Article
Chemistry, Multidisciplinary
Wen Wan, Darshana Wickramaratne, Paul Dreher, Rishav Harsh, Igor I. Mazin, Miguel M. Ugeda
Summary: This study investigates the evolution of the electronic ground state of a monolayer of Nb1-delta Mo delta Se2 across the entire alloy composition range. It is found that Mo doping decreases the density of states at the Fermi level and the magnitude of pair-breaking spin fluctuations. These results have significant implications for future 2D materials design.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Zhenlin Zhang, Yue Zhao, Jiguo Shan, Aiping Wu, Yutaka S. Sato, Shun Tokita, Kota Kadoi, Hiroshige Inoue, Huaipeng Gu, Xin Tang
Summary: Laser cladding was used to repair non-weldable as-cast K447A nickel-based superalloy, and the study focused on the metallurgical evolution of liquid film and liquation cracking mechanisms. The results showed the presence of an uncommon Ni21Hf8 phase in the incipient melting regions, and the cracking criterion of the liquid film was established based on pressure drop.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Kaoru Imaizumi, Asaya Fujita, Asuka Suzuki, Makoto Kobashi, Kimihiro Ozaki
Summary: A highly homogeneous single-phase La(FexSi1-x)(13) compound was successfully obtained by the laser fusion of Fe and La-Si compounds. Rapid homogenization was achieved even at high Fe concentration due to the formation of a unique microstructure during laser fusion. The selective oxidation of La was prevented by reducing oxides on the surface of Fe particles. The heat-treated specimens exhibited a maximum magnetic entropy change (ΔS-M) of -22 J/kg K for the 24-hour treatment and -18 J/kg K for the 2-hour treatment. The laser fusion process significantly reduced the heat-treatment duration for the formation of a highly homogenized La(FexSi1-x)(13) compound. This study suggests that the laser fusion process followed by post-annealing can selectively form fine structures made of the 1:13 phase, enabling precise modeling of regenerator-beds in 3D.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Condensed Matter
A. Kolli, N. Guechi, M. Kharoubi, A. Kharmouche
Summary: In this study, the structural, elastic, electronic phase transitions, and magnetic properties of FeCrScSi and FeCrScGe alloys under pressure were investigated using the pseudo-potential plane wave method. The results showed that these alloys undergo an electronic phase transition from spin filter material to spin gapless semiconductor under certain pressures, while exhibiting a half-metallic nature.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Chemistry, Physical
Sunday Arome Agbo, Subhash Bhatt, Mahmud Khan
Summary: The Ni2Mn0.70Cu0.30Ga Heusler alloy undergoes phase transitions and magnetic entropy changes, with coupled first order magnetostructural martensitic transitions. Different peak magnetic entropy changes are observed during heating and cooling, indicating the controllability of magnetocaloric properties by manipulating phase transition overlaps.
Article
Chemistry, Physical
Feng Gu, Shu Wang, Chen Zhang, Xue Yu, Ji-Bing Sun, Ying Zhang, Chun-Xiang Cui
Summary: The addition of low melting point Ga alters the crystallization process and microstructure of Nd13.65Fe74.15B5.6Co6.6 ribbons, resulting in improved glass-forming ability and enhanced magnetic properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Xiang Chi, Ziqiang Chen, Shu Wang, Tengyu Guo, Jinzhi Li, Jibing Sun, Ying Zhang
Summary: This paper investigates the relationship between microstructure and magnetic properties of a new Sm3Co11B4-type alloy with ultra-high coercivity. The addition of a small amount of Fe changes the microstructure from equiaxed to strip-like morphology, leading to a higher coercivity and magnetization. However, with further increase in Fe content, a new phase is formed, causing the microstructure to change from strip-shaped to equiaxed and reducing the coercivity. The underlying mechanism is revealed through the microstructure evolution in connection with magnetic properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Crystallography
Hamdi Jaballah, Kamel Nouri, Najeh Mliki, Lotfi Bessais, Mosbah Jemmali
Summary: In this study, the crystal structure, magnetic properties, and magnetocaloric effect of SmNi3-xFex intermetallic compounds were investigated. The experimental and theoretical results showed consistency and revealed the effects of element substitution on the crystal structure and magnetic properties.
