Article
Materials Science, Multidisciplinary
Hamid Tazikeh, Seyyed Ehsan Mirsalehi, Ali Shamsipur
Summary: This research investigated the vacuum transient liquid phase bonding of Inconel 939 superalloy using an amorphous Ni-Cr-Fe-Si-B filler alloy at various temperatures. The study focused on the microstructure and mechanical properties of the joints. The results revealed the presence of three distinct regions in the bonding area, namely athermal solidification, isothermal solidification, and diffusion affected zones. The different regions exhibited variations in their structure and hardness, with the bonding temperature directly influencing the hardness and joint efficiency of the isothermal solidification zone.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
D. Kokabi, A. Kaflou, H. R. Rastifard
Summary: This study investigates the microstructure and mechanical properties of dissimilar brazing of gamma-TiAl/IN738 superalloy using two different filler metals. A thicker continuous brittle phase in the IN738/Cu/TiAl joint led to lower mechanical properties compared to the IN738/Ni-Si-B/TiAl joint. Fracture occurred in the Reaction Layer(TiAl interface and the RL/Solidified zone(SZ) interface of the joints using Ni-Si-B and Cu filler metals, respectively, with Ni-Si-B filler metal exhibiting higher shear strength by 20%.
MATERIALS SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Ateekh Ur Rehman, Nagumothu Kishore Babu, Mahesh Kumar Talari, Saqib Anwar, Yusuf Usmani, Ali M. Al-Samhan
Summary: This study successfully addressed the carbon enrichment issue in dissimilar metal welding using solid-state friction welding, producing defect-free weldment. The grain refinement in the welding region resulted in the highest hardness at the Inconel 718/F22 weld interface. In tensile tests, the Inconel 718/F22 welds exhibited lower toughness compared to those prepared with an Inconel 625 interlayer.
APPLIED SCIENCES-BASEL
(2021)
Article
Metallurgy & Metallurgical Engineering
Jianguo Chen, Ji Dong, Yushun Wei, Yong Guo, Xuan Wang
Summary: Transient liquid phase (TLP) bonding was successfully used to join Inconel 718 alloy at different temperatures, resulting in different microstructures and mechanical properties of the joints. The increase in bonding temperature led to the enlargement of grain and boride precipitates, which caused the deterioration of the mechanical properties of the joints.
WELDING IN THE WORLD
(2023)
Article
Metallurgy & Metallurgical Engineering
Dariush Kokabi, Ali Kaflou
Summary: This study investigates the microstructural evolution during dissimilar brazing of gamma-TiAl intermetallic with a Ni-based superalloy using a novel high-entropy quinary amorphous filler alloy. Three distinct zones were identified in the joint region, including a reaction layer, a diffusion zone, and a centerline solidified zone. Intermetallic compounds were formed in the reaction layer, while specific phases precipitated discontinuously in the gamma-Ni matrix of the IN718 substrate.
WELDING IN THE WORLD
(2021)
Article
Materials Science, Multidisciplinary
Lin Yuan, Jin Ren, Jiangtao Xiong, Wei Zhao, Junmiao Shi, Jinglong Li
Summary: A new filler material without traditional melting-point depressants was used in transient liquid phase bonding of a directionally solidified superalloy. The joint was composed of three zones with different microstructures and the isothermal solidification of the filler helped to eliminate segregation and improve tensile strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Manufacturing
A. K. Sahu, S. Bag
Summary: In this study, a high-power CO2 laser welding system was used to weld Inconel and stainless steel, and a finite element thermal model was employed to analyze the temperature distribution and solidification parameters in the weld zone. It was found that the formation of intermetallic phases during welding was correlated with the solidification parameters and segregation of principal alloying elements. The amount of intermetallic phases in the weld zone was estimated by XRD analysis. With an increase in heat input, the solidification mode changed from columnar to equiaxed dendrites, resulting in a reduction in intermetallic formation. The reduction in intermetallic particles improved the joint efficiency of the laser welding system.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Article
Materials Science, Multidisciplinary
R. Y. Zhang, H. L. Qin, Z. N. Bi, Y. T. Tang, J. Araujo de Oliveira, T. L. Lee, C. Panwisawas, S. Y. Zhang, J. Zhang, J. Li, H. B. Dong
Summary: In this study, the gamma '' variant distribution in Inconel 718 samples was tailored through ageing heat treatment, and the variant-sensitive deformation behavior was studied through in situ tensile tests using neutron diffraction. The results showed that the yield strength varied with different gamma '' variant distributions, which can be attributed to the interactions between dislocations and different gamma '' variants.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Guoying Li, Zhanqiang Liu, Bing Wang, Mingze Xin
Summary: This study demonstrates the mechanism of Te damage to Inconel 718 through innovative solid-state infiltration of Te, showing that different Te infiltration temperatures result in varied intermetallic compounds. The weakening effect of the new intermetallic compounds relative to grain boundaries is triple, including its own low hardness, low density and large volume leading to grain boundary expansion.
