Article
Chemistry, Physical
Alberto A. Mendonca, Luis Ghivelder, Pablo L. Bernardo, Lesley F. Cohen, Angelo M. Gomes
Summary: In this study, a Cr-doped Ni2.15Mn0.70Cr0.15Ga alloy was investigated, which demonstrated a magnetostructural transition, thermal hysteresis, magnetocaloric effect, and ferromagnetic shape memory effect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Subrata Ghosh, Saheli Samanta, Jayee Sinha, Kalyan Mandal
Summary: This study investigates the magnetocaloric properties of a (FeCoGa)(x) doped (MnNiSi)(1-)(x) compound with x = 0.165, demonstrating a magnetostructural transition at 265 K and a large isothermal magnetic entropy change of about -29.3 J kg(-1)K(-1) due to a 5 T magnetic field change. This material shows promising potential for magnetic refrigeration.
APPLIED PHYSICS LETTERS
(2021)
Article
Metallurgy & Metallurgical Engineering
A. G. Gamzatov, Sh K. Khizriev, A. M. Aliev
Summary: The magnetization and magnetocaloric effect (MCE) of a fast-hardened ribbon Ni50Mn35Al2Sn13 sample have been studied. The inverse effect value was found to depend on the temperature scanning rate, with higher scanning rates resulting in larger MCE values due to the relaxation effect and irreversibility of the phase transition. The inverse effect value was -0.39 K in an 18 kOe magnetic field, while the direct effect value was 0.2 K. The observed magnetization increase in a weak magnetic field was attributed to the Hopkinson effect and the coexistence of two crystalline phases.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Chemistry, Physical
A. F. Manchon-Gordon, J. J. Ipus, M. Kowalczyk, J. S. Blazquez, C. F. Conde, P. Svec, T. Kulik, A. Conde
Summary: The influence of fabrication method on the magnetostructural properties of Ni55Fe19Ga26 Heusler alloy was analyzed, showing differences in martensitic structure and transformation temperature between ribbon and bulk samples. The different grain sizes led to varied phase transformation behaviors, with martensitic transformation occurring mainly in the paramagnetic regime.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Hongchang Wang, Pengqiang Hu, Zhengming Zhang, Dunhui Wang
Summary: Magnetostructural coupling materials have excellent magnetocaloric properties and are ideal candidates for magnetic refrigerants. By adding Co into the Ge site of Tb5Si2Ge2, a strong magnetostructural coupling can be achieved, significantly improving the magnetocaloric properties of the compound. Experimental results show that the magnetic entropy change and temperature-averaged entropy change are increased after Co doping, indicating an enhanced low-field magnetocaloric performance. Theoretical calculations also confirm a large lattice entropy change after the magnetostructural transformation. These findings demonstrate that Co doping can transform Tb5Si2Ge2 into an excellent magnetic refrigerant.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Aun N. Khan, Luis M. Moreno-Ramirez, Alvaro Diaz-Garcia, Jia Yan Law, Victorino Franco
Summary: All-d-metal Ni(Co)-Mn-Ti Heusler alloys exhibit high magnetocaloric/barocaloric effects due to the occurrence of a martensitic transformation and excellent mechanical properties. By partially substituting Mn with Fe or Cr, the martensitic transition and magnetocaloric response can be further regulated. Cr doping increases the entropy change but reduces the magnetization difference, while Fe doping reduces the entropy change but maintains the magnetization difference. The Fe-doped alloy requires lower magnetic fields to initiate the transformation and shows higher and broader isothermal entropy change peaks.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Aquil Ahmad, Srimanta Mitra, S. K. Srivastava, A. K. Das
Summary: A giant magnetocaloric effect was observed in Co2FeAl Heusler alloy nanoparticles near the ferromagnetic to paramagnetic phase transition, with a positive anomaly in magnetic entropy change and a linear increase with magnetic field. The nature of the phase transition was confirmed to be second-order based on the Arrott plot and universal curve analysis.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Sheuly Ghosh, Subhradip Ghosh
Summary: This paper presents a systematic screening approach for compounds in the Heusler family using density functional theory and a thermodynamic model, predicting four new compounds with potential for giant magnetocaloric effects. The study shows that cosubstitution can significantly improve thermodynamic parameters relevant for magnetocaloric applications compared to traditional substitution methods.
