Article
Materials Science, Multidisciplinary
A. Lindsay Greer, Miguel B. Costa, Owain S. Houghton
Summary: There have been remarkable advances in the field of metallic glasses over the last 50 years, including an expanded range of compositions, improved production and shaping techniques, and the discovery of property combinations offering unparalleled performance. Ongoing research continues to provide fundamental insights into the structure and properties of glasses and liquids. This article focuses on the latest advances in understanding and the rapidly expanding prospects for applications.
Article
Engineering, Mechanical
Wei-Hui Lin, Chong-Min She, Chun-Yu Zhang, Paulo S. Branicio, Zhen - Dong Sha
Summary: The mechanical properties of cellular metallic glasses are influenced by the shape of their cellular structures. Random structures with uniform porosity show higher yield strength and Young's modulus compared to microlattice structures. The chiral structure displays the highest Young's modulus, while stochastic cellular structures exhibit higher energy absorption capacity.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Multidisciplinary Sciences
Yao Tang, Haofei Zhou, Haiming Lu, Xiaodong Wang, Qingping Cao, Dongxian Zhang, Wei Yang, Jian-Zhong Jiang
Summary: By adjusting processing conditions, controllable structural gradients can be designed in bulk metallic glasses, resulting in enhanced plasticity and suppression of shear localization.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yuhang Zhang, Yuehui Xian, Jiejie Li, Suhang Ding, Sheng Liu, Re Xia
Summary: Nanoporous metallic glasses (NPMGs) exhibit a combination of superior properties of metallic glasses and porous structures. This study uses molecular dynamics simulations to investigate the mechanical behaviors and deformation processes of 3D NPMGs with diamond and gyroid structures. The results show that the mechanical behaviors of NPMGs depend on relative density and ligament size, and a tension-compression asymmetry is observed due to surface effects.
MATERIALS TODAY COMMUNICATIONS
(2021)
Review
Chemistry, Physical
Yu Chen, Zheng-Wei Dai, Jian-Zhong Jiang
Summary: Metallic glasses and high entropy alloys have shown remarkable features but also have issues. Recent efforts have been made to address these problems by introducing new concepts and mechanisms. High entropy metallic glasses, combining the advantages of both, have become a research focus.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yuan-Yun Zhao, Feng Qian, Wenfeng Shen, Chengliang Zhao, Jianguo Wang, Chunxiao Xie, Fengling Zhou, Chuntao Chang, Yanjun Li
Summary: The approach of synthesizing metal and alloy nanoparticles by ultrasound-assisted dealloying of metallic glasses without the use of reducing agents and surfactants simplifies the up-scaling synthesis process. The formation mechanism involves the glass-liquid phase transition and ultrasound-driven ligament-breakage effects. This method provides a general strategy for synthesizing unprecedented multimetallic nanoparticles.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Yuman Shao, Weijie Zheng, Wei Guo, Shulin Lu, Shusen Wu
Summary: In situ Fe-rich particles reinforced Mg-based metallic glass matrix composites were fabricated successfully using a dealloying reaction in metallic melt, showing improved fracture strength and plastic strain. The Fe-rich particles hindered the rapid propagation of main shear bands, leading to stopping, branching, and multiplication of them.
