89 results about "High saturation magnetization" patented technology

The invention discloses a low ferromagnetic resonance linewidth BaFe12O19 single crystal and a preparation method thereof, and belongs to the technical field of magnet materials. According to the method, growth of the BaFe12O19 single crystal is realized mainly through multiple times of temperature rising and falling and multiple times of temperature oscillation. Compared with direct cooling, the single crystal grown by the method provided by the invention has higher Curie temperature and saturation magnetization and narrower ferromagnetic resonance line width. Through collaborative optimization of high Curie temperature, high saturation magnetization and low ferromagnetic resonance line width, the BaFe12O19 single crystal can be better applied to the frontier fields of high-frequency electronic devices, high-temperature permanent magnet systems, quantum technologies and the like. The improvement of the performance of the device can promote the development of the device in the directions of high frequency, miniaturization and high energy efficiency, and has strategic significance for new-generation communication, energy and information technologies.

The present invention provides an iron-based nanocrystalline soft magnetic alloy powder, a soft magnetic composite material and a preparation method thereof, belonging to the technical field of soft magnetic materials. The iron-based nanocrystalline soft magnetic alloy powder has a heterogeneous nanocrystalline structure comprising a three-dimensional island-shaped amorphous region and a nanocrystalline region. The diameter of the three-dimensional island-shaped amorphous region is 50-100 nm, and the number density of the three-dimensional island-shaped amorphous region is 10 19 ‑10 20 m ‑3 The iron-based nanocrystalline soft magnetic alloy powder has the advantages of high sphericity, high saturation magnetization and low coercive force; the soft magnetic composite material comprises soft magnetic powder and a coating layer coated on the surface of the soft magnetic powder, and the coating layer comprises a binder, wherein the soft magnetic powder is the iron-based nanocrystalline soft magnetic alloy powder provided by the present invention, or is composited with at least one of iron-nickel, iron-nickel-molybdenum, iron-silicon, iron-silicon-aluminum, iron-silicon-chromium, carbonyl iron and pure iron powder, and has the advantages of low high-frequency loss, high magnetic permeability and high DC bias.

The invention provides amorphous nanocrystalline soft magnetic alloy powder, a preparation method thereof and a magnetic powder core, and relates to the technical field of soft magnetic materials. According to the preparation method of the amorphous nanocrystalline soft magnetic alloy powder, a high-energy electric pulse technology is adopted, an amorphous alloy material is instantly and rapidly heated and exploded, the particle size of the powder is accurately regulated and controlled by accurately regulating and controlling an energy input parameter and a spacing parameter, and the high-sphericity soft magnetic powder with the median particle size being 0.5-5 microns is prepared; the uniformity and dispersity of the powder are remarkably improved, and the problem of low particle size control precision in the prior art is solved. The preparation method is simple in technological process and low in energy consumption, impurities and defects introduced in a traditional multi-step technology are avoided, and the purity and performance of the material are improved. The prepared amorphous nanocrystalline soft magnetic alloy powder has the characteristics of small particle size, high sphericity, high saturation magnetization, low coercive force and high yield, and is particularly suitable for the fields of high-frequency magnetic elements and precision electronic devices.

The invention discloses a preparation method of a multi-hard-phase soft-hard nano composite rare earth permanent magnet material, and relates to the technical field of rare earth permanent magnet materials. The multi-hard-phase soft and hard nano composite rare earth permanent magnet material with the chemical formula of Sm (Co < 1-x > Fe < x >) < y > is prepared, x ranges from 0.36 to 0.43, and y ranges from 6.1 to 7. Elementary substances Sm, Co and Fe in a specific proportion are smelted to form master alloy ingot casting coarse powder, high-energy ball milling is carried out, a completely amorphous precursor without FeCo nanocrystals is obtained, in-situ uniform precipitation growth of a FeCo soft phase and multiple SmCo phase fine crystals such as SmCo7 and SmCo5 is induced through subsequent heat treatment, and therefore the saturation magnetization and coercive force of the composite rare earth permanent magnet material are cooperatively improved, and the composite rare earth permanent magnet material has the advantages of being simple in preparation process, low in cost and high in efficiency. The technical problem that a traditional permanent magnet material cannot give consideration to high saturation magnetization intensity and coercive force is solved.

