Article
Materials Science, Multidisciplinary
K. Subrahmanya Sarma, Ch. Rambabu, G. Vishnu Priya, M. K. Raju, D. Parajuli, Batoo Khalid Mujasam, Verma Ritesh, Kumar Rajesh, N. Murali, P. V. Lakshminarayana
Summary: M-type Al-Cr-substituted strontium hexaferrite powders were successfully synthesized and their structural, morphological, and magnetic properties were studied. The results showed that the saturation magnetization decreased and the coercivity initially decreased and then increased with increase in dopant concentration.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Ceramics
Ruoshui Liu, Lichen Wang, Xiang Yu, Zhiyi Xu, Huayang Gong, Tongyun Zhao, Fengxia Hu, Baogen Shen
Summary: The study demonstrates the enhancement of magnetocrystalline anisotropy (MA) in La-Co co-substituted strontium hexaferrite (La-Co SrM) due to the joint effect of Fe2+ and Co2+ ions. Co-substituted strontium hexaferrite SrFe12-xCoxO19 (Co-SrM) single crystals were grown to investigate the anisotropy of Co2+ single ions. The solubility of Co in this preparation condition is limited to 0.31, and for 0.03 < x <= 0.11, a 19% enhancement in uniaxial magnetic anisotropy field HA is observed, with only a 7% loss in saturation magnetization MS at 5 K. The enhanced HA of Co-SrM is even higher than that of La-Co SrM, making it suitable for use as permanent magnets in this concentration range. However, for x = 0.31, planar anisotropy is observed at 5 K. The potential nonlinear magnetic structure of Co-SrM remains to be discovered for magnetoelectric effects. This work serves as a significant complement to the magnetocrystalline anisotropy study of La-Co SrM.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Jun-Pyo Lim, Min-Gu Kang, Young-Min Kang
Summary: Enhanced permanent magnet performance was reported for multi-cation-substituted M-type Sr-hexaferrites prepared using conventional ceramic processes. A cation composition of Sr0.4Ca0.3La0.3Fe10.2Co0.1Mn0.1Si0.05Mg0.05O19 was obtained through stepwise and systematic cation composition designs, processing, and characterization. The magnet demonstrated improved coercivity and residual magnetic flux density compared to the non-substituted SrFe12O19 magnet.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Shivanshu Goel, Avesh Garg, Himangshu Bhusan Baskey, Mritunjay Kumar Pandey, Sachin Tyagi
Summary: The study investigated the effect of bio-waste derived activated carbon on the magnetic and dielectric properties of barium hexaferrite for microwave absorption application. The addition of activated carbon led to increased reflection loss and changes in dielectric and magnetic properties, impacting the microwave absorption properties of the composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Hossein Goodarzi, Manoochehr Sobhani
Summary: In this study, Mn0.76Zn0.24Fe2O4 spinel ferrite was fabricated with the addition of CaO. The addition of CaO improved the theoretical density and saturation magnetization of the samples.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Murli Kumar Manglam, Jyotirekha Mallick, Suman Kumari, Rabichandra Pandey, Manoranjan Kar
Summary: The synthesis of BHF and CZF composites with different weight percentages using a high energy planetary ball mill technique was studied. Characterization techniques such as XRD, FESEM, and EDX were employed to analyze the obtained powders, showing that the saturation magnetization of the composites increases with the concentration of CZF. An interesting magnetic interaction between the two phases was observed at a certain composition, as demonstrated by changes in the hysteresis loops.
