142 results about "Gadolinium" 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 double-ceramic-layer thermal barrier coating of a differentiated columnar crystal structure and a preparation method, and belongs to the technical field of thermal barrier coating corrosion and protection. The invention innovatively discovers and utilizes the double influence of the columnar crystal size on the performance of the coating; the YSZ layer adopts a fine grain structure of 1-1.5 microns, so that the bonding strength and thermal shock resistance of the coating can be obviously improved; and the modified gadolinium zirconate layer adopts a 2-3 [mu] m coarse grain structure, so that the heat conductivity can be reduced, the permeation path of CMAS along a grain boundary can be effectively inhibited, and meanwhile, the modified gadolinium zirconate layer reacts with CMAS to form a compact barrier layer to prevent further permeation of CMAS. Through accurate regulation and control of electron beam physical vapor deposition (EB-PVD) process parameters, differential control of the sizes of the two layers of ceramic columnar crystals is realized, and under the synergistic effect of the two columnar crystal structures with different sizes, the thermal cycle life and CMAS corrosion resistance of the whole coating system in an ultra-high-temperature environment are remarkably prolonged and improved.

The invention discloses an anti-radiation medical protective glove and a production process thereof, and belongs to the technical field of medical protective gloves, a polydopamine hollow microsphere is prepared by using ZIF-8 as a self-sacrifice template, bismuth and gadolinium elements are loaded through hydrothermal synthesis and ion adsorption, a composite shielding microsphere is prepared, and the composite shielding microsphere is used for preparing the anti-radiation medical protective glove. Then, the composite shielding microspheres and a nano starch enhanced cross-linked network are synergistically introduced into a natural latex matrix, after dipping forming, a hydrophilic / hydrophobic wetting gradient is constructed on a glove lining through mask auxiliary plasma etching, and the anti-radiation medical protective glove is prepared. Through the cooperation of the shielding function of the composite microspheres, the mechanical enhancement of a nano starch cross-linked network and the surface one-way moisture conduction function, the glove has excellent radiation protection performance and also has the characteristics of being light, flexible and comfortable to wear, the problems that a traditional lead rubber glove is heavy, rigid and poor in air permeability are effectively solved, and the service life of the glove is prolonged. The system is especially suitable for medical scenes requiring high flexibility and comfort, such as interventional radiosurgery.

The invention relates to an iron-containing gadolinium-doped cerium oxide electrode material, a solid oxide battery and a preparation method, the chemical formula of the iron-containing gadolinium-doped cerium oxide electrode material is FexGd0. 1Ce0. 9-xO2-delta, x is more than or equal to 0.025 and less than or equal to 0.2, and delta is more than or equal to 0.05 and less than or equal to 0.2. The preparation method comprises the following steps: adding a gadolinium source, a cerium source and an iron source into deionized water according to a stoichiometric ratio, uniformly mixing to obtain a mixed solution, sequentially adding a complexing agent and a pH regulator into the mixed solution, and heating and stirring for reaction to obtain precursor gel; drying and crushing the precursor gel to obtain precursor powder; and calcining the precursor powder to obtain the iron-containing gadolinium-doped cerium oxide electrode material. The electrode material disclosed by the invention is relatively simple and uniform in component; when being used as a fuel electrode to be applied to a solid oxide electrolytic cell for CO2 electrolysis, the composite material shows excellent electrochemical performance, and can still keep a stable structure and good durability after long-term operation in a high-temperature CO2 atmosphere.

Provided is an inorganic fiber or inorganic flake having excellent neutron shielding properties. A formulation composed of a base component in which SiO2 and Al2O3 are the main components (in which the total mass ratio of SiO2 and Al2O3 in the base component is 0.60 or more) and a neutron shielding component composed of at least one of gadolinium, gadolinium oxide, samarium, samarium oxide, cadmium, or cadmium oxide is prepared in a ratio of 50 to 90 parts by mass of the base component and 10 to 50 parts by mass of the neutron shielding component, and then melted, thereby obtaining a good amorphous inorganic fiber and inorganic flake.