The application relates to a preparation method of a high-dielectric high-Curie-temperature garnet ferrite without rare earth, which comprises the following steps: pre-treating raw materials to make the raw materials with different particle sizes basically reach the same particle size state, and then obtaining mixed materials with uniform components through mechanical stirring and one-time granulation, so that ideal pre-sintering effect can be realized. Meanwhile, three kinds of second grinding materials with different pre-sintering temperatures and particle sizes are uniformly mixed to control the sintering activity of the powder, and the sintering process is matched, so that the microstructure of the sintered body can be finally improved, the porosity of the ferrite material is reduced, and the ferromagnetic resonance line width is reduced. Through the combined substitution of bismuth, zirconium and calcium elements and the adjustment of the preparation process, the particle size of the powder is adjusted, the sintering stage is controlled to the end of continuous grain growth, the microstructure of the garnet ferrite material is improved, and finally the ferrite material with high dielectric constant, high saturation magnetization, low ferromagnetic resonance line width and high Curie temperature is prepared.

The application belongs to the technical field of ferrite material preparation, and particularly provides a modified self-biased hexagonal gyromagnetic ferrite material and a preparation method thereof. The modified self-biased hexagonal gyromagnetic ferrite material comprises a main component and an additive. The main component comprises 74.5 mol% to 82.8 mol% of Fe2O3, 1.3 mol% to 6.1 mol% of Cr2O3, and the rest of BaCO3. Taking the weight of the main component after pre-sintering as a calculation basis, the additive comprises 0.5 wt% to 2.0 wt% of CaCO3, 0.5 wt% to 2.0 wt% of SiO2, and 0.1 wt% to 2.0 wt% of Bi2O3. The modified self-biased hexagonal gyromagnetic ferrite material (BaM) prepared through a sintering process optimization has the characteristics of high saturation magnetization (4πM s : 3.9~4.2kGs), high remanence ratio (M r / M s : 0.6~0.8), coercivity (H c : 450~550Oe), and low ferromagnetic resonance line width (ΔH: 230~280Oe), and meets the engineering requirements of microwave devices.

The invention relates to the field of metallurgy, in particular to amorphous soft magnetic alloys based on Fe-Co, obtained by casting the melt onto the surface of the crystallizer and its high-speed quenching, which are used as an integral part of various devices, in particular transformers, motors, generators - devices whose characteristics are based on the effect of electromagnetic induction. The technical result of the proposed invention is to obtain an extremely high value of saturation magnetization of 1.94-2.01 T, while the coercive force is 6.6-10 A / m, the maximum permeability is 5000 ~ 14000. The present invention has the advantages of a simple heat treatment mode and a low annealing temperature, which significantly reduces the cost of the process. The technical result is achieved as follows: a soft magnetic material based on iron and cobalt, containing boron, silicon, phosphorus and carbon in the following ratio of components in at. %: Fe – 58.2 – 68.0; Со – 16.4 – 25.2; B – 13 – 16; Si – 0.9 – 1.1; P – 0 – 1.1; C – 0 – 1.1.

A Sm—Fe—N-based magnetic material in which the use amount of Sm is further reduced while enhancing the saturation magnetization, and a production method thereof, are provided. The present disclosure discloses a Sm—Fe—N-based magnetic material including a main phase having a crystal structure of at least either Th2Zn17 type or Th2Ni17 type, wherein the main phase is represented by the molar ratio formula (Sm(1-x-y-z)LaxCeyR1z)2(Fe(1-p-q-s)CopNiqMs)17Nh, where R1 is one or more rare earth elements other than Sm, La and Ce, and Zr, and M is one or more elements other than Fe, Co, Ni and rare earth elements, and an unavoidable impurity element, and 0.09≤x≤0.31, 0.24≤y≤0.60, 0.51≤x+y≤0.75, 0≤z≤0.10, 0≤p+q≤0.10, 0≤s≤0.10, and 2.9≤h≤3.1 are satisfied, and a production method thereof.

