128 results about "Dysprosium" patented technology

The invention discloses a method for improving performance of rare earth permanent magnet sintered neodymium iron boron grain boundary diffusion, and belongs to the technical field of rare earth permanent magnet materials. The method comprises the steps that a low-melting-point metal layer and a diffusion layer containing heavy rare earth elements are sequentially formed on the surface of a clean sintered neodymium-iron-boron magnet, and then vacuum diffusion heat treatment and tempering treatment are conducted. Wherein the low-melting-point metal layer comprises at least one of copper, aluminum, gallium and tin or an alloy of the copper, the aluminum, the gallium and the tin; the heavy rare earth element comprises at least one of dysprosium, terbium, holmium and gadolinium. The low-melting-point metal layer is preferentially diffused and wets the grain boundary in the heat treatment process, heavy rare earth elements are promoted to be deeply and uniformly diffused towards the interior of the magnet along the grain boundary, so that a heavy rare earth-rich shell layer is formed outside main phase grains of the magnet, and the intrinsic coercive force is improved; meanwhile, the low-melting-point metal forms a strengthening phase at the grain boundary, the brittleness of the magnet after diffusion is improved, the surface corrosion phenomenon is restrained, and collaborative optimization of the comprehensive performance of the magnet is achieved.

The invention discloses a neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and a preparation method thereof, and relates to the technical field of neodymium-iron-boron magnet preparation, and the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet comprises the following preparation raw materials: 170-175 kg of PrNd (praseodymium-neodymium alloy), 25-30 kg of BFe (iron white copper), 1-5 kg of Co (cobalt), 0.1-2 kg of Cu (copper), 1-5 kg of Zr (zirconium), 0.1-1 kg of Ga (gallium) and 380-420 kg of Fe (iron). According to the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and the preparation method thereof, the 54H sintered neodymium-iron-boron magnet is prepared through a double-alloy technology with neodymium, iron and gallium as auxiliary alloy without adding dysprosium, terbium and other scarce type heavy rare earth elements, and performance optimization and cost optimization of the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet are achieved.

The invention relates to the technical field of radiation rings, and discloses a compression molding process of a high-performance sintered NdFeB radiation ring, which comprises the following steps: S1, preparing a NdFeB radiation ring biscuit: S11, preparing powder; s12, the neodymium iron boron radiation ring is formed, and a neodymium iron boron radiation ring biscuit formed by combining the radiation ring inner layer and the radiation ring outer layer is formed; and S2, sintering: putting the biscuit into a sintering mold arranged in a furnace body, heating, and then cooling and forming. According to the compression molding process of the high-performance sintered neodymium-iron-boron radiation ring, dysprosium powder is gradually mixed on the outer layer of a neodymium-iron-boron radiation ring blank by utilizing a movable mold structure in the process of preparing the neodymium-iron-boron radiation ring blank, the dysprosium powder and the neodymium-iron-boron radiation ring blank are integrally molded and prepared, and then the high-performance neodymium-iron-boron radiation ring is obtained through sintering. The strength, the abrasion resistance and the service life of the Ru-iron-boron radiation ring are greatly improved, and the radiation ring can be provided with a top cover structure convenient to assemble through the combination of a plurality of dies.

The invention relates to the technical field of spherical particle dysprosium oxide, and discloses monodisperse spherical particle dysprosium oxide with the particle size smaller than 300 nm and a preparation method of the monodisperse spherical particle dysprosium oxide. The preparation method comprises the following steps: S1, a precipitate preparation process: a, preparing a dysprosium chloride-PEG mixed solution; preparing a urea solution; b, adding the dysprosium chloride-PEG mixed solution into a urea solution to obtain a primary material A mixed solution; c, heating the primary material A mixed solution in an electric furnace, keeping the temperature constant, and adjusting the pH value to obtain a precipitate A; d, aging the precipitate, discarding mother liquor, washing, and carrying out suction filtration to obtain a precipitate B; s2, a calcining process: a, putting the precipitate into a crucible, and opening a cover; b, putting the crucible into a muffle furnace for calcining, and calcining in three stages in a stepped temperature control manner; and S3, an ultrasonic process. Realizing lt; successful research and development of 300nm submicron particle rare earth dysprosium oxide not only is a size breakthrough, but also monodispersity means that the particles are highly uniform in size, morphology and composition, and the rare earth dysprosium oxide has good application prospects in the fields of catalysis, biomedicine, magnetic materials and the like.

