Article
Materials Science, Multidisciplinary
Hari Prasanth Perumal, Mahesh Jadhav, E. Meher Abhinav, Jaivardhan Sinha, Sheela Singh
Summary: This study investigates the effect of increasing concentration of antiferromagnetic element Cr in FeCoCrxNi2Al (x = 0.5, 1.5) high entropy alloy (HEA) on their magnetic properties. The structure and composition of different phases in the HEA significantly influence its magnetic properties, with the sample containing Cr concentration x = 1.5 showing twice the saturation magnetization compared to x = 0.5. Additionally, the magnetization versus temperature response exhibits multi-phase characteristics and distinct behavior in both low temperature and high temperature regimes. The obtained soft ferromagnetic behavior of these HEAs is crucial for the development of a new class of alloys for various applications.
MATERIALS SCIENCE AND TECHNOLOGY
(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
Yuefeng Hu, Kefu Gan, Yong Zhang, Dingshun Yan, Qiankun Yang, Shuya Zhu, Zhiming Li
Summary: In this study, dual-interstitial alloying of C and N was employed to enhance the strength-ductility synergy of the model FCC CoCrFeMnNi HEA. The addition of C and N resulted in the refinement of grains and the formation of nanoprecipitates. The dual-interstitial HEA exhibited high yield strength and large elongation, with the primary deformation mechanisms being dislocation slip and mechanical twinning.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Laura Elena Geambazu, Cosmin Mihai Cotrut, Florin Miculescu, Ioana Csaki
Summary: By processing high-purity metal powders using solid-state processing and electro spark deposition, a high-entropy alloy coating was created. Pull-Off testing confirmed good adhesion of the coating to the substrate, and corrosion resistance testing showed excellent performance.
Article
Chemistry, Physical
Katia R. Cardoso, Virginie Roche, Alberto M. Jorge Jr, Flavio J. Antiqueira, Guilherme Zepon, Yannick Champion
Summary: In this study, the MgAlTiFeNi high entropy alloy was processed by high-energy ball milling under different atmospheres. The alloy showed different structures and hydrogen storage behaviors depending on the milling atmosphere. The RM-MgAlTiFeNi alloy exhibited good hydrogen storage capacity, fast absorption rate, and lower desorption temperature, while the MA-MgAlTiFeNi samples had lower electrochemical storage capacity due to the instability in alkaline solution.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xin Hu, Xinli Liu, Dingshun Yan, Zhiming Li
Summary: A bulk fine-grained W35Ta35Mo10Nb10V10 high-density high-entropy alloy was successfully fabricated using mechanical alloying and spark plasma sintering. The alloying effect became more significant with increased ball milling time during MA, and a supersaturated BCC matrix with Ta2VO6 oxides was formed after SPS at various temperatures. The high strength and hardness of the alloy were attributed to various strengthening mechanisms, including solid solution strengthening, grain boundary strengthening, precipitation strengthening, and interstitial solid solution strengthening.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Crystallography
Francisco Antao, Ricardo Martins, Jose Brito Correia, Rui Coelho da Silva, Antonio Pereira Goncalves, Elena Tejado, Jose Ygnacio Pastor, Eduardo Alves, Marta Dias
Summary: High entropy alloys CrNbTaVWx (where x = 1 and 1.7) have been developed for thermal barriers in fusion nuclear reactors. These alloys were prepared by ball milling and consolidated using Upgrade Field Assisted Sintering Technology. The study evaluated the structural and mechanical properties of the alloys and found that the amount of tungsten greatly affects the mechanical properties, with the CrNbTaVW1.7 alloy exhibiting higher flexural stress and strain to fracture.
Article
Chemistry, Physical
Ciprian Alexandru Manea, Mirela Sohaciu, Radu Stefanoiu, Mircea Ionut Petrescu, Magdalena Valentina Lungu, Ioana Csaki
Summary: This paper investigates an innovative high corrosion resistance coating realized by electrospark deposition, using HfNbTaTiZr high-entropy alloy material. The fabrication process involves mechanical alloying and spark plasma sintering consolidation. Stainless steel specimens were used for electrochemical testing in a 3.5% NaCl saline solution to evaluate corrosion resistance.
Article
Chemistry, Physical
Helia Kalantari, Morteza Zandrahimi, Mandana Adeli, Hadi Ebrahimifar
Summary: In this study, AlCoCrFeNiTiZn high-entropy alloy was produced in powder and bulk forms using mechanical alloying and sintering processes. The results showed that the bulk alloy obtained during sintering had a high relative density and exhibited excellent magnetic properties.