The present invention provides hexagonal ferrite magnetic powder which is extremely useful in achieving both an increase in recording density and an increase in SNR of a magnetic recording medium, is crystalline and has a high saturation magnetization. The hexagonal ferrite magnetic powder contains Bi in a range of a Bi / Fe molar ratio of 0.035 or less, has a saturation magnetization σs of 42.0 Am 2 / kg or more, and a Dx volume of 1800 nm 3 or less, based on a microcrystal diameter. The magnetic powder can be produced by a method for producing hexagonal ferrite magnetic powder, comprising a process of immersing hexagonal ferrite magnetic powder containing Bi in a solution in which a compound X that forms a complex with Bi is dissolved, thereby performing a treatment of dissolving a part of the Bi present in the hexagonal ferrite magnetic powder into the solution.

The application provides a magnetic tunnel junction device, comprising: a reference layer, a barrier layer, a free layer and a cap layer which are stacked, the reference layer has a fixed magnetization which is substantially perpendicular to the plane of the reference layer, the free layer has a magnetization which is substantially perpendicular to the plane of the free layer and can be switched between parallel or anti-parallel to the magnetization direction of the reference layer, the free layer comprises a first ferromagnetic layer and a second ferromagnetic layer which are stacked, the first ferromagnetic layer is arranged adjacent to the barrier layer and has a high saturation magnetization. The application can reduce the switching current of the magnetic tunnel junction device.

The invention discloses an Sm-Fe-N based magnetic material and a method for manufacturing the same. Provided are: an Sm-Fe-N-based magnetic material which has improved saturation magnetization compared to conventional magnetic materials and in which the amount of Sm used is further reduced; and a method for producing the Sm-Fe-N-based magnetic material. This Sm-Fe-N-based magnetic material is provided with a main phase having a crystal structure of at least one of the Th2Zn17 type and the Th2Ni17 type, the main phase being represented by the molar ratio formula (Sm (1-x-y-z) LaxCeyR1z) 2 (Fe (1-p-q-s) CopNiqMs) 17Nh, in the formula, R1 is one or more rare earth elements other than Sm, La and Ce and Zr, and R2 is one or more rare earth elements other than Sm, La and Ce; m is one or more elements other than Fe, Co, Ni and rare earth elements and unavoidable impurity elements, and 0.09 < = x < = 0.31, 0.24 < = y < = 0.60, 0.51 < = x + y < = 0.75, 0 < = z < = 0.10, 0 < = p + q < = 0.10, 0 < = s < = 0.10, and 2.9 < = h < = 3.1 are satisfied.

This invention discloses a method for preparing highly stable gyromagnetic ferrites, belonging to the field of magnetic material preparation technology. The method includes formulation preparation, multi-stage sand milling and granulation, molding and sintering, composite structure preparation, and precision machining steps. The formulation consists of VIII-series, IIIB-series, lanthanide-series, IVB-series, and VIIB-series metal oxides in a specific molar ratio, with rare earth nano-additives added to enhance lattice stability. Uniform slurry particle size is achieved through two-stage sand milling and spray granulation. A curved sintering process is used to control the temperature rise and oxygen content to obtain a high-density green body. A yttrium iron garnet or dysprosium iron garnet functional layer is formed on the surface of the green body by magnetron sputtering, constructing a multi-layer composite structure. Finally, a conductive modification layer is formed on the surface through integrated laser cutting and chemical mechanical polishing. The gyromagnetic ferrite material prepared by this method exhibits high saturation magnetization, low high-frequency loss, and excellent thermal stability, making it suitable for 5G communication, radar, and high-frequency microwave devices.

