Article
Chemistry, Physical
Yuki Ikeda, Masahiko Nishijima, Takanori Kiguchi, Toyohiko J. Konno
Summary: The crystal structure of martensite in Cu-27at.%Zn-9.0 at.%Al alloy was studied using HAADF-STEM and GPA, revealing changes in atomic rearrangements during martensitic transformation. The coherent interface between the phases with a slight tilt in the basal plane was also observed.
Article
Materials Science, Multidisciplinary
A. Sibirev, E. Ubyivovk, S. Belyaev, N. Resnina
Summary: This study examined the peculiarities of the movement of martensite interfaces in a NiTi alloy during the forward and reverse transformations using in situ transmission electron microscopy. The results showed that the sequence of martensite shrinking on heating was not the opposite of the sequence of martensite formation on previous cooling, and the formation sequence during the second cooling was different from the first cooling. Additionally, dislocations did not hinder martensite formation nor aid in nucleation and growth.
Article
Nanoscience & Nanotechnology
Junyu Chen, Liping Lei, Gang Fang, Dongwei Wang
Summary: This study investigates the grain size dependence of the elastocaloric effect of NiTi and finds a suitable grain size that yields good cooling properties. The grain size has different effects on various refrigeration metrics, such as adiabatic temperature variation, isothermal entropy change, energy dissipation, cyclic stability, and working temperature span. The 30 nm grain size specimen demonstrates excellent comprehensive performance and repeatability, making it a promising elastocaloric refrigerant candidate.
MATERIALS TODAY NANO
(2023)
Article
Materials Science, Multidisciplinary
Y. Chen, M. Klinger, J. Duchon, P. Sittner
Summary: The study investigates the stress deformation and high temperature heating process of NiTi shape memory wire through martensitic transformation at low temperature. It is found that plastic deformation involving dislocation slip and twinning triggers the metal structure transformation in martensite, and the impact on functionality in engineering applications is discussed.
Article
Materials Science, Multidisciplinary
Xiaohui Bian, Ludek Heller, Lukas Kaderavek, Petr Sittner
Summary: The tensile deformation behavior of nanocrystalline NiTi wire in the martensite state was investigated, revealing its superelasticity and plastic deformation capability. The wire also exhibited the ability to refine the austenitic microstructure during the deformation process.
APPLIED MATERIALS TODAY
(2022)
Article
Thermodynamics
Xueshi Li, Siyuan Cheng, Qingping Sun
Summary: This study presents a compact and miniature elastocaloric air cooler using NiTi material, demonstrating its good cooling performance and potential for development.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
K. E. Freiberg, M. Seyring, R. Wonneberger, M. Rettenmayr, A. Undisz
Summary: Upon exposure to oxygen, NiTi forms a Ti-rich surface oxide layer, and a Ni-enriched zone forms below the oxide. The properties of NiTi, such as the release of Ni and resistance to crack initiation and propagation, are affected by both the surface oxide layer and the Ni-enriched zone. However, little is known about the crystallinity, phase, and composition evolution of the Ni-enriched zone. This study utilized nano beam electron diffraction to show that phase transformations in the Ni-enriched zone occur much earlier than previously documented.
Article
Nanoscience & Nanotechnology
K. N. Chaithanya Kumar, Atharva Pagare, H-G Brokmeier, M. Sankar, Nobert Schell, K. S. Suresh
Summary: The in-situ deformation of Ni rich NiTi shape memory alloy was characterized using synchrotron diffraction. The study found that applied stress affects the texture of material and restricts the stress induced martensitic transformation. A strong lattice correspondence between the austenite and martensite phases along with a strong variant selection was observed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Review
Materials Science, Multidisciplinary
Fuzhen Sun, Xinxin Feng, Haizhen Wang, Xinjian Cao, Xiao Liu, Yang Liu, Yan Li, Zhongli Liu, Xiaoyang Yi
Summary: Shape memory alloys are smart materials that have superior properties and are widely used in aerospace, naval, automobile, and biomedicine industries. Functionally graded shape memory alloys are created to achieve accurate controllability for progressive movement. This review paper discusses the classification, fabrications, microstructural features, and performances of functionally graded shape memory alloys. Creating various gradients in shape memory alloys can widen the transformation temperature intervals and transformation stress intervals, leading to excellent performances and wider application range.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
E. Alarcon, L. Heller, E. de Prado, J. Kopecek
Summary: This work analyzed the effects of temperature and microstructure on the tensile behavior of superelastic NiTi wires. Cold-drawn NiTi wires with different final heat treatments were subjected to temperature gradients, and the deformation processes and microstructure changes were characterized. The results showed that the stress of localized martensitic transformation stabilized with increasing temperature, while the volume fraction of martensite decreased. Ductility exhibited a non-monotonic evolution with temperature, with higher ductility observed in samples with more microstructure recovery or recrystallization.
