Article
Chemistry, Multidisciplinary
Jesus Carlos Guzman-Minguez, Cecilia Granados-Miralles, Patrick Kuntschke, Cesar de Julian Fernandez, Sergey Erokhin, Dmitry Berkov, Thomas Schliesch, Jose Francisco Fernandez, Adrian Quesada
Summary: This study aims to explore the magnetic properties of hard-soft composite permanent magnets and their correlation with microstructure. The experimental results show that increasing the particle size of the soft phase can enhance the remanence in injection molded magnets. Through experimental analysis and simulations, it is revealed that the interaction between the hard and soft phases is of a dipolar nature.
Article
Materials Science, Ceramics
Gang Fang, Chuyang Liu, Yun Yang, Kangsen Peng, Guoyue Xu, Yujing Zhang
Summary: By synthesizing hard/soft magnetic composites Ba(Zr-Ni)(0.6)Fe10.8O19/Fe3O4, this study successfully achieved a broad microwave absorption bandwidth. Increasing the heat treatment temperature led to more Fe3O4 particles attaching to Ba(Zr-Ni)(0.6)Fe10.8O19 particles, enhancing the exchange coupling effect and ultimately widening the magnetic loss range, resulting in a superior performance compared to most state-of-the-art microwave absorbers.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
A. Alipour, Sh Torkian, A. Ghasemi, M. Tavoosi, G. R. Gordani
Summary: This study prepared and investigated an exchange spring magnet with a new composition, demonstrating efficient exchange coupling behavior in SrFe12O19/Co nanocomposites with different hard/soft magnetic phase ratios. The non-aqueous polyol method was used for size control and impurity avoidance, confirmed by X-ray diffraction and SEM analysis. Vibrating sample magnetometer analysis revealed that the nanocomposite with 15% mass ratio of soft phase exhibited the highest exchange coupling interactions.
CERAMICS INTERNATIONAL
(2021)
Article
Energy & Fuels
Ameerah N. Alqarni, E. Cevik, M. A. Gondal, M. A. Almessiere, A. Baykal, A. Bozkurt, Y. Slimani, M. Hassan, A. Iqbal, Sarah A. Alotaibi
Summary: This study demonstrates a device utilizing vanadium-doped cobalt-nickel spinel ferrite nanoparticles to address the low energy density and stability problems in supercapacitors at high currents. The device shows successful energy density retention, high power density, and cyclic stability.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Materials Science, Ceramics
Shuang Zhang, Chunxiang Cao, Shubing Su, Ailin Xia, Huiyan Zhang, Hailing Li, Zhiyuan Liu, Chuangui Jin
Summary: Anisotropic exchange coupling interaction was observed in sintered oblate cylindrical SrFe12O19 specimens synthesized via a hydrothermal method. The exchange coupling interaction occurred between hard-hard magnetic grains in both as-pressed and sintered samples. However, this interaction was only found in the in-plane direction and not in the out-of-plane direction for the sintered specimens. The anisotropy was attributed to the vertically arranged plate-like SrM grains with micrometer width and nanometer thickness, as confirmed by cross-sectional morphologies of fractured specimens.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Chemistry, Physical
Xueying Wang, Huaiwu Zhang, Liang Shi, Jie Li, Lichuan Jin, Liu Cheng, Lijun Jia, Rui Peng, Dainan Zhang
Summary: By adding Bi3+ ions into BaM materials, the sintering temperature can be reduced and the magnetic properties can be controlled, resulting in a pure phase with dense microstructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Y. B. Guo, X. Li, W. H. Xie, C. Yang, C. L. Jia, L. Ma, Z. J. Zhao
Summary: This paper investigates the influence of exchange coupling and dipolar interaction on magnetization processes by studying the system of FePt/FePd film deposited on FINEMET ribbon. The results show that the exchange coupling and dipolar interaction enhance the Giant Magnetoimpedance effect (GMI) and result in asymmetric characteristics of GMI curves. Through Magneto-optical Kerr effect microscopy, different magnetic domain structures are observed in FINEMET ribbon and FePd film. The study reveals the important role of exchange coupling and dipolar interaction in the generation of the bias field (Hb).