The application discloses a kind of dual-phase soft magnetic high-entropy alloy and preparation method thereof.The high-entropy alloy is composed of iron (Fe), cobalt (Co), chromium (Cr) and vanadium (V), with face-centered cubic (FCC) and body-centered cubic (BCC) dual-phase structure.The preparation method includes the following steps: design of dual-phase high-entropy alloy; preparation of alloy; homogenization treatment; controlled cold rolling; two-stage isothermal treatment.Based on the above process, the prepared high-entropy alloy has FCC and BCC dual-phase, FCC phase rich in Co, Cr and V, and BCC rich in Fe.Two-phase layered lamellar phase alternately forms pearlite-like structure.The dual-phase soft magnetic high-entropy alloy has high saturation magnetization (50-200 emu / g), low coercivity (50-100 Oe), high tensile yield strength (800-2000 MPa) and moderate plasticity (10-30%), and the mechanical and magnetic properties of the high-entropy alloy can be further adjusted by adjusting the heat treatment conditions.The method is simple and easy to operate, and can be widely applied to the preparation of various high-entropy alloys, with wide application prospect.

The invention relates to the technical field of amorphous alloy, in particular to a Fe-based amorphous alloy strip and a preparation method and application thereof, and the Fe-based amorphous alloy strip comprises the following elements of, by atomic percent, 75%-85% of Fe, 0.5%-4% of Si, 5%-12% of B, 0.1%-4% of P, 0.1%-4% of C, 0.5%-6% of Mo and 0.5%-5% of Ni. The sum of the atomic percentage contents of Fe, Si, B, P, C, Mo and Ni is 100%. According to the invention, the molybdenum element and the nickel element are introduced, so that the Fe-based amorphous alloy strip has high saturation magnetization, and meanwhile, the wear resistance and the toughness are remarkably improved.

This invention belongs to the field of metallic materials technology, and particularly relates to an Fe-Nb-B-Y amorphous alloy, its preparation method, and its applications. The alloy has the following atomic percentage expression: (Fe 85 B 14.7 Nb 0.3 ) 100‑x Y x Where 0.2≤x≤0.3. This Fe-Nb-B-Y amorphous alloy maintains high glass-forming ability while also possessing low coercivity and high saturation magnetization.

The invention discloses carbon-coated iron-cobalt nanoparticles with high saturation magnetization and low coercive force as well as a preparation method and application of the carbon-coated iron-cobalt nanoparticles. The preparation method comprises the following steps: mixing ferric nitrate and / or ferrous nitrate, cobalt salt, 2-methylimidazole and a solvent, stirring, and spin-drying to obtain an iron-cobalt bimetallic complex precursor; the molar ratio of ferric nitrate and / or ferrous nitrate to cobalt salt is (1-3): (1-2); the molar ratio of ferric nitrate and / or ferrous nitrate to 2-methylimidazole is 1: (1-25); and pyrolyzing the iron-cobalt bimetallic complex precursor in inert gas at 850-950 DEG C to obtain the carbon-coated iron-cobalt nanoparticles with high saturation magnetization and low coercive force. The method is mild in condition, simple in process and easy for large-scale production, and the graphitized carbon layer of the material can isolate oxygen and a corrosive medium and maintain high Ms of the iron-cobalt core; the electron coupling effect of the carbon shell and the iron-cobalt interface can reduce lattice distortion, inhibit magnetic domain wall pinning and reduce coercive force.

The invention discloses a two-dimensional Van der Waals ferromagnetic quantum material with high Curie temperature and a preparation method and application thereof, the quantum material is of a two-dimensional nanosheet crystal structure and belongs to a layered Van der Waals material, and the chemical formula of the quantum material is InFeTe3; the two-dimensional InFeTe3 crystal has a hexagonal structure, and the lattice constant # imgabs0 # # imgabs1 # belongs to a trigonal system and a P3m1 space group; the method comprises the following steps: mixing In, Fe and Te elementary substances, pre-crystallizing to obtain an InFeTe metal block, and sublimating, transferring and crystallizing the metal block under vacuum sealing by adopting a double-temperature-zone tubular furnace to obtain millimeter-level InFeTe3 crystals with silver metal luster; stripping and transferring the InFeTe3 crystal, and then annealing the InFeTe3 crystal in inert gas to obtain a few-layer two-dimensional InFeTe3 crystal; the preparation method disclosed by the invention has the characteristics of simplicity, low energy consumption and high repeatability, and the two-dimensional InFeTe3 crystal prepared by the preparation method disclosed by the invention has the characteristics of high saturation magnetization and high Curie temperature, and can be applied to spin electronic devices and quantum devices.

