Article
Chemistry, Multidisciplinary
James A. Quirk, Bin Miao, Bin Feng, Gowoon Kim, Hiromichi Ohta, Yuichi Ikuhara, Keith P. McKenna
Summary: An experimental and theoretical study of anatase grain boundaries fabricated by epitaxial growth on a bicrystalline substrate provides accurate atomic-scale models. The electronic structure in the vicinity of stoichiometric grain boundaries is relatively benign to device performance, but segregation of oxygen vacancies introduces barriers to electron transport. An intrinsically oxygen-deficient boundary exhibits charge trapping consistent with electron energy loss spectroscopy measurements.
Article
Nanoscience & Nanotechnology
Sean P. Murray, Alice Cervellon, Jonathan Cormier, Tresa M. Pollock
Summary: Research shows that fatigue crack initiation is mainly influenced by oxidation-assisted surface cracking in air, while the fatigue performance improves under vacuum due to the presence of internal casting pores. Additionally, recrystallized regions on the fracture surfaces of both alloys in the vacuum test condition have been identified, which was not previously reported for single crystal Ni-base alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Kirill A. Bokai, Viktor O. Shevelev, Dmitry Marchenko, Anna A. Makarova, Vladimir Yu Mikhailovskii, Alexei A. Zakharov, Oleg Yu Vilkov, Maxim Krivenkov, Denis V. Vyalikh, Dmitry Yu Usachov
Summary: Intercalation of oxygen can facilitate the detection of grain boundaries in polycrystalline graphene, providing insights into their morphology, and enabling visualization through various electron microscopy methods.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Sung Bo Lee, Seung Jo Yoo, Jinwook Jung, Heung Nam Han
Summary: The irradiation of high-energy particles can affect the grain-boundary structure of polycrystalline nuclear materials, with different reactions observed for different grain-boundary characteristics. By examining different types of grain boundaries in a model system, it was found that tilt boundaries became roughened while twist boundaries became faceted under the same irradiation conditions.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Multidisciplinary
Kunyen Liao, Kiyou Shibata, Teruyasu Mizoguchi
Summary: Grain boundaries significantly affect the coefficient of thermal expansion in polycrystals. This study used EELS to directly measure CTE in different types of grain boundaries, revealing variations in thermodynamic properties and demonstrating the potential of EELS for probing local thermal properties at nanometer-scale resolution.
Article
Materials Science, Multidisciplinary
Xiaochen Li, Haibo Long, Jianfei Zhang, Dongfeng Ma, Deli Kong, Yan Lu, Shiduo Sun, Jixiang Cai, Xiaodong Wang, Lihua Wang, Shengcheng Mao
Summary: This study used in situ TEM observations to directly reveal dislocation nucleation at grain boundaries in nanocrystalline metals. The findings contradict the common hypothesis predicted by molecular dynamic simulations, showing that complete dislocations can be emitted from grain boundaries in small-grained structures.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
D. F. Shi, Z. J. Zhang, Y. H. Yang, Y. Z. Zhou, R. Liu, P. Zhang, Z. F. Zhang
Summary: Nickel-based single-crystal superalloys are widely used in manufacturing aeroengine turbine vanes due to their excellent high-temperature performance. However, the presence of low-angle grain boundaries (LAGBs) during their manufacture can weaken the mechanical properties of the superalloys. In this study, the relationship between grain boundary misorientation (GBM) and fatigue properties of superalloys at elevated temperatures was systematically investigated using six different bicrystals with varying tilt LAGBs. The study found that an increase in GBM led to an increase in GB precipitates and cast micropores, resulting in a decrease in fatigue life and fatigue strength. The study also established a quantitative fatigue strength prediction model and evaluated the coupling effect of cast micropores and GBM on the fatigue damage mechanisms of the bicrystals.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Qi Zhu, Qishan Huang, Haofei Zhou, Jiangwei Wang
Summary: This study reveals the fundamental influences of GB inclination on the deformation of curved dislocation-type GBs in face-centered cubic metals through in situ TEM nanomechanical testing and atomistic simulation. A inclination-governed GB model is established to predict the deformation behaviors of curved GBs, shedding light on the GB-mediated plasticity and the structural design of metallic materials.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Mingyue Wen, Yuan Sun, Jinjiang Yu, Shulin Yang, Xingyu Hou, Yanhong Yang, Xiaofeng Sun, YiZhou Zhou
Summary: By regulating the cooling rates of pre-weld heat treatments, the effects of microstructures of grain boundaries in the prototype M951 superalloy were investigated to improve its weldability and reduce the occurrence of weld cracks. Engineering the grain boundaries in the M951 superalloy with a low cooling rate favored the formation of continuous liquid films on the grain boundaries, significantly preventing the formation of weld cracks.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Artem M. Abakumov, Chen Li, Anton Boev, Dmitry A. Aksyonov, Aleksandra A. Savina, Tatiana A. Abakumova, Gustaaf Van Tendeloo, Sara Bals
Summary: High-energy lithium-rich layered transition metal oxides exhibit complex electrochemical behavior due to interactions between crystal, electronic, and defect structures. This study reveals that grain boundary microstructures, particularly Na-enriched regions, have a significant impact on the rate capability of Li-rich cathodes, affecting the diffusion of Li+ ions.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
R. Malacarne, S. Mathieu, L. Aranda, M. Vilasi, C. Desgranges, S. Knittel
Summary: Chromia forming Alloy 718 and AD730TM were subjected to isothermal long-term air exposure at 700 degrees C for up to 10,000 hours. The study found that intergranular oxidation contributes around 30% to the total specific mass change. AD730TM exhibited a twofold faster oxidation rate compared to Alloy718, indicating the need for even longer tests to confirm the results.
