Article
Nanoscience & Nanotechnology
Niraj Chawake, Lavanya Raman, Parthiban Ramasamy, Pradipta Ghosh, Florian Spieckermann, Christoph Gammer, B. S. Murty, Ravi Sankar Kottada, Juergen Eckert
Summary: This study synthesized a composite of two different medium entropy alloys using ball milling and spark plasma sintering, showing excellent microstructural and phase stability as well as multiple desirable mechanical properties. The results can serve as a template for other systems and demonstrate the feasibility of combining different medium entropy alloys.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Armita Shahbazkhan, Hamed Sabet, Mehrdad Abbasi
Summary: In this study, the microstructural and mechanical properties of NiCoCrAlSi high entropy alloy fabricated by mechanical alloying and spark plasma sintering (SPS) method were investigated. It was found that increasing milling time led to smaller crystallite size, higher lattice strain, and the formation of FCC1 and FCC2 phases in the final sample. The alloy showed a tensile strength of 1365 +/- 141 MPa after the SPS process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Chemical
Yake Xiao, Xianghe Peng, Tao Fu
Summary: This paper presents a novel high-entropy alloy with a heterogeneous microstructure containing multi-scale precipitates. The alloy exhibits excellent mechanical properties, surpassing those of most similar alloys prepared by powder metallurgy. It shows great promise for engineering applications.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ekaterina Yaprintseva, Alexei Vasil'ev, Maxim Yaprintsev, Oleg Ivanov
Summary: Reactive spark plasma sintering was for the first time applied to prepare medium-entropy grained PbSbTeSe alloy, showing promising thermoelectric performance with a low lattice thermal conductivity and anomalies in thermoelectric properties at specific temperatures.
Article
Materials Science, Ceramics
Mingcheng Zhu, Lan Zhang, Na Li, Desen Cheng, Jidong Zhang, Shiyao Yu, Hui Bai, Huizhong Ma
Summary: In this study, ternary ZrB2-SiC-MoSi2 composites with different compositions were successfully fabricated by reactive spark plasma sintering. The densification behavior, microstructures, and mechanical properties were investigated. It was found that the addition of MoSi2 could improve the relative density, hardness, and fracture toughness of the composites, and a core-shell structure could be formed to enhance the overall performance.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Jun Zhou, Hengcheng Liao, Hao Chen, Aijing Huang
Summary: A non-equiatomic high entropy alloy was successfully synthesized by mechanical alloying plus spark plasma sintering, showing higher compression yield strength and smaller grain size than alloys prepared by arc-melting method. This is mainly attributed to the combined effects of dislocation hardening, fine grain strengthening and precipitation hardening of second phase particles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Wenjie Pan, Peixin Fu, Zhanjiang Li, Hongxiang Chen, Qunhua Tang, Pinqiang Dai, Chao Liu, Le Lin
Summary: In this study, bulk eutectic high-entropy alloys with a phase constitution of FCC and BCC phases were successfully prepared by spark plasma sintering. The microstructure evolution from lamellar eutectic to massive eutectic was observed with the increase of sintering temperature. The alloy sintered at 1000°C showed the best mechanical performance and hardness, with the best wear resistance.
Article
Materials Science, Multidisciplinary
S. Pourmohammadi, A. Mohammadnejad, A. Bahrami, S. H. Mousavi Anijdan, N. Park, M. Ghosh
Summary: This study investigates the microstructure and mechanical properties of mechanically alloyed and spark plasma sintered AlCoFeMnNi-xB (x = 0, 0.5, 1, and 5 at. %) high-entropy alloys (HEAs). Boron-doped HEAs were synthesized using mechanical alloying and consolidated using spark plasma sintering. The microstructural evolution and phase differentiation were analyzed using scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. The mechanical properties were evaluated using shear-punch test, and the fracture surface was studied using SEM. The correlation between microstructure and mechanical characteristics of the boron-containing high-entropy alloys is discussed.