The application discloses a double-gas-chamber neutron detector, belonging to the technical field of nuclear radiation detection and particle detection, comprising a gadolinium film neutron conversion layer, two time projection chamber (TPC) modules and an optional energy quantifier module. After capturing thermal neutrons, the gadolinium film generates multi-state particles, and the two TPC modules realize 4π solid angle neutron detection through electronic signal coincidence. The application replaces the scarce 3 He with gadolinium, combines the track reconstruction capability of the double TPC module, significantly improves the neutron detection efficiency and signal-to-noise ratio, and is suitable for nuclear reactor monitoring, industrial material analysis, agricultural moisture detection and deep space exploration and other fields. Through electronic-gamma coincidence measurement and mode recognition, high-precision neutron signal reconstruction and environmental background suppression are realized.

The invention discloses an MMP-9-targeted MRI (Magnetic Resonance Imaging) nanoprobe and a preparation method and application thereof, the MMP-9-targeted MRI nanoprobe is represented by Gd-ACC-MAP and comprises amorphous calcium carbonate and an aptamer covalently connected to the surface of the amorphous calcium carbonate, the calcium carbonate is doped with gadolinium, and the aptamer has a nucleotide sequence as shown in SEQ ID NO: 1. The MRI nanoprobe can be used for early diagnosis of aneurysm and evaluation of rupture risk of the aneurysm.

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 invention relates to the field of high-temperature thermal resistance coatings, in particular to a material selection and preparation process of a low-infrared-transmittance coating, and particularly relates to a preparation method of a high-scattering-rate high-temperature thermal resistance coating, a base material of the high-scattering-rate high-temperature thermal resistance coating is Gd2Zr2O7, and the high-scattering-rate high-temperature thermal resistance coating further comprises a second-phase material; firstly, a required second-phase material is screened on the basis of machine learning in combination with experiments and a first principle, then a PS-PVD gas phase-solid phase codeposition method is adopted, the high-scattering-rate high-temperature thermal resistance coating is prepared, according to the obtained coating, a high-refractive-index-low-refractive-index interface between GdFeO3 particles and Gd2Zr2O7 gas phase columnar crystals can effectively increase scattering of infrared radiation, and the heat resistance of the coating is improved. And the vapor phase and solid phase co-deposited columnar crystals have uniform thermal physical properties, so that excellent coating binding force and excellent anti-sintering performance are provided.

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 semiconductor device includes a first substrate, a first active pattern including a first lower pattern and a plurality of first sheet patterns, a first gate structure surrounding the plurality of first sheet patterns, a first high-k insulating film disposed between the first gate structure and the plurality of first sheet patterns, and a second high-k insulating film disposed between the first gate structure and the plurality of first sheet patterns. A semiconductor device includes a plurality of first sheet patterns, a first high-k insulating film disposed between the plurality of first sheet patterns, a first gate insulating film disposed between the plurality of first sheet patterns and the first high-k insulating film, a plurality of second sheet patterns, a second gate structure surrounding the plurality of second sheet patterns, and a second high-k insulating film disposed between the second gate structure and the plurality of second sheet patterns, the second high-k insulating film includes a second dopant different from the first dopant, and the second dopant includes at least one of silicon, aluminum, zirconium, yttrium, scandium, nitrogen, gadolinium, and germanium.