The invention discloses a metal-doped magnetic algae-based composite material as well as a preparation method and application thereof, and belongs to the technical field of composite material preparation. The preparation method comprises the following steps: crushing an algae biomass raw material to obtain pretreated algae slurry; the preparation method comprises the following steps: dissolving soluble trivalent ferric salt, soluble divalent ferrous salt and metal salt Mn < + > in water to prepare a mixed metal salt solution; adding the pretreated algae slurry into a mixed metal salt solution, under a stirring state, adjusting the pH value of a mixed system to be alkaline, carrying out a heating reaction, and after the reaction is finished, carrying out solid-liquid separation and washing to obtain a metal-doped magnetic algae-based precursor; and placing the metal-doped magnetic algae-based precursor in a high-temperature furnace under the protection of an inert atmosphere, carrying out heating treatment, and after pyrolysis is finished, cooling to room temperature to obtain the metal-doped magnetic algae-based composite material. The metal-doped magnetic algae-based composite material has high saturation magnetization, and can realize efficient adsorption of heavy metal ions and organic pollutants when being applied to wastewater treatment.

The present invention relates to a magnetic fish scale-based biochar and a preparation method thereof, as well as its application in degrading antibiotic wastewater. Cheap discarded fish scales are used as raw materials, which are modified by decalcification, crushing, and activation using an activator transition metal acetate. After freeze-drying, the pore structure is optimized by high-temperature pyrolysis to form a multi-activation site catalyst with surface-loaded bimetallic nanoparticles. The rapid electron transfer effect between carbon and transition metals is utilized to produce a large amount of active substances, thereby obtaining magnetic fish scale-based biochar with a high specific surface area and high saturation magnetization. The preparation method has simple and easy steps, low raw material cost, short production cycle, easy control of production process conditions, conventional equipment required, strong practicality and operability, and can be promoted and applied in large-scale industry. The application of the modified magnetic fish scale-based biochar in the treatment of antibiotic wastewater can effectively remove antibiotics in water and reduce the toxicity of wastewater.

The present invention relates to a magnetic TPE material and a preparation method thereof, belonging to the field of magnetic composite materials. The present invention discloses a magnetic TPE material and a preparation method thereof, wherein the weight components include 10-15 parts of hydrogenated styrene-butylene thermoplastic elastomer, 40-60 parts of active magnetic powder, 5-10 parts of polyolefin resin, 5-10 parts of polypropylene resin, 2-5 parts of compatibilizer, 10-25 parts of white oil, 0.1-0.5 parts of lubricant and 0.1-0.5 parts of antioxidant. The magnetic TPE material of the present invention adopts micro-nano lamination and low extrusion temperature preparation process. It can be used for injection molding or extrusion to make magnetic materials of different shapes, such as magnetic absorption nano data cables, charging cables, magnetic absorption panels, etc.; this product can obtain higher saturation magnetization while maintaining a good appearance, so that the product can maintain stable magnetic properties for a long time under different environments.

The invention discloses a high-entropy alloy modified fiber, a composite material and a preparation method thereof, and belongs to the technical field of protection. The high-entropy alloy modified fiber comprises carbon fiber and nano-particles which are physically pinned on the surface of the carbon fiber in a semi-embedded state; the nanoparticle comprises a metastable state high-entropy alloy core with high saturation magnetization, a dense dielectric oxide middle layer and a carbon shell. The ultra-fast Joule thermal shock technology is adopted to form a gradient sandwich core-shell structure of a metastable state alloy core, a compact oxide middle layer and a few-layer defect state carbon shell. The high-entropy alloy / fiber reinforced multifunctional composite material has a multi-stage interface structure, comprises a macroscopic fiber / matrix interface, a mesoscopic particle / fiber pinning interface and a microscopic particle internal core-shell interface, and is suitable for multifunctional integrated protection scenes such as electromagnetic stealth, severe environment corrosion resistance and impact and explosion resistance.

