34 results about "Spinel ferrite" patented technology

Methods of forming spinel ferrite nanoparticles containing a chromium-substituted copper ferrite as well as properties (e.g. particle size, crystallite size, pore size, surface area) of these spinel ferrite nanoparticles are described. Methods of preventing or reducing microbe growth on a surface by applying these spinel ferrite nanoparticles onto the surface in the form of a suspension or an antimicrobial product are also described.

The invention discloses a high-entropy spinel ferrite catalyst for efficiently degrading dyes and antibiotics as well as a preparation method and application of the high-entropy spinel ferrite catalyst. The Cu1 / 2Zn1 / 2Fe2 / 3Co2 / 3Ni2 / 3O4 (HEO-FNCCZ) high-entropy spinel ferrite catalyst is prepared by adopting a sol combustion method, the photocatalytic degradation performance of common dyes and antibiotics is evaluated by simulating visible light photocatalysis, and the reaction mechanism of photocatalytic degradation of methylene blue with the best effect is researched. The photocatalytic reaction is effectively promoted by utilizing the catalytic effect of the spinel ferrite, so that environment-friendly pollutant degradation is realized. According to the method, the production process is simple, various organic toxic and harmful substances are not introduced, the method is nontoxic and harmless in the use process, the recovery efficiency of the catalyst exceeds 95%, and the method has the characteristics of remarkable degradation effect and no secondary pollution; the preparation method only relates to the processes of dissolving, calcining, crushing and the like, and is extremely suitable for industrial batch production.

A method of fertilizing a plant including applying a composition to a root of the plant. The composition includes a spinel ferrite with a formula of MnxZnyFe2O4, where x+y=1. Particles of the spinel ferrite are spherical and have an average diameter of 10-20 nm. The plant has at least a 40% increase in leaf size compared to a plant under the same conditions but without applying the composition.

The application discloses a kind of microspheroidal high-entropy spinel type ferrite wave-absorbing materials and preparation method thereof, belong to electromagnetic wave absorbing material technical field, the preparation method includes with the designed molar ratio six metal nitrate is weighed and dissolved in deionized water, then add ammonium fluoride, urea, after stirring, the obtained solution is hydrothermal reaction at a certain temperature for a certain time to obtain precursor, the precursor is calcined to obtain microspheroidal high-entropy spinel type ferrite.The obtained wave-absorbing material is single-phase spinel structure, micron-sized spherical morphology, its chemical formula is MFe2O4;Wherein M=Co, Ni, Cu, Zn, Cr.The microspheroidal high-entropy spinel type ferrite wave-absorbing material and preparation method thereof are used, and the performance of pure ferrite wave-absorbing material can be effectively improved, with the characteristics of simple preparation, strong absorption performance, absorption frequency bandwidth.

The application discloses a high-efficiency degradation of dyes and antibiotics high-entropy spinel ferrite catalyst and a preparation method and application thereof. 1 / 2 Zn 1 / 2 Fe 2 / 3Co 2 / 3 Ni 2 / 3 O4(HEO-FNCCZ) high-entropy spinel ferrite catalyst, the photocatalytic degradation performance of common dyes and antibiotics is evaluated by using simulated visible light photocatalysis, and the reaction mechanism of the photocatalytic degradation of methylene blue with the best effect is studied. The catalytic effect of the spinel ferrite is utilized to effectively promote the photocatalytic reaction, so that the environment-friendly pollutant degradation is realized. The method has the characteristics of simple production process, no introduction of various organic toxic and harmful substances, non-toxic and harmless in use, catalyst recovery efficiency more than 95%, and no secondary pollution. The preparation method only involves processes such as dissolving, calcining and crushing, and is extremely suitable for industrialized batch production.

The invention discloses a spinel ferrite polishing method, and belongs to the technical field of waveguide device materials, the method comprises the following steps: using a high hardness polyurethane polishing pad (A) to cooperate with white corundum for first round polishing; a low-hardness polishing pad (B) is matched with the polycrystalline diamond liquid for second-round polishing; the polishing method is used for solving the problems that after the spinel ferrite substrate is polished, the surface roughness is large, the surface quality is poor, orange peel exists, and the surface roughness is uneven, the production efficiency and the product consistency of the substrate are greatly improved, and the stability and the reliability of microwave devices are facilitated.