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Pierfrancesco Maltoni, Tapati Sarkar, Gianni Barucca, Gaspare Varvaro, Federico Locardi, Davide Peddis, Roland Mathieu
Summary: Magnetic nanocomposites based on ferrite were synthesized using a sol-gel approach, showing potential for exchange-coupled bimagnetic behavior. By studying the distribution of hard/soft particles, interface optimization, and magnetic response through XRPD, TEM, and magnetic measurements, the study established the potential of hard/soft SFO/CFO nanostructures in current permanent magnet technology.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Pierfrancesco Maltoni, Gianni Barucca, Bogdan Rutkowski, Maria Chiara Spadaro, Petra E. Jonsson, Gaspare Varvaro, Nader Yaacoub, Jose A. De Toro, Davide Peddis, Roland Mathieu
Summary: The magnetic coupling of SrFe12O19/CoFe2O4 nanocomposites is investigated. The structural coherence and texture at the interfaces of the nanostructures are evidenced by advanced electron microscopy. The exchange intergranular interaction is evidenced and the critical thickness for uniform reversal of coupled interfaces is quantified.
Article
Materials Science, Multidisciplinary
Amritpal Singh, Samuel Schwarm, Michael Carton, Anusha Natarajarathinam, P. B. Visscher, Subhadra Gupta
Summary: Experimental investigation showed that increasing the thickness of V and Zr insertions enhances perpendicular magnetic anisotropy. V insertion provides thermal stability comparable to previously reported Ta insertion. The effect of the Gilbert damping constant on switching characteristics is most significant for thinner insertions, diminishing as insertion thickness increases.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Energy & Fuels
Munirah Abdullah Almessiere, Yassine Abdelhamid Slimani, Mohammed Hassan, Mohammed Ashraf Gondal, Emre Cevik, Abdulhadi Baykal
Summary: The synthesized CFO-xNFSO nanocrystals exhibit good potential in energy storage applications, showing enhanced capacitance and relatively high energy density in supercapacitor electrodes. The cubic spinel ferrite phase of the NCs is verified by XRD, SEM, and HR-TEM techniques. The magnetic properties of the NCs with different x ratios suggest a good exchange-coupling in the CFO-xNFSO magnetic nanocrystals.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Physics, Applied
Guohua Wu, Zhong Yu, Rongdi Guo, Zhiguang Wang, Hong Wang, Zhongqiang Hu, Ming Liu
Summary: To achieve compact and lightweight power conversion devices, MnZn ferrite doped with high-valent Sn4+ ions is used to manipulate electromagnetic properties and suppress high-frequency core losses. The Sn4+ ions mainly occupy grain boundaries rather than dissolving into the lattice, significantly impacting the electromagnetic properties. With increasing Sn substitution, initial permeability and saturation induction decrease monotonically. A Sn substitution content of 0.003 reduces core losses to 457 kW m(-3) at 3 MHz, 30 mT, and 25 degrees C, effectively suppressing eddy current loss and residual loss. The sample with Sn content of 0.003 demonstrates excellent overall electromagnetic properties, making it potentially useful in high-frequency transformers, converters, and power sources.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
M. A. Almessiere, B. Unal, I. A. Auwal, Y. Slimani, H. Aydin, A. Manikandan, A. Baykal
Summary: In this study, SrGaFeO-ZnNiFeO hard/soft nanocomposites were synthesized at different calcination temperatures and their electrical and dielectric properties were systematically investigated. The AC conductivity was found to be largely dependent on the calcination temperatures, and impedance analysis revealed that the conduction mechanisms were mainly attributed to grain-grain boundaries. Additionally, the dielectric constant showed frequency-dependent behavior influenced by the calcination temperatures.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
M. A. Almessiere, Y. Slimani, H. Attia, S. I. M. Sheikh, Ali Sadaqat, M. G. Vakhitov, D. S. Klygach, M. Sertkol, A. Baykal, A. V. Trukhanov
Summary: The study investigated the magnetization properties and exchange coupling of hard/soft nanocomposites by varying the ratios of different elements. The sample with the highest Zn content and the same Ni and Cu contents achieved higher saturation magnetization values at 10 K and 300 K. The waveguide approach was employed to study the electrodynamic properties of the samples.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Ceramics