Article
Nanoscience & Nanotechnology
Seiichiro Ii, Takero Enami, Takahito Ohmura, Sadahiro Tsurekawa
Summary: TEM in situ straining was used to investigate the slip behavior at grain boundaries in an aluminum bicrystal. The shear stress required for dislocation transfer at the grain boundary was evaluated and it was found that the activated slip system in the adjacent grain is primarily controlled by local energetic and geometric conditions.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Seiichiro Ii, Takero Enami, Takahito Ohmura, Sadahiro Tsurekawa
Summary: TEM in situ straining was used to study an Al bicrystal with a {111} sigma 3 grain boundary. The activated slip systems and resolved shear stress were determined, and the relationship between grain boundary dislocations and pile-up dislocations was observed.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Xueqiao Li, Yinong Liu, Yunsong Zhao, Yanhui Chen, Ang Li, Jianfei Zhang, Yadi Zhai, Zhipeng Li, Dongfeng Ma, Xiaochen Li, Qing Zhang, Xiaomeng Yang, Haibo Long, Shengcheng Mao, Ze Zhang, Xiaodong Han
Summary: This study investigates the oxidation and fracture behaviors of a thin Ni-based single crystal superalloy component at 650 degrees C under stress using an in-situ thermal-stress environmental transmission electron microscope. It was found that in-situ oxidation changed the tensile fracture mode from plastic fracture on {111} planes to brittle fracture on {001} planes adjacent to the gamma/gamma interfaces. Microanalysis also revealed different oxidation behaviors of gamma ' cuboids, gamma phase, and gamma/gamma interface, highlighting the thickness debit effect.
MATERIALS RESEARCH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Yizhong Guo, Jiao Teng, Guo Yang, Ang Li, Yao Deng, Chengpeng Yang, Lihua Wang, Xin Yan, Ze Zhang, Xiaoyan Li, En Ma, Xiaodong Han
Summary: Detailed monitoring of atomic-scale processes is crucial for understanding grain rotation in nanocrystalline metals. In this study, in situ atomic-resolution evidence reveals that the type of grain boundary plays a role in the atomic processes involved in grain rotation in nanocrystalline Pt. General GBs exhibit a combination of dislocation activities and atomic rearrangements, while tilt GBs mostly rely on dislocation activities. GB dislocation climb, glide, and reaction are often associated with Lomer-like dislocation formation and destruction.
Article
Multidisciplinary Sciences
So-Yeon Lee, Kyung Ryoul Park, Sung-Gyu Kang, Ji-Hoon Lee, Eun-chae Jeon, Cheol-Hwee Shim, Jae-Pyoung Ahn, Dong-Ik Kim, Heung Nam Han, Young-Chang Joo, Changsoon Kim, In-Suk Choi
NATURE COMMUNICATIONS
(2019)
Article
Chemistry, Physical
Seung-Yong Lee, Byung-Kyu Kim, Sang-Hyeok Lee, Dong-Ik Kim, Jae-Hyeok Shim, Woo-Sang Jung, Jin-Yoo Suh
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Materials Science, Ceramics
Sang-Soon Lim, Sung-Jin Jung, Byung Kyu Kim, Dong-Ik Kim, Byeong-Hyeon Lee, Sung Ok Won, Joonchul Shin, Hyung-Ho Park, Seong Keun Kim, Jin-Sang Kim, Seung-Hyub Baek
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Multidisciplinary
Amol B. Kale, Byung-Kyu Kim, Dong-Ik Kim, E. G. Castle, M. Reece, Shi-Hoon Choi
MATERIALS CHARACTERIZATION
(2020)
Article
Chemistry, Physical
Aeran Roh, Daeyoung Kim, Seungjin Nam, Dong-Ik Kim, Han-Yeol Kim, Kee-Ahn Lee, Hyunjoo Choi, Jae-Hun Kim
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Materials Science, Multidisciplinary
Amol B. Kale, Jaiveer Singh, Byung-Kyu Kim, Dong-Ik Kim, Shi-Hoon Choi
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
Article
Nanoscience & Nanotechnology
Min-Seong Kim, Ki-Seong Park, Dong-Ik Kim, Jin-Yoo Suh, Jae-Hyeok Shim, Kyung Tae Hong, Shi-Hoon Choi
Summary: A multi-layered plate composed of high-Cr martensitic stainless steel with robust interfacial strength was produced through repetitive hot roll bonding at elevated temperature. The carbon content fluctuated along the thickness direction, and the multi-layered composite structure exhibited an effective combination of strength and ductility. Strong bonding at each interface was confirmed through tensile testing with in-situ observation during deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Taejun Ha, Sang-In Lee, Jihyun Hong, Young-Su Lee, Dong-Ik Kim, Jin-Yoo Suh, Young Whan Cho, Byeongchul Hwang, Joonho Lee, Jae-Hyeok Shim
