Article
Materials Science, Multidisciplinary
Y. H. Meng, S. Y. Zhang, W. H. Zhou, J. H. Yao, S. N. Liu, S. Lan, Y. Li
Summary: Structural relaxation and subsequent rejuvenation through thermal treatment can improve the plasticity and fracture toughness of metallic glasses. The recovery of loosely packed regions in the atomic structure during annealing contributes to the observed rejuvenation. Tailoring the mechanical properties of metallic glasses can be achieved by controlling the annealing and thermal treatment conditions.
Review
Metallurgy & Metallurgical Engineering
Youhong Peng, Kesong Miao, Wei Sun, Chenglu Liu, Hao Wu, Lin Geng, Guohua Fan
Summary: Characterizing the microstructure and deformation mechanism of metallic materials is crucial for understanding the microstructure-property relationship. Advanced synchrotron radiation facilities have enabled non-destructive visualization of full-field structural information in three dimensions, contributing to significant progress in recent decades. Future innovations in next-generation synchrotron radiation and emerging technologies hold great potential for further advancements in material characterization.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Qing Du, Xiong-Jun Liu, Yihuan Cao, Qiaoshi Zeng, Hui Wang, Yuan Wu, Suihe Jiang, Xiaobin Zhang, Zhao-Ping Lu
Summary: In this study, the chemical dependence of thermally induced reentrant glass transition in (PdNi)(100-x)P-x MGs was systematically investigated. It was found that the reentrant glass transition in alloys with a P content of < 17 at% is suppressed with an increase in P. The composition dependence of the reentrant glass transition originates from the rearrangement of the metal-metalloid bond (i.e., Pd/Ni-P bonds) and the consequent short-range ordering to medium-range ordering.
SCIENCE CHINA-MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Tianding Xu, Xiao-Dong Wang, Eric M. Dufresne, Yang Ren, Qingping Cao, Dongxian Zhang, Jian-Zhong Jiang
Summary: Anomalous fast atomic dynamics were discovered in a metallic glass with good glass forming ability, mainly attributed to the increased mobility of Cu atoms by Ag addition, leading to the formation of structural heterogeneity at the atomic level.
MATERIALS TODAY PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Xuan Ge, Pingsheng Lai, Caijuan Shi, Xiaowei Xu, Jian Wang, Tao Du, Morten M. Smedskjaer, Dongliang Yang, Fan Yang, Wenquan Lu, Jingyu Qin, Jianguo Li, Qiaodan Hu
Summary: Annealed titanate glasses have a flexible network structure that can be modulated by annealing temperature, which is different from the structural changes in traditional network glasses. The rearrangement of the network in barium dititanate glass occurs in a non-monotonic, two-stage process. The irreversible change in network connectivity is attributed to the development of crystal-like cationic motifs.
Article
Materials Science, Ceramics
Xi Zhao, Si Lan, Lina Hu, Zhenduo Wu, Yaqiang Dong, Yang Ren, Xun-Li Wang
Summary: This study reveals the magnet-influenced beta relaxation in Fe-based metallic glasses and its interaction with magnetic ordering, and finds a two-stage relaxation behavior with the pinning effect of Curie temperature in the first stage and its disappearance in the second stage.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Nanoscience & Nanotechnology
Elis Sjogren-Levin, Wolfgang Pantleon, Aylin Ahadi, Zoltan Hegedus, Ulrich Lienert, Nobuhiro Tsuji, Kei Ameyama, Dmytro Orlov
Summary: In situ X-ray diffraction was used to study the tensile deformation behavior of HS nickel, which consists of a continuous network of fine grains and islands of coarse grains. A separation algorithm was developed to analyze the X-ray diffraction signals from coarse and fine grains separately. Line profile analysis was used to examine the evolution of local stresses and microstrains in different grain fractions. The study identified several stages during yielding and the onset of plastic deformation in HS nickel, and found that the plastic deformation of coarse grains is constrained by the network of fine grains.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Keiji Itoh
Summary: The static structure of (Li2S)(x)(GeS2)(100-x) glasses was studied using diffraction measurements and simulation techniques. It was found that the Ge-S network in the glasses is formed by GeS4 tetrahedra linkages. The number of edge-sharing GeS4 tetrahedra decreases with Li2S content, but the ratio to the number of connections remains constant regardless of the composition. Molecular dynamics simulation was used to determine the positions of Li ions in the Ge-S network, showing that each Li ion occupies a deformed octahedral site.
