Article
Materials Science, Ceramics
Sarwar Hasan, Bruska Azhdar
Summary: Nickel and zinc spinel ferrites were prepared using the sol-gel auto-combustion approach. XRD studies confirmed their spinel structure and determined their crystallite sizes. Morphological analysis revealed the size and shape of the nanoparticles. Energy dispersive spectroscopy verified the composition. Optical and magnetic studies were conducted, and the dielectric properties and AC conductivity were analyzed, showing significant differences between NFO and ZFO.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
M. Satish, H. M. Shashanka, S. Saha, Digvijay N. Singh, P. N. Anantharamaiah
Summary: This study investigates the effect of Cu-amalgamation on the microstructural, magnetic, magnetostrictive, and dielectric properties of sintered nickel ferrite ceramics. It is found that samples with Cu content up to 0.75 are phase pure, while samples with Cu content of 1 exhibit impurities and are excluded. The addition of Cu leads to a decrease in magnetic parameters and magnetostriction, while dielectric properties vary with frequency.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Applied
Sudhir Regmi, Zhong Li, Abhishek Srivastava, Rabin Mahat, Shambhu Kc, Ankur Rastogi, Zbigniew Galazka, Ranjan Datta, Tim Mewes, Arunava Gupta
Summary: The research shows that the growth of NiFe2O4 thin films on MgGa2O4 and ZnGa2O4 substrates varies significantly, with films grown on ZnGa2O4 substrate having near perfect matching and almost no strain, maintaining their cubic structure; while films grown on MgGa2O4 substrate exhibit significant strain.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Kh Roumaih
Summary: This study discusses the experimental results of the electrical and magnetic properties of NiF@MgF and ZnF@MgF, showing their varying conductive and magnetic behaviors at different temperatures with potential applications in electronic devices.
Article
Engineering, Electrical & Electronic
Xiang Zhang, Junwei An, Chen Ji, Yi Liu
Summary: Coatings with double-loss Ti3SiC2/NiFe2O4 absorbents of excellent chemical stability were synthesized in this study. Heat treating the Ti3SiC2/NiFe2O4 fillers at temperatures 800 to 1000 degrees C improved their microwave absorbing properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Applied
Takashi Iwamoto, Yohki Hieda, Yasumichi Kogai
Summary: Porous hydroxyapatite ceramics with macropores were synthesized and doped with zinc ions using a combination of chemical synthesis and heat treatment. The addition of zinc ions affected the lattice parameters of the hydroxyapatite phase, and the presence of a byproduct zinc oxide phase reduced cell adhesion compared to samples without zinc oxide.
JOURNAL OF POROUS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Dimpal Tomar, P. Jeevanandam
Summary: In this study, zinc ferrite nanoparticles with various morphologies were synthesized by thermal decomposition of Zn-Fe glycolates prepared under different synthetic conditions. The nanoparticles were characterized using different analytical techniques and their magnetic properties were investigated.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Condensed Matter
Oscar A. Restrepo, Oscar Arnache, Johans Restrepo, Charlotte S. Becquart, Normand Mousseau
Summary: Using Buckingham potentials, the mechanical properties of zinc spinel ferrites were studied and the effects of pressure and randomness of Ze and Fe on their properties were analyzed. It was found that pressure affects the deformations and brittleness of the materials, and partial inverse spinels exhibit better ductility. The randomness of Ze and Fe plays an important role in the formation and stability of vacancies in the inverse spinel.