A bond coat material providing unexpectedly high resistance to thermal cycle fatigue and sulfurization and unexpectedly extended thermal cycle life in the high temperature environment of a gas turbine engine component in the presence and absence of sulfur contains: a) 10 to 30 weight percent chromium, b) at least one of tantalum and molybdenum in a total amount of 3 to 15 weight percent, c) 5 to 13 weight percent aluminum, d) 0.1 to 1.4 weight percent silicon, e) 0.1 to 0.8 weight percent yttrium, f) 0 to 1.2 weight percent carbon, g) 0 to 1 weight percent dysprosium, h) 0 to 1 weight percent cerium, i) the balance being nickel, and the percentages of a) through i) adding up to 100 weight percent. The total amount of tantalum and molybdenum and the amounts of aluminum and silicon are each critical to avoid delamination of the top coat from the bond coat.

A dielectric ceramic composition includes a barium titanate (BaTiO3)-based base material main ingredient and an accessory ingredient, the accessory ingredient including dysprosium (Dy) and praseodymium (Pr) as first accessory ingredients. A content of the Pr satisfies 0.233 mol≤Pr≤0.699 mol, based on 100 mol of the barium titanate base material main ingredient.

The utility model discloses a magnetic steel surface dysprosium infiltration device which comprises a machine frame, a rectangular installation frame is arranged on the machine frame, a dysprosium infiltration reaction cavity is arranged in the rectangular installation frame in a rotating mode, and a limiting structure is arranged in the dysprosium infiltration reaction cavity. A driving motor is arranged at one end of the dysprosium permeation reaction cavity; heat preservation structures are arranged on the upper and lower sides of the rectangular mounting frame; and a dysprosium source supply box is arranged below the rectangular mounting frame. The dysprosium permeation reaction cavity is rotationally arranged in the rectangular mounting frame, and one end of the dysprosium permeation reaction cavity is driven by the driving motor, so that magnetic steel can be in all-dimensional and uniform contact with a dysprosium source in the dysprosium permeation process; heat insulation structures on the upper and lower sides of the rectangular mounting frame can effectively reduce heat loss and maintain the stability of the temperature in the reaction cavity; a heating assembly arranged on the inner surface of the dysprosium permeation reaction cavity is electrically connected with a main control device on the top of the rack, and an operator can accurately regulate and control the working state of the heating assembly through the main control device.

The invention relates to a microbial growth activation accelerant based on rare earth elements as well as a preparation method and application thereof, and belongs to the field of resources and environments. The microbial growth activation accelerant based on the rare earth elements is prepared from the following components: 1 to 150g of a rare earth compound, 0.2 to 2g of pantothenic acid, 0.2 to 2g of nicotinic acid, 0.02 to 0.1 g of nicotinamide and 1000g of deionized water, the rare earth compound is one or combination of more of chlorides of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium, nitric acid compounds and sulfuric acid compounds. A large number of cheap light rare earth elements are used as raw materials of the microbial accelerator, a new utilization approach is provided for the light rare earth elements, the light rare earth elements are converted into high-added-value products, pollution of the light rare earth elements to the environment is reduced, and meanwhile new elements are introduced into the field of microbial accelerators. More importantly, the preparation method of the microbial growth activation accelerant based on the rare earth elements provided by the invention is simple in production process and convenient for large-scale production.

The application provides a high-transparency BOPP heat-seal film, which comprises a base film and high-transparency films compounded on both sides of the base film, the base film is prepared from raw materials comprising homopolymerized polypropylene, an antistatic agent, a slip agent, sorbitol and a first rare earth additive, and the high-transparency film is prepared from raw materials comprising copolymerized polypropylene, metallocene polyethylene, SEBS, modified nanometer spherical silica, an anti-fogging agent and a second rare earth additive; wherein the first rare earth additive is nanometer lanthanum oxide and yttrium-based organic salt with a mass ratio of (2-3):1, and the second rare earth additive is cerium salt, lanthanum stearate and dysprosium salt with a mass ratio of 2:(1-1.5):1. The high-transparency BOPP heat-seal film realizes an optimized balance between transparency, heat-seal performance and mechanical strength through synergistic modification of multiple components in the formula.