Article
Materials Science, Multidisciplinary
Muhammad Ahmed Rabbani, Massab Junaid, Tauheed Shehbaz, Fahd Nawaz Khan
Summary: The lap joints of CpTi/Inconel-718 were obtained using diffusion bonding at 1020°C for 1.5 hours. Microstructural and chemical composition analysis revealed that the CpTi region near the interface transformed into ll-Ti and subsequently exhibited a region of a-Ti Widmanstatten needles in a matrix of ll-Ti. This transformation was attributed to the diffusion of ll-stabilizers from the Inconel side. The average shear strength of the DB CpTi/Inconel-718 joints was measured to be 223 MPa, higher than the conventional Pulsed TIG weldment of CpTi/Inconel-718 using interlayers.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Metallurgy & Metallurgical Engineering
Ali Izadi Ghahferokhi, Masoud Kasiri-Asgarani, Kamran Amini, Reza Ebrahimi-kahrizsangi, Mahdi Rafiei
Summary: Dissimilar transient liquid phase (TLP) bonding of GTD-111 and IN-718 nickel-based superalloys was investigated using BNi-9 as an interlayer at 1100 degrees C. The study showed that the bonding time affects the microstructure and mechanical properties of the TLP-bonded specimens. Micro-hardness investigations revealed a decrease in hardness with the completion of isothermal solidification, while shear strength test results demonstrated an increase in shear strength with incrementing bonding time.
WELDING IN THE WORLD
(2021)
Article
Materials Science, Multidisciplinary
Jianhao Wang, Xunda Liu, Fupeng Huo, Kento Kariya, Noriyuki Masago, Hiroshi Nishikawa
Summary: A novel TLP bonding method using In-coated Cu sheet was designed for high-temperature die attach, showing significant improvement in the mechanical properties of joints bonded under different parameters, although the brittle characteristics and location of the fracture remained almost unchanged for the different bonding parameters.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Physical
Siliang He, Bifu Xiong, Fangyi Xu, Biyang Chen, Yinhua Cui, Chuan Hu, Gao Yue, Yu-An Shen
Summary: This study proposes a low-temperature transient liquid phase bonding (TLPB) method using Sn58Bi/porous Cu/Sn58Bi to enable efficient power-device packaging at high temperatures. The bonding mechanism is attributed to the rapid reaction between porous Cu and Sn58Bi solder, leading to the formation of intermetallic compounds with high melting point at low temperatures. The effects of bonding atmosphere, bonding time, and external pressure on the shear strength of metal joints are investigated. Under formic acid (FA) atmosphere, Cu6Sn5 forms at the porous Cu foil/Sn58Bi interface, and some of it transforms into Cu3Sn. External pressure significantly reduces the micropores and thickness of the joint interconnection layer, resulting in a ductile fracture failure mode. The metal joint obtained under a pressure of 10 MPa at 250 degrees C for 5 min exhibits outstanding bonding mechanical performance with a shear strength of 62.2 MPa.
