215 results about "Terbium" patented technology

The invention provides a method for preparing a high-coercivity sintered neodymium-iron-boron magnet, and belongs to the technical field of rare earth permanent magnet material preparation, and the method comprises the following steps: 1, taking the sintered neodymium-iron-boron magnet as a base material, and removing an oxide layer through alkali washing deoiling, ultrasonic water washing and acid pickling cleaning; 2, taking the Pr-Dy-Cu-Ga quaternary alloy as a diffusion source, and cutting the Pr-Dy-Cu-Ga quaternary alloy into slices; 3, attaching the thin sheet to the surface of a base material for diffusion heat treatment; fourthly, low-temperature tempering is conducted; 5, testing a room temperature demagnetization curve of the sample; light rare earth Pr replaces a part of heavy rare earth Dy and is matched with Cu and Ga elements in a certain proportion to be smelted to obtain quaternary alloy, the quaternary alloy with low heavy rare earth serves as a diffusion source, the microscopic characteristics of the magnet are improved, grain boundary phase distribution is optimized, and under the condition that residual magnetism and the maximum magnetic energy product are slightly reduced, the coercive force of the sintered neodymium-iron-boron magnet is improved; and terbium and dysprosium are not used, so that the use amount of heavy rare earth elements and the production cost are reduced.

The invention provides luminescent lanthanide nanoparticles having simultaneously an improved brightness and an increased lifetime of the excited-state. These nanoparticles comprise terbium ions and ions of a second lanthanide, preferentially europium, and are coated with molecules of chromophore ligand bonded to the surface of the nanoparticle. The ligand is an organic molecule comprising at least one chromophore radical of formula (I) or of formula (II): wherein R is selected from H, CN group or COOH group. The phosphorescence excited-state lifetime is improved by energy transfer from surface terbium ions to core ions of the second lanthanide. The nanoparticle may further comprise a carrier molecule of analytical interest covalently attached to at least one ligand molecule.

A light-emitting device including an organometallic compound having a metal such as is platinum (Pt), palladium (Pd), copper (Cu), silver (Ag), gold (Au), rhodium (Rh), ruthenium (Ru), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), or thulium (Tm) is provided. The light-emitting device may include a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and comprising an emission layer. The light-emitting device may be included in an electronic apparatus.

A transparent ceramic material is manufactured by molding a source powder into a compact, the source powder comprising a rare earth oxide consisting of at least 40 mol % of terbium oxide and the balance of another rare earth oxide, and a sintering aid, sintering the compact at a temperature T (1,300° C.≤T≤1,650° C.) by heating from room temperature to T1 (1200° C.≤T1≤T) at a rate of at least 100° C. / h, and optionally heating from T1 at a rate of 1-95° C. / h, and HIP treating the sintered compact at 1,300-1,650° C. The ceramic material has improved diffuse transmittance in the visible region and functions as a magneto-optical part in a broad visible to NIR region.

Sensors containing one or more metal oxides as the sensor material are used for detecting pathogen-derived VOCs, e.g., VOCs emitting from infectious wounds. The metal oxides may contain one or more metal elements selected from aluminum, antimony, bismuth, boron, cerium, chromium, cobalt, copper, gold, indium, iridium, iron, lanthanum, lead, manganese, molybdenum, nickel, niobium, osmium, palladium, platinum, rhodium, ruthenium, selenium, silicon, silver, tantalum, tellurium, terbium, tin, titanium, tungsten, vanadium, ytterbium, yttrium, zinc, and zirconium. A sensor device may have one or more sensors, which detects and records a variety of VOCs that are indicative of existence of pathogens, and the pathogens are associated with dieses and / or infections.

The invention discloses a rare earth metal polymer with multiple stimulation responsiveness and a preparation method thereof, two monomers SP and VTPY are mixed with methyl methacrylate (MMA) according to a certain proportion, a polymer skeleton Poly (VTPY-co-SP-co-MMA) is prepared through a free radical polymerization reaction, the polymer and Tb (Com) 3.2 H2O are further subjected to a coordination reaction according to a specific proportion, and the rare earth metal polymer with multiple stimulation responsiveness is obtained. The Poly-Tb (Coum) 3 with the stimuli-responsive discoloration characteristic is prepared by the aid of the method. The rare earth metal polymer with methyl methacrylate as a framework and rare earth terbium ions and spiropyran monomers as double emission centers is synthesized, has multiple stimulation response characteristics, provides a brand new strategy and possibility for development of rare earth-based multifunctional intelligent materials, and has wide application prospects. An innovative solution is provided for development of a thermal enhanced rare earth luminescent material, the thermosensitive fluorescence response performance of the material is greatly improved, and a new thought is provided for design of an intelligent temperature response type rare earth luminescent material.