The invention relates to a novel functional material for X-ray protection, in particular to a liquid metal flexible shielding material and a preparation method and application thereof. The material comprises liquid metal and solid metal, the liquid metal serves as a solvent to be filled in gaps of the solid metal, the liquid metal is gallium, gallium indium, gallium indium tin, gallium indium tin zinc or mercury, and the solid metal is selected from one or more of indium, tin, gold, platinum, iridium, zirconium, niobium, molybdenum, ruthenium, osmium, rhenium, rhodium, tungsten, antimony, palladium, tantalum, hafnium, lutetium, lead, ytterbium, thulium, bismuth, silver, erbium, holmium, dysprosium, terbium, gadolinium, samarium, neodymium, lanthanum, praseodymium, cerium and europium. On the basis of compounding of the liquid metal solvent and the solid metal solute based on the liquid metal combinatology, the liquid metal and the solid metal are jointly used for protecting X-ray radiation, the comprehensive performance of X-ray protection is improved, and meanwhile the variety and number range of selectable metal elements is widened.

The present application relates to a kind of high radiation resistance of control rod for stack entropy rare earth zirconate ceramic material and its preparation method and application, belong to nuclear reactor neutron absorption rod material technical field.The control rod ceramic material provided by the present application is prepared by using europium oxide, dysprosium oxide, thulium oxide and zirconium oxide as raw materials, according to certain proportion, after ball milling, calcination, green body forming and green body sintering process, and then processing to obtain the middle entropy rare earth zirconate ceramic material that can be applied to control rod.The rare earth zirconate ceramic material has excellent radiation resistance, large neutron absorption cross section and low reactivity value loss, and has high density, excellent thermal conductivity and low thermal expansion coefficient, and shows good application prospect in the field of control rod materials.

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 temperature measuring method and device for the internal flow channel of a heat exchanger. The method comprises the following steps: taking dysprosium and erbium co-doped quartz optical fiber as a temperature sensing element; exciting rare earth ions in the optical fiber to generate characteristic fluorescence; collecting dysprosium and erbium fluorescence signals; obtaining the fluorescence lifetime of dysprosium and comparing it with a characteristic threshold to obtain a temperature classification; based on the temperature classification, different segmented weighted fusion algorithms are respectively used to calculate the sensor temperature; when the temperature classification is consistent with the calculation result of the weighted fusion algorithm, the calculation result is output; when the temperature classification is not consistent with the calculation result of the weighted fusion algorithm, the calculation result is used to correct the temperature classification, and the segmented weighted fusion algorithm is called by using the corrected temperature classification to obtain a measured result. The application can improve the accuracy of temperature measurement.

The application is a preparation method of a chemical vapor deposition dysprosium hafnium oxide ceramic coating, which uses Dy and Hf metal particles and related process gas as raw materials, uses chemical vapor deposition technology, and controls the heating temperature of a vacuum chamber of a chemical vapor deposition device, vacuum degree, process gas type and flow, deposition time and other factors to first co-deposit and prepare Dy2O3 and HfO2 mixed oxides on the surface of a nickel-based high-temperature alloy, and then in-situ synthesize a Dy2Hf2O7 ceramic coating with a fluorite structure at high temperature. The ceramic coating has the advantages of stable high-temperature phase structure, low thermal conductivity, sintering resistance, molten salt corrosion resistance and excellent strain tolerance, is suitable for use in high-temperature flame service working conditions above 1300 DEG C, and can improve the heat insulation effect of the thermal barrier coating of the turbine blade of an aero-engine.

The invention relates to the technical field of barium titanate-based ceramic preparation, in particular to a rare earth ion doped barium titanate-based ceramic material and a preparation method thereof.High-purity tetragonal-phase barium titanate is prepared through a hydrothermal synthesis process, doped ions comprise two rare earth ion elements including europium and dysprosium, and one or more of sodium, magnesium, bismuth, niobium, cobalt, lanthanum and the like are cooperatively doped; barium titanate powder and ion-doped oxide powder are mixed according to a certain proportion, and the ion-doped barium titanate ceramic is prepared through solid-phase sintering. By adopting the formula and the preparation method disclosed by the invention, a barium titanate-based ceramic capacitor product with excellent dielectric property, high stability and low loss can be obtained, and the preparation method is suitable for preparing a high-temperature and high-performance multilayer ceramic capacitor.

