Article
Materials Science, Multidisciplinary
Devashish Rajpoot, R. Lakshmi Narayan, Long Zhang, Punit Kumar, Haifeng Zhang, Parag Tandaiya, Upadrasta Ramamurty
Summary: Fracture behavior of bulk metallic glass matrix composites with both transforming and non-transforming fi-Ti dendrites under shear and opening modes was examined, showing lower fracture toughness in mode II due to shear dominant stress state and considerable crack growth in this mode. Despite the ability of transforming dendrites to strain harden and enhance ductility, BMGCs reinforced with non-transforming dendrites exhibit higher toughness in both modes. Shear band patterns suggest identical fracture mechanism in BMGCs and BMGs, with differences rationalized by the effect of relaxation enthalpy and dendrites length scale.
Article
Chemistry, Physical
Y. S. Luo, J. J. Li, Z. Wang, M. Zhang, J. W. Qiao
Summary: Based on a simple mean-field model, two distinct types of slip avalanches in serrated plastic flows of bulk metallic glasses were identified to differentiate the slipping modes of shear bands under various strain rates. Small avalanches propagate progressively, while large avalanches follow a simultaneous propagation. By defining a weakening parameter and critical size, researchers were able to characterize the completely disparate shearing modes, with larger weakening and lower critical sizes indicating more activated shear transformation zones, offering a new method to explore plasticity in bulk metallic glasses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Xiangkui Liu, Jian Kong, Xinxiang Song, Shuai Feng, Zibo Zhang, Yang Yang, Tianchi Wang
Summary: The total free volume, consisting of intrinsic and excess free volume, plays a crucial role in determining the plasticity of metallic glasses. Metallic glasses with Zr content ranging from 30 to 45 at% exhibit enhanced plasticity due to their larger content of total free volume.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Afrouz Hassanpour, Mayur Vaidya, Sergiy Divinski, Gerhard Wilde
Summary: The impact of different thermo-mechanical treatments on shear band diffusion in a model bulk metallic glass was investigated. It was found that HPT processing and cold rolling can enhance diffusion rates, while cryogenic thermo-cycling further increases shear band diffusion speed.
Article
Nanoscience & Nanotechnology
C. Liu, Y. Ikeda, R. Maass
Summary: This study provides strong evidence for the accumulation of structural damage in Zr-based bulk metallic glass as a result of shear strain admitted by shear bands. Analysis of shear-band structure with high-angle annular dark field transmission electron microscopy reveals scattered data with an overall trend of increasing local volume dilatation with increasing shear strain. However, locally, a variety of trends are observed, highlighting the strong heterogeneity of structural damage in shear bands in metallic glasses.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Wook Ha Ryu, Won-Seok Ko, Haruka Isano, Rui Yamada, Hehsang Ahn, Geun Hee Yoo, Kook Noh Yoon, Eun Soo Park, Junji Saida
Summary: In this study, we systematically investigate the compressive plasticity and shear band behavior of Zr-based bulk metallic glasses (BMGs) with different Poisson's ratio and aspect ratios/contact friction coupling. Our findings demonstrate that lower contact friction and smaller aspect ratios can promote shear band distribution and improve global plasticity. We propose three stages of plastic flow in BMGs and show that the variation of plastic flow is mainly affected by aspect ratio and Poisson's ratio. We also propose a three-dimensional map of plastic flow in Zr-based BMGs reflecting the key multi-variables for shear band behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Devashish Rajpoot, R. Lakshmi Narayan, Long Zhang, Punit Kumar, Haifeng Zhang, Parag Tandaiya, Upadrasta Ramamurty
Summary: This study investigates the embrittlement of a beta-Ti dendrite reinforced Zr-based bulk metallic glass composite (BMGC) when cast in a large size, and examines the effectiveness of cryothermal cycling (CTC) treatment in restoring the mode I fracture toughness. The plasticity of CTC treated BMGC is estimated through nanoindentation tests and differential scanning calorimetry (DSC), and validated through compression tests. The study reveals that both as-cast embrittled BMGC and CTC treated BMGC exhibit brittleness, with 5 times lower notch toughness compared to their tougher counterpart. The absence of notch-tip plasticity in the CTC treated BMGC, despite indications of plasticity in nanoindentation and higher enthalpy of relaxation (Delta H-rel), is explained through reassessing the origin of pop-ins in nanoindentation tests and variations in chemical and topological short range ordering during CTC. The implications of these results for improving the fracture toughness of structurally relaxed BMGCs using CTC are discussed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Karina E. Avila, Vardan Hoviki Vardanyan, Tong Zhu, Stefan Kuechemann, Marek Smaga, Herbert M. Urbassek