K. Khan, Hur Abbas, K. Nadeem
Summary: Soft/hard nanocomposites (NCs) with different hard ferrite ratios (x = 0, 25, 50, 75, and 100) were synthesized using in-situ auto-combustion sol-gel method. The XRD patterns confirmed the presence of hexaferrite and spinel ferrite phases without impurities. FTIR and Raman spectra confirmed the fabrication of desired material without impurities. The M-H loops showed strong interphase exchange-coupling among hard-soft ferrite phases, and the impedance analysis indicated the potential use of these NCs in various technological applications.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Applied
Essia Hannachi, Yassine Slimani, Muhammad Nawaz, R. Sivakumar, Zayneb Trabelsi, R. Vignesh, Sultan Akhtar, Munirah A. Almessiere, Abdulhadi Baykal, Ghulam Yasin
Summary: Yttrium (Y) and cerium (Ce) co-doped ZnO nanoparticles were synthesized using a sol-gel auto-combustion method. The doping of Ce and Y affected the crystal structure and size of the ZnO nanoparticles. The optical properties, zeta potential, and photocatalytic activities were significantly altered by the co-doping. Undoped ZnO showed better stability and higher photocatalytic activity for methyl orange degradation compared to Ce-Y doped ZnO nanoparticles.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Multidisciplinary
M. A. Almessiere, S. Guener, Y. Slimani, A. Demir Korkmaz, A. Baykal
Summary: Sr0.8Ni0.2Fe12-2xMoxO19 (x <= 0.35) nanohexaferrites were synthesized using a sol-gel combustion method and their properties were characterized. The Mo-doped samples exhibited soft magnetic behavior, while the undoped samples showed hard magnetic behavior.
Article
Materials Science, Ceramics
Munirah A. Almessiere, Yassine Slimani, Norah A. Algarou, Maksim G. Vakhitov, Ayse Demir Korkmaz, Abdulhadi Baykal, Denis S. Klygach, Tatiana I. Zubar, Anwar Ul-Hamid, Sergei V. Trukhanov, Alex V. Trukhanov
Summary: SrInxFe12-xO4/Ni0.5Zn0.5Fe2O4 (0.00 <= x <= 0.04) nanocomposites (SIFO/NZFO NCs) were synthesized using a one-pot sol-gel auto-combustion technique. The impact of indium doping on the magnetic properties of the nano-composites was investigated, and it was found that the saturation magnetization, remanence magnetization, and coercive field showed a non-monotonic dependence on the indium content.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Abba Bala Musa, Mohammad Tabish, Anuj Kumar, Manickam Selvaraj, Muhammad Abubaker Khan, Badria M. Al-Shehri, Muhammad Arif, Muhammad Asim Mushtaq, Shumaila Ibraheem, Yassine Slimani, Saira Ajmal, Tuan Anh Nguyen, Ghulam Yasin
Summary: Developing cost-effective and high-performance non-precious electrocatalysts for ORR is crucial for clean energy generation. Single-atom catalysts have shown significantly improved performance, but protecting their structure from deterioration is still a challenge. In this study, a simple strategy for protecting the structure of single-atom catalysts by implanting/decorating FeN4 on Fe-ZIF-derived carbon nanotubes is reported. The developed catalyst exhibits outstanding ORR activity in both acidic and alkaline media compared to commercial Pt/C.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
M. Sertkol, Y. Slimani, M. A. Almessiere, A. Baykal, S. Akhtar, E. G. Polat, S. Caliskan
Summary: Mn0.5Zn0.5DyxEuxFe2-2xO4 (x <= 0.1) nanospinel ferrites were synthesized using ultrasonication. The samples exhibited cubic spinel phase without impurities and nanostructure confirmed by XRD, TEM, and SEM. DR spectra revealed energy band gaps between 2.44 and 2.56 eV. The magnetic properties of DyEu -> MnZn (x <= 0.1) NSFs were influenced by Eu3+-Dy3+ ion inclusion, showing superparamagnetic and ferromagnetic behavior.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
E. Hannachi, M. I. Sayyed, Y. Slimani, M. A. Almessiere, A. Baykal, M. Elsafi
