144 results about "Samarium" patented technology

The invention discloses a rare-earth metal arylamine group compound as well as preparation method and application thereof. The invention discloses the rare-earth metal arylamine group compound which is characterized in that a general formula of the rare-earth metal arylamine group compound is (2,6-R12PhNH)5LnLi2(THF)2, wherein Ln is a rear-earth metal selected from one of neodymium, samarium, ytterbium or yttrium; R1 is selected from one of hydrogen, methyl or isopropyl. The rare-earth metal arylamine group compound has the advantages that the rare-earth metal arylamine group compound has a definite structure; raw materials used in the preparation method are simple, easily obtained and cheap; the reaction process is simple and easily operated; the rare-earth metal arylamine group compound product is conveniently purified and the yield of the product is high; the rare-earth metal arylamine group compound has a high activity when acting as a single component catalyst to catalyze a hydrogen phosphine reaction of aldehyde or ketone and phosphite ester; the use amount of the catalyst is less; the yield is high; a substrate has wide universality; a new and simple method is provided for synthesis of a-hydroxyphosphonate.

The invention discloses a preparation method and application of samarium-doped lanthanum ferrite nanofibers, and the preparation method is a design thought based on synergistic interaction of'defect engineering 'and'morphology control': samarium (Sm) ions with a specific proportion are creatively introduced to the A site of LaFeO3, and lattice distortion is induced by utilizing radius mismatch between the samarium (Sm) ions and lanthanum (La) ions; therefore, high-concentration gas-sensitive active sites (oxygen vacancies) are generated in the intrinsic structure of the material; and the material is constructed into a one-dimensional nanofiber network with a high specific surface area through an electrostatic spinning technology, so that the exposure efficiency of active sites is maximized.

The invention discloses a multi-band high-stability ferrite magnetic material composite formula and a preparation process, and relates to the technical field of magnetic materials. The ferrite magnetic material composite formula comprises 38-42 parts of ferric oxide powder, 37-41 parts of ferroferric oxide powder, 6-12 parts of graphene nanosheets, 5-7 parts of hydroxypropyl methyl cellulose, 6-9 parts of lanthanum oxide, 4-6 parts of scandium oxide, 1-3 parts of nano titanium dioxide, 4-6 parts of bismuth magnesium boron, 9-13 parts of ferric sulfate, 3-5 parts of manganese sulfate, 4-6 parts of zinc sulfate, 2-4 parts of copper sulfate and 2-3 parts of samarium sulfate. By utilizing a physical vapor deposition gradient doping process, the problems that an existing ferrite magnetic material is single in electromagnetic performance, cannot stably and efficiently work in a multi-frequency-band complex electromagnetic environment and cannot meet the requirements of the fields of communication, radar, electronic countermeasure and the like for wide-frequency-band and high-performance magnetic materials can be solved.

This invention discloses a samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal material, its preparation method, and its applications. The samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal material belongs to the monoclinic crystal system, has a space group of Cm, and a chemical formula of Sm. 0.3 La 0.1 :Y 0.6 Ca4O(BO3)3 has a second harmonic response intensity of 0.89 × KDP, and exhibits transmittance exceeding 80% in the 500–1000 nm and 1600–2400 nm wavelength ranges. It also has a strong absorption peak in the 1000–1600 nm wavelength range. Therefore, the samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal can be considered as a nonlinear optical crystal material with broad application prospects in the field of optics.

The application discloses a magnet material, a preparation method thereof and a samarium-cobalt magnet material. The preparation method of the magnet material comprises the following steps: hydrogen absorption, airflow grinding, press forming, hydrogen blowing, dehydrogenation and decarburization reaction and sintering of an alloy sheet; a compact is obtained after the press forming; hydrogen is contained in an atmosphere for the airflow grinding treatment; when the hydrogen blowing treatment is performed, the mass ratio of the compact to hydrogen is 10:(0.5-1), and the hydrogen flow is 0.05-0.2 kg / h; the dehydrogenation and decarburization reaction is performed under the condition that the temperature is continuously raised to T, and T is 580-720 DEG C; the continuous temperature rising comprises a first stage and a second stage; the first stage is that the temperature is raised from T0 to T1, and T1 is 400-500 DEG C; the second stage is that the temperature is raised from T1 to T. The carbon content of the magnet material prepared by the application is 50-300 ppm, and the magnet material can further improve the coercive force while maintaining a high remanence.