Article
Chemistry, Physical
A. H. Cai, G. Zhou, P. W. Li, D. W. Ding, Q. An, G. J. Zhou, Q. Yang, Y. P. Lin, H. Mao
Summary: The relationship between microstructure and mechanical property of three Zr-based bulk metallic glasses (BMGs) was investigated. The results show that the content of CuZr2-type phase increases but that of Zr6Al2Ni-type phase decreases with increasing Zr content. The plastic flow stress and strain decrease while the plasticity increases with increasing fraction of CuZr2-type cluster, which is named as geometrically unfavorable motifs (GUMs). The fitting parameters from cumulative probability statistics provide valuable clues for investigating the plastic flow and plasticity of the BMGs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Jing Wang, Zhibin Li, Rui Li, Hui Wang, Yuan Wu, Xiongjun Liu, Zhaoping Lu
Summary: Nanoporous metals, characterized by high surface area, unique pore size distribution, and enhanced catalytic activity, have emerged as a new class of functional materials. This review paper summarizes recent advances in the fabrication, structural regulation, and functional applications of nanoporous metals and their composites through the dealloying of metallic glasses. Factors affecting the nanoporous structure, preparation of immiscible nanoporous metals, and control of hierarchical nanoporous structures are discussed. The paper also provides an overview of the current situation, challenges, and potential research directions in this field.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Chemistry, Physical
Changshan Zhou, Hezhi Zhang, Xudong Yuan, Kaikai Song, Dan Liu
Summary: This study validates the applicability of pre-plastic deformation (PPD) on bulk metallic glasses (BMGs) with different Poisson's ratios. It is found that PPD treatment can effectively produce multiple shear bands in BMGs with high Poisson's ratios, leading to improved strength and plasticity. However, for BMGs with low Poisson's ratios, PPD treatment results in only a few shear bands and micro-cracks, leading to worsening mechanical properties. Furthermore, among the PPD-treated BMGs with similar high Poisson's ratios, Zr56Co28Al16 BMG exhibits larger plasticity due to the presence of more defective icosahedral clusters, which serve as nucleation sites for shear transformation zones (STZs) during deformation.
Article
Materials Science, Multidisciplinary
Keita Nomoto, Anna Ceguerra, Christoph Gammer, Bosong Li, Huma Bilal, Anton Hohenwarter, Bernd Gludovatz, Jurgen Eckert, Simon P. Ringer, Jamie J. Kruzic
Summary: The study revealed the hierarchical structure of BMGs through nanobeam electron diffraction experiments, showing that the local hardness of microscale domains decreases with the size and volume fraction of atomic clusters with higher local MRO. A model of ductile phase softening was proposed to enable the design of BMGs in the future by tuning the MRO size and distribution in the nanostructure.
Article
Materials Science, Multidisciplinary
Rongjie Xue, Linzhi Zhao, Jiaojiao Yi
Summary: In cyclic tensile creep experiments at a constant temperature, strain deformation in metallic glasses accelerates structural relaxation by causing the shrinkage and annihilation of flow units. This has a significant negative impact on the beta-relaxation behavior and relaxation enthalpy, leading to an aging phenomenon, indicating a close correlation with the inhomogeneous microstructure and potential defects of flow units.
Article
Materials Science, Multidisciplinary
Chang Liu, Suyue Yuan, Jinwoo Im, Felipe P. J. de Barros, Sami F. Masri, Paulo S. Branicio
Summary: Molecular dynamics simulations are used to investigate the mechanical properties of nanoporous CuxZr1-x metallic glasses. The study reveals a strong correlation between Young's modulus, Ultimate Tensile Strength (UTS), and porosity/composition. Increasing porosity leads to a change in nanoporous topology and a transition from brittle to ductile deformation and failure mechanisms. Genetic Programming (GP) is employed to establish scaling laws for E and UTS as a function of porosity and composition, accurately predicting their values in the entire range considered.
Article
Nanoscience & Nanotechnology
Jiazi Bi, Xinquan Wei, Xiaobin Liu, Ran Li, Ruijuan Xiao, Tao Zhang
Summary: A family of novel Os-Co-Ta-B high-temperature bulk metallic glasses (HTBMGs) with high glass transition temperature, Vickers microhardness, and compressive strength was fabricated by introducing high-modulus refractory metal Os and strong-covalent metalloid B. The impressive strength is attributed to the strong bond characteristics especially for Ta-Os and B-B bonds. The castable OsCo-based HTBMGs with superior mechanical properties and high thermal stabilities are significant for high-temperature applications as advanced structural materials.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Environmental
Man Li, Jiangyun Liu, Chaoyang Wang, Yang Liu, Yuntao Sun, Chunling Qin, Zhifeng Wang, Yongyan Li, Li Liu, Shuming Liu
Summary: The controllable nanoporous copper (NPC) ribbons synthesized from metallic glasses provide insights into how the corrosion potential of additional elements can influence the pore/ligament size of nanoporous metals (NPMs). The design of NPMs with useful pore size is made more feasible through new findings rooted in the inherent nature of additional elements. The interaction between NPC and MnO2 results in modified electronic structures and improved electrochemical performance, leading to enhanced specific capacitance and cycling stability in NPC-supported MnO2 electrodes compared to MnO2 nanoparticles. Three symmetric supercapacitor devices connected in series can power a green LED bulb for over 55 minutes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Daixiu Wei, Liqiang Wang, Yongjie Zhang, Wu Gong, Tomohito Tsuru, Ivan Lobzenko, Jing Jiang, Stefanus Harjo, Takuro Kawasaki, Jae Wung Bae, Wenjun Lu, Zhen Lu, Yuichiro Hayasaka, Takanori Kiguchi, Norihiko L. Okamoto, Tetsu Ichitsubo, Hyoung Seop Kim, Tadashi Furuhara, Evan Ma, Hidemi Kato
Summary: Recently-developed high-entropy alloys (HEAs) have expanded the compositional space and mechanical properties by substituting the constituent metals with metalloids. Metalloid substitution increases strength by increasing local lattice distortion and short-range chemical inhomogeneities, while reducing stacking fault energy to discourage dynamic recovery.