The invention belongs to the field of neodymium-iron-boron surface grinding, and particularly relates to a neodymium-iron-boron surface treatment device for neodymium-iron-boron surface dysprosium infiltration. An annular grinding table is rotationally arranged outside an air storage barrel, an annular cavity is formed in the annular grinding table, and a plurality of conical discharging barrels are annularly and uniformly arranged in the annular cavity; an arc-shaped grinding plate is arranged on the inner arc face, close to the outer circle face of the annular grinding table, of each conical discharging barrel, a transmission wheel is rotationally arranged between each conical discharging barrel and the air storage barrel, an annular groove is formed in the position, below the multiple conical discharging barrels, of the upper end face of the workbench, and the multiple grinding plates are annularly and evenly arranged in the annular groove. A plurality of top grinding assemblies are arranged above the multiple conical discharging barrels in a sliding mode. According to the neodymium iron boron grinding device, through the arrangement of the conical discharging barrel and other assemblies, neodymium iron boron can be ground in all directions, meanwhile, intermittent grinding of the neodymium iron boron can be achieved through intermittent downward pressing of the grinding belt, and the frustum-shaped neodymium iron boron has spare time for cooling and heat dissipation.

The invention discloses a diffusion source and a diffusion method for improving the coercive force of a sintered neodymium-iron-boron magnet, and the diffusion source comprises the following components in atomic ratio: more than 80 at.% of heavy rare earth elements, 10-19 at.% of low-melting-point metal elements, not more than 0.2 at.% of high-melting-point metal elements, and not more than 1 at.% of magnetic elements, wherein the heavy rare earth element is at least one of dysprosium and terbium; the low-melting-point metal is at least one of aluminum, copper, gallium, tin and zinc; the high-melting-point metal is at least one of zirconium, vanadium, tungsten, niobium, titanium and manganese; the magnetic element is at least one of iron, cobalt and nickel. The diffusion effect of the diffusion source is remarkably improved by optimally designing the components, the adhesion mode and the diffusion process of the alloy diffusion source, and the diffusion source is mainly used for improving the coercive force of the sintered neodymium-iron-boron magnet through grain boundary diffusion and is particularly suitable for improving the coercive force of the sintered neodymium-iron-boron magnet with the thickness larger than 10 mm through grain boundary diffusion.

This invention provides a method for mineralizing and recovering dysprosium ions from Bacillus pasteurellii, comprising the following steps: 1) Cell culture: Activated Bacillus pasteurellii is inoculated into CASO liquid medium and cultured for 22-26 hours, then centrifuged to collect the cell bodies; 2) Induced mineralization of Bacillus pasteurellii: The cell bodies collected in step 1) are mixed with a calcium source, urea, and dysprosium ions (Dysprosium). 3+ The dysprosium-containing precipitate was obtained by incubation with an inducing solution and filtration. This invention belongs to the field of bio-environmental protection technology. The method for mineralizing and recovering dysprosium ions using Bacillus pasteurellium provided by this invention can efficiently mineralize rare earth ions Dysprosium. 3+ No need to deal with Dy 3+ After pretreatment of the solution and biomineralization, the dysprosium-containing precipitate can be directly obtained by filtration without centrifugation, making the operation simple. 3+ The recovery rate is as high as 98.4%.

The invention provides an alloy aluminum foil for a lithium battery and a manufacturing method thereof, and relates to the technical field of aluminum-based alloys, electrolytic aluminum water is adopted as a raw material for smelting and casting, the alloy aluminum foil comprises the following components in percentage by mass: 0.30-0.50% of Fe, 0.07-0.12% of Si, 0.01-0.04% of Cu, 0.01-0.03% of Ti, 0.01-0.03% of Zr, less than or equal to 0.01% of Mn, less than or equal to 0.005% of Mg, less than or equal to 0.005% of Zn, 0-0.10% of Dy, 0-0.10% of Ho and 0-0.10% of Y, the sum of the mass percentages of Dy, Ho and Y is 0.01-0.20%, rare earth elements are added in the form of dysprosium iron, holmium iron and yttrium iron metals, and the balance of aluminum the rare earth element accounts for 50-80% of the alloy; the balance is Al and inevitable impurities; wherein the mass ratio of Fe to Si is 2.5-4.0, and the total content of Fe and Si is less than or equal to 0.38%. The surface wetting tension and the mechanical property of the aluminum foil are improved by limiting the Fe / Si ratio to be 2.5-4.0 and controlling Fe + Si to be smaller than or equal to 0.38%, adding dysprosium iron, holmium iron and yttrium iron to control 50-80% of rare earth, generating a nano precipitated phase through hot rolling annealing, controlling the grain size to be smaller than or equal to grade 1, performing double-rack cold continuous rolling ply rolling to 0.009-0.012 mm, and regulating the annealing strip speed and the injection pressure.