Article
Materials Science, Multidisciplinary
V. Ajay, M. Naveen Kumar, N. Kishore Babu, T. Mahesh Kumar, K. Vamshi Krishna, G. Madhusudan Reddy
Summary: Nickel-based superalloy Inconel 718 and austenitic stainless steel AISI 304 were joined by rotary friction welding, and the changes in microstructure and mechanical properties of the dissimilar joint were studied under different heat treatment conditions. Two distinct microstructural zones, FDZ and TMAZ, were observed in all weldments. The post-weld aged sample exhibited the highest tensile strength and hardness due to the precipitation of strengthening precipitates. The solution-treated sample had the highest yield strength, while the solutionising + aging treatment deteriorated the mechanical properties of the dissimilar joint. The observed changes in mechanical properties were investigated based on microstructure and electron dispersive spectroscopy.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
D. Praveen Kumar, S. Kumaran
Summary: In this study, the spark plasma sintering technique was used to join 17-4 martensitic precipitation hardened stainless steel with Inconel 718. The results showed that the diffusion of elements affected the hardness and tensile strength, and the presence of precipitates and carbides deteriorated the hardness and tensile properties of the bond zone. In addition, electrochemical testing revealed a slight decrease in the corrosion resistance of the 17-4 stainless steel after diffusion bonding.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Majid Samavatian, Reza Gholamipour, Vahid Samavatian
Summary: In this study, a correlation-based neural network approach was developed to design potential new bulk metallic glasses by predicting alloy compositions and properties. The effects of microalloying on glass forming possibility were investigated and a quaternary system, ZrCoAlNi, with extended high glass forming possibility area, was predicted. The established framework offers a roadmap for potential applications in the development of new quaternary bulk metallic glass alloys.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
D. Kokabi, A. Kaflou, H. R. Rastifard
Summary: This study investigates the microstructure and mechanical properties of dissimilar brazing of gamma-TiAl/IN738 superalloy using two different filler metals. A thicker continuous brittle phase in the IN738/Cu/TiAl joint led to lower mechanical properties compared to the IN738/Ni-Si-B/TiAl joint. Fracture occurred in the Reaction Layer(TiAl interface and the RL/Solidified zone(SZ) interface of the joints using Ni-Si-B and Cu filler metals, respectively, with Ni-Si-B filler metal exhibiting higher shear strength by 20%.
MATERIALS SCIENCE AND TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Dariush Kokabi, Ali Kaflou
Summary: This study investigates the microstructural evolution during dissimilar brazing of gamma-TiAl intermetallic with a Ni-based superalloy using a novel high-entropy quinary amorphous filler alloy. Three distinct zones were identified in the joint region, including a reaction layer, a diffusion zone, and a centerline solidified zone. Intermetallic compounds were formed in the reaction layer, while specific phases precipitated discontinuously in the gamma-Ni matrix of the IN718 substrate.
WELDING IN THE WORLD
(2021)
Article
Materials Science, Ceramics
Sajad Sohrabi, Reza Gholamipour
Summary: The addition of a small amount of Nb in the metallic glass samples studied resulted in a lower crystallization activation energy, indicating that Nb microalloying makes crystallization transformation easier. Moreover, the Nb minor addition delayed the onset of crystallization but accelerated the crystallization progress, resulting in a narrower crystallization transformation region. Additionally, the Avrami exponents for both non-isothermal and isothermal conditions were higher in the Nb-containing sample, indicating increased nucleation rates in this glassy alloy.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Metallurgy & Metallurgical Engineering
Morteza Mahmoodan, Reza Gholamipour, Sajad Sohrabi
Summary: The study investigated the effect of Nb addition on mechanical behavior and glass formation in bulk metallic glasses. Addition of 2% Nb improved glass forming ability and plasticity, while 4% Nb deteriorated these properties. The findings highlight the importance of minor alloying elements in the formation and mechanical properties of bulk metallic glasses.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2021)
Article
Materials Science, Multidisciplinary
Hamed Kaypour, Said Nategh, Reza Gholamipour, Alireza Khodabandeh
Summary: The crystal structure of AlxMnCrCoFeNi alloys was determined to be FCC solid solution or ordered B2 precipitates, with twins playing a role in the deformation mechanism.