Article
Physics, Condensed Matter
Dan Hong, Wei Zeng, Fu-Sheng Liu, Zheng-Tang Liu, Qi-Jun Liu
Summary: In this study, the structures, phase transitions, mechanical properties, dynamic stability, and electronic properties of SnO polymorphs under pressure were investigated using first-principles calculations. The calculated results were consistent with available data. The phase transitions from alpha to gamma at 0.94 GPa and from B1 to B2 at 49.1 GPa were confirmed based on the enthalpy-pressure curves. The studied polymorphs exhibited different stability regions and elastic properties under pressure. The interactions between Sn and O elements were enhanced with increasing pressure, as evidenced by the density of states and charge density analysis.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Chemistry, Physical
C. Atthapak, A. Ektarawong, T. Pakornchote, B. Alling, T. Bovornratanaraks
Summary: This study investigates the effect of transition metal atom configuration and spin-orbit coupling on the thermodynamic stability and electronic bandgap of monolayer 2H-Mo1-xWxS2 through theoretical calculations and formal methods. The research shows that despite a weak ordering tendency of Mo and W atoms, monolayer 2H-Mo1-xWxS2 is thermodynamically stable as a single-phase random solid solution above 45K. Spin-orbit coupling, mainly induced by W atoms, has minimal impact on the mixing thermodynamics of Mo and W atoms, but significantly affects the electronic bandgap of the monolayer solid solution.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Viviana Dovale-Farelo, Pedram Tavadze, Matthieu J. Verstraete, Alejandro Bautista-Hernandez, Aldo H. Romero
Summary: In this study, first-principles calculations were used to investigate the properties of Cr1-xMoxB2 alloys, with Cr0.5Mo0.5B2 showing excellent mechanical properties at x=0.50. Chemical bonding analysis further confirmed the relationship between the strength of the new compounds and their structure and chemical bonds.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Rui Zhou, Juanxia Wu, Yuansha Chen, Liming Xie
Summary: This review summarizes recent advances in 2D MoTe2, WTe2 and their alloys, including their polymorph structures, preparation methods, physical properties, and potential device applications.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
S. Kuzovchikov, I. Bajenova, A. Khvan, V. Cheverikin
Summary: Phase transformations of the Cr-Co-Mn system were investigated using DTA, XRD, SEM, and EPMA. Liquidus and solidus projections, a melting diagram, and Scheil reaction scheme were established. The enthalpy of formation of equimolar & sigma; phase was determined by drop-solution calorimetry. The composition dependency of microhardness for single-phase & sigma; alloys was obtained.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Dalibor Preisler, Michaela Janovska, Hanus Seiner, Lucie Bodnarova, Jitka Nejezchlebova, Martin Koller, Petr Sedlak, Petr Harcuba, Jozef Vesely, Jiri Kozlik, Tomas Chraska, Josef Strasky, Milos Janecek
Summary: Compositionally graded samples of Ti-xNb-7Zr-yO alloys with various chemical compositions were prepared and studied for potential biomedical use. The elastic constants of each sample were determined, showing a dependence on the volume fraction of niobium and oxygen. The lowest elastic modulus was observed near the stability limit between β matrix and α'' martensitic phase, while the presence of isothermal ω particles led to the highest elastic constants.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Multidisciplinary
A. Stupakiewicz, C. S. Davies, K. Szerenos, D. Afanasiev, K. S. Rabinovich, A. V. Boris, A. Caviglia, A. V. Kimel, A. Kirilyuk
Summary: Researchers have achieved switching of magnetization in magnetic garnet films by ultrafast resonant excitation of longitudinal optical phonon modes, revealing the magneto-elastic mechanism of the switching. In contrast, excitation of strongly absorbing transverse phonon modes results in a thermal demagnetization effect only.
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)