Article
Materials Science, Multidisciplinary
M. S. Anwar, Bon Heun Koo
Summary: This study investigates the magnetic critical behavior of Mn0.5Zn0.5Fe2O4 spinel ferrite and reveals its paramagnetic-to-ferromagnetic transition to be of second order. The results also show that the compound exhibits significant magnetic entropy change and refrigeration capacity under an applied magnetic field. The obtained critical exponents suggest that the critical behavior of the compound is close to a mean-field model.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Inorganic & Nuclear
Qiang Zhang, Yohann Breard, Vincent Hardy
Summary: The preparation, complex magnetic properties, and room-temperature magnetocaloric effect of Nd(Cu3-xMnx)-Mn4O12 compounds with cation distribution have been studied. The compounds exhibit high refrigerant capacity values at room temperature.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Jiyu Hu, Chaocheng Liu, Meiling Wang, Min Wang, Shouguo Wang, Ganheng Zheng, Yongqing Ma
Summary: The critical behavior of CoGa1.2Fe0.8O4 ferrites with Ga-doped at the Fe-sites has been studied, revealing its long-range ferromagnetic interaction, which is different from the magnetic interaction in the previously studied NixZn1-xFe2O4 ferrites.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Sibasish Mandal, Samrat Mukherjee
Summary: A detailed investigation of magnetocaloric properties and critical behavior of Zn0.7Co0.3Fe2O4 nanoparticles synthesized via chemical co-precipitation method was conducted. The crystal structure of ZnxCo1-xFe2O4 (x = 0.5, 0.6, 0.7) nanoparticles was confirmed as Fd 3m through Rietveld analysis of the XRD patterns. The W-H plots showed the presence of compressive micro strain inside the crystallites, with a decreasing trend observed with Zn doping. The magnetization measurements indicated superparamagnetic behavior at room temperature for all samples, with the coexistence of magnetic phases below room temperature in Zn-0.6 and Zn-0.7 samples. The substitution of Zn2 thorn ions led to a decrease in blocking temperature (TB) and Curie temperature (TC). Analysis of the magnetocaloric properties of the Zn-0.7 sample revealed a significant magnetic entropy change and relative cooling power, as well as the expected observation of inverse MCE due to antiferromagnetism at low temperature.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Physics, Condensed Matter
Hem Raj Sharma, Khalid Mujasam Batoo, R. Neffati, Pooja Dhiman, Sumit Bhardwaj, Pankaj Sharma, Sajjad Hussain, Indu Sharma, Rahul Goel, Gagan Kumar
Summary: Al-doped Mn ferrite nanoparticles were synthesized by solution combustion method, and the effects of Al3+ ions substitution on the structural, optical, electrical and magnetic properties were investigated. The results showed that Al3+ ion doping influenced the structural parameters, FTIR spectra and magnetic properties of the synthesized samples.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Chao Xu, Katharina Marker, Juhan Lee, Amoghavarsha Mahadevegowda, Philip J. Reeves, Sarah J. Day, Matthias F. Groh, Steffen P. Emge, Caterina Ducati, B. Layla Mehdi, Chiu C. Tang, Clare P. Grey
Summary: A structure-driven degradation mechanism is proposed for Ni-rich layered cathode material NMC811, in which a proportion of the material exhibits a lowered accessible state of charge and becomes fatigued after repetitive cycling. This degradation is attributed to high interfacial lattice strain between the reconstructed surface and the bulk layered structure above a distinct threshold.
Article
Materials Science, Multidisciplinary
S. Mansouri, M. Balli, S. Jandl, A. O. Suleiman, P. Fournier, M. Orlita, I. A. Zobkalo, S. N. Barilo, M. Chaker
Summary: The multiferroic and rotating magnetocaloric properties of Nd0.8Tb0.2Mn2O5 are investigated in this study. The results show changes in the structural units and the impact of Nd-Tb interaction on the magnetic and ferroelectric properties of the sample. The study also provides insights into the magnetocrystalline anisotropy and rotating magnetocaloric effect of Nd0.8Tb0.2Mn2O5.