Article
Materials Science, Multidisciplinary
Langting Zhang, Yajuan Duan, Eloi Pineda, Hidemi Kato, Jean-Marc Pelletier, Jichao Qiao
Summary: The influence of physical aging and cyclic loading on the power-law creep mechanism of a La30Ce30Ni10Al20Co10 high-entropy metallic glass was investigated. The results revealed significant discrepancies between thermal treatment and mechanical treatment in terms of the creep mechanism.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Daixiu Wei, Wu Gong, Takuro Kawasaki, Stefanus Harjo, Hidemi Kato
Summary: This study proposes a strategy to significantly enhance the strength of TWIP high-entropy alloys (HEAs) while maintaining satisfactory ductility by tuning the substructures. The strength of a representative TWIP HEA was improved through cryogenic pre-deformation-induced dislocations, martensite, nanotwins, and stacking faults. The influence of regulated microstructures on yield strength was clarified, and the tensile properties of the HEA were improved through subsequent annealing.
SCRIPTA MATERIALIA
(2022)
Article
Engineering, Mechanical
Daixiu Wei, Wu Gong, Tomohito Tsuru, Takuro Kawasaki, Stefanus Harjo, Biao Cai, Peter K. Liaw, Hidemi Kato
Summary: This study investigated the yielding and hardening behaviors of high-entropy alloys (HEAs) using in situ neutron diffraction, first-principles method, and electron microscopy. The research found that high shear modulus and grain refinement can improve the yield strength of HEAs, while a larger dislocation density and stacking faults contribute to higher flow stresses and better ductility. Furthermore, low stacking fault energy promotes mechanical twinning and martensitic transformation, further enhancing the strain-hardening rate of HEAs.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Chemistry, Physical
Y. Ohashi, T. Wada, H. Kato
Summary: The glass-forming ability of Zr-Cu-based metallic glass with high entropy was investigated by adding elements such as Ag, Hf, and Ni. The study found that the addition of elements created new competitive liquid crystalline phases and improved the glass-forming ability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Shinya Hosokawa, Jean-Francois Berar, Nathalie Boudet, Wolf-Christian Pilgrim, Laszlo Pusztai, Satoshi Hiroi, Shinji Kohara, Hidemi Kato, Henry E. Fischer, Anita Zeidler
Summary: By comparing the local structures of metallic glasses with different glass-forming abilities, characteristic features related to high GFA were discovered. The larger concentration inhomogeneity of Ni/Cu in PNCP, the increased fraction of pure icosahedral arrangements, and the presence of the largest intermediate-size Cu rings may contribute to the excellent GFA of PNCP.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Physics, Multidisciplinary
Y. J. Duan, L. T. Zhang, J. C. Qiao, Yun-Jiang Wang, Y. Yang, T. Wada, H. Kato, J. M. Pelletier, E. Pineda, D. Crespo
Summary: This study investigates the evolution of stress relaxation in high-entropy metallic glasses and reveals a direct relationship between the fraction of liquidlike zones and the aging process as well as the relaxation modes spectrum. It sheds light on the intrinsic correlation between the static and dynamic mechanical response in high-entropy and conventional metallic glasses.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Hyeonseok Kwon, Stefanus Harjo, Takuro Kawasaki, Wu Gong, Sang Guk Jeong, Eun Seong Kim, Praveen Sathiyamoorthi, Hidemi Kato, Hyoung Seop Kim
Summary: Metastability engineering is a strategy to enhance the strength and ductility of alloys by deliberately lowering phase stability and promoting deformation-induced martensitic transformation. This study focuses on the martensitic transformation in a Fe50Co25Ni10Al5Ti5Mo5 medium-entropy alloy (MEA) under tensile loading. The results show that strain-induced BCC martensite significantly contributes to the work hardening response and high flow stress of the MEA.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2022)
Article
Physics, Applied
Hao Wang, Tetsu Ichitsubo, Hidemi Kato
Summary: The dynamic relaxation behavior of Pd42.5Ni7.5Cu30P20 metallic glass was studied at various temperatures and angular frequencies. The results show the presence of three different relaxation modes, each associated with specific activation energies and motion characteristics. These modes were also observed in the quasi-static creep compliance measurements and accurately simulated using the dynamic moduli and fitting parameters.
