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Nanoferrite Composites:
Published in Vineet Kumar, Praveen Guleria, Nandita Dasgupta, Shivendu Ranjan, Functionalized Nanomaterials II, 2021
Jalpa A. Vara, Pragnesh N. Dave
Ferrites are fundamentally ferromagnetic oxide substances having high permeability and resistivity, while the diffusion magnetization of ferrite is under partially that of ferromagnetic alloys. The ferrite has benefits as an application due to its high resistivity, high frequency, higher resistance of heat, superior decomposition resistance, and low cost. Although its vast application is as a bulk material, the source of magnetism is a nano range occurrence (Beringer and Heald 1954). The improvement of magnetic nanostructure materials is a topic of concern, and equally for the scientific importance of considering the exclusive functional properties of materials, and for the technological importance in increasing the act of obtaining substances.
Magnetic Needle Development
Published in Jon Dobson, Carlos Rinaldi, Nanomagnetic Actuation in Biomedicine, 2018
David Arnold, Zak Kaufman, Alexandra Garraud
Ferrites are commonly used as general-purpose magnets. They provide excellent corrosion resistance and low cost of manufacturing. However, they provide relatively poor magnetic properties. These magnets typically have remanence values less than 0.5 T. Some common ferrites include BaO·6(Fe2O3), SrO·6(Fe2O3), and PbO·6(Fe2O3). Although these materials are technically ferrimagnetic, they behave similarly to ferromagnets on a large scale.3
Basic Materials Engineering
Published in David A. Hansen, Robert B. Puyear, Materials Selection for Hydrocarbon and Chemical Plants, 2017
David A. Hansen, Robert B. Puyear
Ferrite is essentially pure iron at temperatures less than approximately 1675°F (915°C). It has a body-centered cubic crystal structure. Ferrite forms from austenite as the austenite cools from a normalizing heat treatment. Because ferrite does not contain enough carbon to permit the formation of martensite, it is not hardenable by heat treatment. Accordingly, steels composed only of ferrite are not hardenable by heat treatment. The most common example of a truly ferritic steel is Type 405 SS, a ferritic stainless steel.
One pot synthesis of calcium ferrite nanocomposite and synergistic effect on methyl orange as dye model
Published in Inorganic and Nano-Metal Chemistry, 2022
Ujwala S. Tayade, Amulrao U. Borse, Jyotsna S. Meshram
Ferrite is an important class of inorganic magnetic oxides which contains magnetic ions arranged in such a manner that it produces spontaneous magnetization while maintaining good electric and magnetic properties. The possibility of tailoring electric and magnetic properties depending upon the application is the most important characteristic of the hexagonal ferrites, which can be achieved by the partial substitution of trivalent, the simultaneous substitution of divalent-trivalent metal ion and other compatible combinations for Iron (Fe) in the parent hexagonal ferrite matrix.[11] Hexagonal ferrites have focused in the field of technological applications with cost-effective and simple manufacturing.[12] The electric and magnetic properties of the material depend upon the particle size, which is again mainly decided by the method of synthesis, sintering temperature, etc.[13]
Investigations on physical properties of Mg ferrite nanoparticles for microwave applications
Published in Journal of Microwave Power and Electromagnetic Energy, 2019
Siva Kumar Pendyala, K. Thyagarajan, A. Gurusampath Kumar, L. Obulapathi
Ferrites have play a vital role in the field of computer industry to develop the memory core devices, magnetic recording heads, microwave devices such as circulators, isolators, and inductor cores in electrical transformers, and so forth (Manjurul et al. 2008). Ferrites have unique characteristics such as low electrical conductivity, low dielectric loss, low device cost, high mechanical strength and environmental stability over wide range of frequencies. Mg-ferrite (MgFe2O4) exhibits spinel cubic structure with low magnetic anisotrophy at room temperature (RT; K1= −33 × 103 erg/cm3 at RT Akter and Hakim 2010) due to low magneto crystalline anisotropic energy. The nano-structured ferrites have an ideal characteristic of a small band gap, which is in the range of visible region (Masoudpanah et al. 2016). The visible region of the electromagnetic (EM) spectrum allows the ferrites efficiently for photo-catalytic reactions (Rais et al. 2014) and the degradation of different organic pollutants present in the environment (Casbeer et al. 2012; Nath et al. 2012; TahirFarid et al. 2017).
Structural, optical, room-temperature and low-temperature magnetic properties of Mg–Zn nanoferrite ceramics
Published in Journal of Asian Ceramic Societies, 2019
D. Ravi Kumar, Syed Ismail Ahmad, Ch. Abraham Lincoln, D. Ravinder
Nanocrystalline ferrites, which exhibit remarkable properties, are commonly used in production of electromagnetic components for various applications [1–3]. Soft ferrites have a variety of applications due to their exotic structural, magnetic and electrical properties, making them the subject of tremendous interest among researchers and scientists. Ferrites are primarily used in various inductance components, such as magnetic filter cores, transformers, deflection antennae, video magnetic heads and magnetic heads for multiple path communications. These materials have potential applications, moreover in such technologies as magnetic liquid absorbing materials, high-density recording media, radio receivers and electromagnetic wave absorbers [4–6]. Nanocrystalline ferrite particles have a larger number of atoms at their surface than in their interior and hence they consequently possess a large surface-to-volume ratio. Their surface is considered to consist of broken exchange bonds that cause a spin disorder that produces a spin-glass-like structure. This lowers the coordination of the surface atoms and produces a surface layer with high anisotropy, modifying their magnetic properties [7]. The disorderedly distribution of cations is different in the interior from that at the surface, causing a superexchange interaction through oxygen ions, which affects the magnetic properties [8,9]. Interest in spinal nanocrystalline ferrites [MFe2O4, M = Co, Ni, Mg, Zn, Mn, etc.] has significantly increased in the past few decades due to their extraordinary magnetic, electrical and optical properties. There is tremendous interest in low-temperature sintered transition metal oxides vis-á-vis Mg–Zn ferrites today for use in producing microwave devices and multilayer chip inductors due to their superior properties at high frequencies [10–12]. Nanocrystalline MgFe2O4 is a partially inverse spinel with large numbers of Mg2+ ions on the octahedral site, whereas ZnFe2O4 is spinel. The substitution of Zn into magnesium ferrite affects the distribution of the atoms, leading to different physical properties.