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 technical field of desulfurizing agents, in particular to a reusable iron oxyhydroxide desulfurizing agent and a preparation method thereof. The problem that the activity of a traditional material is reduced due to sulfate accumulation and compact layer formation in a vulcanization-regeneration cycle is solved. The preparation method comprises the following steps: dissolving ferric nitrate and urea, adjusting the pH value to 1.8, and adding cerous nitrate and citric acid; heating, introducing zirconium oxynitrate, controlling the pH value at 3.7-3.9 for 2-3 hours, heating to 7.2, adding samarium nitrate and zirconium acetylacetonate, aging, and mixing with bentonite and ammonium bicarbonate for molding; and finally, carrying out segmented activation in a nitrogen and low-oxygen mixed atmosphere. The desulfurizer has high specific surface area and pore volume, the breakthrough sulfur capacity reaches 148-160mgS / g, the 10-time circulating sulfur capacity retention rate is 88-91%, and the desulfurizer is high in particle compressive strength, low in abrasion rate and suitable for the industrial desulfurization process.

The invention relates to an embedded heat stabilizer for PVC (polyvinyl chloride) as well as a preparation method and application of the embedded heat stabilizer, which can be applied to the field of downstream processing and application of PVC. The preparation method comprises the following steps: firstly, synthesizing a Zn-Sm structure precursor with a hydrotalcite structure through a hydrothermal method, and then carrying out modification treatment through stearic acid to synthesize the Zn-Sm embedded type heat stabilizer. The thermal stabilizer has a relatively better structure and more active centers, so that the adsorption and conversion of HCl in the PVC thermal decomposition process are facilitated, the oxidation resistance is improved through the efficient synergistic effect of rare earth elements samarium and zinc which are introduced into a plurality of orbits and have larger radiuses, and the zinc burning phenomenon caused in the PVC thermal decomposition process is prevented.

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 invention relates to the field of refractory materials, in particular to a high-erosion-resistance refractory material based on boron nitride modification and a preparation method of the high-erosion-resistance refractory material. The problem that an existing refractory material is poor in erosion resistance is solved. The refractory material is prepared by taking zirconium dioxide, silicon dioxide, calcium oxide, ferric oxide and aluminum oxide as matrixes and adding samarium lanthanum magnesium aluminum composite gel powder and boron nitride loaded chromium sesquioxide, magnesium nitrate, aluminum nitrate, samarium nitrate, lanthanum nitrate and citric acid form gel, high-temperature treatment is performed to obtain the samarium lanthanum magnesium aluminum composite gel powder, and the samarium lanthanum magnesium aluminum composite gel powder is added to the boron nitride loaded chromium sesquioxide. Boron nitride is loaded with chromium sesquioxide after being treated by tannic acid, the corrosion resistance of the material is enhanced through the synergistic effect of all the components, and the material is suitable for high-temperature furnaces, high-temperature reactors and other industrial environments needing high-temperature resistance and high corrosion resistance.

The application discloses a sintered samarium-cobalt magnet and a preparation method and application thereof, and relates to the field of rare earth permanent magnet materials. A structural general formula of the sintered samarium-cobalt magnet is Sm g RE h (Fe a Cu b Zr c M d Co e ) f , RE includes at least one of Pr, Er, Ce, Nd, La and Dy, and M includes at least one of Al, B, Ti, Nb and Mn. The application is helpful to inhibit the volatilization of rare earth and promote the formation of a uniform phase structure of a solid solution state magnet, is favorable to the formation of a cellular structure and the reasonable segregation of Cu / Fe elements, and effectively realizes the uniform precipitation of 1:5H cell wall phases and the control of the growth behavior of 2:17R cellular phases in the iron-rich samarium-cobalt magnet through the synergistic regulation of stress-assisted solid solution, so that the sintered samarium-cobalt magnet with high remanence, high coercivity and high magnetic energy product is ensured.