The invention relates to an amorphous magnetic material and a preparation method and application thereof.The preparation method comprises the steps that MoO3 powder is prepared through a hydrothermal method, the magnetic MoO3 powder with the magnetic induction intensity being 50-100 mT is obtained after magnetizing, the hydrothermal reaction temperature is 130-170 DEG C, the hydrothermal reaction time is 4-6 h, and then the MoO3 powder with the magnetic induction intensity being 50-100 mT is obtained; after the hydrothermal reaction is finished, cooling to 45-55 DEG C at a cooling speed of 15-25 DEG C / h at an equal temperature gradient, and washing and drying; the carbon powder and the iron-cobalt alloy powder are mixed and then calcined for 1-3 h at the temperature of 600-800 DEG C in the inert atmosphere, auxiliary alloy powder is obtained, and the mass ratio of the carbon powder to the iron-cobalt alloy powder is smaller than or equal to 1: 10; the auxiliary alloy powder obtained at at least two different calcination temperatures and / or different calcination time is mixed with the magnetic MoO3 powder, the amorphous magnetic material is obtained, and the ratio of the total mass of the auxiliary alloy powder to the mass of the magnetic MoO3 powder is smaller than or equal to 1: 2. The amorphous magnetic material obtained by the preparation method disclosed by the invention has higher saturation magnetization intensity and lower coercive force, and has higher stability and flexibility during application.

The invention discloses a multi-component alloy with high mechanical property and soft magnetic property and a preparation method of the multi-component alloy, an alloy matrix is of an FCC or BCC solid solution structure, a small amount of intermetallic compounds are introduced after Gd and Al are alloyed, the alloy is composed of Fe, Co, Ni, Gd and Al, and according to atomic percent, Fe accounts for 38-50%, Co accounts for 28-50%, Ni accounts for 5-30%, Gd accounts for 0-0.05%, and Al accounts for 0-5%. Fe, Co and Ni are combined according to a proper proportion to serve as an alloy matrix, Gd, Al and other elements are introduced into the matrix alloy, a uniform organization structure with the moderate grain size is obtained through a proper heat treatment technology and a proper plastic processing system, and therefore excellent plasticity and mechanical strength are obtained while high saturation magnetization intensity and low coercive force are guaranteed; the material can be used as a soft magnetic material in the fields of power industry and electronic equipment.

The application belongs to the field of soft magnetic high-entropy alloy material and magnetron sputtering technology, and particularly relates to a high-entropy alloy and nitride multilayer soft magnetic film for high frequency and a preparation method. The high-entropy alloy soft magnetic film layer comprises Zr and / or B, Fe, Co and Ni elements; the high-entropy alloy soft magnetic nitride film layer comprises Zr and / or B, Fe, Co, Ni and N elements, the N element is nitrogen gas with a certain partial pressure introduced in the magnetron sputtering process and nitrogen atoms are deposited into the high-entropy alloy soft magnetic nitride film layer, pure Ar and argon / nitrogen mixed gas are alternately used, the high-entropy alloy soft magnetic film layer and the high-entropy alloy soft magnetic nitride film layer are alternately sputtered on the surface of the substrate to obtain the multilayer soft magnetic film, the high-entropy alloy nitride soft magnetic film has high resistivity and low coercivity, the high-entropy alloy soft magnetic film has high saturation magnetization, the multilayer soft magnetic film has higher saturation magnetization and resistivity, and is suitable for high frequency application.

This invention discloses an iron-based amorphous nanocrystalline nanoparticle and its pressed magnetic core, preparation method, and application, belonging to the field of soft magnetic materials technology. The preparation method includes: target material preparation, using an induction melting furnace to prepare a master alloy ingot, and then machining it into the desired alloy target material using wire cutting; atomic fabrication of nanoparticles, using laser inert gas condensation technology to prepare iron-based amorphous nanocrystalline nanoparticle powder; and pressing molding, with a minimum molding pressure of less than 0.1 GPa. The iron-based amorphous nanocrystalline nanoparticle magnetic core of this invention has the following advantages: extremely low high-frequency loss, P cv (0.05 T, 100 kHz)=78‑94 mW / cm 3 , P cv (0.01 T, 1 MHz)=11‑53 mW / cm 3 It has a loss value far lower than that of traditional amorphous and nanocrystalline magnetic powder cores under the same conditions; and a high saturation magnetization intensity, which can reach 160-188 emu / g.