SOLID STATE COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Murendeni I. Nemufulwi, Hendrik C. Swart, Katekani Shingange
Summary: Heterojunction interfaces between metal-oxides can significantly improve gas sensing through charge distribution caused by lattice mismatch. This study focuses on the positive synergistic effects of ZnO/ZnFe2O4 heterostructure, which exhibited the best sensing performance among pure ZnO and ZnFe2O4. The enhanced sensing properties were attributed to the higher concentration of oxygen vacancies at the ZnO/ZnFe2O4 interface and enhanced catalytic activity.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Physics, Applied
Jianliang Su, Chengwei Cai, Mei Ji
Summary: In this paper, [La0.8Ca0.2MnO3/La0.5Ca0.5MnO3](20) superlattice films with different La0.8Ca0.2MnO3 layer thicknesses were prepared by pulsed laser deposition. The crystal structures, strain, magnetic hysteresis loops, and magnetization versus temperature curves of the films were measured. The magnetic properties were comprehensively analyzed based on the strain state and magnetic phases.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Chemistry, Physical
Mohsen Elain Hajlaoui, Sirine Gharbi, Essebti Dhahri, Kamel Khirouni
Summary: This research investigates the conductivity and dielectric permittivity of ZnFe2O4 spinel ferrite as a function of frequency and temperature. The results show that the zinc ferrite sample exhibits thermally activated conductivity and high dielectric constant, making it suitable for super capacitor applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
A. Bajorek, C. Berger, M. Dulski, M. Zubko, S. Lewinska, K. Prusik, A. Slawska-Waniewska, F. Grasset, N. Randrianantoandro
Summary: The study compares NiFe2O4 (coprecipitation) and NiFe2O4@SiO2 (coprecipitation and microemulsion) ferrite nanoparticles in their as-received and annealed forms. The results show that thermal treatment induces gradual crystallization in the as-received samples, with the presence of cubic inverse spinel ferrite structure confirmed in all samples. FTIR spectroscopy confirms the spinel structure and other Fe-based states, while a nonstoichiometric hematite is detected in the annealed NiFe2O4 sample. The study also reveals changes in magnetic properties and electronic structure with the effects of crystallization, grain growth, and hematite separation.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Tianyu Hu, Jianjun Li, Lei Wang, Hongyang Wang, Zhanqun Zhang, Wenxu Jiang, Changguo Xue
Summary: Magnetic ZnO/ZnFe2O4/Zeolite (ZFZ) catalysts were synthesized using a solvothermal-microwave method and applied in advanced oxidation processes. The core-shell structured ZFZ with ZnO/ZnFe2O4 nanoparticles on Na-A zeolite surface exhibited a specific saturation magnetization of 15.276 emu/g, enabling efficient magnetic separation. The catalyst showed remarkable catalytic activity for peroxymonosulfate oxidation, with a degradation rate increasing more than 3 times under UV-light irradiation. The highest decomposition rate reached 98.55%, and 79.11% degradation rate remained after 5 cycles.
Article
Chemistry, Multidisciplinary
Jonas Ruby Sandemann, Kristoffer Andreas Holm Stockler, Xiaoping Wang, Bryan C. Chakoumakos, Bo Brummerstedt Iversen
Summary: Accurate structural models are crucial for understanding the structure-property relationships in functional materials. This study focuses on the complex crystal structures of spinels and establishes a benchmark crystal structure for defect-free spinel ferrite ZnFe2O4. Various diffraction techniques are used to provide reference data for testing and refining structural models. The results demonstrate the significance of atomic displacement parameters in accurately describing the cation inversion in spinel-type materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Xuening Han, Jie Li, Hao Wu, Kai Sun, Yixin Chen, Lijun Jia, Huaiwu Zhang, Pengjie Zhang, Chunyang Wu
Summary: This paper synthesized Bi-In co-substituted YIG ferrite materials through a conventional solid-state route and investigated their phase formation, microstructure, dielectric and magnetic properties. The results showed that Bi3+ ion substitution could reduce sintering temperature, increase bulk density, improve dielectric constant, and maintain high saturation magnetization, but led to an increase in FMR linewidth.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Physical
Tomas Hrbek, Peter Kus, Yuliia Kosto, Miquel Gamon Rodriguez, Iva Matolinova
Summary: This study presents a ruthenium-iridium-based catalyst prepared using magnetron sputtering for the anode of proton exchange membrane water electrolyzers, demonstrating its excellent activity and stability. Compared to the nanoparticle approach, magnetron sputtering allows the creation of thin films with unprecedented interconnectivity.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
A. G. Belous, O. I. V'yunov
Summary: The requirements for high-quality microwave (MW) dielectrics used in the development of cellular communication devices for the transition from 3G to 5G communication are discussed. The results of studies on different crystal structures of complex oxide systems, such as potassium tungsten bronze, perovskite, pucherite, dreyerite, scheelite, and high-quality MW dielectrics with different permittivities, are organized.