This invention relates to the field of denitrification catalyst technology, and in particular to an arsenic- and alkali-poisoning-resistant denitrification catalyst and its preparation method. The denitrification catalyst comprises: a support, an active component, and a co-catalyst; the mass ratio of the active component to the support is (3-15):100; the mass ratio of the co-catalyst to the support is (3-8):100; the support comprises: calcium-based bentonite, attapulgite, and nano-cerium oxide; the active component is an oxide of vanadium, chromium, samarium, or niobium; and the co-catalyst is one or more oxides of molybdenum, tungsten, or praseodymium. This invention prepares a multi-component mesoporous composite oxide denitrification catalyst with excellent resistance to arsenic and alkali metal poisoning through multiple steps, solving the problem of poor arsenic and alkali resistance in traditional denitrification catalysts. It is suitable for nitrogen oxide emission control under flue gas conditions in coal-fired power plants, biomass boilers, and the glass industry.

A luminescent material is a complex with the following structural formula: wherein R and R' are independently selected from oxygen, amino, C1-C18 straight-chain or branched alkyl-substituted amino, phosphin, C1-C18 straight-chain or branched alkyl-substituted phosphin, sulfur, and selenium; R1, R2, R3, R4, R5, and R6 are independently selected from hydrogen, C1-C18 straight-chain or branched alkyl or halogen-substituted C1-C18 straight-chain or branched alkyl, aromatic... Aromatic groups such as benzene, thiophene, and furan, n = 1–3, are used to construct cyclic ligand skeletons with different half-ring numbers. Ln is one of the following: cerium trivalent ion, europium divalent ion, ytterbium divalent ion, and samarium divalent ion. M is one of the following: manganese divalent ion, cobalt trivalent ion, chromium trivalent ion, vanadium trivalent ion, and ferric trivalent ion. X is a monovalent ion, such as halogen, cyanide, thiocyanate, isothiocyanate, etc., m = 0–3, l = 3–6. X acts as a monodentate ligand or as a bridging bidentate ligand.

The invention belongs to the technical field of permanent magnet materials, and relates to a preparation method of a high-strength and high-toughness samarium-cobalt permanent magnet, which comprises the following steps: burdening, smelting, pulverizing, orientation forming, cold isostatic pressing, sintering, solid solution and aging treatment. The aging treatment comprises the following steps: under the protection of inert gas, carrying out primary heat treatment at 780-880 DEG C for 500-1500 minutes, then closing the inert gas, cooling to 200-500 DEG C, carrying out secondary aging treatment, carrying out heat preservation for 30-600 minutes, applying an external magnetic field, and finally cooling to room temperature. According to the method, an external magnetic field is added during secondary aging, gas protection is cancelled, the gas cost is reduced, and meanwhile, the mechanical property of the samarium-cobalt magnet is greatly improved under the condition that it is guaranteed that the magnetic property is basically unchanged.

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.

The present application relates to a kind of high thermal stability deep red fluorescent material, preparation method and LED light source.The fluorescent material is La2O3-MgO-A2O5-Sm2O3 system, wherein A is selected from one or more combinations of Nb, Ta or Sb;The molar ratio of La:Mg:A:Sm in the La2O3-MgO-A2O5-Sm2O3 system is (1.9-1.99):1:1:(0.01-0.1).Preparation method is: proportionally weigh La source compound, Mg source compound, A source compound and samarium source compound, grind and mix each raw material, then primary sintering is carried out, to obtain precursor;The precursor is secondly ground and mixed, then secondary sintering is carried out, to obtain the deep red fluorescent material.Compared with prior art, the deep red fluorescent material of the present application can effectively absorb 400-410nm wavelength violet light, and emit strong red light with center wavelength at 650nm, which can be well matched with violet chip to package and prepare LED light emitting device.