The invention relates to the technical field of ferrite single-crystal materials, in particular to a treatment method for improving the ferromagnetic resonance line width of spinel NiZn ferrite single-crystal pellets, which comprises the following steps: annealing the spinel NiZn ferrite single-crystal pellets under the conditions of high oxygen pressure and high temperature, slowly cooling to room temperature, and releasing the pressure after the annealing is finished, thereby obtaining the spinel NiZn ferrite single-crystal pellets. According to the method, the NiZn ferrite single crystal pellets are subjected to annealing treatment by adopting a high-oxygen-pressure high-temperature annealing treatment process, the pellet processing stress can be released under the condition of inhibiting Zn element volatilization, the ferromagnetic resonance line width of the NiZn ferrite single crystal pellets can be effectively reduced, and subsequent pellet surface polishing treatment is also facilitated.

Methods of forming spinel ferrite nanoparticles containing a chromium-substituted copper ferrite as well as properties (e.g. particle size, crystallite size, pore size, surface area) of these spinel ferrite nanoparticles are described. Methods of preventing or reducing microbe growth on a surface by applying these spinel ferrite nanoparticles onto the surface in the form of a suspension or an antimicrobial product are also described.

A magnetoelectric multiferroic nanocomposite. The nanocomposite comprises a ferroelectric perovskite oxide and a rare-earth substituted mixed ternary transition metal ferrite of the formula A1-xBxRyFe2-yO4. The nanocomposite has a high dielectric constant, low dielectric loss, both stable over a wide frequency range. These properties may make the nanocomposite desirable for applications in microelectronic devices, sensors and antennas.

A multilayer coil device includes a magnetic layer. The magnetic layer includes main phases and a grain boundary phase. The main phases include a spinel ferrite. The grain boundary phase includes a silicon oxide and a bismuth oxide. The main phases and the grain boundary phase have an area ratio of 92:8 to 99:1.

The invention belongs to the technical field of soft magnetic materials, and relates to high-performance iron-based magnetic core powder and a preparation method thereof. The high-performance iron-based magnetic core powder comprises an iron-based soft magnetic powder base material and an LDOs coating layer coating the surface of the base material. The composition of the LDOs coating layer is (MO) x (MeO) y (Fe2O3) z, wherein M is selected from one or more of Ca, Sr, Ba and Pb; and Me is selected from one or more of Mg, Zn, Cu, Ni, Co and Mn. The surface of the iron-based soft magnetic powder is coated with the LDOs layer composed of the layered magnetoplumbite ferrite and the layered spinel ferrite, the resistivity and the magnetic conductivity of the powder are effectively improved, the magnetic loss is remarkably reduced, meanwhile, the saturation magnetization is kept stable and even slightly improved, and the magnetic performance of the iron-based soft magnetic powder is improved. The defects of large magnetic loss and serious magnetic dilution phenomenon of iron-based magnetic core powder in the technical field of soft magnetic composite material processing at present are overcome.

The invention provides spinel type ferrite with ferromagnetic performance, a preparation method and application of the spinel type ferrite and a wave-absorbing material, and relates to the technical field of ferrite. The preparation method comprises the following steps: sequentially carrying out tabletting, quenching at 1400-1600 DEG C, cooling and heat treatment in a protective atmosphere on a metal oxide to obtain spinel type ferrite; and the metal oxide comprises FeO. The spinel type ferrite prepared by the invention shows relatively strong wave-absorbing property at the thickness of 1-5mm, the lowest reflection loss has reflection loss less than-10dB in different wave bands, the effective bandwidth of the prepared spinel type ferrite with ferromagnetic property basically exceeds 2.8 GHz, and when the spinel type ferrite with ferromagnetic property is compounded with other dielectric materials, the wave-absorbing property of the spinel type ferrite is greatly improved. The dielectric composite material can show stronger wave-absorbing performance, and the lowest reflection loss and the effective absorption bandwidth can be greatly improved according to the performance of the dielectric composite material; the spinel ferrite prepared by the invention has high saturation magnetization and meets the use requirements.