THEORETICAL AND EXPERIMENTAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Haiyan Kuang, Tongxiang Liang, Xiang He, Shan Wu, Vyunov Oleg, Dongfang Pang
Summary: In this study, BNT-6BT-xSm ferroelectric ceramics with different doping contents of samarium (Sm) were prepared using the solid-state reaction method. The introduction of Sm into the ceramic system led to a transition from order to disorder. The ceramics exhibited reduced grain size, decreased remnant polarization, and coercive field with increasing Sm content. However, the maximum electric field-induced strain and piezoelectric coefficient reached their highest values at a certain composition. Therefore, BNT-6BT-0.03Sm lead-free ferroelectric ceramic shows promise as a substitute for lead-based ferroelectric ceramics for piezoelectric actuators.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
O. Z. Yanchevskii, O. I. Vyunov, T. O. Plutenko, A. G. Belous, V. V. Trachevskii, I. Matolinova, K. Veltruska, V. Kalinovych, Ye Lobko
Summary: The microstructure, elements distribution, chemical composition of grains and grain boundaries, and the dielectric response of CCTO ceramics were investigated using various techniques. It was found that additives and milled particles can cause abnormal grain growth and the formation of low-melting eutectics at the grain boundaries. The presence of copper ions in different oxidation states and exchange spin interactions between them were confirmed in all samples.
Article
Engineering, Electrical & Electronic
Mykhail Y. Ilchenko, Olexander P. Zhivkov, Roman V. Kamarali, Olexii V. Lutchak, Olexander P. Fedorchuk, Oleg I. V'yunov, Anatolii G. Belous, Tetiana O. Plutenko, Gleb L. Avdeyenko
Summary: The amplitude and phase characteristics of metamaterial cells composed of microstrip and dielectric resonators were investigated. The circuits containing resonators with different quality factors and excited by different oscillation types possess two independent energy paths, enabling the simulation of Fano resonances and electromagnetically induced transparency. The effects related to the abnormal dispersion of metamaterial cells and the positive values of group delay were demonstrated. Experimental and calculated characteristics of metamaterial cells were compared, showing good agreement and validating the proposed models.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Multidisciplinary Sciences
Tetiana Plutenko, Oleg V'yunov, Oleksandr Fedorchuk, Borys Khomenko, Anatolii Belous
Summary: La0.67LixTi1-xAlxO3 ceramics were synthesized and the phase characteristics were studied. A morphotropic phase boundary of rhombohedral and tetragonal symmetries was observed in the concentration range of 0.05 < x < 0.15, while a single-phase solid solution with rhombohedral R 3 c symmetries was formed in the concentration range of 0.15 < x < 0.3. The average grain size of La0.67LixTi1-xAlxO3 ceramics increased from 5.23 μm to 8.76 μm as the value of x increased. The dielectric constant of all materials in the La0.67LixTi1-xAlxO3 system at 0.05 < x < 0.3 was found to be greater than 104 at frequencies up to 1 kHz, with the highest value observed for La0.67LixTi1-xAlxO3 (x = 0.2) solid solution with rhombohedral symmetry.
Article
Multidisciplinary Sciences
Maksym Popov, Yuzan Xiong, Igor Zavislyak, Hryhorii Chumak, Oleksandr Fedorchuk, Sujoy Saha, Rao Bidthanapally, Hongwei Qu, Michael R. R. Page, Gopalan Srinivasan
Summary: This work focuses on the design and fabrication of a hexagonal ferrite band-pass filter that can be tuned using either a magnetic field or an electric field. The filter achieves magnetic field tunability within the 8-12 GHz frequency range, and electric field tunability through the nonlinear magnetoelectric effect in the ferrite. With efforts to reduce insertion loss, the compact and power efficient filter has potential applications in reconfigurable RF/microwave devices and communication systems.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Ceramics
Haiyan Kuang, Xiang He, Vyunov Oleg, Shan Wu, Dongfang Pang
Summary: By doping with Pr element, the BNT-6BT ceramics exhibited composition-induced phase transition, enhanced grain growth, and improved piezoelectric and photoluminescence properties. This makes them competitive in actuators and multifunctional devices.
CERAMICS INTERNATIONAL
(2023)