Octahedral sites in Fe3O4 contain both ferrous and ferric with electrons
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Author : LZH
Update time : 2023-06-08 10:31:12
What is Fe3O4? The preparation ofFe3O4 is carried out under anaerobic conditions through the oxidization reaction of ferrous hydroxide Fe(OH)2 in an aqueous solution to yield hydrogen gas and Fe3O4. Fe3O4, with a favorable crystalline structure, is more stable than ferrous hydroxide. In this order, Fe3O4 could be synthesized in the laboratory scales as a ferrofluid by mixing FeCl3 and FeCl2 in alkaline conditions with sodium hydroxide. In a different method, Fe3O4 could be obtained via chemical co-precipitation in alkaline conditions in the presence of ammonia and agitation at 2000 rpm. In this case, FeCl3 and FeCl2 must be kept at a molar ratio of 2:1. They are heated at 70°C, immediate agitation at 7500 rpm, and the quick addition of ammonium hydroxide until a dark residue is obtained. Other synthetic methods involve reverse micelle, copolymer templates, solvothermal reduction, and thermal decomposition 2.
Octahedral sites in Fe3O4 contain both ferrous and ferric with electrons As it was discussed earlier, octahedral sites in Fe3O4 contain both ferrous (Fe2+) and ferric (Fe3+) with electrons coordinated with these cations being thermally delocalized, leading to the migration of electrons within the limits of Fe3O4 structure to finally result in high conductivity. The transitional temperature of Fe3O4 causes regular arrangement of ferrous and ferric iron cations in the fabric of octahedral sites. Such an arrangement inhibits electron delocalization when the temperature falls. Additionally, Fe3O4 could be a bit of a deficient metal crystal on octahedral sites. This lack of metallic property leads to n-type p-type magnetite semiconductors. The magnetic properties are particularly dependent on the Fe3O4’s Curie temperature, which was discussed already. At thermal conditions lower than the Curie temperature, the magnetic moments of tetrahedral sites occupied by ferric irons get aligned ferromagnetically. In contrast, the magnetic moments on octahedral sites get occupied by both ferric and ferrous species, which cancel each other, leading to an antiferromagnetic nature. This means Fe3O4 is ferrimagnetic at room temperature. However, as the temperature rises to Curie temperature, the ferromagnetic alignment of magnetic moments is destroyed by thermal fluctuations on tetrahedral sites where ferrimagnetic strength is diminished. Therefore, when the Curie temperature is achieved, magnetization falls to zero, leading to a rise in super magnetic behavior 2.
Applications of Fe3O4 Given the magnetic properties, there are potential opportunities for the incorporation of Fe3O4 in applications, namely cell separation, environmental contaminant removal, sealing agents as liquid o-rings, magneto cytolysis, cooling mechanisms in loudspeakers and dumping, contrasting agents, high gradient magnetic separation, ferrofluids, magnetic resonance tomography magnetically guided drug delivery and mechano-electrical application. Fe3O4 used in high gradient magnetic separation involves the magnetic separation of suspended particles. An example of using magnetite in this technology is implementing fine powder of Fe3O4 in traditional water treatment plant coagulation. In this application, fine magnetite powders serve as seeding agents with magnetic properties to eventually form active magnetic flocs with other suspended particles. Fine magnetite powders have an interesting application, and colloidal suspensions contain fine magnetic particles called ferrofluids where strong magnetic fields are present. Ferrofluids could grow spikes along the applied magnetic field lines with some particular applications in technology.
Price of Fe3O4 Fe3O4 particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Fe3O4. A large amount of large amount will be lower. The Price of Fe3O4 is on our company's official website.
Fe3O4 supplier Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Fe3O4, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective Fe3O4, you are welcome to contact usor inquire at any time.
