Ebbe Sloth Andersen
Summary: RNA origami is a method for designing RNA nanostructures that can self-assemble through co-transcriptional folding. This study uses cryogenic electron microscopy to determine the structure of RNA origami sheets and bundles, revealing structural parameters and folding principles. The study also combines sheets and bundles to construct a multidomain satellite shape and characterizes its flexibility using cryo-electron tomography.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Lingli Kong, Jianfang Liu, Meng Zhang, Zhuoyang Lu, Han Xue, Amy Ren, Jiankang Liu, Jinping Li, Wai Li Ling, Gang Ren
Summary: In this study, a straightforward liquid cell technique was developed to image wet biological samples. The researchers successfully resolved subunits within the protein complex GroEL and captured various stages of virus cell entry. These findings highlight the potential of this approach in addressing biological questions at the molecular level.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yu-Ping Qiu, Wei-Zhen Wang, Mu-Hua Chen, Qing Shi, Zhi-Qing Yang, Ping Wang
Summary: This study reports the synthesis of an Ir-Ru-B/CeO2 catalyst and its intriguing properties for catalyzing N2H4・H2O decomposition. The results show that Ir-Ru alloying, B-doping, and strong metal-support interactions collectively contribute to the catalytic performance, leading to over 4-fold higher activity compared to state-of-the-art catalysts.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
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)