Article
Chemistry, Physical
I. S. B. Ferraz, T. J. Castro, J. Mantilla, J. A. H. Coaquira, V. K. Garg, A. C. Oliveira, A. Franco Jr, P. C. Morais, S. W. da Silva
Summary: Aluminum-substituted cobalt ferrite nanoparticles synthesized by combustion reaction method exhibit excellent structural and property characteristics, making them promising candidates for applications in stress sensors, actuators, and magnetostrictive filters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
K. Venkata Siva, Amritesh Kumar, J. Arout Chelvane, A. Arockiarajan
Summary: This study investigates the magnetostrictive properties of cobalt ferrite by substituting ions. The results demonstrate the significance of doping transition metal ions in enhancing the magnetostrictive characteristics.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
H. M. Shashanka, P. N. Anantharamaiah
Summary: This study investigates the magnetostrictive characteristics of sintered CoFe2O4 (CFO), Co0.85Ni0.15Fe1.85Ga0.15O4 (CNFGO15), and Co0.85Mg0.15Fe1.85Ga0.15O4 (CMFGO15) ceramics. The CMFGO15 sample exhibits enhanced strain sensitivity at low magnetic fields compared to the other two samples, with a maximum strain sensitivity nearly 160% higher than the values found for the other two samples even at remarkable low field.
SOLID STATE SCIENCES
(2023)
Article
Polymer Science
Chandra Sekhar Beera, B. Dhanalakshmi, D. Nirmala Devi, D. Vijayalakshmi, Akanksha Mishra, S. Ramesh, B. Parvatheeswara Rao, P. Shyamala, Melita Menelaou, Nadyah Alanazi, Abdullah N. Alodhayb
Summary: Chromium-doped cobalt ferrite nanoparticles were synthesized and their magnetic properties were studied, showing that the introduction of chromium led to changes in the material's magnetic properties.
Article
Nanoscience & Nanotechnology
Mudalagiriyappa Satish, Hadonahalli Munegowda Shashanka, Sujoy Saha, Keerthi Haritha, Debabrata Das, Pendaranahalli Nadikeraiah Anantharamaiah, C. Ramana
Summary: This study investigates the effect of substituting Ni2+ with Co2+ on the crystal structure, phase, microstructure, magnetic properties, and magnetostrictive properties of NiFe2O4 (NFO). The Co-substituted NFO (Ni1-xCoxFe2O4, NCFO, 0<x<1) nanomaterials were synthesized and analyzed using various techniques. The results show that Co-substitution significantly influences the lattice constant, chemical bonding, and magnetic properties of NCFO, with potential applications in torque sensors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
P. N. Anantharamaiah, H. M. Shashanka, R. Kumar, J. A. Chelvane, B. Sahoo
Summary: Phase pure cobalt-ferrite and Zn-substituted cobalt-ferrite nanopowders were synthesized by a combustion route, showing excellent magnetostriction behavior for potential applications in highly sensitive strain sensors.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Miao Liu, Jiheng Li, Jiquan Wang, Hongyu Yi, Xiaoqian Bao, Xuexu Gao
Summary: Mn-Zn binary co-substituted cobalt ferrite (Co1-x(MnZn)xFe2O4 (0 <= x <= 0.4)) was synthesized by conventionally compacting and magnetic field assisted injection molding. XRD and SEM analysis characterized the single-phase spinel structure, preferred (001) orientation, and uniform grain size. XPS analysis reveals the cation redistri-bution in the mixed spinel structure of co-substituted samples, which has a direct consequence on magnetic properties. The addition of Mn-Zn increases the saturation magnetization (Ms), while decreases magneto-crystalline anisotropy constant (K1), leading to a decrease of magnetostrictive saturation field (HS). Pressure samples showed a maximum (d lambda/dH)max of -0.15 ppm/Oe under 300 Oe applied field at x = 0.2. Samples with (001) fiber texture were prepared by magnetic field alignment, achieving a higher magnetostriction lambda S of -432 ppm, which is 200% higher than pressed samples, and a corresponding maximum strain derivative (d lambda/dH)max of -0.88 ppm/Oe at a lower magnetic field.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Chemistry, Physical
P. N. Anantharamaiah, B. Prerna Rao, H. M. Shashanka, J. A. Chelvane, V. Khopkar, B. Sahoo
Summary: The study investigates the effect of Mg2+ and In3+ substitution on the structural, magnetic, magnetostrictive, and dielectric properties of NiFe2O4 samples. It was found that In3+ substituted sample showed better grain growth after sintering, as confirmed through microscopy and dielectric results.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
H. Lane, E. E. Rodriguez, H. C. Walker, Ch Niedermayer, U. Stuhr, R. Bewley, D. J. Voneshen, M. A. Green, J. A. Rodriguez-Rivera, P. Fouquet, S-W Cheong, J. P. Attfield, R. A. Ewings, C. Stock
Summary: CaFe2O4 is an S = 5/2 antiferromagnet exhibiting two magnetic orders, with the low-temperature A phase order finding its origins in the freezing of antiphase boundaries created by thermal fluctuations. The magnetic order observed in this material results from a competition between exchange coupling and single-ion anisotropy.