Through hot compression tests, the constitutive equation of the alloy, the relationship between work hardening rate and dislocation annihilation coefficients, and the effect of Al addition on initiation temperature of necklace structure were confirmed.
The addition of Al not only increased the initiation temperature of necklace structure, but also indicated the presence of twin deformation mechanism in the alloy.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
D. Kokabi, A. Kaflou, R. Gholamipour, M. Pouranvari
Summary: This paper investigates the correlation between the process, microstructure, and strength during dissimilar brazing of TiAl alloy to IN738 Ni-based superalloy using Ni-4Si-3.2B filler metal. The solid/liquid reactions, solidification phenomena, and solid-state phenomena are analyzed. It is found that the sizes of the athermally solidified zone and reaction layer are two key factors controlling the joint strength. The bonding temperature and holding time can be characterized using the Larson-Miller parameter (LMP), and the shear strength of the joint can be formulated regarding LMP. The highest shear strength is achieved with the optimum value of LMP.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Majid Samavatian, Reza Gholamipour, Dmitry Olegovich Bokov, Wanich Suksatan, Vahid Samavatian, Morteza Mahmoodan
Summary: In this study, a machine learning model was developed to predict the energy dissipation distribution on the surface of metallic glasses. It was found that high, low, and moderate energy regions exhibit different behavior patterns.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Amir Ijadi, Behzad Nayebi, Nader Parvin, Ali Kaflou
Summary: The study investigates the interfacial phenomena and their influence on the sintering behavior, microstructure, and mechanical properties of porous stainless steel 316L containing Sn additive. The sintering process was carried out at different temperatures (1250°C and 1300°C) under a nitrogen atmosphere. It was found that the presence of Sn improved atomic diffusion through liquid phase sintering, but negatively affected neck formation. The best combination of mechanical properties was achieved in the samples containing 2 wt% Sn. Fracture investigations, phase analysis, and EDS elemental analysis were conducted to discuss the obtained mechanical properties and compressive strength of the samples.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
E. Ganjeh, A. Kaflou, K. Shirvani
Summary: This study investigates the mechanical properties and thermal aging behavior of nickel super alloys and intermetallic compounds as candidate materials for the turbine industry. The optimum joint bonding strength was achieved at 1100 degrees C-180 min, and XRD analysis revealed the presence of nickel solid solution matrix containing BNi3 and Ni3Si compounds. The ultimate tensile strength at 800 degrees C and 900 degrees C was 36.5 +/- 1 MPa and 20.5 +/- 1 MPa, respectively. Fracture occurred in the IMC substrates due to shrinkage porosity and lattice mismatch with the matrix. Thermal aging at 900 degrees C generated TCP phases in Hastelloy X.
Article
Nanoscience & Nanotechnology
Elham Mohagheghpour, Marjan Rajabi, Reza Gholamipour, Sakineh Hosseinabadi
Summary: This study investigated the growth kinetics and optical properties of amorphous carbon (a-C) nanolayers deposited on glass substrates using ion beam sputtering deposition technique. The results showed that the surface roughness of thin films follows a fractal scaling law, and the growth process obeys the rules of the Wolf-Villain model. Additionally, it was observed that the optical band gap decreases with reducing surface roughness during thin film growth.
INTERNATIONAL JOURNAL OF NANO DIMENSION
(2021)
Article
Engineering, Multidisciplinary
E. Mohagheghpour, M. M. Larijani, M. Rajabi, R. Gholamipour
Summary: The study demonstrates that deposition of silver particles on DLC films can enhance the wettability and reflectivity performance, reduce surface free energy, while maintaining optical transmittance.
INTERNATIONAL JOURNAL OF ENGINEERING
(2021)
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)