EUROPEAN PHYSICAL JOURNAL-APPLIED PHYSICS
(2023)
Article
Physics, Condensed Matter
Wei Guo, Tomoaki Niiyama, Rui Yamada, Masato Wakeda, Junji Saida
Summary: A novel thermal rejuvenation treatment facility for Zr-based bulk metallic glass (BMG) was developed, which involves rapid heating and indirect liquid nitrogen quenching. The reintroduction of free volume into the thermally rejuvenated BMG leads to a more disordered state. The rejuvenation process improves ductility by aiding in the recovery of shear transformation zone (STZ) site and volume.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Akira Takeuchi, Takeshi Wada, Kenji Amiya, Hidemi Kato, Takeshi Nagase
Summary: This study designed four Mo-Ni-Rh-Ru and Fe-Mo-Ni-Rh-Ru high-entropy alloys, and confirmed their hexagonal close-packed crystal structures through X-ray diffraction and scanning electron microscopy. The Fe20Mo20Ni20Rh20Ru20 alloy exhibited significantly higher mixing entropy than configuration entropy after annealing at 1700K for 1 hour, indicating its ultrahigh-mixing-entropy character.
MATERIALS TRANSACTIONS
(2023)
Article
Instruments & Instrumentation
F. Hori, Y. Morikuni, H. Obayashi, A. Iwase, T. Matsui, Y. Kaneno, T. Wada, H. Kato, N. Ishikawa
Summary: The hypo-eutectic alloy of Zr45Cu45Al10 was irradiated with 16 MeV and 200 MeV Au ions at room temperature. The effects of irradiation on the structure and hardness of the alloy were investigated using X-ray diffraction (XRD), Extended X-ray absorption fine structure (EXAFS), micro-Vickers hardness, and positron annihilation measurements. Amorphization was confirmed after irradiation, but the change in hardness strongly depended on the irradiation energy. The behavior of hardness showed a decrease and increase trend with increasing fluence for 16 MeV irradiation, while no decreasing trend was observed for 200 MeV irradiation. The EXAFS measurement revealed different changing ratios of Cu-Cu and Cu-Zr bonds around each Cu atom between low energy and high energy Au ion irradiation.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Nanoscience & Nanotechnology
Kota Kurabayashi, Takeshi Wada, Hidemi Kato
Summary: This letter investigates the joining of immiscible pure iron and pure magnesium using solid metal deal-loying. The Fe-Mg bicontinuous composite was formed at the weld interface by diffusion bonding and SMD. The Ni composition in the interlayer greatly influenced the weld strength, with optimal results obtained at 30 < x < 50 at.%.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Takeshi Wada, Pierre-Antoine Geslin, Daixu Wei, Hidemi Kato
Summary: Liquid metal dealloying is a promising technique to produce bicontinuous porous metals with high specific surface areas. However, it has not been applied to produce nickel-containing porous metals because of the lack of a suitable metallic bath. In this study, the authors demonstrate that nickel-containing porous metals can be produced by partial liquid metal dealloying, and the amount of soluble component in the resulting microstructure can be tuned by carefully choosing the bath element.
COMMUNICATIONS MATERIALS
(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)