Article
Materials Science, Ceramics
Nitika, Anu Rana, Vinod Kumar, A. M. Awasthi
Summary: The study focuses on synthesizing Lanthanum-doped cobalt ferrite nanoparticles for high-frequency devices in 5G telecommunication systems. These nanoparticles exhibit enhanced magnetic and dielectric properties, making them suitable for applications in wireless communication. The inclusion of rare-earth ions and high annealing temperatures significantly affect the magnetic and dielectric properties of the ferrite nanoparticles.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Jingkui Zhao, Xiansong Liu, Xucai Kan, Chaocheng Liu, Wei Wang, Jiyu Hu, Qingrong Lv, Jingwen Huang, Mudssir Shazeda
Summary: In this study, a Mg0.35Zn0.65Fe2O4 ferrite sample was successfully prepared and comprehensive studies on its structure, magnetism, magnetocaloric effect, and critical behavior were conducted. The sample exhibited ferromagnetic and paramagnetic phases at temperatures Tc = 295K and Tp = 330K, respectively. The sample showed good magnetic properties under an external magnetic field H = 50 kOe.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Ghulam Mustafa, Muhammad Khalid, Ali Dad Chandio, Kiran Shahzadi, Zaheer Uddin, Junaid Kareem Khan, Naimat Ullah Channa, Zaheer Abbas Gilani, H. M. Noor ul Huda Khan Asghar
Summary: A series of lanthanum-doped nickel ferrites were synthesized and their dielectric properties were studied. The results showed that the La doping induced lattice strain and affected the lattice constant, resulting in changes in dielectric loss and dielectric constant. The materials exhibited the most stable dielectric properties at high frequencies, making them potential candidates for microwave devices.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
M. Kamran, Yasir Abbas, M. Anis-ur-Rehman
Summary: Ce3+ and La3+ co-substituted cobalt ferrites were synthesized by co-precipitation method and their structural, dielectric, AC electrical properties, impedance spectroscopy and DC electrical measurements were investigated. X-ray diffraction analysis confirmed the desired single-phased spinel cubic lattice structure. The lattice constant increased while the crystallite size decreased with rare earth substitution. The frequency dependent dielectric measurements exhibited a dispersive behavior at low frequency and remained frequency-independent at high frequency. The AC conductivity increased with increasing frequency and was explained by Jonscher's power law. The impedance spectra showed a dielectric relaxation phenomenon and the grain-boundaries played a dominant role in the dielectric response, as confirmed by Nyquist plots. The temperature dependent DC resistivity increased with the addition of Ce3+ and La3+, indicating a semiconducting nature.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
F. S. El-Sbakhy, M. I. Abdel-Ati, A. M. Abdelghany, O. M. Hemeda
Summary: The spinel ferrite Ni system was successfully synthesized using the flash auto-combustion method. Characterization using XRD, IR, TEM and SEM confirmed the formation of spinel phase and presence of secondary phases. Increasing Mn2+ content led to an increase in lattice parameter and a decrease in crystallite size.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Materials Science, Ceramics
Ala Manohar, V. Vijayakanth, S. V. Prabhakar Vattikuti, Ki Hyeon Kim
Summary: Supercapacitors are extensively researched as one of the most promising energy storage devices due to their unique advantages. Mixed spinel ferrites have been widely used in electrochemical (EC) devices, thanks to their exceptional chemical stability and significant surface area. Nanoscale spinel ferrite particles have several promising applications compared to bulk materials, mainly influenced by particle sizes and surface coordinating environments.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Richard J. C. Dixey, Andrew Wildes, Patrick W. Doheny, Gavin B. G. Stenning, Paul J. Saines
Summary: This study reports the competitive magnetocaloric effect of lanthanide fluoride materials with high magnetic anisotropy. Among them, HoF3 shows a high magnetocaloric entropy change under modest applied fields at higher temperatures and has the potential for cooling for hydrogen liquefaction. Spin-polarized neutron spectroscopy indicates that its promising magnetocaloric effect is likely due to the presence of ferromagnetic fluctuations of highly anisotropic magnetic moments, while its singlet electronic ground state and low-temperature magnetic ordering lead to a decrease in its magnetocaloric performance below 4 K.