The invention discloses a high-saturation magnetization copper-iron alloy material and a preparation method and application thereof, and belongs to the technical field of copper-iron alloys. The invention relates to a copper-iron alloy material with high saturation magnetization, which comprises the following components in percentage by weight: 15-30% of Fe and the balance of Cu and inevitable impurities. According to the preparation method, an equal-channel angular pressing (ECAP) preprocessing and multi-stage variable-temperature rotary swaging synergistic composite machining system is adopted, and the alloy strength, the electric conductivity and the saturation magnetization are synchronously improved within short-time machining. The saturation magnetization of the prepared Cu-Fe alloy can reach 70 emu / g or above, meanwhile, the Cu-Fe alloy has good strength and conductivity, the experimental scheme is simple and easy to operate, the sizes of power electronic components can be effectively reduced through the advantages, the stability of the power electronic components in the working process is improved, and the development requirement of the power and electrical industry is met.

To achieve both a high saturation magnetization Ms and a low coercivity Hc in an iron-based amorphous alloy. An iron-based amorphous alloy is an iron-based amorphous alloy represented by a composition formula FeaSibBcPdCe, the composition ratio a satisfying 76.0≤a≤80.0, the composition ratio b satisfying 3.0≤b≤6.9, the composition ratio c satisfying 9.9≤c≤14.0, the composition ratio d satisfying 0.8≤d≤4.6, the composition ratio e satisfying 1.0≤e≤4.1.

The invention belongs to the technical field of ferromagnetic semiconductor materials, and discloses a fused ring imide room temperature organic ferromagnetic semiconductor film and a preparation method thereof. The method comprises the following steps: depositing a condensed ring imide compound to prepare a thin film, and then performing vapor phase reduction to obtain the condensed ring imide room-temperature organic ferromagnetic semiconductor thin film, the condensed ring imide compound has a structure as shown in a formula III. The method is simple, and the prepared film has high saturation magnetization, high Curie temperature and excellent electrical properties, and is an organic ferromagnetic semiconductor film. # imgabs0 #

The invention provides a composite flocculant as well as a preparation method and application thereof, the composite flocculant is a ceramsite-based composite material comprising a magnetic Fe3O4 inner core, an aluminum salt middle layer and a rare earth outer layer, and rare earth is lanthanide. The magnetic Fe3O4 core in the composite flocculant disclosed by the invention has high saturation magnetization intensity, so that rapid separation of the flocculant and water can be realized; meanwhile, Fe3O4 can prevent competitive ions such as Cl <-> and SO4 <-> in a water phase from eroding aluminum salt and rare earth lanthanum, and dissolution of active components is reduced; the aluminum salt middle layer promotes flocculation, lanthanum ions (La < + >) in the lanthanide outer layer react with phosphate radicals (PO4 <->) to generate LaPO4 precipitates to improve the phosphorus removal effect, pollutants in water are efficiently removed through the synergistic effect of all the components, and the water quality is remarkably improved.

The invention provides a hollow PtAgS nanocrystalline material as well as a preparation method and application thereof, and belongs to the technical field of synthesis of nano materials. A simple two-step hydrothermal method is adopted, firstly, a gel precursor is synthesized to serve as a self-sacrifice template, then a platinum source, a silver source, a sulfur source and the template are subjected to a hydrothermal reaction together, and the hollow PtAgS nanocrystal is obtained. According to the preparation method disclosed by the invention, platinum and silver atoms are induced to diffuse outwards from a sulfur-containing core by utilizing twin crystal defects formed in the initial stage of reaction, so that a hollow structure is formed; the process is simple and efficient, the product is pure, the structure is uniform and controllable, and the prepared hollow PtAgS nanocrystal is a ternary alloy nanocrystal with a uniform hollow structure, has twin crystal defects, shows excellent soft magnetic properties including high saturation magnetization and low coercive force, is particularly suitable for high-frequency and low-loss magnetic devices, and has wide application prospects. Such as miniaturized electronic components and magnetic sensors, and has a wide industrial application prospect.