A sensor comprising one or more metal oxides as sensor material is used to detect pathogen-derived VOCs, such as those released from an infected wound. The metal oxides can comprise one or more metal elements selected from aluminum, antimony, bismuth, boron, cerium, chromium, cobalt, copper, gold, indium, iridium, iron, lanthanum, lead, manganese, molybdenum, nickel, niobium, osmium, palladium, platinum, rhodium, ruthenium, selenium, silicon, silver, tantalum, tellurium, terbium, tin, titanium, tungsten, vanadium, ytterbium, yttrium, zinc, and zirconium. The sensor device can have one or more sensors that detect and record various VOCs indicative of the presence of pathogens, which are associated with mortality and / or infection.

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 provides a method for manufacturing a terbium-dysprosium-iron giant magnetostrictive alloy based on three-dimensional photocuring molding, which comprises the following steps of: firstly, preparing three-dimensional photocuring molding slurry, adopting photosensitive resin as a matrix, and matching with a metal organic chelating agent containing terbium-dysprosium-iron giant magnetostrictive alloy component to enhance the uniform distribution of metal powder so as to ensure the printing precision and the material stability; secondly, the resin and the chelating agent are removed through heat treatment degreasing, the degreasing process is controlled by controlling the heating rate, and structural collapse is avoided; decarburization is carried out in a low-oxygen atmosphere, so that the purity of the alloy is improved, and the structural integrity before sintering is ensured; then reduction treatment is performed to improve the structural stability and purity; and finally, high-temperature sintering is carried out under the assistance of a magnetic field, grain orientation and magnetic domain arrangement are optimized, and the magnetostrictive effect and the force-magnetic energy conversion efficiency are improved. According to the method, three-dimensional light curing forming and magnetic field auxiliary heat treatment are combined, and the risk of structural damage in the printing process of the terbium dysprosium iron giant magnetostrictive alloy is practically and effectively avoided.

The invention discloses a diffusion source, a preparation method of the diffusion source and a processing method of a neodymium-iron-boron magnet. The diffusion source comprises aluminum or aluminum alloy foil, wherein rare earth element-containing particles, non-rare earth metal oxide and non-rare earth metal are attached to the upper surface and the lower surface of the aluminum or aluminum alloy foil respectively; the rare earth elements in the rare earth element-containing particles are selected from one or more of terbium, dysprosium, praseodymium and neodymium; the rare earth element-containing particles are selected from one or more of rare earth hydride particles, rare earth fluoride particles and rare earth metal particles; the non-rare earth metal oxide is selected from one or more of aluminum oxide and magnesium oxide; the non-rare earth elements in the non-rare earth metals are selected from one or more of copper, aluminum, magnesium, iron, zirconium, niobium and gallium. The diffusion source can reduce the use amount of rare earth elements and effectively improve the coercive force of the neodymium-iron-boron magnet.

The invention provides a sintered neodymium-iron-boron magnet and a preparation method thereof. The sintered neodymium-iron-boron magnet comprises a neodymium-iron-boron sintered body and a heavy rare earth layer, wherein the heavy rare earth layer comprises heavy rare earth and an oxide; part or all of the surface of the neodymium-iron-boron sintered body is covered by the heavy rare earth layer, and heavy rare earth is distributed in an area, at least 3.5 mm deep from the surface, of the neodymium-iron-boron sintered body covered by the heavy rare earth layer; the oxide is one or more of aluminum oxide, silicon oxide, calcium oxide, magnesium oxide, zirconium oxide, copper oxide and zinc oxide, and the heavy rare earth is one or more of dysprosium, terbium, holmium and gadolinium. At least one part of the surface of the neodymium-iron-boron sintered body is covered with the heavy rare earth layer containing the oxide, when the heavy rare earth is diffused at a high temperature, the heavy rare earth enters the neodymium-iron-boron sintered body, the oxide is high in melting point, relatively thick and left on the surface of the neodymium-iron-boron sintered body, the effect of a spacer is achieved, magnet adhesion can be effectively prevented when the heavy rare earth is diffused, and the service life of the magnet is prolonged. And the preparation of the magnet is more convenient, and industrial application is realized.