The application belongs to the technical field of permanent magnet materials, and relates to a preparation method of a high-mechanical-property samarium-cobalt permanent magnet, which comprises the following steps: sequentially subjecting raw materials to smelting, powdering, orientation forming, cold isostatic pressing, sintering, solid solution, aging, and heat treatment to obtain a samarium-cobalt permanent magnet; the heat treatment is performed under the protection of an inert atmosphere, the number of heat treatments is 1-10, an external magnetic field and an external stress are applied to one or more heat treatments; the magnetic field strength of the external magnetic field is 1-50 kOe, and the size of the external stress is 5-500 MPa. After the aging process is completed, the heat treatment of the external magnetic field and the external stress is performed again, compared with a traditional process, the mechanical property of the samarium-cobalt magnet is greatly improved while the magnetic property is improved, and the magnetic-force property of the samarium-cobalt magnet is synergistically improved.

Olefin compounds can be produced by a method that can include passing a feed stream into a reactor, where the feed stream includes one or more hydrocarbons; and passing an oxygen carrier material into the reactor. In the reactor, the one or more hydrocarbons can be dehydrogenated to form hydrogen gas and one or more olefin compounds, and at least a portion of the hydrogen gas can react with oxygen gas from the oxygen carrier material to produce water. At least 95 wt% of the oxygen carrier material can consist of: 1 mole fraction of iron; 0 mole fraction to 1 mole fraction of a combination of one or more of strontium, calcium, magnesium, titanium, lanthanum, cerium, praseodymium, neodymium, samarium, or yttrium; 1 mole fraction to 20 mole fraction of silicon dioxide; and 1 mole fraction to 3 mole fraction of oxygen gas not included in the silicon dioxide.

The invention discloses a method for ultrafast degrading organic pollutants by using a samarium niobate-carbon composite powder material. Organic pollutants in the solution are used as treated objects; and a samarium niobate-carbon composite powder material is used as a catalyst for treatment. The preparation method comprises the following steps: firstly, adding a composite powder material into a solution containing organic pollutants to prepare a liquid-solid mixed solution; then, stirring the liquid-solid mixed solution; after a period of time, organic pollutants in the solution are completely degraded. The method is simple and reliable, and the degradation speed is ultra-high.

Described herein is a chalcogen-halide solid electrolyte material represented by the following chemical formula: LiA x E y G z , or NaA x E y G z . In embodiments, A denotes one or more elements selected from the group consisting of magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), Lanthanum (La), cerium (Ce), samarium (Sm), and boron (B). In embodiments, E denotes one or more chalcogen elements. In embodiments, G denotes one or more halide elements. In embodiments, the following mathematical formula is satisfied: 0<x<10, 0<y<10, z=nx-2y+1, wherein n=3 when A denotes at least one element selected from the group consisting of La, Ce, Sm, and B, and n=2 when A denotes at least one element selected from the group consisting of Mg, Ca, Sr, and Ba. In embodiments, A is a single element selected from the group consisting of Mg, Ca, Sr, Ba, La, Ce, Sm, or B.

The application discloses a kind of samarium iron alloy, samarium iron nitrogen permanent magnet material and manufacturing method, application.The manufacturing method of the samarium iron alloy includes the following steps: (1) in protective atmosphere A, mixture A is treated by first heat preservation, and mixture B is obtained;The temperature of the first heat preservation is 800-950 DEG C;The time of the first heat preservation is 1-5 hours;The mixture A includes Sm2O3, Fe and Ca;(2) in protective atmosphere B, the mixture B is treated by second heat preservation, and the samarium iron alloy is obtained;The temperature of the second heat preservation is 1050-1180 DEG C;The time of the second heat preservation is 2-10 hours.The samarium iron nitrogen magnetic powder prepared in the application has the characteristics of low iron impurity content, low calcium and oxygen content, and high magnetic performance.Moreover, the manufacturing method of the application is efficient, low-cost, simple to prepare, and can use large-size porous iron powder, with low material cost.