Summary: In this study, both experiments and molecular dynamics simulations were used to explore the deformation behavior of metallic glasses subjected to previous tensile deformation. The experimental investigations were carried out on a Zr67Cu10.6Ni9.8Ti8.8Be3.8 (wt%) sample, while the simulations were performed on a Cu64.5Zr35.5 sample. Plasticity was induced in the specimens through tensile deformation and further studied using cyclic indentation. The results from both experiments and simulations showed qualitative agreement in terms of the measured macroscopic properties and revealed the evolution of microscopic properties in different regions.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Zhi Qiang Ren, Yu Wei Liu, Ying Liu, Jing Tao Wang
Summary: In this paper, a theoretical formulation for shear transformation zone (STZ) volume, shear band density, and plasticity is presented. The temperature dependence of these parameters is discussed. The experimental data of plasticity for Vit105 bulk metallic glass show negative temperature dependence, which is consistent with the prediction of the analytical formulation.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
A. Sharma, S. S. Hirmukhe, Sree Harsha Nandam, Horst Hahn, I. Singh, R. Lakshmi Narayan, K. Eswar Prasad
Summary: The strain rate sensitivity of a binary Cu60Zr40 nanoglass and metallic glass was studied using nanoindentation. The metallic glass exhibited noticeable displacement bursts at low loading rates, while the nanoglass showed a near homogeneous plastic flow. Both materials displayed a decrease in hardness with increasing loading rate, indicating negative strain rate sensitivity. The nanoglass had a higher strain rate sensitivity than the metallic glass.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Shristy Jha, Saideep Muskeri, Siva Shankar Alla, Sundeep Mukherjee
Summary: Bulk Metallic Glasses (BMGs) have limited bulk plasticity due to shear localization. The effect of structural state and stress state on the micro-scale deformation behavior of BMGs is not well understood. In this study, a model Ni-based BMG was investigated under multiaxial nano-indentation, uniaxial micro-pillar compression, and micro-cantilever beam bending. The relaxed BMG showed increased hardness, yield strength, and bending strength compared to its as-cast counterpart. Both the as-cast and relaxed samples exhibited stable notch opening and blunting during micro-cantilever bending tests, but notch weakening was observed for both structural states. This research may stimulate further investigations into the deformation behavior of BMGs in real-world structural applications at small scale.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Yuping Zhang, Huanwu Cheng, Wei Du, Yonghua Shen
Summary: In this study, BMGCs with different compositions were prepared and the shear band extensions under strain were observed. It was found that the addition of Ag element significantly improved the glass forming ability. The size, volume fraction, and morphology of in-situ crystal phase played an important role in the initiation and extension of shear bands, and crystal phases with appropriate size, volume fraction, and morphology were beneficial for improving the plasticity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Tianbing He, Tiwen Lu, Daniel Sopu, Xiaoliang Han, Haizhou Lu, Kornelius Nielsch, Jurgen Eckert, Nevaf Ciftci, Volker Uhlenwinkel, Konrad Kosiba, Sergio Scudino
Summary: This study explores the effectiveness of powder metallurgy as an alternative method for synthesizing shape memory bulk metallic glass composites. Shape memory bulk metallic glass composites with tunable microstructures and properties are obtained by hot pressing. The results demonstrate the expanded range of shape memory bulk metallic glass composites by freely choosing the combination of glassy matrix and shape memory phase.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
H. H. Tang, X. B. Li, J. S. Zhang, D. Zhou, Z. W. Wu, S. H. Chen
Summary: Fractal analyses were conducted to unravel the relationship between serrated flows and complex shear bands in evolving bulk metallic glasses (BMGs). The increase of strains led to continuous increases in fractal dimensions of both shear-band patterns and serrated flows. Positive correlation between load-drop distributions and shear-band patterns was observed from the perspective of chaos degree. Hurst exponents less than 0.5 indicated a strong negative correlation behavior and a negative feedback mechanism in shear band development. Fractal dimensions and Weibull moduli at different strain stages indicated that load drops initially demonstrated relatively high uniformity and then stabilized at a low uniformity, which was related to regular shear-band patterns with fractal structure. These findings provide further understanding of the formation of shear bands and serrated flows in BMGs and offer a new method to uncover the plastic deformation mechanisms of BMGs using fractal analysis.