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.

To provide a TGG single crystal without a linear scatterer and achieve a high-performance optical isolator.SOLUTION: A TGG single crystal is grown into a crystal from the melt of a congruent composition by the Czochralski method. The oxide powder of a Tb and Ga compound as a single crystal raw material is used for obtaining the melt of the congruent composition; in the TGG single crystal represented by a chemical-formula Tb(3+x) Ga(5-x) O12, 0.00<X<0.08 is preferable; the crystal growth from the melt of the congruent composition can reduce excess vacancies causing a linear scatterer and suppress the occurrence of the linear scatterer in the TGG single crystal; and the lattice constant measurement of the grown TGG single crystal can verify the melt of the congruent composition.SELECTED DRAWING: Figure 2

The invention relates to a lanthanide oxide electrochemiluminescence aptamer sensor with dual signal amplification for detecting acetamiprid as well as a preparation method and application of the lanthanide oxide electrochemiluminescence aptamer sensor. According to the sensor, terbium-doped europium oxide (Eu2O3: Tb < 3 + >) modified by gold nanoparticles (Au NPs) is used as a luminous body, and the electrochemical luminescence performance can be remarkably improved through multiple mechanisms: on one hand, the Au NPs can effectively promote generation of more sulfate free radicals; on the other hand, the surface defect passivation effect and the efficient synergistic effect of energy transfer jointly achieve effective amplification of signals. In addition, the wool ball-shaped Ag NPs is used as a plasma resonance signal amplification source, so that the ECL intensity of the sensor is further enhanced. The prepared electrochemical luminescence sensor with the dual signal amplification effect is used for detecting acetamiprid (ACE), has a wide linear range and a low detection limit, and has a wide application prospect in detection of acetamiprid residues in a water environment.

The invention relates to the technical field of architectural ceramics, in particular to golden yellow metal dry granular glaze and a preparation method and application thereof.The preparation method comprises the following steps that A, under the inert atmosphere, copper simple substances, aluminum simple substances, zinc simple substances, tin simple substances, chromium simple substances and terbium simple substances are completely molten, and copper alloy liquid drops are obtained after liquid breaking; cooling the copper alloy liquid drops in a natural environment to obtain copper alloy dry particles; b, uniformly mixing kaolin, quartz, calcite, dolomite, barium carbonate and zinc oxide, calcining, quenching with water, grinding and sieving to obtain a crystalline frit; and C, uniformly mixing the copper alloy dry granules, the crystalline frit and the suspending agent to obtain the golden yellow metal dry granular glaze. The preparation method of the golden yellow metal dry granular glaze is high in operability, and on the premise that the golden yellow metal texture effect is uniform, the golden yellow metal dry granular glaze can have the excellent golden yellow metal texture effect, transparency and antifouling performance at the same time and also has high abrasion resistance and hardness.

The invention belongs to the field of lubricants, and relates to a composite solid lubricant for a sprocket shaft group and a preparation method thereof. The composite solid lubricant for the sprocket shaft group is prepared from the following raw materials in percentage by weight: 2-15% of graphite fluoride, 1-4% of terbium-thulium co-doped molybdenum disulfide, 1-3% of organic graphene, 0.07-0.4% of tin powder, 1-11% of polyethylene glycol, 1-7% of a thickening agent and the balance of basic lubricating oil. According to the preparation method, molybdenum disulfide is co-doped with rare earth thulium and terbium, thulium and terbium ions are embedded into molybdenum disulfide layers or replace molybdenum sites through electrostatic adsorption in the hydrothermal reaction process, the layered structure is more compact, oxygenolysis of molybdenum disulfide at high temperature is effectively inhibited, and better oxidation resistance is achieved. The talcum powder is introduced to modify the lithium-based soap, and zinc ions are adopted to modify the talcum powder, so that the dispersibility of the talcum powder is improved, and the thermal stability, wear resistance and water resistance of the lubricant are improved after the talcum powder is compounded with the lithium-based soap.