The invention discloses a high-strength magnesium-zinc-yttrium rare earth 3D printing alloy and application, and belongs to the technical field of 3D printing alloys, the high-strength magnesium-zinc-yttrium rare earth 3D printing alloy comprises the following components in parts by mass: 87.5-91.0 parts of magnesium, 6.0-8.0 parts of zinc, 2.0-3.0 parts of yttrium, 1.5-2.5 parts of gadolinium, 1.0-2.0 parts of scandium, 0.8-1.5 parts of zirconium, 0.5-1.2 parts of calcium and 0.28-0.6 part of manganese, the total mass of metal impurities does not exceed 0.15 part, and the balance is magnesium. A single metal impurity does not exceed 0.05 part; the alloy application comprises the following steps of S1, smelting and atomization, S2, screening and treatment, S3, printing forming and S4, aftertreatment. The alloy with excellent 3D printing formability, ultrahigh strength, good toughness and reliable thermal stability is developed through collaborative design of multi-component components, accurate control of key process parameters and systematic optimization of a post-treatment system; an ideal material is provided for manufacturing of light-weight and high-performance complex components in the fields of aerospace, high-end medical instruments and the like.

The invention provides a microwave phase measurement system based on magneton-photon coupling characteristics. According to the system, an integrated electrode support / GGG / YIG / Pt multilayer structure is embedded in a microwave cavity, and magnetons carry microwave phase information through coupling of the magnetons and photons in the YIG. Magneton precession of the YIG layer causes spin current to be generated in the Pt layer, the spin current is converted into measurable voltage signals through inverse spin Hall effect, and high-resolution phase measurement is realized by means of frequency mixing, coherent detection and the like. The method is high in anti-interference capability, can realize high-sensitivity and low-cost microwave phase measurement, and is expected to be used in the fields of spintronics, microwave measurement, quantum information reading and the like.

The present invention provides a method for providing a composite luminescent particle, comprising: (a) providing (i) a luminescent material comprising (A1-xBx) 3 (C1-yDy) 5O12 nanoparticles or a precursor thereof, A comprising one or more of yttrium, lutetium, gadolinium, lanthanum; b comprises one or more rare earth elements; c comprises one or more of aluminum, gallium and scandium; d comprises one or more transition metal ions; 0 < = x < = 1, 0 < = y < = 1, x + ygt; 0; and (ii) also providing an oxide material precursor, the oxide material having a melting point of at least 850 DEG C; (b) mixing (i) a luminescent material comprising (A1-xBx) 3 (C1-yDy) 5O12 nanoparticles or a precursor thereof with (ii) an oxide material precursor; (c) curing the oxide material precursor to obtain cured particles which comprise a luminescent material and an oxide material coating layer; (d) heating the cured particles at a first temperature of 600 DEG C or more for a first duration of 10 minutes or more; and (c) heating the cured particles at a second temperature of 700 DEG C or more for a second duration of 1 hour or more in a reducing atmosphere including carbon monoxide.

The invention discloses a macrostructure inspection method of a high-activity and high-purity rare earth metal gadolinium target material, and belongs to the technical field of physical testing. The method comprises the steps of processing a macroscopic sample, preparing a macroscopic corrosive agent, carrying out macroscopic corrosion and inspecting a macrostructure. Firstly, the surface of a gadolinium target macroscopic sample is machined; then performing low-power corrosion on the gadolinium target material sample; and finally, observing the macroscopic tissue of the sample by visual observation or a magnifying lens and collecting a macroscopic tissue image. The method has the advantages of no over-corrosion or non-uniform corrosion phenomenon, obvious grain boundary and clear structure, and is convenient for carrying out macroscopic structure uniformity observation and analyzing and identifying defects such as inclusion, looseness and air holes. The problems that due to intrinsic characteristics of high purity, active chemical properties and the like of the gadolinium target, during conventional low-power corrosion, corrosion pits, blackening and darkening of the surface, serious oxidation and other illusions are extremely prone to occurring are solved, and high-quality development of rare earth gadolinium target products used in the key strategic fields of integrated circuits, OLED display and the like is promoted.

