Article
Materials Science, Multidisciplinary
Fang-Fang Xu, Yong Zhao, Yue Xu
Summary: Non-toxic and non-polluting rare earth and silane (RE-Si) composite conversion coatings were applied to the surface of magnesium-lithium alloy to improve its poor corrosion resistance. The parameters for coating preparation were determined, and the influence of doping nanoparticles on the composite coating was discussed. The corrosion resistance of specimens with RE-Si composite conversion coating was greatly improved compared to those without coating.
Article
Materials Science, Multidisciplinary
Tianyi Zhang, Lianjun Hao, Zaihao Jiang, Chao Liu, Libin Zhu, Xuequn Cheng, Zhiyong Liu, Ning Wang, Xiaogang Li
Summary: Rare earth (RE) decreases the initial corrosion susceptibility of Zr-Ti deoxidized low alloy steel in a simulated marine environment. This is achieved by modifying the properties of inclusion and pearlite. The dissolution of (RE)2O2S and (RE)xSy inclusions causes localized acidification, suppressing the hydrolysis of Ca2+ and inhibiting the deposition of CaCO3. This improves the compactness of the rust layer initially.
Article
Metallurgy & Metallurgical Engineering
Michal Knapek, Maria Zemkova, Adam Gres, Eva Jablonska, Frantisek Lukac, Robert Kral, Jan Bohlen, Peter Minarik
Summary: Alloying magnesium with rare-earth elements has been shown to improve material performance, and the novel WN43 alloy prepared by SPS demonstrates superior mechanical and corrosion properties, making it a promising candidate for biomedical applications with customizable characteristics.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Engineering, Chemical
Chunyan Tang, Xingwang Zhao, Jinglei Lei, Lingjie Li
Summary: The study prepared a film in lanthanum-nitrate and stearic-acid solutions that can provide durable protection for magnesium alloys, showing superior superhydrophobicity and corrosion resistance. Various durability tests confirmed the effective protection of the film for magnesium alloys.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Materials Science, Multidisciplinary
Zhipeng Wang, Zhao Shen, Yahuan Zhao, Yang Liu, Bo Hu, Xiaoqing Shang, Jingya Wang, Yangxin Li, Dejiang Li, Jianqiang Zhang, Sergio Lozano-Perez, Frank Czerwinski, Xiaoqin Zeng
Summary: The addition of rare-earth elements can enhance the oxidation resistance of Mg alloys by promoting the formation of continuous oxide scales. Among the added elements, Y has a faster diffusion rate and can facilitate external oxidation. However, the dissolution of Mg12Nd precipitates can accelerate the oxidation process. Therefore, in the design of oxidation-resistant Mg alloys, it is preferred to add RE elements with faster diffusion rates and control the number of thermal unstable precipitates.