Article
Chemistry, Physical
Yang Zhang, Yunlong Ai, Weihua Chen, Sheng Ouyang
Summary: A new type of lightweight high entropy alloy was prepared by mechanical alloying and spark plasma sintering. The effects of milling time and sintering temperature on the alloy's phase evolution, microstructure, and mechanical properties were investigated. The alloy sintered at 1050 degrees C showed the best comprehensive mechanical properties, surpassing most similar alloys in terms of density, hardness, strength, plasticity, and specific strength.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Minjie Huang, Jufu Jiang, Ying Wang, Yingze Liu, Ying Zhang
Summary: This study investigated the effects of milling parameters and process control agents on the synthesis of Al0.8Co0.5Cr1.5CuFeNi powders by mechanical alloying. The results showed that the grain size and lattice strain of the powders changed with the variation of milling parameters. Different process control agents introduced different levels of carbon and oxygen pollution. The addition of ethanol and stearic acid effectively inhibited cold-welding and refined the particles.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Physical
Alina Elena Bololoi, Laura Elena Geambazu, Iulian Vasile Antoniac, Robert Viorel Bololoi, Ciprian Alexandru Manea, Vasile Danut Cojocaru, Delia Patroi
Summary: High-entropy alloys (HEAs) have gained interest in biomedical applications due to their unique effects and combination of constituent properties. A biocompatible HEA, known as bio-HEA, is considered as an alternative to market-available materials due to its superior properties. The alloy exhibits high strength and plasticity, with the presence of face-centered cubic phases contributing to high ductility. Microstructural and compositional analyses confirmed alloying had occurred, resulting in refined metallic powder particles with homogenous elemental distribution. Technological characterization revealed particle dimension reduction in the high-entropy alloy-elaborated powder.
Article
Engineering, Chemical
Amritava Sarkar, A. Srinivasan, P. S. Robi
Summary: Refractory High Entropy Alloys (RHEAs) are a new class of alloys suited for high-temperature applications. TiNbMoTaW RHEA powder, obtained through mechanical alloying, exhibits a single-phase solid solution with a body-centered cubic structure and thermal stability at elevated temperatures, highlighting its potential in high-temperature engineering applications.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Yan Wang, Yuhua Chen, Jilin Xie, Jiaming Ni, Timing Zhang, Shanlin Wang, Limeng Yin
Summary: A novel RFE process was used to fabricate CrMnFeCoNi HEA particles reinforced AMCs. The study showed that HEA particles reacted violently with the Al matrix, leading to the formation of fine grains and numerous second phases. The AMCs exhibited enhanced tensile strength compared to RFEed Al, but lower uniform elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
I Estrada-Guel, C. A. Rodriguez-Gonzalez, J. Hernandez-Paz, O. Jimenez, A. Santos-Beltran, R. Martinez-Sanchez, M. Romero-Romero, C. D. Gomez-Esparza
Summary: The concept of High-Entropy Alloy (HEA) has expanded the research field of advanced metallic materials. In this study, the AlCoCrCuFeNi HEA was modified by replacing copper with titanium to form a tetragonal phase for hardening effects. Through structure and microstructure analysis, as well as nanoindentation testing, the correlation between composition, crystalline structure, and mechanical properties of the alloy was determined.
Article
Polymer Science
M. G. Pena-Juarez, L. O. Sanchez-Vargas, L. A. Flores-Gonzalez, A. Almendarez-Camarillo, E. J. Gutierrez-Castaneda, J. Navarrete-Damian, E. Perez, J. A. Gonzalez-Calderon
Summary: This study evaluated the mechanical, antibacterial, and non-cytotoxic performance of isotactic polypropylene nanocomposites filled with silanized TiO2-Ag nanoparticles. The research found that the nanocomposites prepared using the one-step method with dietary supplement quercetin had the highest antibacterial activity and showed improved mechanical properties. Additionally, the nanocomposites were non-toxic to cells, suggesting potential industrial and commercial applications.