Article
Physics, Applied
Sudhir Regmi, Zhong Li, K. C. Shambhu, Rabin Mahat, Ankur Rastogi, Ranjan Datta, Arunava Gupta
Summary: Epitaxial thin films of cobalt ferrite have been successfully grown on isostructural substrates using pulsed laser deposition. The films on ZnGa2O4 substrates are defect-free and under slight compressive strain, while the films on MgGa2O4 substrates show strain relaxation and defect formation.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Pendaranahalli Nadikeraiah Anantharamaiah, Hadonahalli Munegowda Shashanka, Srikari Srinivasan, Debabrata Das, Ahmed A. El-Gendy, C. V. Ramana
Summary: This study reports on the fabrication, characterization, and evaluation of cobalt ferrite nanocrystalline thin films on a flexible mica substrate. The CFO films exhibited single-phase and nanocrystalline nature, spherical shape morphology, and suitable magnetic and magnetostrictive properties for flexible sensor devices.
Article
Engineering, Electrical & Electronic
Nitika, Anu Rana, Vinod Kumar
Summary: Co1-xFe(II)(x)Fe2O4 (x = 0, 0.25, 0.50, 0.75, 1) ferrites were synthesized by coprecipitation. The substitution of ferrous ions and annealing were found to affect the structural, optical, magnetic, and dielectric properties. The study showed that annealing increased crystallite size, improved magnetic parameters, increased optical bandgap, and enhanced dielectric properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Inna V. Lisnevskaya, Dmitry O. Popod'ko, Mikhail I. Tolstunov
Summary: Perovskite-like rhombohedral distorted solid solutions of BiFe1-x(M1/2Ti1/2)(x)O-3 (M = Co, Ni, Zn, x = 0-0.11) were synthesized. The solid solution formation is indicated by the change in unit cell parameters, corresponding to the ionic radii of the mixed cations (M1/2Ti1/2)3+ (M = Co, Ni, Zn). BiFe1-x(M1/2Ti1/2)(x)O-3 (M = Co, Ni) solid solutions exhibit ferromagnetic hysteresis pels at room temperature, while BiFe1-x(Zn1/2Ti1/2)(x)O-3 does not. As x increases from 0.01 to 0.11, the saturation magnetization MS and remanent magnetization MR increase, while the coercive force Hc decreases. For the BiFe1-x(Co1/2Ti1/2)(x)O-3 system, higher magnetic properties with a more complex dependence on x are observed. The materials obtained can be classified as high-temperature multiferroics.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Yu. P. Sukhorukov, A. V. Telegin, S. V. Naumov, E. A. Surzhikov
Summary: The magnetic, magneto-elastic, optical, and magneto-optical properties of ferromagnetic magnetostrictive spinel MnFe2O4 were investigated. A correlation between magnetoreflection and magnetostriction was discovered, and the magnetorefractive effect and magnetooptical conductivity were calculated. The magnetoelastic properties of MnFe2O4 contribute significantly to the magnetic anisotropy constant.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jie Hua, Zeyuan Cheng, Zihang Chen, He Dong, Peiding Li, Jin Wang
Summary: The study found that the crystallite size of Co1-xCuxFe2O4 nanoparticles embedded in a SiO2 matrix increased with the Cu2+ doping content, and that Cu2+ doping at the octahedral B sites led to a slight deformation of octahedral symmetry, resulting in cation migration between octahedral A and tetrahedral B sites. Increasing Cu2+ content initially increased the saturation magnetization, then tended to decrease, while the coercivity decreased continuously, indicating an important role of Cu2+ doping content in the magnetic properties of Co1-xCuxFe2O4 nanoparticles.
Article
Materials Science, Multidisciplinary
P. N. Anantharamaiah, P. A. Joy
Article
Materials Science, Ceramics
P. N. Anantharamaiah, Sanjukta Mondal, K. S. Manasa, Sujoy Saha, Maya M. Pai
CERAMICS INTERNATIONAL
(2020)
Article
Chemistry, Physical
P. N. Anantharamaiah, Sanjukta Mondal, Sujoy Saha
Summary: This study demonstrates induced catalytic activity in hard magnetic strontium hexaferrite system by replacing Fe with Cu, with SrCu(0.3)Fe(11.7)O(19) showing superior catalytic performance in transforming 4-nitrophenol to 4-aminophenol within 8 minutes. Reusability test confirmed 100% activity retention even after five consecutive cycles for the SrCu(0.3)Fe(11.7)O(19) catalyst.
Article
Materials Science, Ceramics
William Remlalfaka, Chinnasamy Murugesan, P. N. Anantharamaiah, N. Manikanda Prabu
Summary: Bismuth vanadate and nickel ferrite nanoceramics were synthesized and three composites were prepared, with the 50 wt% BiVO4 + 50 wt% NiFe2O4 composite showing the highest photocatalytic activity. These magnetic composites can achieve 80% dye degradation efficiency under sunlight and can be easily separated using a laboratory magnet.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
P. N. Anantharamaiah, H. M. Shashanka, R. Kumar, J. A. Chelvane, B. Sahoo
Summary: Phase pure cobalt-ferrite and Zn-substituted cobalt-ferrite nanopowders were synthesized by a combustion route, showing excellent magnetostriction behavior for potential applications in highly sensitive strain sensors.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
K. Chandrika Chandrika, P. N. Anantharamaiah, R. Hari Krishna, A. G. Jineesh, T. Niranjana Prabhu
Summary: This study successfully synthesized CoFe2O4-TiO2 (p-n) catalyst by the modified sol-gel route and optimized the experimental parameters for photocatalysis. The research found that pH is the critical influencing factor on photocatalysis, followed by catalyst dosage, mixing speed, and irradiation time.