A method for producing a coated chromium-containing component includes providing a coating mixture of a solvent and a source of praseodymium and / or a source of terbium, contacting the surface of the component with the coating mixture, optionally drying, and heating the component in an oxidising atmosphere at a temperature of 450° C. or higher. Examples include coated components for a device, and electrochemical devices with coated components, the components having a surface coating including at least one layer that includes a praseodymium material and / or terbium material. The method produces coatings that reduce chromium evaporation and are useful as barriers on a chromium-containing components.

The present invention relates to the field of magnetic functional materials. The present invention discloses a use of a rare earth fluoride single crystal in magnetic refrigeration, a magnetic refrigeration method and a magnetic refrigeration device. A magnetocaloric material of the series is lithium rare earth fluoride, with the chemical formula of LiREF4, wherein RE is one or more of rare earth elements gadolinium, terbium, dysprosium, holmium, erbium, thulium and ytterbium. A magnetocaloric material single crystal of the series has extremely strong magnetic anisotropy. By applying a varying magnetic field of 0-20 kOe along the easy magnetization axis direction of the magnetocaloric material, LiGdF4, LiTbF4, LiHoF4, LiDyF4, LiErF4, LiYbF4 and LiTmF4 obtained isothermal magnetic entropy changes of 50.35 J·kg−1·K−1, 21.12 J·kg−1·K−1, 24.98 J·kg−1·K−1, 24.45 J·kg−1·K−1, 21.95 J·kg−1·K−1, 14.7 J·kg−1·K−1 and 0.692 J·kg−1·K−1, respectively, at 1.8K, 4K, 4K, 1.8K, 1.8K, 1.8K, and 18K. Wherein, the thermal conductivity of LiTbF4 and LiErF4 reaches 50 W·K−1·m−1 at 25K.

The invention relates to the technical field of tungsten alloy materials, in particular to a tungsten alloy wire and a preparation method and application thereof.The tungsten alloy wire is composed of, by mass, 0.4-1.1 wt% of L, 0.001-0.01 wt% of X, 0.001-0.25 wt% of Z and the balance tungsten and inevitable impurities; wherein L is one or more than two of lanthanum, cerium, praseodymium, neodymium, gadolinium and erbium; x is one or more than two of lutetium, europium, ytterbium, dysprosium, holmium, terbium and samarium; the Z comprises oxygen; the wire rod has a wire diameter of 20-60 [mu] m, the wire rod contains a linear L or L compound in the axial direction, and the average radial width D of the L or L compound is less than or equal to 5 nm. According to the tungsten alloy wire, the linear element L is doped between the tungsten matrixes, the radial average width of L is controlled to be smaller than or equal to 5 nm, the wire diameter of the wire can range from 20 micrometers to 60 micrometers, the tensile strength of 5000 MPa or above can be achieved under the wire diameter of 60 micrometers, and the machining performance of the tungsten alloy wire is enhanced.

The invention relates to the field of optical thin films, and particularly discloses a preparation method of an ultra-wide-angle low-reflection composite nanostructure optical thin film, which comprises the following steps: S1, cleaning the surface of a glass substrate, and then carrying out laser etching treatment to obtain etched glass; s2, putting the etched glass into a melamine solution, heating to 780-800 DEG C, treating for 30-40 minutes, and cooling to obtain nitrogen-doped glass; treating the surface with boric acid and ammonia gas to obtain a semi-finished product; s3, coating the surface of the semi-finished product with a rare earth terbium modified silicon dioxide layer to obtain a finished product; the optical thin film has the advantages of ultra-wide angle, low reflectivity and high transmissivity.

The invention is suitable for the technical field of heat treatment, and provides a metal deep ion nitriding heat treatment process which comprises the following steps: (a) preparing a quantum dot catalyst layer; (b) acoustic resonance plasma treatment; (c) magnetic field enhanced diffusion; (d) carrying out grain boundary passivation treatment; according to the preparation method, Fe3O4 (at) Gd quantum dots are deposited on a nanocrystallization surface, an electron conduction channel is provided by utilizing a Fe3O4 carrier, N2 molecules are captured by Gd < 3 + > through physical adsorption, unpaired electrons are injected into a pi orbit of the N2 molecules, so that N is equivalent to N bond energy is reduced, and the layer permeation time is shortened; the plasma sheath oscillation frequency is matched with the inherent frequency of the workpiece, acoustic resonance is excited, and the plasma penetration depth is increased; plasma forms a standing wave field on the surface of a workpiece, and the uniformity deviation of an infiltrated layer is reduced. The strong magnetic field perpendicular to the electric field is applied, so that electrons do spiral motion, the collision ionization probability is increased, and the deep nitrogen concentration is improved; through reaction of terbium steam and grain boundary impurities, a brittleness source is eliminated, and the impact toughness is improved.