Article
Materials Science, Multidisciplinary
Alfonso C. Cruz, Luis S. Hernandez, Emmanuel J. Gutierrez
Summary: This work focuses on developing cyanide-free copper-silver electroplated coatings and investigating their corrosion resistance in a 5% NaClO solution. Silver coatings were obtained using a cyanide-free bath based on sodium thiosulfate at various current densities and concentrations of EDTA. Adhesion measurements were conducted using a tape test. The corrosion behavior was evaluated using polarization resistance (Rp) on samples with the best adhesion. The best results were achieved with a 20 μm thick silver coating deposited on a copper coating previously polished with colloidal silica, attributed to the formation of AgCl.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Chemistry, Applied
Mariana Gisela Pena-Juarez, Luis Octavio Sanchez-Vargas, Emmanuel Jose Gutierrez-Castaneda, Rocio Saldana-Garces, Ricardo Lopez-Esparza, Jose Luis Cuellar-Camacho, Jaime Ruiz-Garcia, Jose Amir Gonzalez-Calderon
Summary: In this research, silver nanoparticles (AgNPs) were deposited on TiO2 using a natural flavonoid under neutral conditions to obtain antibacterial nanomaterials without cytotoxicity. The results showed that the deposition with dietary supplement is more efficient and safer, while the process carried out with reactive grade is inadequate. The nanomaterials synthesized with dietary supplements exhibited higher inhibition against bacteria and were non-toxic up to 100 ppm.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
E. Gutierrez, E. Salazar, A. Salinas, R. Deaquino, A. Ponce, M. Yacaman, D. Alducin, E. Ortega, A. Bedolla, B. Fernandez, R. Martinez, C. Garay
Summary: This paper investigates the influence of graphite and milling time on the texture, microstructure, and mechanical properties of AA7075-graphite composites produced through mechanical alloying and hot extrusion. Various characterization techniques were used, including electron microscopy, X-ray diffraction, and electron diffraction, and mechanical properties were evaluated through tensile tests. The results show that the particle and crystallite size of the milled powders affect the grain size of the extruded samples. The presence of deformation texture components in recrystallized samples is explained by the oriented nucleation mechanism. Hardness, yield strength, and ultimate tensile strength increase with graphite content and milling time, while elongation to fracture decreases. The size of recrystallized grains decreases with increasing milling time and graphite content. The investigated composites are enhanced by grain refinement, dispersion of certain compounds, and the development of a random texture.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
S. Gonzalez, A. K. Sfikas, S. Kamnis, C. G. Garay-Reyes, A. Hurtado-Macias, R. Martinez-Sanchez
Summary: This work presents a CoCrFeMnNi0.8V high entropy alloy (HEA) with a multiple length-scale hierarchical microstructure obtained through rapid cooling at around 62.5 K/s. The microstructure consists of a dominant globular sigma phase, FCC matrix, and V-rich particles, which has not been reported before for the CoCrFeMnNiV system. The new microstructure results in a significant improvement in both hardness and wear resistance, increasing fourfold and sixfold, respectively, compared to the CoCrFeMnNi alloy.
Article
Materials Science, Multidisciplinary
E. J. Gutierrez Castaneda, D. Ruiz Cigarrillo, A. Torres Castillo, A. Salinas Rodriguez, R. Deaquino Lara, A. Bedolla Jacuinde, C. A. Hernandez Bocanegra
Summary: This paper deals with the construction of an experimental intercritical continuous cooling transformation (CCT) diagram for the manufacture of low-alloyed low-carbon multiphase steels. The critical transformation temperatures and the evolution of austenite on continuous heating were determined through in-situ dilatometric study. The transformed austenite was quantitatively analyzed using the lever rule method, and the intercritical austenite decomposition for different cooling rates was further investigated. The time and temperatures required for phase transformations were determined from the first derivative of the dilation curves, and critical points were plotted to construct the corresponding CCT diagram.
Article
Materials Science, Multidisciplinary
Enrique Rocha-Rangel, Ivanovich Estrada-Guel, Jose A. Castillo-Robles, Jose A. Rodriguez-Garcia, Carlos G. Garay-Reyes, Alejandro Villalobos-Aragon, Cynthia D. Gomez-Esparza, Carlos Adrian Calles-Arriaga, Roberto Martinez-Sanchez
Article
Materials Science, Multidisciplinary
F. Hernandez Navarro, E. Gutierrez Castaneda, V. E. Salazar Munoz, A. Bedolla Jacuinde, R. Deaquino Lara, A. Salinas Rodriguez, P. Zambrano Robledo
Summary: Recent reports have shown that the magnetic behavior of electrical steels containing Si + Al can be improved by an alternative processing route of intercritical annealing before cold-rolling. However, the effects of this processing route on steels containing Si-Al-Sb have not been investigated. This study presents the microstructure and magnetic properties of Si-Al-Sb electrical steels processed by the alternative route and compares them with Si-Al electrical steel sheets processed by conventional and alternative routes. The results demonstrate that Si-Al-Sb steels processed by the alternative route exhibit better performance than Si + Al steels processed by either the conventional or the alternative route.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Luis Espinosa, Antonio Torres, Roel Cruz, Rogelio Deaquino, Armando Salinas, Amir Gonzalez, Ivan Reyes, Javier Aguilar, Salvador Palomares, Emmanuel Gutierrez
Summary: Recent works have found that the development of carbide-free bainitic (CFB) steels using current chemical compositions require long isothermal treatments, which poses challenges for their manufacture under industrial continuous annealing processes. This study presents a new approach for designing CFB steels based on computer simulations of phase transformations and investigates the influence of chemistry and isothermal bainitic treatment (IBT) time on the microstructure and mechanical properties of CFB steels. The findings show that third-generation CFB steels with approximately 96% bainite can be achieved through short IBT times, offering the possibility of manufacturing these steels under industrial conditions.