MATERIALS TODAY ADVANCES
(2023)
Article
Metallurgy & Metallurgical Engineering
Hiba Azzeddine, Abdelkader Hanna, Achour Dakhouche, Berengere Luthringer-Feyerabend
Summary: The corrosion behavior of as-cast binary Mg-0.3Ce, Mg-1.44Nd, Mg-0.63Gd and Mg-0.41Dy alloys was investigated in DMEM+ 10% FBS solution using electrochemical and weight loss tests. Alloys with heavy RE elements (Gd and Dy) exhibited the lowest corrosion rate compared to those with light RE elements (Ce and Nd). The cytocompatibility of the Mg-RE alloys was assessed, with Mg-0.63Gd alloy identified as a suitable candidate for biomedical applications.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Materials Science, Multidisciplinary
Zhi Zhang, Jinshu Xie, Jinghuai Zhang, Hao Dong, Shujuan Liu, Xiaobo Zhang, Jun Wang, Ruizhi Wu
Summary: In this study, trace Er addition was found to synergistically improve the mechanical and anti-corrosion properties of the Mg-1.4Al-0.4Mn-0.4Ca0.3Er alloy. The corrosion rate of the alloy was reduced by one order of magnitude compared to the reference alloy. This improvement was attributed to the reduction in dynamic recrystallization and the formation of stronger strengthening phase particles. The addition of Er also promoted the formation of a less noble Al8Mn4Er phase with effective Fe trapping ability and induced dislocation segregation, leading to reduced micro-galvanic corrosion.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Gualter Silva Pereira, Guilherme Yuuki Koga, Julian Arnaldo Avila, Icaro Marino Bittencourt, Fernando Fernandez, Marcos Hideki Miyazaki, Walter Jose Botta, Waldek Wladimir Bose Filho
Summary: The study showed that the WE43 Mg alloy exhibited better corrosion resistance in a sodium chloride solution compared to commercially pure Mg, with a corrosion rate 10 to 100 times lower. This was mainly attributed to the nature of the corrosion product layer and its impact on the cathodic reaction of hydrogen gas evolution.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Jiajia Wang, Kaixiao Zhang, Guobing Ying, Jiangbo Cheng, Dan Song, Jinghua Jiang, Aibin Ma
Summary: Alloying rare earth (RE) elements is a promising method for enhancing corrosion resistance of Mg-Al alloy. However, high concentrations of RE can exacerbate galvanic corrosion. Density functional theory calculations were conducted to investigate the effects of RE (RE 1/4 Sc, Y, Nd) concentration on galvanic corrosion in Mg-Al alloy. The results demonstrated that low concentrations of RE can alleviate galvanic corrosion, while high concentrations can significantly aggravate it. Additionally, it was found that the effectiveness of mitigating galvanic corrosion followed the order of Sc > Y > Nd. Possible explanations for the experimental observations were provided, and a potential strategy to improve corrosion resistance of Mg-Al alloy was proposed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yu-Jun Feng, Qian Li, Tian-Liang Zhao, Fu-Sheng Pan
Summary: As-solutionized Mg-Sm-Zn-Zr alloy, benefiting from a quasi-passivated film, exhibits extraordinary corrosion resistance. The film consists of an outer layer, an intermediate layer, and a Zn-rich layer, and the oxide of solute element Sm strengthens the intermediate layer to impede corrosion.
Article
Materials Science, Multidisciplinary
Yanan Cui, Zhice Yang, Tao Zhang, Fuhui Wang
Summary: The inhibition mechanism of four inhibitors with different charge on Mg-Gd-Y alloy was investigated experimentally and theoretically. The different charge of inhibitor evoked the preferential adsorption behavior, changing the susceptibility of Mg-Gd-Y alloy to micro-galvanic corrosion. Moreover, the adsorption of inhibitor changed the surface energy of embryos of corrosion product, and strongly suppressed the nucleation rate of corrosion product, leading to poor protective performance. Thus, the inhibitor with anion, exhibiting satisfactory inhibition efficiency for AZ/AM series alloys, showed worse inhibition for the Mg-Gd-Y alloy. Finally, the strategy to select and/or synthesize inhibitors for Mg-RE alloys was presented.
Article
Engineering, Biomedical
Dong Bian, Xiao Chu, Jin Xiao, Zhipei Tong, He Huang, Qinggong Jia, Jianing Liu, Wenting Li, Hui Yu, Yue He, Limin Ma, Xiaolan Wang, Mei Li, Tao Yang, Wenhan Huang, Chi Zhang, Mengyu Yao, Yu Zhang, Zhigang Xu, Shaokang Guan, Yufeng Zheng
Summary: This study focuses on the simplicity and performance of single-phased Mg-RE alloys for biomedical purposes. The use of high-solubility rare earth elements allows for the achievement of a homogeneous single-phased microstructure, resulting in good corrosion resistance and mechanical properties. Compared to clinically-proven Mg-based implants, these alloys exhibit similar in-vitro and in-vivo performances, with gradual excretion of metal elements and less burden on main organs.