Article
Materials Science, Ceramics
S. A. Mazen, A. S. Nawara, N. Abu-Elsaad
Summary: The electrical characteristics of Mn/Co/Cu-substituted Ni-Zn ferrites prepared using the citrate technique were studied in detail by ac impedance spectroscopy. The results showed a significant improvement in dielectric properties and the Ni-Zn-Cu ferrite series displayed the best dielectric performance, suggesting its suitability for high-frequency devices.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Inmaculada Alvarez-Serrano, Paloma Almodovar, David Agustin Giraldo, Francisco Llopis, Benjamin Solsona, Maria Luisa Lopez
Summary: A set of multiphase manganese-oxide composite materials and a birnessite-type KxMnO2 oxide were prepared and evaluated as cathodes for Zn-ion batteries. The results showed that these materials enhanced the electrochemical response. It was found that a zinc salt formed a phase coating on the composite electrodes during the charging stage, contributing to the extended lifetime of the batteries. Additionally, the composite materials and KxMnO2 electrode exhibited excellent performance under different current densities and electrolyte conditions.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Farah Lamara, Nedjemeddine Bounar, Benjamin Solsona, Francisco J. Llopis, Maria Pilar Pico, Daniel Alonso-Dominguez, Maria Luisa Lopez, Inmaculada Alvarez-Serrano
Summary: In this study, six different microstructures of CeO2 samples were successfully prepared using diverse synthesis routes, and their influence on the electrochemical response of the anodes was analyzed. The Ce-CMK3 sample, synthesized from a CMK3 silica template, showed an enhanced electrochemical response.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Maria Luisa Lopez, Inmaculada Alvarez-Serrano, David Agustin Giraldo, Paloma Almodovar, Elena Rodriguez-Aguado, Enrique Rodriguez-Castellon
Summary: KxMnO2 materials with different degrees of crystallinity were synthesized using two different methods. The sample obtained at high temperature exhibit a lower oxidation state for manganese ions and a denser morphology, resulting in a lower capacity value. In contrast, the sample obtained at low temperature or by hydrothermal method presents a manganese oxidation state close to 4 and a more porous morphology, leading to higher capacity values. The higher capacity loss obtained for one compound could be attributed to the stabilization of a ZnMn2O4 spinel-type phase.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
A. Redondo-Cubero, F. J. Palomares, K. Lorenz, J. Rubio-Zuazo, R. Huebner, F. J. Mompean, M. Garcia-Hernandez, G. R. Castro, L. Vazquez
Summary: This paper investigates the dynamics of the pattern induced on a silicon surface by oblique incidence of a 40 keV Fe ion beam. The results show that the Fe-induced pattern differs from two reference systems and exhibits a short hexagonal ordering structure. The metal pathway plays a critical role in determining the morphological, chemical, and magnetic properties of the patterns.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Rainer Schmidt, Felix Carrascoso Plana, Norbert Marcel Nemes, Federico Mompean, Mar Garcia-Hernandez
Summary: This work demonstrates the use of electrical impedance spectroscopy (EIS) to analyze the dielectric contributions in encapsulated single graphene layers. The dielectric data qualitatively vary with the resistance of the graphene layers. For low graphene resistance, the dielectric spectra are dominated by inductive contributions, which can be separated from the intrinsic graphene resistance using an appropriate equivalent circuit model. However, for high graphene resistance, the analysis is not feasible due to the limitations of the EIS technique at high frequencies.
Article
Electrochemistry
D. A. Giraldo, P. Almodovar, I Alvarez-Serrano, J. Chacon, M. L. Lopez
Summary: The electrochemical activity of different MnO2 phases as electrodes for aluminium-ion batteries (AIBs) was studied. Two different synthesis routes were used to obtain rod-like α-MnO2 and hexagonal micro-pellets with lamellar δ-MnO2 structures. α-MnO2 exhibited outstanding capacity and stability at high current densities, while δ-MnO2 showed good capacity and efficiency. Cyclic voltammetry measurements provided insights into the electrochemical behavior and the contribution of diffusive and capacitive-controlled mechanisms in the AIB system. The study also revealed the dimensionalities of α-MnO2 (1D) and δ-MnO2 (2D) and their performance in AIBs-1.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Agricultural Engineering
Adrian Garcia, Eleonora Monti, Alessia Ventimiglia, Nikolaos Dimitratos, Pablo J. Miguel, Maria Luisa Lopez, Inmaculada Alvarez-Serrano, Tomas Garcia, Maria Pilar Pico, Ana M. Dejoz, Benjamin Solsona
Summary: The use of biomass as an alternative energy source is extensively studied due to high value products like gamma-valerolactone that can be derived from biomass. This study demonstrates the efficient production of gamma-valerolactone from furfural using sepiolite supported Zr catalysts. Catalysts with 9-17 wt% ZrO2 showed the highest yield, while catalysts with 9 wt% ZrO2 exhibited the highest turnover frequencies (TOFs) due to well-dispersed ZrO2 nanoparticles. Lewis and Bronsted acid sites play essential roles in the one-pot transformation of furfural to gamma-valerolactone. The catalytic results obtained with sepiolite supported Zr catalysts are comparable to those achieved with zeolitic supported Zr catalysts.