Article
Biochemistry & Molecular Biology
Veronica Martinez-Aguilar, Mariana G. Pena-Juarez, Perla C. Carrillo-Sanchez, Leticia Lopez-Zamora, Enrique Delgado-Alvarado, Emmanuel J. Gutierrez-Castaneda, Norma L. Flores-Martinez, Agustin L. Herrera-May, Jose Amir Gonzalez-Calderon
Summary: One of the main causes of food spoilage is lipid oxidation, which leads to loss of nutrients and color, as well as the growth of pathogenic microorganisms. Active packaging, using polylactic acid (PLA) and silicon dioxide (SiO2) nanoparticles modified with cinnamon essential oil (CEO), has been developed to minimize these effects. The modified nanoparticles showed strong inhibition against E. coli and high radical inhibition and cell viability. Films prepared with these nanoparticles exhibited improved tensile strength and Young's modulus, but decreased water solubility. Packaging prepared with the modified nanoparticles showed good results in terms of color difference, organic acid degradation, weight loss, and pH, making CEO-SiO2 a promising component for active packaging.
Article
Engineering, Mechanical
Gustavo Rodriguez-Cabriales, Carlos G. Garay-Reyes, Juan C. Guia-Tello, Hansel M. Medrano-Prieto, Ivanovich Estrada-Guel, Lilia J. Garcia-Hernandez, Marco A. Ruiz-Esparza-Rodriguez, Jose M. Mendoza-Duarte, Karen A. Garcia-Aguirre, Sergio Gonzales-Sanchez, Roberto Martinez-Sanchez
Summary: Different Al-4Cu-1.5Mg/WC composites were synthesized through powder metallurgy to investigate the effect of WC particle addition on the abrasive wear behavior of an Al-4Cu-1.5Mg alloy. The results showed that WC additions increase the hardness of the alloy, improving the wear resistance by preventing direct contact with the counterbody and delaying plastic deformation. The dominant wear mechanism was abrasive wear, and the increased friction coefficient did not result in a rapid wear rate due to the enhanced deformation resistance.
Article
Metallurgy & Metallurgical Engineering
J. D. Franco-Madrid, C. G. Garay-Reyes, I. Estrada-Guel, M. A. Ruiz-Esparza-Rodriguez, J. M. Mendoza-Duarte, P. A. Guerrero-Seanez, K. A. Garcia-Aguirre, R. Martinez-Sanchez
Summary: This study evaluates the relationship between solution heat treatment and hot plastic deformation before aging treatment and its effect on A356 alloys' mechanical properties and microstructural features. The study employed tensile tests, Vickers microhardness tests, and electron microscopy analysis. The results show that hot plastic deformation before the solution treatment leads to higher elongation, ultimate tensile stress, and yield strength values, which can be attributed to modifications in eutectic Si particles (spheroidisation, aspect ratio and roundness). On the other hand, hot plastic deformation after the solution treatment mainly affects the elongation of the alloy. This effect is due to the fracture of eutectic Si particles and the formation of cracks and voids between these particles, which facilitate crack nucleation. Thus, the combination of hot plastic deformation and subsequent solution treatment significantly improves the mechanical properties of the A356 alloy. The observed changes in microstructure and mechanical behaviour provide valuable insights for optimizing the material's properties and refining an established process in the automotive wheel industry.
CANADIAN METALLURGICAL QUARTERLY
(2023)
Article
Materials Science, Multidisciplinary
R. E. Villarreal-Loya, C. G. Garay-Reyes, J. M. Mendoza-Duarte, J. L. Hernandez-Rivera, J. J. Cruz-Rivera, I. Estrada-Guel, R. Martinez-Sanchez
Summary: This manuscript presents the development of a lead-free multicomponent solder alloy for heat-sensitive electronic devices. The alloy consists of Sn, Bi, In, Cu, and Zn, and has a microstructure with a homogeneous distribution of CuZn particles in a eutectic mixture of Sn and InBi. The developed system shows promising potential for ultra-low-temperature lead-free solders.
Article
Chemistry, Applied
Javier E. Vilaso-Cadre, Delia M. Avila-Marquez, Ivan A. Reyes-Dominguez, Alien Blanco-Flores, H. Paola Toledo-Jaldin, Emmanuel J. Gutierrez-Castaneda, Javier Aguilar-Carrillo de Albornoz
Summary: This study explores the flotation of sub-bituminous coal using 1-butylamine as a collector and compares it with other collectors. The results show that 1-butylamine achieves the best efficiency.
INDIAN JOURNAL OF CHEMICAL TECHNOLOGY
(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)