Article
Chemistry, Physical
R. Archana, S. Kavita, V. V. Ramakrishna, V. Suresh Kumar, Pramod Bhatt, S. M. Yusuf, R. Gopalan
Summary: Ni 43Mn 46Sn11-xTex(x = 0.1, 0.2, 0.3, 0.4, 0.5, 1) alloys were prepared by arc melting. Structural studies revealed the presence of L21 cubic austenite phase. The martensite phase and lattice constant decrease with increasing Te concentration. All alloys exhibit first-order phase transition. The martensite temperature increases successively with increasing Te concentration. A non-linear magnetic entropy change and thermal hysteresis were observed with increasing Te concentration. The magnetocaloric effect was observed over a broad temperature range by varying the Te concentration. The tunable martensite temperature and magnetocaloric properties with Te concentration make these alloys useful for magnetic refrigeration applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jing-Han Chen, Tej Poudel Chhetri, Anthony T. Grant, Chung-Kai Chang, David P. Young, Igor Dubenko, Naushad Ali, Shane Stadler
Summary: The magnetic, structural, and thermal behaviors of Cu-doped Heusler alloy Ni2Mn1-xCuxGa (0 <= x <= 0.4) were investigated as a function of Cu concentration. Increasing Cu concentration led to higher structural transition temperatures, while chemical order-disorder transition temperatures and melting points decreased. The study constructed a comprehensive phase diagram of magnetic and structural properties as a function of Cu concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Atakan Tekgul
Summary: The Ni-54(FeMn)(19)Ga-27 Heusler alloy exhibits a mixed-phase structure with ferromagnetic to paramagnetic phase transition at room temperature and a high Curie temperature. The alloy has a saturation magnetization of 53.97 Am(2)kg(-1) under 2 T magnetic field and shows a second-order phase transition with a magnetic entropy change of about 1.5 J kg(-1)K(-1) under the same magnetic field.
Article
Materials Science, Multidisciplinary
Hui Zeng, Chao Jing, Yuanlei Zhang, Ningbo Qin, Zhe Li, Tarek Bachagha, Haodong Sun
Summary: The addition of bi doping in Ni-Mn based Heusler alloys was found to significantly impact the magnetic properties, leading to changes in magnetocaloric effect and exchange bias properties. The study demonstrated improved magnetic entropy change and exchange bias field after Bi doping, providing potential for selecting more cost-effective magnetocaloric materials.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
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
Materials Science, Multidisciplinary
M. J. Winiarski, G. Kuderowicz, K. Gornicka, L. S. Litzbarski, K. Stolecka, B. Wiendlocha, R. J. Cava, T. Klimczuk
Summary: We report the synthesis and physical properties of a full Heusler compound, MgPd2Sb, which exhibits superconductivity below Tc = 2.2K. The compound was found to be a type-II, weak coupling superconductor, with a strong pressure dependence of Tc (-0.23K/GPa). Theoretical investigations on electronic structure and electron-phonon coupling confirmed the superconducting mechanism.
Article
Chemistry, Physical
Xiao-Ming Huang, Ying Zhao, Hai-Le Yan, Nan Jia, Bo Yang, Zongbin Li, Yudong Zhang, Claude Esling, Xiang Zhao, Liang Zuo
Summary: Ni-Mn-Z (Z = In, Sn, and, Sb) metamagnetic shape memory alloys exhibit state-of-the-art magnetoresponsive effects due to magnetic-field-induced reversible martensitic transformation. By substituting Cu for In in Ni45Co5Mn36In14 alloy, a second-phase freed Ni45Co5Mn36In13.2Cu0.8 alloy is obtained with improved magnetoresponsive effects. The directionally solidified sample shows excellent magnetoresistance and magnetic-field-induced strain, with a significant magnetic entropy change and adiabatic temperature change, indicating promising low-field magnetocaloric response.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Anitha Anand, M. Manjuladevi, R. K. Veena, V. S. Veena, Yuri S. Koshkid'ko, S. Sagar
Summary: The study investigated the effects of Ti-doping on the structural, magnetic, and magnetocaloric properties of Ti-doped Sm-Sr based manganites. The results showed a decrease in magnetic properties with increasing Ti content, but an increase in working temperature span and a reduction in heat loss associated with magnetic hysteresis.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
F. Caballero Briones, J. Guerrero-Contreras, S. E. Benito-Santiago, J. L. Sanchez Llamazares, F. J. Espinosa-Faller
Summary: This study observed the formation of nanoscrolls after hydrazine treatment in iron oxide-decorated graphene oxide, leading to the formation of nanoribbons after HCl treatment. The proposed mechanism includes the decoration onto the epoxy/hydroxyl moieties and the reduction of carboxyl and carbonyl groups causing the sheet rolling, with nanoribbons forming upon iron oxide dissolution and breaking of iron-carbon bonds. The superparamagnetic materials exhibited maximum saturation magnetization of 30 and 20 A.m(2).kg(-1), respectively, and the formation of these structures in FeOx-GO appears to be a more general phenomenon not described in other reports.