The present application relates to the field of fluorescent material, and disclose a kind of samarium activated garnet-based red fluorescent powder, including Na, Gd, Sm, Ga, In and Ge, wherein, the amount-of-substance ratio of metal element is Na:Gd:Sm:Ga:In:Ge=1:2-2x:2x:2:1:2, x is the doping amount of samarium in inert rare earth site, 0.01≤x<0.10, the fluorescent powder proposed in the present application utilizes new garnet matrix constructed by sodium, gadolinium, gallium, indium, germanium, and has significant advantages compared to the traditional garnet isomorphic system constructed by containing aluminum, silicon, alkaline earth metal in preparation process.By using the new matrix, the reaction temperature of solid-phase synthesis fluorescent powder is greatly reduced, and no auxiliary solvent is needed, and it can be synthesized in one step.The preparation method of the present application does not require specific pressure and atmosphere requirements during the reaction process.This means that the preparation process is more flexible, and does not require high-pressure equipment or complex atmosphere control, simplifying the operation steps, improving the efficiency and feasibility of preparation.

A multilayer ceramic capacitor and a method of manufacturing the multilayer ceramic capacitor including a capacitor body including a dielectric layer and an internal electrode layer, and an external electrode disposed on an outer surface of the capacitor body, wherein the dielectric layer comprises a first element including at least one selected from cerium (Ce), gadolinium (Gd), samarium (Sm), and lanthanum (La); and a second element including at least one selected from erbium (Er), yttrium (Y), thulium (Tm), and ytterbium (Yb), and a molar ratio of the first element to the second element is 1.5 to 4.0.

The invention relates to novel biocompatible hybrid nanoparticles of very small size, useful in particular for diagnostics and / or therapy.The purpose of the invention is to offer novel nanoparticles which are useful in particular as contrast agents in imaging (e.g. MRD and / or in other diagnostic techniques and / or as therapeutic agents, which give better performance than the known nanoparticles of the same type and which combine both a small size (for example less than 20 nm) and a high loading with metals (e.g. rare earths), in particular so as to have, in imaging (e.g. MRI), strong intensification and a correct response (increased relaxivity) at high frequencies.Thus, the nanoparticles according to the invention, with diameter d1 between 1 and 20 nm, each comprise a polyorganosiloxane (POS) matrix including gadolinium cations optionally associated with doping cations; a chelating graft C1 DTPABA (diethylenetriaminepentaacetic acid bisanhydride) bound to the POS matrix by an —Si—C— covalent bond, and present in sufficient quantity to be able to complex all the gadolinium cations; and optionally another functionalizing graft Gf* bound to the POS matrix by an —Si—C— covalent bond (where Gf* can be derived from a hydrophilic compound (PEG); from a compound having an active ingredient PA1; from a targeting compound; from a luminescent compound (fluorescein).The method for the production of these nanoparticles and the applications thereof in imaging and in therapy also form part of the invention.

An europium activating β-type sialon phosphor contains at least one kind of element selected from the group made of yttrium, titanium, and gadolinium, wherein the total content of the at least one kind of element is more than 0 ppm and less than 1000 ppm.

The application discloses a single-element phase change memory material doped with a rare earth element gadolinium as well as a preparation method and application thereof. x Gd 100‑x 69.1 at.%≤x≤93.1 at.%, and is obtained by double-target sputtering of a Sb single-element target and a Gd single-element target in a magnetron sputtering coating system; the material successfully overcomes the inherent defect of poor thermal stability of a pure Sb thin film, has a higher crystallization temperature, a larger activation energy, a better data retention and an extremely low resistance drift compared to a traditional GST material, and provides a new material selection for realizing stable and reliable storage of a phase change memory under long-term and high-cycle working conditions.

The application discloses a kind of gadolinium-doped ceria nanopowder flame synthesis device and synthesis method, it is related to nanometer powder material preparation technical field, gadolinium-doped ceria nanopowder flame synthesis device includes: synthesis device main body, synthesis chamber is in synthesis device main body, synthesis device main body is equipped with with synthesis chamber communication's discharge port;Bottom burner, bottom burner is equipped in the bottom of synthesis device main body, bottom burner is communicated with gas source, air source and first precursor source;Multiple rotary cutting burners, multiple rotary cutting burners are spaced apart along the circumference of synthesis device main body, each rotary cutting burner is communicated with gas source, air source and second precursor source, the axial direction of each rotary cutting burner is tangent to the projection of bottom burner perpendicular to the axial direction of bottom burner.According to the gadolinium-doped ceria nanopowder flame synthesis device of embodiment of the application has the advantages such as high synthesis efficiency, good synthesis uniformity.