BIOACTIVE MATERIALS
(2023)
Article
Electrochemistry
Xiaoyu Fu, Ruiling Jia, Feng Guo, Wen Ma, Huixia Zhang, Jian Hou
Summary: The study revealed the corrosion mechanism of extruded AZ91 alloy with 1.0% (La, Ce) mischmetal addition by investigating the microstructural changes and corrosion behavior. The decrease in the size of intermetallic phases after extrusion influenced the corrosion morphology, with transverse section exhibiting mainly pitting corrosion and longitudinal section showing corrosion along grain boundaries.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2021)
Article
Engineering, Biomedical
Kerstin van Gaalen, Conall Quinn, Felix Benn, Peter E. McHugh, Alexander Kopp, Ted J. Vaughan
Summary: This study presents a computational framework that investigates the effect of localised surface-based corrosion on the mechanical performance of a magnesium-based alloy. Using a verified corrosion modelling approach, a quantitative relationship between mechanical integrity and corrosion features was established, with the minimal cross-sectional area parameter being the strongest predictor.
BIOACTIVE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Pingli Jiang, Ruiqing Hou, Shijie Zhu, Shaokang Guan
Summary: A CaCO3 coating was developed by hydrothermal treatment to enhance the anti-corrosion property of biodegradable magnesium alloy. The coating showed excellent corrosion protection and a possible transformation during immersion.
Article
Chemistry, Physical
Petr Cejpek, Petr Dolezal, Petr Opletal, Jaroslav Valenta, Kristina Vlaskova, Milan Dopita
Summary: With the increase of indium content, the Curie temperature and temperatures of pre-martensitic and martensitic transformation in Ni2MnGa1-xInx samples decrease. No martensitic transformation was observed in our samples with indium content x > 0.05.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Evgenia A. Tereshina-Chitrova, Ladislav Havela, Mykhaylo Paukov, Milan Dopita, Lukas Horak, Oleksandra Koloskova, Zbynek Soban, Thomas Gouder, Frank Huber, Alice Seibert
Summary: The thin U-Mo films and their hydrides prepared by reactive sputter deposition from metallic targets exhibit metallic properties with high electrical resistivity. The films show superconductivity and ferromagnetism, with attributes such as strong texture and negative temperature coefficient of resistivity.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Khrystyna Miliyanchuk, Silvie Maskova-Cerna, Ladislav Havela, Nazar Saidov, Yaroslav Tokaychuk, Milan Dopita, Roman Gladyshevskii
Summary: Hydrogenation effects on the crystal structures and magnetic properties of Tb2Co2Ga, Tb2Co2Ga, and Tb3Co3Ga were studied, revealing that hydrogenation leads to lattice volume expansion, decrease of Curie temperature, and suppression of antiferromagnetic ordering. Tb2Ni2Ga acts as a typical 4f-electron system with dominating RKKY exchange interactions.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Physics, Applied
Amir Mohammad Ahadi, Hana Libenska, Tereza Kosutova, Miroslav Cieslar, Veronika Cervenkova, Dejan Prokop, Milan Dopita, Hynek Biederman, Jan Hanus
Summary: This study presents a method for controlled synthesis of core@shell nanoparticles using a gas aggregation source combined with secondary planar magnetron sputtering with closed field configuration. The results show that the shell thickness can be controlled by tuning the power delivered to the secondary magnetron plasma, and different chemistry and crystallite size can be achieved by adjusting the operation conditions.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Tereza Kosutova, Lukas Horak, Pavel Pleskunov, Jan Hanus, Daniil Nikitin, Peter Kus, Miroslav Cieslar, Ivan Gordeev, Sanja Burazer, Andrei Choukourov, Milan Dopita