Article
Multidisciplinary Sciences
Jacek Cwik, Yurii Koshkidko, Konstantin Nenkov, Evgenia Tereshina-Chitrova, Malgorzata Malecka, Bruno Weise, Karolina Kowalska
Summary: This study examines the magnetocaloric efficiency of rare-earth Laves-phase compounds using Ho1-xErxNi2 as an example and illustrates their potential as components of magnetocaloric composites. The determined regularities in the system's behavior substantiate the possibility of achieving high magnetocaloric potentials in a desired temperature range.
SCIENTIFIC REPORTS
(2022)
Article
Crystallography
Jacek Cwik, Yurii Koshkid'ko, Konstantin Nenkov, Evgenia Tereshina-Chitrova, Bruno Weise, Karolina Kowalska
Summary: The paper presents heat capacity measurements on polycrystalline Tb1-xErxNi2 intermetallic compounds. It was found that the Curie temperatures decrease linearly with the substitution of Tb atoms for Er atoms. The calculated isothermal magnetic entropy and adiabatic temperature changes provide valuable insights into the properties of the compounds.
Article
Materials Science, Multidisciplinary
Fan Li, Dewei Zhao, Jian Liu, Alexander Kamantsev, Elvina Dilmieva, Yury Koshkid'ko, Chunhui Zhu, Li Ma, Congmian Zhen, Denglu Hou
Summary: This study investigates the entropy change and magnetocaloric properties in a Ni50Mn18.5Ga25Cu6.5 Heusler alloy. The structural and magnetic components synergistically contribute to the total entropy change during the magnetostructural transformation. The alloy exhibits a large phase transformation entropy change, with the structural component accounting for the majority. Additionally, the adiabatic temperature change of the alloy under a magnetic field is significant.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Nanoscience & Nanotechnology
M. L. Arreguin-Hernandez, M. Varga, M. Hennel, A. Dzubinska, T. Ryba, M. Reiffers, P. Diko, J. L. Sanchez Llamazares, R. Varga
Summary: We present the structural, magnetic, and magnetocaloric properties of glass-coated Ni(42.9)Mn(37.1)Sn(20.0) microwires fabricated by the Taylor-Ulitovsky technique. The microwire samples exhibit a single-phase austenite structure with a Curie temperature of 349 K. Notably, the microwires achieve saturation magnetization at a very low magnetic field (approximately 0.15 T). For a magnetic field change of 3 T, the microwires demonstrate a reversible maximum magnetic entropy change |delta S-M|(max) of 2.3 J kg(-1) K-1 and a refrigeration capacity of 197 J kg(-1), similar to those reported for other austenitic NiMnSn alloys produced by rapid quenching techniques.
Article
Crystallography
Galina Politova, Irina Tereshina, Ioulia Ovchenkova, Abdu-Rahman Aleroev, Yurii Koshkid'ko, Jacek Cwik, Henryk Drulis
Summary: In this study, the magnetocaloric effect in the TbCo2-H system near the Curie temperature was investigated using direct and indirect methods. The magnetic and magnetothermal properties of TbCo2-H with high hydrogen content were examined, and the mechanisms responsible for the change in the Curie temperature were established. The field and temperature dependences of the magnetocaloric effect were analyzed, and the magnetocaloric properties of various systems based on TbCo2 compound were compared. The regularities of the change in the MCE value and the Curie temperature depending on the composition were discovered and discussed.
Article
Nanoscience & Nanotechnology
M. L. Arreguin-Hernandez, A. Dzubinska, M. Reiffers, J. L. Sanchez Llamazares, C. F. Sanchez-Valdes, R. Varga
Summary: Melt-spun ribbon samples of the multicomponent alloy Mn0.5Fe0.5NiSi0.940Al0.060 were used to investigate the magnetostructural transition and magnetocaloric properties. The samples undergo a first-order transition from a paramagnetic Ni2In-type hexagonal structure to a ferromagnetic TiNiSi-type orthorhombic structure. The ribbons exhibit broader ΔS-T(T) curves with moderate maximum values at 2 T, and lower magnetic hysteresis loss compared to bulk alloys. This study highlights the effectiveness of the rapid solidification technique in producing homogeneous ribbon samples of multicomponent alloys.