This application discloses a magnetically responsive self-peelable membrane, its preparation method, and its application, belonging to the technical field of gamma pollution removal materials. The magnetically responsive self-peelable membrane comprises an ionic liquid, a film-forming matrix, a dispersion medium, a surfactant, a thickener, and a colorant. The ionic liquid is a magnetic imidazole onyx salt containing terbium, dysprosium, or gadolinium, imparting magnetic responsiveness to the membrane. The preparation method includes sequentially dissolving raw materials to prepare a mixture, coating the mixture onto the contaminated area by spraying or brushing to form a film, and achieving self-peeling using an electromagnet / permanent magnet. This application solves the problems of difficult mechanical peeling and high radiation risk of manual peeling in existing technologies, achieving non-contact, integrated peeling, with a removal rate of 78%~93% for gamma pollution on stainless steel surfaces, effectively avoiding secondary pollution.

This invention relates to a composite catalyst, its preparation method, and its application. The preparation method of the composite catalyst includes the following steps: S1: providing a composite support containing zirconium oxide and oxides of non-metallic elements; S2: doping the composite support with gadolinium to obtain a composite doped support; S3: doping the composite doped support with yttrium and other metallic elements; wherein the oxides of the non-metallic elements include one or more of silicon dioxide, boron trioxide, and phosphorus pentoxide; and the other metallic elements include one, two, or three of holmium, erbium, and thulium. The composite catalyst prepared according to one embodiment of this invention can be used in the urea hydrolysis reaction, enabling the urea hydrolysis reaction to proceed at a relatively low temperature, and the catalyst exhibits a high high-temperature activity retention rate.

The application discloses a preparation method of a lithium iron manganese phosphate positive electrode material in the field of lithium ion battery positive electrode materials and the positive electrode material. The method comprises the following steps: dissolving a manganese source, an iron source and a phosphorus source in water, adding ascorbic acid to adjust the pH value to form a uniform solution, and generating a precursor through high-temperature hydrothermal reaction. Then, the precursor is ball-milled and mixed with a pre-prepared yttrium-gadolinium co-doped lithium ion conductor, and middle-temperature sintering is carried out under an inert atmosphere to form a matrix material coated with the ion conductor. Finally, the matrix material is compounded with nitrogen-fluorine co-doped graphene carbon nanotube three-dimensional reinforcing bodies, ball-milling and low-temperature heat treatment are carried out to obtain the final product. Through the synergistic effect of the ion conductor coating and the two-dimensional carbon material enhancement, the ion and electron conduction capacity of the material is significantly improved, and the prepared positive electrode material has high capacity, excellent cycle stability and rate performance.

The application relates to the technical field of tungsten alloy materials, in particular to a tungsten alloy wire, a preparation method thereof and application of the tungsten alloy wire in semiconductor material cutting, wherein the tungsten alloy is composed of the following mass fractions of elements: L 0.4-1.1 wt%, Z 0.001-0.25 wt%, and the balance is tungsten and inevitable impurities; wherein L is at least one of lanthanum, cerium, praseodymium, neodymium, gadolinium and erbium; Z includes oxygen and boron; the wire diameter of the wire is 20-60 mu m; in the wire, there is linear L or a compound of L along the wire axis direction, and the radial average width D of the L or the compound of L is less than or equal to 5 nm. According to the application, the linear L element is doped between tungsten matrices, and the radial average width of the L is controlled to be less than or equal to 5 nm, so that the wire has a tensile strength of more than 5000 MPa under the wire diameter of 20-60 mu m, and the processing performance of the tungsten alloy wire is enhanced.