Article
Materials Science, Multidisciplinary
Yuanli Xu, Jiahe Song, Wenli Ma, Xinli Kou
Summary: The study investigated the serrated flow behavior of Zr61.7Al8Ni13Cu17Sn0.3 bulk metallic glass with different aspect ratios, finding that the behavior changes from uniform to nonuniform as the aspect ratio increases. Moreover, the normalized stress drop magnitude increases with increasing aspect ratios.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Ceramics
Bo Shi, Shiqi Yang, Shuhong Liu, Peipeng Jin
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2019)
Article
Materials Science, Ceramics
Hongbing Yang, Lu Li, Wenbin Cao, Yuhang Liu, Masood Mukhtar, Libin Zhao, Yueming Kang, Yanhao Dong, Jiangong Li
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Editorial Material
Multidisciplinary Sciences
Jiangong Li, Sanxu Pu, Wenbin Cao, Lu Li, Ruiyun Guo
Article
Chemistry, Multidisciplinary
Yanhao Dong, Hongbing Yang, Lin Zhang, Xingyu Li, Dong Ding, Xiaohui Wang, Ju Li, Jiangong Li, I-Wei Chen
Summary: A two-step sintering route has been successfully used to achieve uniform grain-size distribution in nanocrystalline materials, surpassing theoretical predictions. This breakthrough provides valuable insights for advancements in materials science.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Songbo Chen, Yu Ma, Yongcheng Xiao, Xinjun Hu, Dong He, Huqiang Chen, Rui Xia, Yin Wu, Jiangong Li, Yongxiao Bai
APPLIED SURFACE SCIENCE
(2020)
Article
Chemistry, Physical
Desheng Yang, Guoqiang Yang, Guosheng Liang, Qian Guo, Yuanyuan Li, Jiangong Li
Summary: Nanoglass microstructure is considered a potential strategic approach for enhancing the toughness of brittle glasses. Ultrafine amorphous SiO2 nanoparticles with high dispersion were successfully synthesized using sol-gel method and calcination, achieving the highest surface area so far. The use of specific catalysts and solvents played a key role in refining the SiO2 nanoparticles and eliminating aggregation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Nanoscience & Nanotechnology
Ruiyun Li, Xing Yang, Yongfu Wang, Junyan Zhang, Jiangong Li
Summary: This study presents a new approach to achieve superlubricity for DLC films by introducing metal nanoparticles on the films, which does not rely on the film preparation parameters. The metal nanoparticles control the structures of wear products and enable the formation of graphene-coated particles at the interface, leading to metal-carbon interfacial superlubricity with significant changes at the frictional interface.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Hongbing Yang, Lu Li, Yuanyuan Li, Bing Shen, Yueming Kang, Libin Zhao, Jiajie Li, Yanhao Dong, Jiangong Li
Summary: This study addresses the challenge of scalable pressureless sintering of nanocrystalline alumina ceramics using ultrafine alpha-Al2O3 nanopowders and a two-step sintering technique. The results show that the exceptional sinterability of these nanopowders can be attributed to their small size, large surface area, and good dispersity, rather than a new sintering mechanism. The importance of fast firing and non-equilibrium nature for low-temperature sintering of such nanopowders is highlighted.
JOURNAL OF MATERIOMICS
(2021)
Article
Nanoscience & Nanotechnology
Sailong Zhang, Bo Shi, Jinhui Wang, Yuanli Xu, Peipeng Jin
Summary: Rejuvenation of a naturally aged Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass (BMG) can be achieved by laterally elastostatic pre-loading. The serration flow of the rejuvenated BMG shows a bimodal fashion, with smaller and larger serrations appearing alternately, indicating a more heterogeneous structure induced by elastostatic effects. Both coarse and fine shear bands, with strong interactions among themselves, coexist in the rejuvenated BMG.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Ruiyun Li, Xing Yang, Jun Zhao, Chengtao Yue, Yongfu Wang, Jiangong Li, Ernst Meyer, Junyan Zhang, Yijun Shi
Summary: This study reports a facile way to achieve robust macroscale superlubricity in a vacuum environment by forming graphene/transition-metal dichalcogenide (TMDC) heterostructures on wear-induced rough surfaces. The sandwich structures readily transform into graphene/TMDC heterostructures during running-in stage, and assemble into multipoint flake-like tribofilms to achieve macroscale superlubricity.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Environmental
Ruiyun Li, Chaojie Sun, Xing Yang, Yongfu Wang, Kaixiong Gao, Junyan Zhang, Jiangong Li
Summary: The study introduces a novel method to achieve high load-bearing and ambient robust superlubricity by utilizing the deformation of FL-C:H substrate to disperse high contact pressure and maintain structural integrity of 2D materials. By preparing graphene with few defects using BSEG technique, environmental chemical interaction is weakened, leading to superlubricity under both vacuum and ambient conditions at high load. This approach bridges the gap between structural superlubricity and practical applications, potentially reducing energy dissipation significantly.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Sailong Zhang, Bo Shi, Jinhui Wang, Peipeng Jin
Summary: In this study, a nonuniform structure was created in a Zr-based metallic glass using lateral elastostatic preloading, which effectively suppressed shear band propagation and improved the relationship between strength and plasticity. Additionally, a stress-induced memory effect was observed during elastostatic loading. These findings have important implications for the rejuvenation and mechanical property improvement of metallic glasses.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Ceramics
Lu Li, Hongbing Yang, Libin Zhao, Yuanyuan Li, Bing Shen, Masood Mukhtar, Jiangong Li
Summary: In this study, high-purity, disperse, ultrafine, and equiaxed γ-Al2O3 nanoparticles were successfully synthesized through ball milling and acid corrosion methods. The size distribution of the particles was narrow after fractionated coagulation separations. The preparation process is simple, scalable, and holds great potential for various applications.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2022)
Article
Chemistry, Physical
Guangkuo Hu, Lin Ge, Yuanyuan Li, Masood Mukhtar, Bing Shen, Desheng Yang, Jiangong Li
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)
Review
Materials Science, Multidisciplinary
Bo Shi, Yuanli Xu, Peipeng Jin
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)