Summary: Highly porous structures consisting of niobium nanoparticles (Nb NPs) were prepared using magnetron sputtering and inert gas aggregation method. The morphology of these nanoparticles evolves thermally, with the structure transitioning from amorphous to crystalline with the increase in temperature. Annealing above 600 degrees C causes the coalescence of nanoparticles into large structures.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Tomas Hrbek, Peter Kus, Tereza Kosutova, Katerina Veltruska, Thu Ngan Dinhova, Milan Dopita, Vladimir Matolin, Iva Matolinova
Summary: This study investigated the performance of magnetron sputtered low-loading iridium-ruthenium thin films as catalysts for the Oxygen Evolution Reaction. The results showed that ruthenium-containing catalysts exhibited higher activity, and the Ir-Ru 1:3 sample showed higher activity and less degradation after the procedure. Chemical and structural analysis revealed that the stability of the Ir-Ru 1:3 sample was related to the RuO2 chemical state and hcp structure.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Multidisciplinary Sciences
Michael Hoffmann, Zheng Wang, Nujhat Tasneem, Ahmad Zubair, Prasanna Venkatesan Ravindran, Mengkun Tian, Anthony Arthur Gaskell, Dina Triyoso, Steven Consiglio, Kandabara Tapily, Robert Clark, Jae Hur, Sai Surya Kiran Pentapati, Sung Kyu Lim, Milan Dopita, Shimeng Yu, Winston Chern, Josh Kacher, Sebastian E. Reyes-Lillo, Dimitri Antoniadis, Jayakanth Ravichandran, Stefan Slesazeck, Thomas Mikolajick, Asif Islam Khan
Summary: Crystalline materials with broken inversion symmetry can exhibit spontaneous electric polarization, which can transform a non-polar phase into a polar phase by the application of an electric field. The antiferroelectric transition in ZrO2 causes a negative capacitance, which has potential applications in electronics.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Condensed Matter
C. Meftah, N. Iles, L. Rabahi, M. Gallouze, H. Feraoun, M. Drir
Summary: In this study, ab initio calculations are performed to investigate the partial substitution effect of Rare Earth (RE) elements in Ti2AlC. The results show that (Ti3/2RE1/2)AlC alloys have high resistance to compression and shearing, as well as an increased heat capacity in a certain temperature range. The presence of localized states and the magnetic moment are influenced by the filling of f states of the rare earth elements.
COMPUTATIONAL CONDENSED MATTER
(2022)
Article
Nanoscience & Nanotechnology
Pavel Pleskunov, Vadym Prysiazhnyi, Daniil Nikitin, Tereza Kosutova, Miroslav Cieslar, Ivan Gordeev, Zdenek Krtous, Suren Ali-Ogly, Jan Somvarsky, Mariia Protsak, Kateryna Biliak, Ksenia Kishenina, Antonin Bednarik, Milan Dopita, Jan Preisler, Andrei Choukourov
Summary: Precise molecular identification of specific biomarkers in biological tissues is crucial for accurate diagnostics. In this study, we introduce a new method using monoisotopic niobium nanoparticles as imaging matrices, synthesized without wet chemistry. The niobium nanoparticles form an effective matrix for high-resolution imaging of complex biological samples.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Xianxian Xie, Valentin Briega-Martos, Riccardo Farris, Milan Dopita, Mykhailo Vorokhta, Tomas Skala, Iva Matolinova, Konstantin M. Neyman, Serhiy Cherevko, Ivan Khalakhan
Summary: In this study, Pt-Au alloy catalysts with different compositions were prepared, and their activity and stability were comprehensively studied using various characterization techniques and simulation methods. The results showed that Pt-Au alloy with 10% gold exhibited the most promising activity and stability, effectively suppressing platinum dissolution at high potentials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Amina Boudiaf, Lyacine Rabahi, Leila Rouaiguia, Leila Adnane, Abdelhafid Kellou