SOLID STATE IONICS
(2022)
Article
Metallurgy & Metallurgical Engineering
Zeng Qiaoshi, Yin Ziliang, Lou Hongbo
Summary: Metallic glasses possess unique properties due to their densely packed and disordered atomic structures. Recent studies have shown polyamorphic transitions in metallic glasses, sparking excitement and interest in understanding their underlying mechanisms and property changes. These transitions offer new possibilities for tunable properties in materials science.
ACTA METALLURGICA SINICA
(2021)
Article
Nanoscience & Nanotechnology
Alexander Firlus, Mihai Stoica, Gavin B. M. Vaughan, Robin E. Schaeublin, Joerg F. Loeffler
Summary: Fe-based bulk metallic glasses exhibit an anomalously low coefficient of thermal expansion known as the Invar effect. This effect is influenced by rare earth elements but the extent of influence from other elements is unclear.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Physical
Stefan Michalik, Zuzana Molcanova, Michaela Sulikova, Katarina Kusnirova, Pal Jovari, Jacques Darpentigny, Karel Saksl
Summary: The Mg-Zn-Ca system was investigated for its glass-forming ability by fabricating ribbon specimens using melt-spinning technique with a concentration line of 7 at.% calcium. The samples were characterized to determine their mass density, hardness, elastic modulus, and crystallisation temperatures. Pair distribution functions obtained by HEXRD and ND measurements described the amorphous structure, revealing contributions of Mg-Mg, Mg-Zn, and Zn-Zn pairs. In situ HEXRD showed the transformation process from amorphous to crystalline structure for Mg60Zn33Ca7 and Mg50Zn43Ca7, proposing the formation of intermetallic compounds IM1 and IM3 as well as hcp-Mg phase in multiple crystallisation events.
Article
Chemistry, Physical
Shigeharu Takagi, Keiji Shimoda, Jun Haruyama, Hisao Kiuchi, Ken-ichi Okazaki, Toshiharu Fukunaga, Zempachi Ogumi, Takeshi Abe
Summary: In this study, operando structural analyses of graphite electrode in lithium-ion batteries were performed using neutron diffraction and synchrotron radiation X-ray diffraction. The results provide insights into the phase evolution and structural transition of lithium-intercalated graphite. The study reveals that the in-plane structure of graphite transitions from LiC6-type to LiC9-type during lithium de-intercalation, and the LiC9-type arrangement is retained in Li-poor phases. This research is significant for understanding the structural changes in lithium-ion battery materials.
Article
Materials Science, Multidisciplinary
Antoine Cornet, Gaston Garbarino, Federico Zontone, Yuriy Chushkin, Jeroen Jacobs, Eloi Pineda, Thierry Deschamps, Shubin Li, Alberto Ronca, Jie Shen, Guillaume Morard, Nico Neuber, Maximilian Frey, Ralf Busch, Isabella Gallino, Mohamed Mezouar, Gavin Vaughan, Beatrice Ruta
Summary: By combining the brightest x-rays available in synchrotrons with cutting edge high pressure technologies, this study provides direct evidence of the microscopic structural and dynamical mechanisms occurring under in-situ high pressure compression and decompression in metallic glasses. The results show that while pressure promotes density increasing through quasi-elastic structural deformations, the atomic mobility exhibits a hysteresis and is enhanced up to a factor 15 even at temperatures well below the glass transition. This surprising behavior results from a competition between fast avalanche-like atomic rearrangements and slow relaxation processes triggered by an anomalous super-diffusive collective particle displacement.