SOLID STATE SCIENCES
(2021)
Article
Chemistry, Physical
Xiang Yu, Tianyu Yang, Chenhui Lv, Lichen Wang, Ruoshui Liu, Di'an Wu, Daming Tian, Shuli He
Summary: 10-nm MnxFe3-xO4 (x = 0, 0.3, 0.7) magnetic nanoparticles with single cubic structure were synthesized by thermal decomposition method. The magnetic properties and cation oxidation state of the nanoparticles were investigated. Mn doping induced lattice expansion and the fraction of Mn2+ and Mn3+ in the nanoparticles varied with different Mn concentrations. The saturation magnetization of the nanoparticles decreased with increasing Mn concentration due to lattice distortion, while preserving a constant value for Mn0.3Fe2.7O4 nanoparticles. Increasing the ratio of Mn2+ and avoiding lattice distortion are beneficial for improving the magnetic properties of manganese ferrite. In addition, Mn0.3Fe2.7O4 @SiO2 nanoparticles showed good magnetic hyperthermia properties in vitro.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Xiang Yu, Lichen Wang, Ruoshui Liu, Ningfang Zhou, Zhiyi Xu, Huayang Gong, Tongyun Zhao, Jirong Sun, Fengxia Hu, Baogen Shen
Summary: We synthesized Sr1-xNdxFe12-yCoyO19 (x = 0-0.25, y = 0-0.1) using a conventional ceramic route and analyzed the crystal structures using X-ray diffraction. With increasing Nd3+ and Co2+ contents, lattice constant a increases, while lattice constant c decreases. The magnetic properties are improved when x = y = 0.1 (equal co-substitution), and further improved when x is increased (unequal co-substitution), reaching optimum values of Ms = 76.4 emu/g and Hc = 5115 Oe due to the occupation of the 2a site by divalent Fe2+. The occupancies of Co2+ and Fe2+ are further verified using Raman spectroscopy.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Shereen Selvaraj, Uma Gandhi, L. John Berchmans, Umapathy Mangalanathan
Summary: Rare earth substituted strontium hexaferrite powders were synthesized through a molten salt route, showing improved magnetic properties in the substituted samples, with the samarium-doped sample exhibiting the highest magnetic measurements at room temperature. The temperature-dependent magnetic properties of strontium ferrites also showed potential for applications in magnetic field sensors as saturation magnetization and remanence increased with decreasing temperature.
MATERIALS TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Safia Anjum, Mehwish Sattar, Zeeshan Mustafa
Summary: The research investigated the impact of La+3 ions on the structural, morphological, optical, magnetic, and ferroelectric properties of barium hexaferrite samples. The study found that increasing La+3 ions led to a decrease in band energy and changes in magnetic properties, with lower polarizability in most samples suitable for high-frequency applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Mah Rukh Rehman, Muhammad Aftab Akram, Iftikhar Hussain Gul
Summary: In this study, cobalt-substituted strontium hexaferrite nanoparticles were synthesized using the sol-gel route, and their magnetic, electrical, and structural properties were investigated. The results showed that cobalt doping increased the saturation magnetization and decreased the coercivity, while exhibiting semiconductor behavior. Additionally, the dielectric constant decreased with increasing cobalt content.
Article
Materials Science, Ceramics
V. E. Zhivulin, E. A. Trofimov, O. Zaitseva, D. P. Sherstyuk, N. A. Cherkasova, S. Taskaev, D. A. Vinnik, Yu A. Alekhina, N. S. Perov, D. Tishkevich, T. Zubar, A. Trukhanov, S. Trukhanov
Summary: By using conventional ceramic technology, solid solutions based on SrFe12O19 strontium hexaferrite with deep co-substitution of Fe3+ iron cations by Al3+ aluminum, Ga3+ gallium, In3+ indium, Co3+ cobalt, and Cr3+ chromium cations were successfully obtained, resulting in the formation of high-entropy phases. The phase composition, unit cell parameters, and field and temperature properties of magnetization of the obtained samples were studied. The magnetic behavior revealed a cluster nature, with an average cluster diameter of about 400 nm, and was interpreted considering the effect of high configurational mixing entropy and magnetic dilution of the iron sub-lattice.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Condensed Matter
Xiang Yu, Ningfang Zhou, Ruoshui Liu, Lichen Wang, Zhiyi Xu, Huayang Gong, Tongyun Zhao, Jirong Sun, Fengxia Hu, Baogen Shen
Summary: The structure and magnetic properties of Zn2+-Sn4+ co-substituted M-type strontium ferrite were studied using various techniques. The results showed that the sample with x = 0.25 had the maximum saturation magnetization of 77 emu/g, making it a promising candidate for high-density magnetic recording materials.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
M. A. Darwish, V. A. Turchenko, A. T. Morchenko, V. G. Kostishyn, A. V. Timofeev, M. I. Sayyed, Zhipeng Sun, S. V. Podgornaya, E. L. Trukhanova, E. Yu. Kaniukov, S. V. Trukhanov, A. V. Trukhanov
Summary: The study demonstrates that tin-substituted hexaferrites can be used for both electromagnetic shielding and absorbing materials, showing potential for absorbing electromagnetic radiation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Ahmad Gholizadeh, Vajihe Banihashemi
Summary: Microstructural, magnetic, and dielectric properties of Ca-Sm co-substituted strontium hexaferrites were investigated. The results showed that the co-substitution increased the saturation magnetization and coercive field. Impedance analysis also revealed a decrease in the mobility of charge carriers in the co-substituted samples.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Electrochemistry
A. Sadykov, S. E. Kushnir, I. Roslyakov, A. E. Baranchikov, K. S. Napolskii
ELECTROCHEMISTRY COMMUNICATIONS
(2019)
Article
Chemistry, Multidisciplinary
Georgy A. Ermolaev, Sergey E. Kushnir, Nina A. Sapoletova, Kirin S. Napolskii
Article
Nanoscience & Nanotechnology
A. I. Sadykov, S. E. Kushnir, N. A. Sapoletova, V. K. Ivanov, K. S. Napolskii
SCRIPTA MATERIALIA
(2020)
Article
Chemistry, Inorganic & Nuclear
A. I. Sadykov, A. P. Leontev, S. E. Kushnir, A. V. Lukashin, K. S. Napolskii
Summary: Research shows a significant difference in dissolution kinetics of anodic aluminum oxide during and after anodizing, with lower electrolyte temperatures predicting an increase in maximum accessible thickness of the porous film.