MATERIALS TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Pendaranahalli Nadikeraiah Anantharamaiah, Hadonahalli Munegowda Shashanka, Sujoy Saha, Keerthi Haritha, C. Ramana
Summary: By substituting a non-magnetic cation for a magnetic cation, otherwise catalytically inactive magnetic materials can be transformed into catalytically active materials. The catalytic performance of Al-doped SrFe12O19 nanomaterials in the reduction reaction of 4-nitrophenol demonstrates good activity due to the presence of Al ions in the hexaferrite lattice structure.
Article
Chemistry, Physical
Pendaranahalli Nadikeraiah Anantharamaiah, Prerna Rao, Hadonahalli Munegowda Shashanka, Vijay Khopkar, Jeyaramane Arout Chelvane, Balaram Sahoo, C. Ramana
Summary: The tunable dielectric properties of cation-substituted nickel ferrite have been achieved through selective engineering of crystallographic site occupation. The occupation of different sites by Mg2+ and In3+, as confirmed by spectroscopy, leads to variations in dielectric constant and activation energy.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Pendaranahalli Nadikeraiah Anantharamaiah, Hadonahalli Munegowda Shashanka, Srikari Srinivasan, Debabrata Das, Ahmed A. El-Gendy, C. V. Ramana
Summary: This study reports on the fabrication, characterization, and evaluation of cobalt ferrite nanocrystalline thin films on a flexible mica substrate. The CFO films exhibited single-phase and nanocrystalline nature, spherical shape morphology, and suitable magnetic and magnetostrictive properties for flexible sensor devices.
Article
Nanoscience & Nanotechnology
Mudalagiriyappa Satish, Hadonahalli Munegowda Shashanka, Sujoy Saha, Keerthi Haritha, Debabrata Das, Pendaranahalli Nadikeraiah Anantharamaiah, C. Ramana
Summary: This study investigates the effect of substituting Ni2+ with Co2+ on the crystal structure, phase, microstructure, magnetic properties, and magnetostrictive properties of NiFe2O4 (NFO). The Co-substituted NFO (Ni1-xCoxFe2O4, NCFO, 0<x<1) nanomaterials were synthesized and analyzed using various techniques. The results show that Co-substitution significantly influences the lattice constant, chemical bonding, and magnetic properties of NCFO, with potential applications in torque sensors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
H. M. Shashanka, Sujoy Saha, Keerthi Haritha, P. N. Anantharamaiah, C. V. Ramana
Summary: We report on the influence of Al and Zn co-substitution on the structural, magnetic, and magnetostrictive properties of CZFAO materials. The incorporation of smaller Al3+ ions in spinel ferrite leads to a reduction in crystallite size and lattice parameter. Al-Zn substitution induces grain growth, resulting in a dense, interconnected grain morphology. The magnetic properties of CZFAO, such as saturation magnetization and coercivity, decrease with increasing x due to the non-magnetic character of the substituents.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Ceramics
M. Satish, H. M. Shashanka, S. Saha, P. N. Anantharamaiah, C. V. Ramana
Summary: This study reports on the enhanced magnetostrictive characteristics of composites derived from hard cobalt ferrite (CFO) and soft nickel ferrite (NFO) materials. The composites were synthesized using a cost-effective and eco-friendly method, and their phase purity, surface morphology, magnetic properties, and magnetostrictive characteristics were evaluated. The composites exhibited better magnetostriction at lower magnetic fields compared to the parent sintered CFO and NFO samples, and their structure-phase-property correlation could provide a roadmap for their potential applications in electromagnetic devices.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
S. Kalpana, Vinay S. Bhat, G. Hegde, T. Niranjana Prabhu, P. N. Anantharamaiah
Summary: Two synthesis methods, autocombustion and sol-gel, were used to produce nearly spherical and polygonal shaped nanomaterials of spinel cobalt oxide as electrode materials. Analysis revealed different particle morphologies and crystallite sizes for the two samples, as well as variations in surface area and specific capacitance. Autocombustion method exhibited superior energy storage capability and higher surface area compared to sol-gel method.
Article
Chemistry, Physical
P. N. Anantharamaiah, B. Prerna Rao, H. M. Shashanka, J. A. Chelvane, V. Khopkar, B. Sahoo
Summary: The study investigates the effect of Mg2+ and In3+ substitution on the structural, magnetic, magnetostrictive, and dielectric properties of NiFe2O4 samples. It was found that In3+ substituted sample showed better grain growth after sintering, as confirmed through microscopy and dielectric results.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
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)