Article
Chemistry, Physical
Nikolay Razumov, Tagir Makhmutov, Artem Kim, Boris Shemyakinsky, Aleksey Shakhmatov, Vera Popovich, Anatoly Popovich
Summary: In this study, bulk samples of a CrMoNbWV high-entropy alloy were successfully obtained for the first time using spark plasma sintering. The alloy exhibited excellent wear and corrosion resistance, high hardness, and compressive strength, showing promising mechanical properties for potential applications in various fields.
Article
Chemistry, Physical
Oleg Ivanov, Maxim Yaprintsev, Alexei Vasil'ev, Ekaterina Yaprintseva
Summary: The medium-entropy BiSbTe1.5Se1.5 alloy was prepared using self-propagating high-temperature synthesis and spark plasma sintering, resulting in a lamellar grain structure with partially ordered grains. The block-textured structure exhibited different orientations of lamellar sheets in neighboring blocks due to specific features of the starting powder, leading to different thermoelectric properties measured perpendicularly or parallel to a texturing axis. The highest thermoelectric figure-of-merit was observed for the perpendicular measuring orientation, indicating promising potential for developing high-entropy alloys with enhanced thermoelectric efficiency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Metallurgy & Metallurgical Engineering
Lin Zhangqian, Zheng Wei, Li Hao, Wang Dongjun
Summary: The study investigated the effects of sintering parameters on the microstructure and mechanical properties of TA15 titanium alloy fabricated via spark plasma sintering, showing that sintering temperature and time have a significant impact on microstructure while sintering pressure has minimal effect. Densification of TA15 titanium alloy can be achieved effectively with appropriate sintering conditions, and graphene-reinforced TA15 composites exhibit significantly improved mechanical properties compared to the titanium alloy.
ACTA METALLURGICA SINICA
(2021)
Article
Materials Science, Multidisciplinary
Mohammad Reza Toroghinejad, Hossein Pirmoradian, Ali Shabani
Summary: FeCrCoNiCu high entropy alloy was produced through mechanical alloying and spark plasma sintering processes. The alloy exhibited good mechanical properties, including low porosity and high ultimate strength.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Kai Zhai, Shaohui Chen, Chengduo Wang, Qingkui Li, Benshuang Sun, Jilin He
Summary: A novel low-cost WC-CoCuFeNi cemented carbide has been produced using spark plasma sintering technology. The newly-developed cemented carbides exhibit a good combination of hardness and fracture toughness, making them a promising substitute for WC-Co.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Ceramics
Lanqing Liang, Boxin Wei, Dong Wang, Wenbin Fang, Lei Chen, Yujin Wang
Summary: Dense (Zr, Ti) (C, N) ceramics with improved mechanical properties were fabricated by spark plasma sintering using ZrC, TiCN, and ZrH2 powders.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Tao Xiang, Zeyun Cai, Peng Du, Kun Li, Zongwei Zhang, Guoqiang Xie
Summary: The NbTaTiZr high-entropy alloys prepared by mechanical alloying (MA) and spark plasma sintering (SPS) exhibit excellent mechanical properties with a dual-phase BCC structure and nano-scale grain size. The compressive fracture strength reaches the highest at 2511+/-78 MPa at a sintering temperature of 800 degrees C, while the highest fracture strain is achieved at 12.8% at 1000 degrees C.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Xixi Dong, Lingyun Feng, Shihao Wang, Gang Ji, Ahmed Addad, Hailin Yang, Eric A. Nyberg, Shouxun Ji
Summary: This study achieved excellent creep resistance in a magnesium alloy under high temperature and stress conditions, mainly due to the formation of AlMnGd SRO/clusters and their pinning effect on dislocations.