A rare-earth-doped aluminum-based composite material for shielding spent nuclear fuel comprises, by weight percentage: gadolinium oxide 1 wt.%–10 wt.%, europium oxide 1 wt.%–10 wt.%, samarium oxide 1 wt.%–10 wt.%, dysprosium oxide 1 wt.%–10 wt.%, erbium oxide 1 wt.%–10 wt.%, with the remainder being 6063 aluminum alloy powder. This invention exhibits excellent neutron absorption capacity. The aluminum-based material maintains both low weight and high strength and ductility. Furthermore, the addition of rare-earth elements such as Gd, Eu, and Sm, which have high thermal neutron absorption cross-sections, significantly enhances the material's neutron absorption capacity. The introduction of rare-earth elements such as Gd, which react with neutrons in an (n,γ) reaction, effectively prevents the formation of numerous helium bubbles in the matrix, thus improving the material's practical service life.

Provided is an aluminum alloy powder comprising 0.1-2.0 mass% or one or more metal elements from among rare earth metal elements comprising the lanthanide elements and yttrium, wherein the iron content is suppressed to not more than 2.0 mass%. The rare earth metal element is preferably one of praseodymium, neodymium, europium, samarium, terbium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium.

The application discloses a preparation method of a bite plate based on a force-induced luminescent material. It belongs to the technical field of oral bite plates and can prepare a bite plate capable of directly and real-timely converting bite force into a visible light signal through a simple process, so that the visualization and semi-quantitative detection of bite contact are realized. The preparation method of the bite plate based on the force-induced luminescent material is characterized in that the method comprises the following steps: (1) synthesizing europium / dysprosium co-doped strontium aluminate force-induced luminescent material SAOED by using a high-temperature solid-phase method, wherein the doping concentration of europium is 2%, and the doping concentration of dysprosium is 1%; (2) mixing the SAOED powder obtained in the step (1) with denture powder according to a mass ratio of 1:7, adding ethanol for dispersion and grinding; (3) adding denture water in a proportion corresponding to the denture powder to the mixture in the step (2), uniformly stirring, and then performing compression molding; and (4) performing water bath heating solidification on the compression molded material, and then performing polishing to obtain the bite plate.

The invention discloses a dysprosium-based half-Heusler polycrystalline material and a preparation method and application thereof, the chemical formula of the polycrystalline material is Dy < 1-x > Y < x > Pt < 1-y > Ni < y > Sb, x and y represent atomic percent, x is more than or equal to 0 and less than 1.0, and y is more than or equal to 0 and less than or equal to 0.4; the preparation method comprises the following steps: weighing metal raw materials according to the stoichiometric ratio of the raw material composition Dy < 1-x > Y < x > Pt < 1-y > Ni < y > Sb, mixing Pt, Ni and Sb, and smelting to obtain a precursor Pt < 1-y > Ni < y > Sb; and carrying out secondary smelting on Dy and Y metal raw materials and the precursor Pt1-yNiySb to obtain a smelted cast ingot, and carrying out crushing, ball milling and sintering to obtain the polycrystalline material. The material is composed of dysprosium and yttrium as main rare earth elements matched with Pt and Sb elements, the peak thermoelectric figure of merit and the average thermoelectric figure of merit are remarkably improved through regulation and control of the component content and the double-layer synergistic effect of the preparation method, and the highest thermoelectric figure of merit can reach 1.33.

A bond coating material providing unexpectedly high thermal cyclic fatigue resistance and sulfidation resistance, and unexpectedly prolonged thermal cycle life in high temperature environments of gas turbine engine components with and without the presence of sulfur contains: a) 10% to 30% by weight chromium, b) at least one of tantalum and molybdenum in a total amount of 3% to 15% by weight, c) 5% to 13% by weight aluminum, d) 0.1% to 1.4% by weight silicon, e) 0.1% to 0.8% by weight yttrium, f) 0% to 1.2% by weight carbon, g) 0% to 1% by weight dysprosium, h) 0% to 1% by weight cerium, i) the balance being nickel, and the percentages of a) to i) adding up to 100% by weight. The total amount of tantalum and molybdenum, and the amounts of aluminum and silicon are each critical for avoiding delamination of a top coat from a bond coat.

An antiferroelectric and a method for manufacturing an antiferroelectric are disclosed herein. The antiferroelectric may have high permittivity and breakdown voltage by having a PbxLa1-x([Zr1-YSnY]ZTi1-Z) composition. The manufacturing of the antiferroelectric may be performed through appropriate mixing and dysprosium addition.