Summary: In this study, the magnetic and thermal properties of bcc-Fe0.52MnxCr0.28-xCu0.06Mo0.10C0.012N0.014 (xMn = 5.77, 11.51, and 17.22 wt%) and fcc-Fe0.63MnxCr0.26-xCu0.03Mo0.05C0.006N0.007 (xMn = 8.98, 11.95, and 14.92 wt%) alloys were investigated using pseudo-potential Density Functional Theory (PP-DFT). The results show that the magnetic properties of these alloys depend on the concentration of Mn and the addition of C and N atoms. The presence of C, N atoms does not affect the magnetic coupling between atoms. The quasi-harmonic Debye model successfully predicts the thermal properties of these alloys. The bulk modulus, volume expansion, and Gibbs free energy are significantly influenced by temperature, Mn concentration, and C, N additions in both bcc and fcc alloys, while vibrational entropy is more affected by the bcc-fcc phase transition than by C, N addition and Mn concentration.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Evgenia A. Tereshina-Chitrova, Ladislav Havela, Mykhaylo Paukov, Oleksandra Koloskova, Lukas Horak, Milan Dopita, Mayerling Martinez Celis, Miroslav Cieslar, Zbynek Soban, Thomas Gouder, Frank Huber
Summary: Formation and properties of thin uranium hydride films (UH2 and UH3) synthesized by direct current reactive sputtering were investigated. The films were characterized using various in situ and ex situ techniques. The study revealed the stabilization of non-existent bulk UH2 phase and transient alpha-UH3 phase as well as the common beta-UH3 phase. All hydrides exhibited ferromagnetic behavior with Curie temperatures of approx. 120 K and 170 K for UH2 and UH3 (alpha and beta), respectively. The robust ferromagnetism observed in the thin films was not dependent on the structural details, while the electrical resistivity data indicated disorder in both types of hydrides.
Article
Crystallography
Hiba Azzeddine, Abdelkader Hanna, Achour Dakhouche, Thierry Baudin, Francois Brisset, Yi Huang, Terence G. Langdon
Summary: The microstructure, texture evolution, and corrosion behavior were evaluated and compared for low light rare-earth containing Mg-1.4Nd and low heavy rare-earth containing Mg-0.6Gd and Mg-0.4Dy alloys after high-pressure torsion (HPT) processing and isochronal annealing. The results showed that the Mg-1.4Nd alloy exhibited a heterogeneous deformation microstructure while the Mg-0.6Gd and Mg-0.4Dy alloys had a homogeneous deformation microstructure. The HPT processing resulted in a deviated basal texture in all three alloys. The corrosion resistance of the HPT-processed Mg-RE alloys improved due to grain refinement, but decreased with increasing annealing temperature for the Mg-0.6Gd and Mg-0.4Dy alloys due to increased grain size.
Article
Materials Science, Multidisciplinary
Petr Cejpek, Daria Drozdenko, Kristian Mathis, Ross H. Colman, Milan Dopita, Ladislav Straka, Oleg Heczko
Summary: A Ni50Mn28Ga22 single crystal with 10M martensitic structure was studied under uniaxial tensile stress using in situ X-ray diffraction. When the c axis was aligned with the applied stress, elongation primarily occurred through stress-induced reorientation. However, when the a or b axis was aligned with the stress, elongation was mainly due to changes in lattice parameters and a decrease in modulation amplitude of the 10M martensite. The initial tensile Young modulus was very low and gradually increased with increasing tensile stress, reaching a value of about 0.3 GPa at zero stress.
Article
Engineering, Electrical & Electronic
Kokouvi Etse, Paul Clerico, Laurent Prevond, Anne-Laure Helbert, Thierry Baudin, Xavier Mininger
Summary: Simulation of devices with thin electromagnetic shields is challenging due to the fine mesh and computation time required. The transmission line theory has been revised to solve shielding problems, leading to the development of the artificial material single layer (AMSL) method. This article presents an approach combining the homogenization of multilayer shields through energetic consideration and the second-order AMSL method for accurate modeling of metal composite in magnetic shielding applications. The proposed approach is compared to the AMSL method and Impedance Network Boundary Conditions (INBCs) approach, showing a maximum relative error lower than 8.5% compared to experimental results within the valid frequency range.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(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)