Downhole tools and processes for using same to detect radiation via scintillation. In some embodiments, the downhole tool can be deployable in a wellbore that traverses a formation. The downhole tool can include a tool housing configured for movement within and along the wellbore. The downhole tool can include a radiation detector that includes a scintillator material disposed within the tool housing. The scintillator material can include a cerium-activated gadolinium pyrosilicate. In some embodiments, the cerium-activated gadolinium pyrosilicate can have a chemical formula of: (Gd1-x-yCexAy)2Si2O7, where: x can be equal to 0.001 to 0.08, y can be equal to 0 or can be a number from 0.0001 to 0.079, if y is >0, A can include at least one rare-earth element selected from the group consisting of: Sc, Y, La, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Lu, and 1-x-y can be ≥0.92.

Alkylphosphocholine analogs incorporating a chelating moiety that is chelated to gadolinium are disclosed herein. The alkylphophocholine analogs are compounds having the formula:or a salt thereof. R1 includes a chelating agent that is chelated to a gadolinium atom; a is 0 or 1; n is an integer from 12 to 30; m is 0 or 1; Y is —H, —OH, —COOH, —COOX, —OCOX, or —OX, wherein X is an alkyl or an arylalkyl; R2 is —N+H3, —N+H2Z, —N+HZ2, or —N+Z3, wherein each Z is independently an alkyl or an aroalkyl; and b is 1 or 2. The compounds can be used to detect solid tumors or to treat solid tumors. In detection / imaging applications, the gadolinium emits signals that are detectable using magnetic resonance imaging. In therapeutic treatment, the gadolinium emits tumor-targeting charged particles when exposed to epithermal neutrons.

This application provides an in-situ grown needle-like blend of GdTaO4 / Sm-CeO2 radiation-resistant and antibacterial particles, its preparation method, and its application, relating to the fields of radiation protection materials and antibacterial materials. The radiation-resistant and antibacterial particles of this application use needle-like gadolinium tantalate as the radiation shielding matrix. A sheet-like samarium-doped cerium dioxide antibacterial component is uniformly grown on its surface using a hydrothermal in-situ growth method, resulting in a dual-functional composite material with an integrated needle-sheet blend structure. This application achieves strong interfacial bonding between the two phases through rare-earth lattice matching, while in-situ growth solves the core problem of easy agglomeration in physically blended powders. The resulting composite material possesses both radiation protection (X-rays + thermal neutrons) and highly efficient antibacterial functions. It exhibits controllable crystallization, strong batch stability, good compatibility with various matrices, stable structure, and uniform dispersion. It can be directly used as a functional filler or further processed into molds. The resulting products can be applied in fields such as nuclear industry protection, radiation medical dressings, military protective equipment, and civilian antibacterial and radiation-resistant products.

The invention relates to the technical field of rare earth permanent magnet material manufacturing, and discloses an isostatic pressing-free rare earth permanent magnet of gadolinium yttrium activated recycled powder and a preparation method, the magnet is prepared from sintered neodymium iron boron grinding recycled powder, a gadolinium yttrium intermediate alloy and a quick-setting casting piece, and a recycled material pre-wetting agent and an airflow mill online composite lubricant are further added into raw materials. The preparation method comprises the following steps: carrying out liquid-phase pre-wetting on the recycled material, mixing with a new material, and carrying out hydrogen decrepitation; dynamically injecting a composite lubricant in the grinding process of the jet mill to prepare modified fine powder; after being subjected to magnetic field orientation compression molding, the fine powder is directly packed into a box without being subjected to cold isostatic pressing treatment; and carrying out negative pressure removal, vacuum sintering and aging treatment to obtain a final product. According to the method, high-value utilization of recycled materials is achieved through pre-wetting oxidation blocking and heavy rare earth grain boundary regulation and control; the powder fluidity is improved through jet mill in-situ lubrication modification, isostatic-pressure-free short-process manufacturing is achieved, the manufacturing cost is reduced, and meanwhile the excellent comprehensive magnetic performance and mechanical performance of the magnet are guaranteed.

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.