Summary: The microstructure and hydrogen storage properties of as-cast and annealed TiFe-6 wt % ZrCr2 alloy samples were investigated. Both samples exhibited three phases, with the amount of TiFe2 significantly reduced and fragmented in the annealed sample. Both samples were able to be hydrogenated under 31 bar of hydrogen at room temperature, with the annealed sample requiring an incubation period of around 40 hours.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Jeong-Min Park, Yakai Zhao, Thomas Voisin, Dong-Hyun Lee, Shin-ichi Komazaki, Yoonseok Ko, Dong-Ik Kim, Jin-Yoo Suh, Heung Nam Han, Y. Morris Wang, Upadrasta Ramamurty, Jae-il Jang
Summary: The effect of hydrogen charging on the nanoindentation response of a selective laser melted 316L austenitic stainless steel was investigated. Results showed that the hardness increment due to hydrogen charging in SLM samples was relatively smaller compared to conventionally manufactured samples. The study also found that the charged SLM alloy had a lower hydrogen content and apparent hydrogen diffusivity, attributed to the ultrafine solidification cell structure in the SLM alloy. Additionally, the cell walls in the SLM alloy were relatively insensitive to hydrogen charging compared to the cell interiors.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Han-Jin Kim, Jihye Park, Young-Su Ji, Byung Moon Jeong, Jingak Nam, Min-Gu Jo, Joonho Lee, Dong-Ik Kim, Jin-Yoo Suh, Jae-Hyeok Shim
Summary: The study reports the investigation into the frequent failures of ethylene furnace radiant tubes at a petrochemical plant, with focus on the formation of intermetallic compounds and carbides between different metals at the welding interface as the main cause. Further analysis revealed enhanced diffusion of Al leading to early-stage precipitation of NiAl intermetallic phase at the weld interface, explaining the premature failures in the petrochemical plant.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Sang-In Lee, Taejun Ha, Young-Su Lee, Dong-Ik Kim, Jin-Yoo Suh, Young Whan Cho, Byoungchul Hwang, Joonho Lee, Jae-Hyeok Shim
Summary: The microstructural characteristics of AB-type TiFe hydrogen storage alloys with Zr or ZrCr2 were investigated using EBSD analysis, revealing the presence of TiFe, TiFe2, and Ti2Fe phases. The addition of Zr or ZrCr2 facilitated hydrogenation under 30 bar of hydrogen at room temperature, with TiFeZr alloy showing faster kinetics due to finer grain size of TiFe2 phase.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Lalit Kaushik, Jaiveer Singh, Joo-Hee Kang, Yoon Seok Ko, Dong-Ik Kim, Jin-Yoo Suh, Shi-Hoon Choi
Summary: In low stacking fault energy (SFE) materials, the occurrence of multiple generations of annealing twins (MGAT) leads to significant texture weakening and the evolution of new texture components. Investigating the twin clusters and potential nucleation sites of MGAT provides insights into their contribution to texture development.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Byung Kyu Kim, Yoon Seok Ko, In-Ho Jung, Heung Nam Han, Kyung-Woo Yi, Dong-Ik Kim
Summary: The effects of alloy grain size on high-Cr ferritic stainless steel were investigated using different thicknesses of samples. The larger-grained plate sample showed a 41% reduction in oxidation rate, while the smaller-grained sheet sample exhibited a slight decrease in Cr volatilization. Numerical simulation indicated that the inhomogeneous GB-related oxidation is the major cause of the different oxidation kinetics affected by metal grain size.
Article
Surgery
Ki-Sang Jung, Seon-Hee Heo, Shin-Young Woo, Yang-Jin Park, Dong-Ik Kim, Young-Wook Kim
Summary: This study aimed to determine factors associated with long-term graft patency after lower extremity arterial bypass (LEAB) by retrospectively reviewing a database of LEABs for patients with chronic arterial occlusive disease (CAOD) at a single institution. The findings suggest that hypertension, claudication, no prior intervention, vein graft, above-the knee bypass, and graft salvage procedures are independent factors influencing long-term patency after LEAB. These factors may be considered in decision making before treating patients with CAOD.
ANNALS OF SURGICAL TREATMENT AND RESEARCH
(2021)
Article
Surgery
Byeoung-Hoon Chung, Seon-Hee Heo, Yang-Jin Park, Dong-Ik Kim, Duk-Kyoung Kim, Young-Wook Kim
ANNALS OF SURGICAL TREATMENT AND RESEARCH
(2020)
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)