A nanocomposite electrode and supercapacitor thereof are disclosed. The nanocomposite electrode includes a substrate, at least one binding compound, at least one carbonaceous compound, and vanadium doped spinel ferrite nanoparticles (V-SFNPs). The V-SFNPs have a formula of CoxNi1-xVyFe2-yOz, wherein x=0.1-0.9, y=0.01-0.10, and z=3-5. The substrate is at least partially coated on a first side with a mixture comprising the V-SFNPs, the at least one binding compound, and the at least one carbonaceous compound. Two of the nanocomposite electrodes are combined to form the supercapacitor.

The present invention relates to a laminated coil component having excellent magnetic permeability and voltage resistance. The laminated coil component has a magnetic layer having a main phase comprising spinel ferrite and a grain boundary phase containing a silicon oxide and a bismuth oxide, the area ratio of the main phase to the grain boundary phase being 92: 8 to 99: 1.

The invention relates to preparation of a rehabilitation type magnetic material with high stability and strong magnetic conductivity. The preparation method comprises the following steps: preparation of a short-chain bisphthalonitrile monomer, preparation of a phthalocyanine ferromagnetic high polymer material, preparation of polyaniline, preparation of Mn-Zn spinel ferrite, preparation of polyion liquid microspheres, preparation of Fe-6. 5wt.% Si alloy (high silicon steel), preparation of copper-doped polydopamine (PDA) nanoparticles and the like. The magnetic material prepared by creatively combining preparation methods such as a vacuum melting method, a hydrothermal synthesis method and an emulsion polymerization method has the advantages of high magnetic conductivity, high stability, self-repairing property and the like, can be applied to multiple fields such as rehabilitation sensors, biomedical implant devices, targeted magnetic hyperthermia systems and the like, and has wide application prospects. The prepared magnetic material can automatically recover when being deformed or damaged under the action of external force, and a material basis with a stable structure and durability is provided for medical application.

A system for the synthesis of magnetoelectronically tunable spinel ferrite nanoparticles, comprising: a) a precursor preparation unit for the preparation of a homogeneous nitrate precursor solution, wherein the precursor preparation unit facilitates the dissolution of stoichiometric amounts of magnesium nitrate hexahydrate, nickel nitrate hexahydrate, iron(III) nitrate nonahydrate and chromium(III) nitrate nonahydrate in deionized water; b) a fuel mixing unit configured to introduce a binary mixture of urea and glucose into the dissolved homogeneous nitrate solution in a fuel-oxidant ratio that achieves fuel equivalence; c) a gel formation unit configured to maintain the temperature at 70-80 °C under continuous stirring to convert the fuel mixture into a viscous gel; d) a combustion unit comprising a preheated muffle furnace maintained at 450 ± 10 °C and enabling the initiation of a self-propagating combustion reaction; and e) a calcination plant configured for the thermal treatment of crushed precursor ash at 600 °C for 2 hours and subsequently at 750 °C for 2 hours to produce phase-pure cubic spinel Mg 1-x Ni x To produce FeCrO4 nanoparticles.

The present application relates to a kind of cobalt-based spinel ferrite nanoparticles with zero-field magnetic quantum tunneling properties and its application, the inside of the nanoparticle has the topological structure of broken spatial symmetry;The topological structure includes the first topological domain and the second topological domain distributed staggeredly in space, so that the cobalt-based spinel ferrite nanoparticle produces intrinsic transverse tunneling energy level splitting under zero applied magnetic field.The sharp stepwise magnetization jump of the cobalt-based spinel ferrite nanoparticle of the present application at zero field can realize the high sensitivity nonlinear response to weak magnetic field, and can be applied to the preparation and development of low-temperature quantum sensing probe or multi-level nonvolatile logic memory.