Article
Chemistry, Physical
Daria Lazurenko, Victor V. Lozanov, Andreas Stark, Florian Pyczak, Alexey A. Ruktuev, Kemal Emurlaev, Lin Song, Ivan A. Bataev, Ivan Ivanov, Tatiana S. Ogneva, Anatoly A. Bataev
Summary: Ti-Al3Ti composites have attracted attention for their outstanding mechanical properties, but limited by the low ductility and fracture toughness of Al3Ti phase. This study discusses stabilizing the L1(2) structure of titanium trialuminide as a promising way to improve composite properties, with Zn and Ag found to be the most efficient stabilizers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Sven E. Gustafson, Darren C. Pagan, Paul A. Shade, Michael D. Sangid
Summary: Elastic micromechanical fields of a nickel-based superalloy polycrystal are tracked using high energy X-ray diffraction microscopy (HEDM) to determine intragranular deformation metrics during cyclic high temperature loading. Results show that elevated temperatures lead to complex interactions among grains, with greater recovery observed at higher temperatures.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
M. Varga, L. Galdun, B. Kunca, V. Vega, J. Garcia, V. M. Prida, E. D. Barriga-Castro, C. Luna, P. Diko, K. Saksl, R. Varga
Summary: This study presents the magnetic characterization of ferromagnetic Ni-Fe-Ga shape memory nanowires using temperature-dependent FORC analysis. The FORC analysis confirms the uniform and homogeneous nature of the nanowires array and supports the ferromagnetic shape memory behavior and structural transformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
B. Putz, O. Milkovic, G. Mohanty, R. Ipach, L. Petho, J. Milkovicova, X. Maeder, T. E. J. Edwards, P. Schweizer, M. Coduri, K. Saksl, J. Michler
Summary: The first-time combinatorial synthesis of thin film metallic glass libraries via magnetron co-sputtering at the limit of crystallinity was reported. Two phases, including an untextured amorphous Cu51Zr14 phase and a textured nanocrystalline alpha-Zr phase, were identified in the films. The phase mixture observed in the film is not permitted in the Cu-Zr phase diagram and contradicts existing literature. The cluster size and composition of the amorphous phase remain constant, while the crystallite size and texture of the nanocrystalline alpha-Zr phase change with increasing Zr content.
MATERIALS & DESIGN
(2022)
Article
Multidisciplinary Sciences
Alexander Firlus, Mihai Stoica, Stefan Michalik, Robin E. Schaeublin, Joerg F. Loeffler
Summary: The Invar effect in Fe-based bulk metallic glasses is widely observed, but its manifestation at the atomic scale is not well understood. In this study, in-situ X-ray diffraction was used to investigate the structural transformations of two bulk metallic glasses, revealing that the Invar effect is consistent with macroscopic thermal expansion and correlated with Fe-Fe pair distance.
NATURE COMMUNICATIONS
(2022)
Article
Instruments & Instrumentation
James A. D. Ball, Anna Kareer, Oxana Magdysyuk, Stefan Michalik, Anastasia Vrettou, Neal Parkes, Thomas Connolley, David M. Collins
Summary: This study demonstrates the feasibility of using three-dimensional X-ray diffraction (3DXRD) at the I12 beamline of Diamond Light Source. A low-carbon ferritic steel was investigated using a processing pipeline specifically designed for this beamline. The orientation measurements were validated independently and showed comparable results with other 3DXRD instruments. The study also revealed the potential of applying 3DXRD to previously unexplored scientific areas due to the flexible and open architecture of the I12 beamline.
JOURNAL OF SYNCHROTRON RADIATION
(2022)
Article
Chemistry, Multidisciplinary
Beata Ballokova, Marian Lazar, Natalia Jasminska, Zuzana Molcanova, Stefan Michalik, Tomas Brestovic, Jozef Zivcak, Karol Saksl
Summary: In this study, copper filters developed using powder technology were tested for their performance and microstructure. The results showed that the pressure loss values of the filters were suitable for use in half-face masks that meet the requirements of European norms.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Zuzana Molcanova, Beata Ballokova, Wanda Mizenkova, Miroslav Dzupon, Dora Zalka, Karel Saksl
Summary: The effect of yttrium substitution on the mechanical properties of magnesium alloys was studied. It was found that moderate yttrium substitution can improve the ultimate compressive strength of the alloy and reduce the corrosion rate.