Article
Materials Science, Multidisciplinary
Lingyun Feng, Xixi Dong, Qing Cai, Bin Wang, Shouxun Ji
Summary: The microstructures and tensile properties of high-pressure die-cast Mg1.6La1.0Ce alloy with different Nd contents were investigated. The addition of Nd changed the eutectic morphology and improved the strength of the alloy.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Industrial
Zhichao Niu, Guangyu Liu, Tian Li, Shouxun Ji
Summary: This study optimized the process parameters in high pressure die casting through numerical simulation and experimental verification, and evaluated the castability and mechanical properties of the castings. The results showed that the process parameters significantly influenced the casting performance, and a new concept for evaluating the castability of extra-large thin-wall castings was proposed.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Jianying Wang, Jianpeng Zou, Hailin Yang, Zhilin Liu, Shouxun Ji
Summary: This study investigates the effect of minor Mo doping on the microstructure and mechanical properties of a (CoCrNi)(95)Mo-5 medium-entropy alloy. The results demonstrate that selective laser melting can achieve high strength and ductility in the alloy by creating a hierarchical microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Fei Lei, Tao Wen, Feipeng Yang, Jianying Wang, Junwei Fu, Hailin Yang, Jiong Wang, Jianming Ruan, Shouxun Ji
Summary: Selective laser melting (SLM) can improve the mechanical properties of H13 steel by optimizing the process parameters and establishing the correlation between microstructure and mechanical properties. Through examination of microstructures, it was found that the SLMed H13 exhibited cellular structures and columnar grains, with lath martensite and retained austenite containing nanoscale carbides. The as-SLMed H13 showed excellent strength-ductility synergy due to the fine grains, unique cellular structures, and presence of dislocations.
Article
Materials Science, Multidisciplinary
Xixi Dong, Lingyun Feng, Shihao Wang, Feng Wang, Rohollah Ghasemi, Gang Ji, Eric A. Nyberg, Shouxun Ji
Summary: A quantitative strategy was used to design and develop a Mg-Al-based alloy with high thermal conductivity by introducing specific RE elements to reduce Al concentration in Mg matrix and suppress the formation of detrimental phases. The novel die-cast Mg3.2Al4.4La0.4Nd alloy exhibited superior thermal conductivity, yield strength, and ductility compared to the commercial AE44 alloy, demonstrating the effectiveness of the quantitative approach in alloy development.
Article
Materials Science, Multidisciplinary
Jianying Wang, Jianpeng Zou, Hailin Yang, Xixi Dong, Peng Cao, Xiaozhou Liao, Zhilin Liu, Shouxun Ji
Summary: Superior mechanical properties have been achieved in a coarse-grained single-phase face-centered cubic (fcc) medium-entropy alloy (MEA) by carefully designing multi-scale heterogeneous structures. The alloy exhibits high ultimate tensile strength and fracture strain, mainly attributed to the favorable heterogeneous fcc matrix, coherent spherical precipitates, and a high density of crystalline defects.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Jianying Wang, Jianpeng Zou, Hailin Yang, Hua Huang, Zhilin Liu, Shouxun Ji
Summary: Through architecting lattice defects in refined grains, superior mechanical performance of CoCrNi mediumentropy alloy can be achieved without adding alloying elements and/or extra particles.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Anjing Wang, Jianying Wang, Feipeng Yang, Tao Wen, Hailin Yang, Shouxun Ji
Summary: A method of fabricating CoCrNi/TiN composite through spark plasma sintering (SPS) and rolling and annealing is presented to achieve a superior combination of strength and ductility. The superior synergy can be attributed to the refined structure, the formation of lattice defects, the interaction of nanotwin-TiN particles, and the concurrent process of potential grain boundary sliding.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Tao Wen, Feipeng Yang, Jianying Wang, Hailin Yang, Junwei Fu, Shouxun Ji