The invention discloses a screening method of a quaternary spinel ferrite type photocatalytic material. The method comprises the following steps: firstly, constructing a series of quaternary spinel ferrite models, then carrying out sufficient structural relaxation by utilizing a first principle, evaluating thermodynamic and dynamic stability of the models through formation energy and calculation of a phonon spectrum, and further calculating an energy band structure, a band edge position, electron effective mass and hole effective mass of the models; the influence of different tetrahedron center atoms on the electronic structure of the spinel type material is analyzed and compared, and the quaternary spinel type material suitable for being used in the photocatalysis field is screened out according to the requirement of an ideal photocatalysis material on the electronic structure of the material.

The present invention is a spherical Ni-based spinel ferrite powder having a circularity coefficient of 0.75 to 1.00, an average particle diameter D50 of 0.1 [mu] m to 200 [mu] m, and a dielectric constant of 1 to 13 at 50 MHz when 60 vol% of the ferrite powder is kneaded with a resin.

The invention discloses a method for screening a spinel type ferrite AFe2O4 / two-dimensional material heterojunction photocatalytic material, which comprises the following steps of: constructing a series of spinel type ferrite AFe2O4 / two-dimensional material heterojunction structure models, then carrying out sufficient structure optimization to obtain a ground state heterojunction structure, and calculating the adsorption energy of a two-dimensional material and a matrix, so as to obtain the spinel type ferrite AFe2O4 / two-dimensional material heterojunction photocatalytic material. The method comprises the following steps of: performing de novo molecular dynamics simulation to evaluate the stability, further calculating the differential charge density, the energy band structure and the band edge position, screening, analyzing and comparing the influence of different two-dimensional materials on the electronic structure of the spinel type material, and screening out a spinel type ferrite / two-dimensional material heterojunction structure model suitable for the photocatalysis field.

The invention provides a method for producing a ferrite presintered body and a ferrite sintered magnet. The ferrite presintered body has a ferrite phase and a spinel ferrite phase, the ferrite phase contains metal elements of Ca, R, A, Fe and Co (R is at least one rare earth element, La is an essential element, and A is Sr and / or Ba), the ferrite presintered body has a hexagonal M-type magnetite structure, the composition ratios of Ca, R, A, Fe and Co are 2.0-6.5 at%, 2.0-6.5 at%, 0-2 at%, 83-92 at% and 1.5-6.5 at%, and the spinel ferrite phase contains Ca, Fe, Co and Mn, when the total amount of Ca, Fe, Co, and Mn is 100 at%, the composition ratios of Ca, Fe, Co, and Mn are greater than 0 at% and 10 at% or less, 80-90 at%, 2-15 at%, and greater than 0 at% and 5 at% or less, and the ferrite presintered body contains 70 mass% or more and less than 100 mass% of a ferrite phase and 10-20 mass% of a spinel-type ferrite phase.

The invention discloses a spinel ferrite photocatalytic material screening method based on synergic regulation and control of reversal degrees and A-site cations. The method comprises the following steps: firstly, constructing AFe2O4 type spinel ferrite structure models of different A-site cations and [AxFe1-x] [Fe2-yAy] O4 type spinel ferrite structure models of different reversal degrees; then, the formation energy and phonon spectrum of each model are calculated by adopting a first principle, and unstable models are removed; the electron energy band structure, the carrier effective mass and the light absorption coefficient of the reserved thermodynamically and dynamically stable model are further calculated with high precision, and the model meeting the requirements of the ideal photocatalytic material electron structure and the light absorption coefficient is reserved; and then calculating the carrier mobility based on a deformation potential theory, calculating the service life of the optical excitation carrier by using a non-adiabatic molecular dynamics method, and preferably selecting a model with high mobility and long service life of the carrier as a potential photocatalytic material.

A nanocomposite electrode and supercapacitor thereof are disclosed. The nanocomposite electrode includes a substrate, at least one binding compound, at least one carbonaceous compound, and vanadium doped spinel ferrite nanoparticles (V-SFNPs). The V-SFNPs have a formula of CoxNi1-xVyFe2-yOz, wherein x=0.1-0.9, y=0.01-0.10, and z=3-5. The substrate is at least partially coated on a first side with a mixture comprising the V-SFNPs, the at least one binding compound, and the at least one carbonaceous compound. Two of the nanocomposite electrodes are combined to form the supercapacitor.