The inventors have developed technology to improve the generation of daughter isotopes for clinical treatments. The technology includes systems and methods for using a liquid target to deliver parent isotopes to a reactor for neutron bombardment and subsequently separating desired daughter isotopes from the liquid target. According to an aspect of the technology described herein, a method of obtaining desired daughter isotopes comprises pumping a liquid target solution comprising a parent isotope through a fluid path that includes a first portion that passes through a fission reactor, a second portion that passes through a pump, and a third portion that passes through an isotope capture device.

The invention discloses a preparation method of an Eu-Tb-In-MOF material based on a dual fluorescence emission source type, and the preparation method specifically comprises the following steps: under a closed condition, uniformly mixing terbium nitrate hexahydrate, europium nitrate hexahydrate, indium nitrate pentahydrate, an organic ligand, N, N-dimethylformamide and acetonitrile, then adjusting the pH value of a mixed solution, and carrying out solvothermal reaction, washing, filtering and drying to obtain the Eu-Tb-In-MOF material. The invention also discloses an application of the Eu-Tb-In-MOF material in identification of heavy metal ions Cr in a water environment. The Cr (VI) ions in the water environment are detected through fluorescence quenching sensing, excellent high selectivity is shown, and interference of other single and mixed anions and cations in the water environment can be resisted.

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 invention proposes a method for manufacturing a TbDFe supermagnetic alloy based on stereolithography. The method first prepares a stereolithography slurry using a photosensitive resin as a matrix. A metal-organic chelating agent containing TbDFe supermagnetic alloy components is added to enhance the uniform distribution of the metal powder, ensuring printing accuracy and material stability. Next, degreasing is performed to remove the resin and chelating agent through heat treatment. The degreasing process is controlled by controlling the heating rate to avoid structural collapse. Decarburization is then performed in a low-oxygen atmosphere to improve the purity of the alloy and ensure structural integrity before sintering. A reduction treatment is then performed to improve structural stability and purity. Finally, high-temperature sintering is performed under the assistance of a magnetic field to optimize grain orientation and magnetic domain arrangement, thereby enhancing the magnetostrictive effect and force-to-magnetic energy conversion efficiency. This method combines stereolithography with magnetic field-assisted heat treatment, effectively avoiding the risk of structural damage during the printing of TbDFe supermagnetic alloy.

To provide a multilayer ceramic capacitor having an excellent characteristic of a reliability variation and a manufacturing method of them.SOLUTION: A multilayer ceramic capacitor according to an embodiment, contains: a capacitor body containing a dielectric layer and an internal electrode layer; and an external electrode that is arranged to an outside of the capacitor body. The dielectric layer contains a plurality of dielectric crystal grains, each dielectric crystal grain contains a core part and a shell part surrounding at least one part of the core part, and the shell part contains: a main component of a barium titanate system containing barium (Ba) and titanium (Ti); and a rare earth element (R) containing dysprosium (Dy), terbium (Tb), yttrium (Y), La (lanthanum), or a combination of them. A R / Ba atom ratio variation coefficient (CV) obtained by a formula 1 in the shell part and a R / Ti atom ratio variation coefficient (CV) exceeds 0 and is less than 0.19.SELECTED DRAWING: Figure 4