MATERIALS & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Jiang Jiang, Shijie Hao, Daqiang Jiang, Xiaobin Shi, Yang Ren, Lishan Cui
Summary: In this study, the cyclic deformation behaviors of an in-situ Nb nanowire reinforced NiTi shape memory alloy composite were analyzed. The results showed localized hardening in the Nb nanowire and corresponding relaxation in the NiTi matrix during stress-induced martensitic transformation. This indicated a phase load transfer from the transformed NiTi to the Nb nanowire. The study also proposed a self-propagating transformation process that occurs under an average phase stress lower than the critical transformation stress, which may be responsible for the Luders-like deformation of the composite. The change in deformation mode from localized deformation to homogeneous deformation after the first tensile cycle was attributed to plastic deformation in the Nb nanowire and the formation of an internal stress gradient field in the NiTi during pseudoelastic cycling.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Dingshan Liang, Qiuhong Wang, Kangjie Chu, Junyu Chen, Peng Hua, Fuzeng Ren, Qingping Sun
Summary: This study reports the ultrahigh fatigue life of nanocrystalline NiTi tubes, exceeding 120 million cycles, with stable cyclic stress-strain responses and a stable adiabatic temperature drop. The high resistance to nucleation and growth of compression-parallel cracks contributes to the ultrahigh fatigue life of the tubes.
APPLIED MATERIALS TODAY
(2022)
Article
Nanoscience & Nanotechnology
Hongyang Lin, Peng Hua, Qingping Sun
Summary: Grain refinement and partial amorphization can significantly improve the elastocaloric cooling performance of NiTi materials by reducing adiabatic temperature change, enhancing coefficient of performance (COP), and increasing cyclic stability.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Peng Hua, Hongyang Lin, Qingping Sun
Summary: The study demonstrates that micropillar polycrystalline superelastic NiTi has a longer fatigue life under compressive stresses of 1 GPa and 1.5 GPa compared to bulk polycrystalline NiTi samples. This is attributed to the elimination of internal micro-voids and surface scratches in the micropillars, which suppress crack nucleation and propagation mechanisms.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Sam Bakhtiari, Yingchao Li, Satyajit Sarkar, Hong Yang, Lishan Cui, Yinong Liu
Summary: This study investigated the effect of tensile deformation on the transformation behaviour of NiTi within the constrained environment of NiTi-Nb composites. The presence of a second phase within the NiTi matrix hinders the lattice distortion martensitic transformation, and after deformation, the NiTi-Nb microparticle composite exhibited the highest stabilisation effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Tianci Cao, Xiaopeng Cheng, Mingming Wang, Junxia Lu, Jiajia Niu, Huan Liu, Xianqiang Liu, Yuefei Zhang
Summary: In this study, a three-dimensional Li+ conductive skeleton is constructed on the surface of Ni foam by coating Li3PO4 (LPO) through atomic layer deposition (ALD). The Li metal anode with the activated skeleton shows excellent battery cycling stability and enhanced rate performances. By constructing a mixed conductive network, the Li electrode breaks through the limit of the local surface reaction and provides a new insight into achieving dendrite-free Li metal anodes through holistic charging/discharging.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Yingchao Li, Bashir S. Shariat, Hong Yang, Satyajit Sarkar, Junsong Zhang, Yunzhi Wang, Denis Favier, Yinong Liu
Summary: NiTi shape memory alloys exhibit Luders-type deformation due to stress-induced martensitic transformation. Various explanations have been proposed, but they contradict experimental evidence. In this study, a new model based on the conservation of sample length changes, crosshead movement, and elastic contraction is proposed and verified through experiments and measurements. The new model can describe the upper-lower yielding phenomenon and the plateau stress in Luders-type deformation behavior.
Article
Materials Science, Multidisciplinary
Zibing An, Shengcheng Mao, Yinong Liu, Luyan Yang, Ashok Vayyala, Xiao Wei, Cheng Liu, Caijuan Shi, Huixin Jin, Cuixiu Liu, Jianxin Zhang, Ze Zhang, Xiaodong Han
Summary: In this study, a strategy of using a heterogeneous grain size structure and a reduced stacking fault energy was explored in a CoCrFeNiMn FCC high entropy alloy to overcome the strength-ductility trade-off. The alloy achieved high yield strength, tensile strength, and elongation to failure through cooperative strain hardening mechanisms. These micromechanisms of deformation helped refine the mean free paths for dislocations and improve the alloy's hardness.