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Nina A. Sapoletova, Sergey E. Kushnir, Kirill S. Napolskii
Summary: This study found that the etching of ATO cell walls during anodic oxidation is significantly enhanced under anodic polarization, resulting in a blue shift of the photonic band gap position in the photonic crystal. This is crucial for the synthesis of ATO photonic crystals with precise photonic band gap positions.
Article
Chemistry, Multidisciplinary
Sergey E. Kushnir, Nina A. Sapoletova, Ilya V. Roslyakov, Kirill S. Napolskii
Summary: One-dimensional photonic crystals (1D PhCs) with structure-dependent optical properties can be prepared by anodizing aluminium under oscillating conditions using different electrolytes and controlling the voltage profile. Anodic aluminium oxide (AAO) 1D PhCs with nonbranched macropores can be obtained by anodizing in phosphorous acid. The pore diameter modulation period is linearly related to the charge density and the position of the photonic band gap can be precisely controlled in the 0.63-1.96 μm range.
Article
Chemistry, Multidisciplinary
Ilya Roslyakov, Stepan Sotnichuk, Sergey E. Kushnir, Lev A. Trusov, Ivan Bozhev, Kirill S. Napolskii
Summary: This study investigates the interplay between the azimuthal alignment of pore nuclei array and the crystallographic orientation of aluminum in the anodization process. The results show that the preferred azimuthal orientation of pore nuclei rows can promote a high degree of pore ordering in anodic aluminum oxide (AAO). However, without a specified azimuthal orientation, crystallography-affected disorder increases with film thickness in AAO structure. These findings have implications for preparing defect-free porous films over 100 µm in thickness, which are crucial for various AAO applications.
Article
Nanoscience & Nanotechnology
I. Roslyakov, S. E. Kushnir, M. Tsymbarenko, N. A. Sapoletova, L. A. Trusov, K. S. Napolskii
Summary: The self-ordered anodic aluminium oxide (AAO) structure can increase the domain size by pre-patterning the aluminium surface with a defect-free hexagonal array of concaves. This can be achieved through precise control of the irradiation positions, beam energy, and ion dosage using focused gallium ion beam (Ga FIB) etching. The proposed multi-step anodizing procedure successfully covers a wide range of AAO interpore distances and can prevent gallium contamination.
Article
Chemistry, Multidisciplinary
Sergey E. Kushnir, Mikhail E. Kuznetsov, Ilya V. Roslyakov, Nikolay V. Lyskov, Kirill S. Napolskii
Summary: The influence of the crystallographic orientation of an Al substrate on the properties of AAO PhCs was investigated, and it was found that the cyclic anodizing of coarse-grained aluminium foils produces a mosaic of photonic crystals.
Article
Materials Science, Multidisciplinary
Kirill S. Napolskii, Alexey A. Noyan, Sergey E. Kushnir
Article
Chemistry, Physical
Mikhail B. Vialtsev, Alexander I. Dalinger, Egor V. Latipov, Leonid S. Lepnev, Sergey E. Kushnir, Sergey Z. Vatsadze, Valentina V. Utochnikova
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Sergey E. E. Kushnir, Tatiana Yu. Komarova, Kirill S. S. Napolskii
JOURNAL OF MATERIALS CHEMISTRY C
(2020)
Article
Physics, Condensed Matter
A. I. Sadykov, S. E. Kushnir, N. A. Sapoletova, K. S. Napolskii
JOURNAL OF SURFACE INVESTIGATION
(2020)