Article
Materials Science, Multidisciplinary
F. Chen, J. L. Sanchez Llamazares, C. F. Sanchez-Valdes, P. Mullner, Y. X. Tong, L. Li
Summary: In this study, Ni38Co12Mn41Sn9 melt-spun ribbons were annealed under different conditions to obtain samples without secondary phase precipitates or with various average grain sizes. A comparative study was conducted to investigate the effect of secondary phase formation on the martensitic transformation and magnetocaloric properties. The presence of secondary phase significantly reduces the structural transformation temperatures and decreases the maximum entropy change, with a more pronounced effect for smaller secondary phase precipitates. Ribbons with smaller secondary phase grains exhibit lower maximum entropy change but smaller magnetic hysteresis loss compared to those with coarse secondary phase grains.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Applied
Rafael G. Suarez, Aida Miranda, J. L. Sanchez-Llamazares, I. Betancourt
Summary: MnCoSi and MnCoSiB0.5 alloys with polycrystalline microstructures were obtained using the melt-spinning technique. These alloys exhibited single-phase materials with orthorhombic structure and TiNiSi-type crystal symmetry, as determined by X-ray analysis. The alloys also showed soft magnetic behavior with coercivity values lower than 20 Oe and saturation magnetization of 80 emu/g. The MnCoSiB alloys had a maximum magnetic entropy change of 1.0 J/kg K and attractive refrigerant capacity over 100 J/kg, representing a significant improvement compared to equivalent MnCoGe alloys.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2023)
Article
Materials Science, Multidisciplinary
Hao Liu, Jiyu Fan, Dayuan Hu, J. L. Sanchez Llamazares, Pedro Gorria, Chunlan Ma, Yan Zhu, Hao Yang
Summary: In this article, the critical behavior of the cubic Laves crystalline binary intermetallic compound ErNi2 near its second-order ferromagnetic to paramagnetic transition is analyzed. The second-order nature of the transition is confirmed by the normalized thermal dependencies of the magnetic entropy change curves and the Banerjee criterion. By comparing the normalized slopes, the Tricritical mean-field model is found to be the best model to calculate the critical exponent value of ErNi2. Using the modified Arrott plots, the final critical exponents are determined to be beta = 0.164(2) and gamma = 0.821(9), which closely match the Tricritical mean-field model with some slight differences. The accuracy and reliability of these exponents are further confirmed by the Widom scaling relation and the scaling hypothesis.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Energy & Fuels
Tapas Samanta, Chris Taake, Laila Bondzio, Luana Caron
Summary: The nature of phase transition and the reversibility of the magnetocaloric effect have been studied in MnNi1-xCoxGe0.97Al0.03. The introduction of Al substitution lowers the structural phase transition temperature, resulting in a coupled first-order magnetostructural transition. A composition-dependent triple point has been observed in the system, where the first-order phase transition splits into an additional phase boundary with a second-order transition character at higher temperature. The reversibility of the low-field entropy change is enhanced at the triple point due to lattice softening and larger field-induced structural entropy change.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Chemistry, Multidisciplinary
T. A. Tran, Dimitar N. Petrov, T. L. Phan, B. D. Tu, H. N. Nhat, H. C. Tran, B. Weise, J. Cwik, Yu S. Koshkid'ko, T. V. Manh, T. P. Hoang, N. T. Dang
Summary: We conducted a detailed study on the magnetic behaviors and magnetothermal effects of a single crystal of lithium samarium tetraphosphate, LiSm(PO3)(4). The temperature-dependent magnetization data analysis revealed the establishment of magnetic ordering below T-p, where T-p is the minimum of the dM/dT vs. T curve and varies linearly with the applied field H. The crystal exhibits paramagnetic behavior above T-p, and a coexistence of antiferromagnetic and ferromagnetic interactions is observed due to the couplings of magnetic dipoles and octupoles at the Gamma(7) and Gamma(8) states. Evaluation of the magnetocaloric effect showed an increase in the value of the absolute magnetic-entropy change and adiabatic-temperature change at lower temperatures and higher magnetic field magnitudes.
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)