Article
Chemistry, Physical
Won-Tae Lee, Jong-Taek Yeom, Jung Gi Kim, Jeong Seok Oh, Taekyung Lee, Yinong Liu, Shuanglei Li, Tae-Hyun Nam
Summary: This study investigates the microstructure evolution and nanoindentation behavior of a Ti-20Zr-9Nb-4Sn alloy aged at 600 degrees C, demonstrating the potential for precipitation strengthening effect of (Zr,Sn)-rich precipitates. The results show that the hardness of the aged specimens initially increases and then reaches a plateau as aging time prolongs. The (Zr,Sn)-rich precipitates exhibit higher hardness than the alpha precipitate and matrix, indicating their contribution to the overall hardness of the specimen.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Yingchao Li, Junsong Zhang, Martin Saunders, Yang Ren, Hong Yang, Yinong Liu
Summary: By utilizing the principles of lattice strain matching and collective atomic load transfer, ultralarge elastic strains were induced in a brittle NiTi-Nb3Sn eutectic composite, where Nb3Sn lamellae achieved a remarkable elastic lattice strain of -2.4%. This study both tests the applicability of lattice strain matching in brittle materials and explores a novel fabrication approach for in-situ composites via eutectic solidification.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Bashir S. Shariat, Hong Yang, Yinong Liu
Summary: This study examines the formation and propagation process of Luders bands in parallel-graded NiTi samples during stress-induced martensitic transformation. Digital image correlation is used to measure the full-field strain. The samples with varying width profiles experience progressively increasing load and continuous variation of width during the transformation process. The size of the Luders band front transition zone remains constant, but the local strain rate varies. The transition zone of the forward transformation is wider and has a lower strain rate compared to the reverse transformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Yuru Zha, Daqiang Jiang, Yinong Liu, Genfa Kang, Hui Zhang, Xiaohua Jiang, Lishan Cui
Summary: By observing the Elinvar effect in non-magnetic Co-doped TiNi alloys, we added a small amount of Nb to Ti50Ni41Co9 alloy with low Co content to regulate the phase transformation behaviors and induce Elinvar effect. The effects of Nb content on the phase transformation behaviors and temperature dependences of elastic moduli were studied. Ti50Ni41Co9 alloy exhibited B2->R phase transformation during cooling, but it was suppressed by the increase of Nb content and converted to a continuous transformation over a broad temperature range.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Sam Bakhtiari, Arpit Agrawal, Hong Yang, Reza Mirzaeifar, Lishan Cui, Daqiang Jiang, Yinong Liu
Summary: The paper presents a unique phenomenon observed in a NiTi-Nb nanowire in-situ composite system, where the B2 NiTi matrix undergoes amorphization due to the diffusion of Nb through the B2 lattice. The diffusion of Nb in the NiTi matrix is driven by Oswald ripening, which occurs during the fragmentation and granulation of Nb nanowires at elevated temperatures. The amorphization of the NiTi matrix is attributed to the formation of anti-site defects caused by the substitutional diffusion of Nb.
Article
Materials Science, Multidisciplinary
Hengzhe Wang, Haibo Long, Yinong Liu, Yunsong Zhao, Xueqiao Li, Guo Yang, Xiaomeng Yang, Yanhui Chen, Shengcheng Mao, Ze Zhang, Xiaodong Han
Summary: This study investigates the effect of Ru on the solution heat treatment window of a Ni-based single crystal superalloy. The addition of Ru influences the solidification microstructure and widens the window. Ru decreases the partition ratios between the dendrite core and dendrite edge regions, promotes the enrichment of Re at the γ/γ' phase interfaces, inhibits the formation of (Ta, X)C carbide, and helps to widen the solution treatment temperature window of the alloy.
MATERIALS CHARACTERIZATION
(2023)
Article
Multidisciplinary Sciences
Yan Lu, Yongchao Chen, Yongpan Zeng, Yin Zhang, Deli Kong, Xueqiao Li, Ting Zhu, Xiaoyan Li, Shengcheng Mao, Ze Zhang, Lihua Wang, Xiaodong Han
Summary: Understanding the nanoscale fracture processes and mechanisms in BCC metals is important for preventing failure. In this study, in situ atomic-resolution observations reveal the crack growth process and the effects of temperature and strain rate on crack growth. The results provide insights into the dislocation-mediated mechanisms of the ductile to brittle transition in BCC refractory metals.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yingchao Li, Sam Bakhtiari, Hong Yang, Martin Saunders, Daqiang Jiang, Yinong Liu
Summary: This study investigated the effects of various point defects on the monoclinic angle of the B19 '' martensite in NiTi. It was found that different defects have different effects on the monoclinic angle, which in turn affects the characteristic strains of the alloy. These findings may provide insights into the variations of recoverable transformation strains of NiTi shape memory alloys observed experimentally.
SHAPE MEMORY AND SUPERELASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Bashir S. Shariat, Yinong Liu
Summary: This study investigated the variation of the Poisson's ratio of a NiTi alloy during pseudoelastic deformation. The results showed that the Poisson's ratio of the alloy changed at different stages.
SHAPE MEMORY AND SUPERELASTICITY
(2023)
Article
Nanoscience & Nanotechnology
Zibing An, Shengcheng Mao, Cheng Jiang, Ziyao Li, Shichang Wu, Yadi Zhai, Li Wang, Yinong Liu, Ze Zhang, Xiaodong Han
Summary: A high-entropy alloy (HEA) with low stacking fault energy and high strength was designed using the principle of heterostructure strengthening. The alloy exhibited a multi-scale heterogeneous microstructure containing hierarchical twins. It achieved ultrahigh yield strength, ultimate tensile strength, and large ductility at low temperature, surpassing most FCC HEAs reported so far and breaking the strength-ductility trade-off of conventional metal alloys. The extraordinary mechanical properties were attributed to a suitable strain hardening capability resulting from the synergistic effect of hetero-deformation-induced hardening, twinning-induced plasticity, and deformation-induced phase transformation.
SCRIPTA MATERIALIA
(2024)
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)