The invention provides a samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring, and belongs to the field of gas sensors.The potential type carbon monoxide sensor comprises a YSZ substrate, a reference electrode and a sensitive electrode, the reference electrode and the sensitive electrode are arranged on the two sides of the YSZ substrate respectively, and the sensitive electrode comprises a sensitive electrode slurry layer and a Pt metal layer; the Pt metal layer is arranged between the YSZ substrate and the sensitive electrode slurry layer; the sensitive electrode slurry layer is prepared by screen printing of sensitive electrode slurry, the sensitive electrode slurry is prepared by mixing a samarium manganate material and an adhesive, and the samarium manganate material is SmMn2O5 powder. The samarium manganate material in the samarium manganate-based carbon monoxide sensor for carbon emission reduction and safety monitoring has relatively good electrocatalytic activity and relatively high carbon monoxide response speed, sensitivity and selectivity, so that the sensor can detect the concentration of low-concentration carbon monoxide in real time, and the response of the sensor to detected gas is remarkably improved; and large-scale popularization and application are facilitated.

This application provides a raw material for samarium-doped lead magnesium niobate single-crystal growth, its manufacturing process, and a samarium-doped lead magnesium niobate single-crystal. The chemical composition of the raw material for samarium-doped lead magnesium niobate single-crystal growth is Sm x Pb (1-1.5x) [(Mg 1 / 3 Note 2 / 3 ) 0.70 Ti 0.30]O3, where 0.005 ≤ x ≤ 0.02. The manufacturing process provided in this application comprises: the production of abrasive spheres from Sm2O3 in the millimeter range, sphere grinding with the Sm2O3 abrasive spheres and adjustment of the sphere grinding parameters, and a two-stage post-sintering treatment to obtain a single-crystal raw material for Sm-PMNT growth. In lead magnesium niobate, a sufficient amount of Sm2O3 can be uniformly doped to obtain a single-crystal raw material for Sm-PMNT growth with a uniform component distribution. Crystal growth carried out using the single-crystal raw material for Sm-PMNT growth produced by the manufacturing process of this application can improve the quality and piezoelectric properties of the crystal.

This invention relates to a method for improving the machining quality and yield of samarium cobalt magnets, belonging to the field of precision machining technology for rare earth permanent magnet materials. The method includes: crystal orientation detection and determination of the free-cutting direction, directional compensation cutting, segmented temperature-controlled precision grinding, stepped vacuum stress relief treatment, and online closed-loop detection. Through five-segment coordinated control, the dimensional accuracy reaches ±0.003mm, the chipping and cracking defect rate is less than 0.5%, and the yield is increased to over 98%.

The invention relates to the technical field of X-ray detection scintillator materials, in particular to a samarium-doped halide scintillation film for X-ray-near-infrared cooperative imaging and a preparation process thereof, and the preparation process comprises the following steps: S1, adding CsEu1-xSmxI3 (x is greater than 0 and less than or equal to 0.1) crystal powder into PMMA, adding an interface modifier, and fully stirring to obtain a mixture A; s2, acetone is added into the mixture A, tannic acid and an auxiliary modifier are added after magnetic stirring, ultrasonic treatment is conducted, and a solution B is obtained; and S3, dispensing the solution B on a pretreated substrate, airing at 25-30 DEG C, and after the solution is volatilized, obtaining the samarium-doped halide scintillation film for X-ray-near infrared cooperative imaging. According to the preparation process of the halide scintillation film, the film-forming carrier resin with PMMA as the core is matched with the efficient dissolving and dispersing effect of the acetone solvent, the simple and controllable dispensing film-forming process is adopted, reaction at high temperature is not needed, and the preparation method is simple, green, low in toxicity and low in cost.

The invention provides a method for preparing a samarium-cobalt permanent magnet material based on pre-aging treatment, and relates to the technical field of samarium-cobalt permanent magnet materials. The invention discloses a method for preparing a samarium cobalt permanent magnet material based on pre-aging treatment. The method comprises the steps of precursor preparation, solution treatment, pre-aging treatment, rapid cooling, main aging treatment and the like. Through pre-aging treatment, segregation of solute atoms is promoted at low temperature, high-concentration point defects are formed, uniform and high-density nucleation sites are provided for main aging Sm (Co, Cu) 5 cell wall phase precipitation, precipitation kinetics is accelerated, a nano cellular structure is refined, fine regulation and control of a microstructure are achieved, and the mechanical properties of the Sm (Co, Cu) 5 are improved. The intrinsic coercive force of the magnet is remarkably improved, the residual magnetism and the maximum magnetic energy product of the magnet are synergistically improved, and the prepared samarium-cobalt permanent magnet material is higher in cell wall density, more uniform in distribution and more excellent in comprehensive magnetic performance.