Summary: This study synthesized novel BTO/MnZnFeO ceramic composites via cost-effective and environmentally friendly approaches, and evaluated their crystal structure and shielding performance against gamma radiation. The X-ray diffraction results showed no chemical reaction within the MnZnFeO and BTO phases in the bi-phasic ceramic composites. The size of the crystallite decreased with increased MnZnFeO content. The experiments demonstrated the improved attenuation parameters of the BTO/MnZnFeO ceramic composites, including linear attenuation coefficients, half-value layer, average tenth value layer, and radiation absorption ratio. These composites performed well in shielding gamma radiation with photon energy lower than 100 keV.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
B. Unal, M. A. Almessiere, A. Baykal, Y. Slimani, A. Sadaqat, Anwar Ul-Hamid
Summary: This report focuses on the effect of Ga-Gd co-substitution on the structural, conductivity, and dielectric properties of NCZGaGd NSFs. The study extensively evaluates the electrical and dielectric parameters of NCZGaGd NSFs as functions of bias frequency, measurement temperature, and co-substitution ratios. XRD analyses confirm the cubic spinel structures, while TEM and FE-SEM along with EDX investigate the morphology and chemical composition of the products. The results show significant effects of co-substitution on the conduction mechanism and dielectric responses of the ternary NiCuZn NSFs system.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Mohamed Jaffer Sadiq Mohamed, Serkan Caliskan, Mohammed Ashraf Gondal, Munirah Abdullah Almessiere, Abdulhadi Baykal, Yassine Slimani, Khaled Abdelsabour Elsayed, Muhammad Hassan, Ismail Abdullah Auwal, Abdul Zeeshan Khan, Asif Ali Tahir, Anurag Roy
Summary: The magnetic properties of Co0.5Ni0.5Fe2O4 spinel ferrites can be tuned by Se doping, with increased coercivity and remanence at 10 K. An optimized catalyst, CoNi NSFs + 0.15% Se, exhibits superior electrocatalytic performance for the hydrogen evolution reaction (HER), with a low overpotential and high stability. This research is important for developing hard magnetic materials and efficient electrocatalysts for sustainable energy generation.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
S. Caliskan, M. A. Almessiere, A. Baykal, Y. Slimani, A. Demir Korkmaz, H. Gungunes, I. A. Auwal
Summary: Ni0.8Cu0.1Zn0.1MoxFe2-2xO4 (x <= 0.1) nanospinel ferrites (Mo -> NiCuZn NSFs) were synthesized using sol-gel method, showing a spinel structure formation without impurities. The nanoparticles' morphology and chemical composition were confirmed by SEM, TEM, HR-TEM, and EDX. The magnetic characteristics of Mo -> NiCuZn NSFs were investigated and revealed the significant role of Mo ions in influencing properties such as saturation magnetization, magnetic moment, coercivity, squareness ratio, and magneto-crystalline anisotropy constant. The samples exhibited superparamagnetic behavior at 300 K and magnetically soft behavior at 10 K.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
S. Caliskan, M. A. Almessiere, A. Baykal, Y. Slimani, H. Gungunes, A. Demir Korkmaz, A. Ul-Hamid, I. A. Auwal
Summary: The Ho3+ ion-substituted SrBa nanohexaferrites were synthesized using an ultrasonic-assisted sol-gel method. The hexagonal structure and plate-like morphology were confirmed by various microscopy techniques. The magnetic properties of the samples were analyzed and it was found that the magnetization improved with Ho substitution and decreased with temperature. The Ho-doped samples showed a magnetically soft behavior and exhibited anomalies in their M-T plots.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Mohamed Jaffer Sadiq Mohamed, Mohammed Ashraf Gondal, Muhammad Hassan, Munirah Abdullah Almessiere, Asif Ali Tahir, Anurag Roy
Summary: Offshore hydrogen production through water electrolysis presents significant challenges, but the use of WCSNCs catalysts can enhance the efficiency of the hydrogen evolution reaction, especially in alkaline and natural seawater environments.
Article
Chemistry, Medicinal
Suriya Rehman, Balasamy Rabindran Jermy, Irfan A. Rather, Jamal S. M. Sabir, Suhailah S. Aljameel, Munirah A. Almessiere, Yassine Slimani, Firdos A. Khan, Abdulhadi Baykal
Summary: This study investigates the synthesis of praseodymium ion-substituted nano-spinel ferrites and their potential applications in cancer treatment and antifungal activities. The results show that the synthesized nanomaterial has a significant effect on cancer cell viability and exhibits antifungal properties. The findings suggest that these nanotherapeutics have promising prospects in the pharmaceutical field.
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)