KOVOVE MATERIALY-METALLIC MATERIALS
(2022)
Article
Engineering, Manufacturing
Yuanbo T. Tang, Chinnapat Panwisawas, Benjamin M. Jenkins, Junliang Liu, Zhao Shen, Enrico Salvati, Yilun Gong, Joseph N. Ghoussoub, Stefan Michalik, Bryan Roebuck, Paul A. J. Bagot, Sergio Lozano-Perez, Chris R. M. Grovenor, Michael P. Moody, Alexander M. Korsunsky, David M. Collins, Roger C. Reed
Summary: A supersaturated y phase microstructure is produced in Ni-based superalloys using laser powder bed fusion (L-PBF) technology. The cooling rate from the process suppresses the solid-state precipitation of the y ’ phase. This study investigates the behavior of the material during heat treatment and sheds light on the manipulation of the y ’ precipitate distribution for tailoring microstructure in additively manufactured superalloys.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Physical
Andrea Lachova, Mihai Stoica, Stefan Michalik, Petre F. Gostin, Masako Fujioka-Kobayashi, Benoit Schaller, Joerg F. Loeffler, Pavol Sovak
Summary: Different geometries (wedges, rods, ribbons, and discs) of Ti40Zr10Cu32Pd14Ga4 and Ti40Zr10Cu32Pd14Sn4 bulk metallic glasses (BMGs) were prepared using suction casting, melt spinning, and splat quenching methods. X-ray diffraction measurements showed that the critical casting thickness of the Sn-containing BMG is at least 4 mm, higher than the Ga-containing BMG (2.1 mm) and the reference BMG (2.4 mm). Differential scanning calorimetry revealed a larger supercooled liquid region for glassy rods and ribbons compared to splat-quenched discs. The mechanical properties showed that the Ga-containing BMG has a higher plastic strain and a lower Young's modulus than the Sn-containing BMG and the reference BMG. Corrosion tests demonstrated that Ti40Zr10Cu32Pd14Sn4 has the highest pitting resistance among the BMGs tested. The Ga-containing BMG showed excellent biocompatibility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Stefan Michalik, Zuzana Molcanova, Michaela Sulikova, Katarina Kusnirova, Pal Jovari, Jacques Darpentigny, Karel Saksl
Summary: The Mg-Zn-Ca system was investigated for its glass-forming ability by fabricating ribbon specimens using melt-spinning technique with a concentration line of 7 at.% calcium. The samples were characterized to determine their mass density, hardness, elastic modulus, and crystallisation temperatures. Pair distribution functions obtained by HEXRD and ND measurements described the amorphous structure, revealing contributions of Mg-Mg, Mg-Zn, and Zn-Zn pairs. In situ HEXRD showed the transformation process from amorphous to crystalline structure for Mg60Zn33Ca7 and Mg50Zn43Ca7, proposing the formation of intermetallic compounds IM1 and IM3 as well as hcp-Mg phase in multiple crystallisation events.
Article
Materials Science, Multidisciplinary
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Superelastic alloys based on Ti-Nb have the potential for vibration damping applications in the aerospace sector due to their wide mechanical hysteresis and tuneable properties. However, their adoption is limited by functional fatigue, which results in a degradation of properties with cyclic loading. By using a combination of ex situ and in situ testing, it was found that the behavior of these alloys changes through a two-step mechanism driven by the accumulation of transformation related defects and their associated stress fields. This understanding explains discrepancies in the literature and highlights the dominant role of specific regions in shaping the load response of these alloys.
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Chemistry, Physical
Wanda Mamrilla, Zuzana Molcanova, Beata Ballokova, Miroslav Dzupon, Robert Dzunda, David Csik, Stefan Michalik, Maksym Lisnichuk, Karel Saksl
Summary: This study focuses on the preparation and characterization of zinc-based alloys containing magnesium, calcium, and manganese. The materials were prepared by melting pure elements, casting them into graphite molds, and thermo-mechanically treating them via hot extrusion. The phase compositions and mechanical properties of the alloys were analyzed using various techniques. The results provide valuable insights into the microstructural changes and mechanical behavior of these zinc-based alloys, which can be used for designing alloys for specific biomedical applications.
Article
Materials Science, Multidisciplinary
David Csik, Gabriela Baranova, Robert Dzunda, Dora Zalka, Ben Breitung, Maria Hagarova, Karel Saksl
Summary: A high entropy composite coating was synthesized by oxidizing a high entropy alloy, AlCrFeCoNi, at high temperatures in a pure oxygen atmosphere. The coating consisted of a spinel-structured high entropy oxide and a metallic phase with a face-centered cubic structure, improving the electrical conductivity and electrochemical performance. The material showed excellent regeneration efficiency and high discharge capacity in lithium-ion batteries, making it a promising anode active material.
Article
Materials Science, Multidisciplinary
M. Micoulaut, I Pethes, P. Jovari, L. Pusztai, M. Krbal, T. Wagner, V Prokop, S. Michalik, K. Ikeda, I Kaban
Summary: The structural properties of two Ge-As-Se glass compositions were investigated using molecular dynamics simulations and scattering experiments. The increase of (As,Ge) content led to an increase in ring structures, with As-As and As-Ge bonds favored over Ge-Ge bonds. The topological and chemical features of these glasses differ from related binary compositions, and the vibrational isocoordination rule is only valid for the Se-rich composition.
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)