Method (100) for forming a magnet (10), wherein the method (100) comprises: Forming a slurry (20) comprising magnetic powder material, binder material, and a solvent; Producing a first crude layer (14a') from the slurry (20), wherein the first crude layer (14a') is viscous and flowable; Applying a magnetic field (24) to the first raw layer (14a') to align the magnetic powder material contained in the first raw layer (14a') in a desired direction; Hardening of the first raw layer (14a') to form a hardened first layer (14a) by focusing a laser beam (28) on sections of the first raw layer (14a') that are to be part of the magnet (10) while the magnetic field (24) is applied to the first raw layer (14a'); after the first raw layer (14a') has hardened, a second raw layer (14b') is produced from the slurry (20) in contact with the hardened first layer (14a), wherein the second raw layer (14b') is viscous and flowable; Applying a magnetic field (24) to the second raw layer (14b') to align the magnetic powder material contained in the second raw layer (14b') in the desired direction; Curing the second raw layer (14b') to form a cured second layer (14b) by focusing a laser beam (28) on sections of the second raw layer (14a') that are to be part of the magnet (10) while the magnetic field (24) is applied to the second raw layer (14b'), whereby the cured second layer (14b) adheres to the cured first layer (14a); wherein the generation of the slurry (20) comprises homogeneously mixing the magnetic powder material and the binder, wherein the method (100) further comprises: Providing the magnetic powder material comprising at least one rare earth metal selected from neodymium, iron and boron, and at least one from dysprosium and terbium; Providing the binder, which is organic and comprises at least one of: polyvinyl alcohol (PVA), stearic acid, carnauba wax, phenolic resin, epoxy resin, nylon, polypropylene, polystyrene and poly(methyl methacrylate) (PMMA); Providing the slurry (20) with a viscosity of less than 10 Pascal-seconds; Sintering of the cured first and second layers (14a, 14b); and The cured first and second layers (14a, 14b) are subjected to an isostatic hot pressing (HIP) process.

The invention provides a nano rare earth oxide as well as a preparation process and application thereof, and relates to the technical field of nano materials. The nano rare earth oxide is prepared from the following raw materials: rare earth ions, chitosan-hexadecyl trimethyl ammonium bromide, tea saponin, nano cellulose and a hydroxyapatite nano rod; the rare earth ions are selected from at least one of cerium ions Ce < 3 + >, yttrium ions Y < 3 + >, samarium ions Sm < 3 + >, terbium ions Tb < 3 + >, lanthanum ions La < 3 + >, praseodymium ions Pr < 3 + > and neodymium ions Nd < 3 + >. The prepared nano rare earth oxide can be used as an independent antibacterial agent, can also be used as a functional filler to be compounded with a polymer, and has application potential in the fields of medical instrument coatings, food packaging and the like.

The invention relates to a polycrystalline fused product of formula (Sc2O3)yAx(ZrO2 + HfO2)1-x-y, with 0.030 ≤ y ≤ 0.150, and 0.000 ≤ x ≤ 0.070, and x ≤ y, A denoting an additive selected from Y2O3, Al2O3, CeO2, Yb2O3, Gd2O3, MnO, Bi2O3, La2O3, Pr2O3, Nd2O5, Sm2O3, Eu2O3, Tb4O7, Ta2O5, Nb2O5 and mixtures thereof, ZrO2 + HfO2 + Sc2O3 + A representing more than 98% of the mass of the fused product, MnO expressing the total content of manganese oxides expressed in the form MnO, Pr2O3 expressing the total content of praseodymium oxides expressed in the form Pr2O3, Nd2O5 expressing the total content of neodymium oxides expressed in the form Nd2O5, Tb4O7 expressing the total content of terbium oxides expressed as Tb4O7, Ta2O5 expressing the total content of tantalum oxides expressed as Ta2O5, and Nb2O5 expressing the total content of niobium oxides expressed as Nb2O5.

The invention discloses a multicolor stress luminescent material for handwriting anti-counterfeiting and a preparation method thereof, the chemical general formula is Lu3-xAl2Ga3O12: xTb < 3 + >, 0.25% < = x < = 3.0%; the crystal structure is an Ia-3d cubic system, and the active ion is Tb < 3 + >. The preparation method comprises the following steps: weighing a lutetium-containing compound raw material, an aluminum-containing compound raw material, a gallium-containing compound raw material and a terbium-containing compound raw material, grinding and uniformly mixing to obtain a mixture, presintering, heating and calcining, cooling to room temperature, and grinding to obtain the terbium ion-doped multicolor stress luminescent material. The terbium ion-doped multicolor stress luminescent material disclosed by the invention has good stress luminescence self-recovery performance, shows different responses of energy level transition to stress in a visible light range, and is adjustable in color. The material has a low-threshold excitation characteristic, can provide multicolor stress luminescence response, and meets multicolor anti-counterfeiting requirements under different stress conditions.