This application relates to the field of functional materials preparation technology, specifically to a dysprosium-based magnetoelectric compound with magneto-controlled electrical behavior constructed using chiral proline as a ligand, its preparation method, and its application. This dysprosium-based magnetoelectric compound allows for the modulation of its electrical properties using a magnetic field. This dysprosium-based magnetoelectric compound addresses the limitations of molecular-based magnetoelectric coupling materials and their demanding preparation conditions. It is an eight-coordinate dysprosium-based molecular magnetoelectric material that simultaneously exhibits slow magnetic relaxation behavior and magnetic field-controlled electrical properties. The resulting magnetoelectric properties can significantly improve the information storage density of non-volatile memories and contribute to improving the performance of molecular spintronic devices. Its unique performance advantages not only help overcome the performance bottlenecks of traditional silicon-based electronic devices but also provide a new breakthrough for the fundamental research and application development of magnetoelectric materials.

To provide a multilayer electronic component that meets the target TCC characteristics and offers excellent reliability even when high voltage is applied. [Solution] The stacked electronic component includes a body containing a dielectric layer and internal electrodes, and external electrodes disposed on the body. The dielectric layer contains a plurality of dielectric crystal grains, and at least one of the plurality of dielectric crystal grains has a core-double shell structure including a core 11, a first shell 12 surrounding at least a part of the core, and a second shell 13 surrounding at least a part of the first shell. The first shell and the second shell contain rare earth elements, including at least one of gadolinium (Gd), yttrium (Y), dysprosium (Dy), and terbium (Tb). The average atomic percentage of rare earth elements in the first shell is higher than the average atomic percentage of rare earth elements in the second shell, and the average atomic percentage of rare earth elements in the first shell is 4.0 at% or more and 6.0 at% or less.

This invention discloses a method utilizing In 3+ Doping control of SrGa2O4:Dy 3+ The method for determining the luminescent properties of phosphors includes the following steps: 1. Based on the chemical formula: Sr 1‑x Ga 2‑y O4:xDy 3+ ,yIn 3+ Strontium carbonate, gallium oxide, dysprosium oxide, and indium oxide were weighed out as raw materials according to the following molar ratios: 1. The weighed raw materials were placed in an agate mortar, and alcohol was added to assist grinding, ensuring thorough mixing of the sample. 2. The uniformly mixed raw materials were poured into an alumina crucible, covered, and placed in a muffle furnace. The mixture was heated to 1400 °C and sintered at this temperature for 10 hours in an air atmosphere. 3. After sintering at this temperature, the mixture was cooled to room temperature. 4. The cooled sample was removed, ground, and sieved through a 200-mesh sieve to obtain In. 3+ With Dy 3+ Co-doped SrGa2O4 yellow phosphor. The phosphor prepared by this method shows significant improvements in both luminescence intensity and fluorescence lifetime.

The invention discloses a preparation method and application of a rare earth / bimetal synergistically enhanced composite photocatalyst, the rare earth / bimetal synergistically enhanced composite photocatalyst comprises a defect type titanium dioxide TiO2-x carrier rich in oxygen vacancies, copper-nickel bimetal nanoparticles are loaded on the TiO2-x carrier, and rare earth elements are doped on the TiO2-x carrier; the rare earth element is at least one or any combination of ytterbium, erbium, neodymium, cerium and dysprosium, and the doping amount of the rare earth element is 0.1-1%; the molar ratio of copper to nickel is 1: (0.9-1.1); the molar ratio of the sum of the molar weights of copper and nickel to TiO2-x is 2: (6-7). According to the invention, three mechanisms of defect engineering, bimetallic plasmon effect and rare earth element modification are synergistically combined, so that the prepared catalyst has full-spectrum response capability and efficient photo-generated charge separation efficiency, and shows excellent degradation performance on antibiotic pollutants such as norfloxacin under visible light and near-infrared light; and the preparation method is simple and low in cost, and has a wide application prospect.

The invention relates to a hydrometallurgical process for REE recovery comprising the following steps of submitting a powder comprising at least one rare earth element and iron to acid leaching to dissolve at least the rare earth, and selectively precipitating at least one rare earth element of the list consisting in Neodymium (Nd), Praseodymium (Pr), Dysprosium (Dy) or Samarium (Sm). This process is applicable at industrial scale and achieves an improved efficiency compared to existing processes.