Summary: The microstructural evolution and mechanical properties of H13 steel fabricated by selective laser melting (SLM) with subsequent tempering treatment were systematically examined. The as-SLMed H13 samples exhibited a microstructure consisting of cellular structures, lath martensite, and a high volume fraction of retained austenite. After tempering at 600 degrees C for 1 h, nanoscale Cr23C6 particles were detected at the boundaries of the partially dissolved cellular structures. The improved mechanical properties of the H13 steel were attributed to the fine grains, retained cellular structures, and formation of Cr23C6 carbides.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Qian Hua, Ruidi Li, Minbo Wang, Hongbin Zhu, Xinyan Liu, Duan Lai, Jinfeng Li, Tiechui Yuan
Summary: Laser powder bed fusion (LPBF) of high-strength Al-Mg-Sc-Zr alloy has potential application in aerospace industry. The study investigates the high cycle fatigue property of LPBF-fabricated Al-Mg-Sc-Zr alloy and its correlation with defects, microstructure, and precipitated phases. Aging treatment results in the precipitation of nanosized Al3Sc intragranular particles and Mn-rich intergranular particles, which inhibit dislocation movement and improve fatigue strength. The ultimate tensile strength after aging treatment is 507.05 MPa, with a corresponding 10^7 cycle fatigue strength (R = -1) of 106 MPa. Fatigue crack initiation occurs at surface defects, especially lack of fusion, and propagates through the remaining part.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
Xiao Kang, Jianying Wang, Feipeng Yang, Xin Zhang, Youwang Tu, Lei Zhang, Hailin Yang
Summary: The purpose of this work is to synthesize CoCrNi/W/Agx composites with high wear resistance under ambient air and vacuum conditions. The friction and wear properties of these composites and CoCrNi medium entropy alloy were evaluated, and the chemical components and microstructural evolution of the tribo-films were analyzed using X-ray photoelectron spectroscopy and scanning electron microscopy. The self-lubricating mechanism of the CoCrNi/W/Agx composites under ambient air and vacuum conditions was also investigated. Increasing the Ag content increased the thickness of the tribo-films, improving the friction and wear properties of the alloys. The CoCrNi/W/Ag1.0 composite exhibited a significant improvement in tribological performance, with a high wear resistance of 2.79 x 10-5 mm3/N center dot m under vacuum condition and a volumetric wear rate as low as 1.35 x 10-5 mm3/N center dot m under ambient air condition.
Article
Engineering, Manufacturing
Pengda Niu, Ruidi Li, Zhiqi Fan, Peng Cao, Dan Zheng, Minbo Wang, Cao Deng, Tiechui Yuan
Summary: Hot cracking is a problem in laser powder bed fused AlxCoCrFeNi high entropy alloys. The researchers propose a strategy to transform the BCC phase to FCC phase to inhibit cracking. They found that Al0.5CoCrFeNi alloy with a single FCC crystal structure has low cracking sensitivity and good intergranular plastic compatibility. Precipitation heat treatment can further enhance the mechanical properties of the LPBF printed Al0.5CoCrFeNi alloy.
ADDITIVE MANUFACTURING
(2023)
Article
Metallurgy & Metallurgical Engineering
Zhi-hui Zhou, Mei Zhang, Tie-chui Yuan, Yun-bao Xu, Rui-di Li
Summary: Understanding and controlling the influence of impurity elements on the quality of boron carbide is of great importance. In this study, it was found through hot pressing sintering experiments that impurity elements can result in the formation of aggregation pores and abnormal grain growth, significantly reducing the toughness of boron carbide samples.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Engineering, Manufacturing
Jingtao Kang, Ruidi Li, Dan Zheng, Huiting Wu, Minbo Wang, Pengda Niu, Jian Li, Xinyan Liu, Duan Lai, Tiechui Yuan
Summary: In this study, we investigate the precipitation and martensitic transformation behavior of Ni-rich NiTi alloys fabricated via laser-directed energy deposition (LDED). The unique behavior observed in these alloys is attributed to the metastable microstructures and high residual stresses induced by the LDED technique. The precipitation of Ni4Ti3 particles is found to be uniform under all ageing conditions, and no traditional multiple-step martensitic transformations are observed.
VIRTUAL AND PHYSICAL PROTOTYPING
(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)