A magnetoelectric multiferroic nanocomposite. The nanocomposite comprises a ferroelectric perovskite oxide and a rare-earth substituted mixed ternary transition metal ferrite of the formula A1-xBxRyFe2-yO4. The nanocomposite has a high dielectric constant, low dielectric loss, both stable over a wide frequency range. These properties may make the nanocomposite desirable for applications in microelectronic devices, sensors and antennas.

The invention discloses a high-performance spinel gyromagnetic ferrite material and a preparation method thereof, and belongs to the technical field of magnetic composite materials. The preparation method comprises the following steps: mixing NiO, SnO2, Ho2O3, Co2O3, CuO, ZnO, MnCO3, Al2O3 and Fe2O3 according to a certain proportion by adopting a solid-phase reaction method, and carrying out ball milling, drying, pre-sintering, secondary ball milling, granulation, sieving and blank making to obtain the ferrite material. The material has high spin wave line width, low resonance line width and good mechanical strength. When the broadband microwave circulator is applied, the requirement problem of a broadband high-power miniaturized circulator can be solved, meanwhile, the used raw materials are low in price, and the broadband microwave circulator has very high economic value.

A magnetoelectric nanocomposite (MEN) is described. The MEN are used as a colorectal cancer treatment. The MEN includes a shell having at least one ferroelectric compound and a rare earth (R) metal doped spinel ferrite nanoparticle (SFNP) core, of a formula of CoxMn1-xR2-yFeyOz wherein x=0.1-0.9, y=1.90-1.99, and z=3-5; and R is at least one rare earth metal selected from the group consisting of cerium (Ce), europium (Eu), gadolinium (Gd), terbium (Tb) and thulium (Tm). A method of making MENs is also provided.

A nanocomposite electrode and supercapacitor thereof are disclosed. The nanocomposite electrode includes a substrate, at least one binding compound, at least one carbonaceous compound, and vanadium doped spinel ferrite nanoparticles (V-SFNPs). The V-SFNPs have a formula of CoxNi1-xVyFe2-yOz, wherein x=0.1-0.9, y=0.01-0.10, and z=3-5. The substrate is at least partially coated on a first side with a mixture comprising the V-SFNPs, the at least one binding compound, and the at least one carbonaceous compound. Two of the nanocomposite electrodes are combined to form the supercapacitor.

Methods of forming spinel ferrite nanoparticles containing a chromium-substituted copper ferrite as well as properties (e.g. particle size, crystallite size, pore size, surface area) of these spinel ferrite nanoparticles are described. Methods of preventing or reducing microbe growth on a surface by applying these spinel ferrite nanoparticles onto the surface in the form of a suspension or an antimicrobial product are also described.

An electrocatalyst including a substrate and CoxNiyFe2O4 nanoparticles, where x+y=1. The CoxNiyFe2O4 nanoparticles are doped with 0.01 weight percentage (wt. %) to 1.0 wt. % selenium (Se), based on the total weight of the CoxNiyFe2O4 nanoparticles. Further, the CoxNiyFe2O4 nanoparticles have a polygonal shape, and the CoxNiyFe2O4 nanoparticles are dispersed on the substrate to form the electrocatalyst.

The application belongs to the technical field of soft magnetic materials, and relates to a high-performance iron-based magnetic core powder and a preparation method thereof. The high-performance iron-based magnetic core powder comprises an iron-based soft magnetic powder base material and an LDOs coating layer coated on the surface of the base material; the composition of the LDOs coating layer is (MO) x (MeO) y (Fe2O3) z wherein M is selected from one or more of Ca, Sr, Ba and Pb; and Me is selected from one or more of Mg, Zn, Cu, Ni, Co and Mn. The application coats the surface of the iron-based soft magnetic powder with an LDOs layer composed of two phases of layered magnetoplumbite ferrite and layered spinel ferrite, effectively improves the resistivity and magnetic permeability of the powder, significantly reduces the magnetic loss, and keeps the saturation magnetization stable or even slightly improves the saturation magnetization, thereby filling the defects of large magnetic loss and serious magnetic dilution of the iron-based magnetic core powder in the current soft magnetic composite material processing technology field.