The application relates to the technical field of catalytic combustion of ethane, and discloses a preparation method and application of a catalytic combustion catalyst for ethane, which comprises the following steps: (1) dissolving chloroplatinic acid, a transition metal M1 nitrate and a rare earth metal M2 nitrate in water to obtain a mixed salt solution; and dripping the mixed salt solution into a molecular sieve carrier to perform impregnation, so as to obtain a solid A; (2) pre-drying the solid A, and then continuously drying after temperature rising, so as to obtain a powder B; and (3) performing aerobic calcination on the powder B, so as to obtain a catalyst; the catalyst is PtM1M2 / S, wherein M1 is one or more of iron, cobalt, nickel, manganese and copper, M2 is one or more of cerium, lanthanum, scandium, yttrium and samarium, and S is a molecular sieve carrier. The rare earth metal and the transition metal are synergistically doped, a strong interaction is formed between the rare earth metal and the transition metal and the noble metal platinum, the activation of ethane can be effectively enhanced, the reaction temperature can be reduced, and the conversion rate and stability of ethane can be improved.

Provided are Sm-Fe-N-based magnetic powder having high squareness, a Sm-Fe-N-based sintered magnet, and methods for producing the Sm-Fe-N-based magnetic powder and Sm-Fe-N-based sintered magnet. The Sm-Fe-N-based magnetic powder: contains particles containing samarium, iron, and nitrogen, and does not contain particles of an oxide of samarium having a particle diameter of 0.1 μm or more; or the number ratio of particles of an oxide of samarium having a particle diameter of 0.1 μm or more is 10% or less, and does not contain copper or contains 5 ppm or less of copper.

The invention belongs to the field of rare earth afterglow luminescent materials. The invention discloses a high-brightness divalent rare earth afterglow material. The molecular formula of the high-brightness divalent rare earth afterglow material is BaFCl: Gd / Li / Sm. The preparation method sequentially comprises the following steps: uniformly mixing and grinding barium fluoride, barium chloride, gadolinium chloride, samarium chloride and lithium chloride in proportion, carrying out high-temperature reaction in a tubular furnace, and carrying out heat preservation in a drying oven to obtain a product. The product has the characteristics that the product has very strong afterglow performance under X-ray excitation, the afterglow luminescence brightness value can reach 4.53 cd m <-2 >, the afterglow duration is longer than 100 hours, and the product has a very good application prospect in the field of delayed X-ray imaging.

A preparation method of a rare earth-containing heterojunction catalyst material CeO2 / Sm-MOF comprises the following steps: mixing and dissolving samarium nitrate hexahydrate and H4TBAPy in a composite solvent to form a mixed solution, carrying out a hydrothermal reaction to obtain Sm-MOF, mixing and dissolving ceric ammonium nitrate and Sm-MOF in an aqueous solution of gamma-valerolactone, then adding H2O2 and triethanolamine to form a mixed solution, carrying out magnetic stirring at 45-55 DEG C for 2-3 h, and carrying out hydrothermal reaction to obtain the rare earth-containing heterojunction catalyst material CeO2 / Sm-MOF. And then carrying out hydrothermal reaction and roasting treatment. The thermal stability of Sm-MOF is improved, ceric ammonium nitrate is adopted as a Ce source, a two-step heat treatment process is combined, the binding force and distribution uniformity of CeO2 on the surface of Sm-MOF are effectively improved, the catalytic activity and cycle stability of CeO2 / Sm-MOF are improved, and the Sm-MOF / CeO2 composite material has excellent degradation efficiency on MB, RhB, ATZ, CIP and the like and has excellent cycle stability in the cycle process.