BIOMASS & BIOENERGY
(2023)
Article
Physics, Applied
David Sanchez-Manzano, S. Mesoraca, F. Cuellar, M. Cabero, S. Rodriguez-Corvillo, V Rouco, F. Mompean, M. Garcia-Hernandez, J. M. Gonzalez-Calbet, C. Feuillet-Palma, N. Bergeal, J. Lesueur, C. Leon, Javier E. Villegas, J. Santamaria
Summary: The recent discovery of a long-range unconventional Josephson effect between YBa2Cu3O7 high Tc cuprates separated by a manganite ferromagnet has revealed a novel triplet proximity effect. The temperature dependence of the critical current in planar Josephson junctions was examined, and it was found that the behavior of the critical current follows the predictions of traditional superconductor-normal metal-superconductor junctions, suggesting that triplet pairs in a ferromagnet are transported similarly to singlet pairs in a normal metal. This result calls for theoretical studies of the new triplet Josephson effect and highlights its potential in future superconducting spintronics.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Edwin Herrera, Beilun Wu, Evan O'Leary, Alberto M. Ruiz, Miguel Agueda, Pablo Garcia Talavera, Victor Barrena, Jon Azpeitia, Carmen Munuera, Mar Garcia-Hernandez, Lin-Lin Wang, Adam Kaminski, Paul C. Canfield, Jose J. Baldovi, Isabel Guillamon, Hermann Suderow
Summary: The orthorhombic compound AuSn4 is similar to the Dirac node arc semimetal PtSn4 in composition. Unlike PtSn4, AuSn4 is a superconductor with a critical temperature of T-c = 2.35 K. Recent measurements indicate quasi-two-dimensional superconducting behavior in AuSn4.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Roberto Munoz, Laia Leon-Boigues, Elena Lopez-Elvira, Carmen Munuera, Luis Vazquez, Federico Mompean, Jose Angel Martin-Gago, Irene Palacio, Mar Garcia-Hernandez
Summary: The modification of graphene surface with polymers allows for expanding its applications as a hybrid material. However, the chemical inertness of graphene poses a challenge for covalent functionalization. Researchers have developed a clean and scalable method to enhance the graphene chemical activity and synthesized a large-scale graphene-polymer hybrid material.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Abdessalem Badri, Meriem Bembli, Inmaculada Alvarez-Serrano, Maria Luisa Lopez, Mongi Ben Amara
Summary: The new RbNiFe(PO4)2 phosphate was synthesized in single and powder forms using the flux method and solid state reaction. Characterization using various techniques revealed its crystal structure, which has a three-dimensional framework with large tunnels formed by chains of edge-sharing NiO6, isolated FeO5, and PO4 tetrahedra. The compound also exhibited a gap energy of 3.15 eV and d-d visible transitions related to the Ni2+ cation in octahedral coordination. Magnetic studies showed an antiferromagnetic character below a temperature of 21K.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Analytical
Paloma Almodovar, Belen Sotillo, David Giraldo, Joaquin Chacon, Inmaculada Alvarez-Serrano, Maria Luisa Lopez
Summary: This study presents a cost-effective method for producing high-performance cathodes for aluminum-air batteries. The electrochemical activity is enhanced by modifying commercial fuel cell cathodes through electrodeposition of nickel and manganese species. By combining the favorable properties of electrodeposited manganese species with nickel species, a high-performance cathode is obtained. The simplicity and cost-effectiveness of the electrodeposition method make it a viable option for large-scale production of high-performance cathodes for next-generation energy storage devices.
Article
Physics, Multidisciplinary
Francisco Martin-Vega, Edwin Herrera, Beilun Wu, Victor Barrena, Federico Mompean, Mar Garcia-Hernandez, Paul C. Canfield, Annica M. Black-Schaffer, Jose J. Baldovi, Isabel Guillamon, Hermann Suderow
Summary: The electronic band structure of Au2Pb features a Dirac cone which closes when it transitions into a low temperature superconducting phase, indicating possible topological properties at the surface. Scanning Tunneling Microscopy experiments on the superconducting surface reveal a sizable superconducting density of states at the Fermi level, possibly induced by surface states.
PHYSICAL REVIEW RESEARCH
(2022)
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)
