84 results about "Samarium oxide" patented technology

The invention discloses a Sm-doped modified Ni / de-USY catalyst for ammonia hydrogen production. The Sm-doped modified Ni / de-USY catalyst is prepared from the following raw materials in percentage by mass: 97.82%-98.85% of a USY molecular sieve, 0.5%-1.4% of a nickel compound and 0.22%-0.79% of a samarium oxide. The invention also discloses a preparation method of the Sm-doped modified Ni / de-USY catalyst for hydrogen production from ammonia, which comprises the following steps: performing hydrothermal pretreatment on the USY molecular sieve, performing acid treatment, and preparing the catalyst for hydrogen production from ammonia by utilizing an ultrasonic-assisted equivalent-volume impregnation method. The catalyst for hydrogen production from ammonia can efficiently decompose ammonia gas and is high in hydrogen production efficiency, and due to the fact that active metal is highly dispersed on the de-USY surface, high relative crystallinity is kept, and the pore channel structure of the complete Y molecular sieve is kept, the catalyst for hydrogen production from ammonia has high stability, and the catalytic effect can be prevented from being affected.

The invention relates to the technical field of electronic glass fiber materials, and particularly discloses a corrosion-resistant low-dielectric glass fiber and a preparation process thereof. A preparation process of corrosion-resistant low-dielectric glass fibers comprises the following steps: S1, uniformly mixing glass fiber raw materials, melting, clarifying, homogenizing, cooling, and carrying out wiredrawing treatment to obtain glass fiber precursors; and S2, sequentially carrying out plasma treatment and impregnating compound treatment on the glass fiber precursor, drying and curing to obtain the corrosion-resistant low-dielectric glass fiber, silicon dioxide, aluminum oxide, magnesium oxide, boric oxide, calcium fluoride, tin oxide, sodium oxide, potassium oxide and rare earth oxide are used as glass fiber raw materials, and the rare earth oxide is a mixture of gadolinium oxide, cerium oxide and samarium oxide. The obtained glass fiber has excellent low dielectric property and corrosion resistance, and has a wide market prospect.

The invention discloses a thermal shock resistant and corrosion resistant honeycomb ceramic and a preparation method thereof. The honeycomb ceramic comprises basic powder and a composite additive, the composite additive comprises samarium oxide and zirconium oxide, wherein the addition amount of the samarium oxide is 1-9 wt% of that of the basic powder, and the addition amount of the zirconium oxide is 1-9 wt% of that of the basic powder. The acid and alkali corrosion resistance of the honeycomb ceramic is improved by adding samarium oxide, meanwhile, the thermal shock resistance of the ceramic is improved by adding zirconium oxide, deformation generated in the sintering process of the ceramic is buffered, and therefore the thermal shock resistant and corrosion resistant honeycomb ceramic is obtained, and the corrosion resistance of the ceramic is synchronously improved through the synergistic interaction effect.

The invention provides a process for preparing lanthanum oxide by recovering lanthanum samarium slag through a nitrogen vortex separation method, which comprises the following steps: S1, distilling the lanthanum samarium slag through lanthanum thermal reaction, and then cutting into blocks for crushing; s2, the diced lanthanum samarium slag is put into a vertical compound crusher to be crushed; s3, separating metal lanthanum and samarium particles from the crushed particles through a particle winnowing machine; s4, performing precise winnowing on the lanthanum oxide and samarium oxide mixed powder to separate samarium oxide; s5, mixing the samarium oxide enrichment with a new material, and performing lanthanum thermal reaction distillation again; s6, the crushed lanthanum samarium powder is filled with nitrogen in a spiral separation powder stacking machine, and lanthanum powder is separated through vortexes; s7, the remaining lanthanum samarium powder is subjected to high-flow-rate separation, and after lanthanum powder is separated out, the lanthanum powder is returned to samarium oxide reduction production; and S8, the content of samarium in the recovered lanthanum powder is lower than 1%, and the recovered lanthanum powder can be used for lanthanum oxide electrolytic reduction to produce metal lanthanum. The method solves the problems of treatment and recovery of the lanthanum samarium slag, and has remarkable advantages in the aspects of environmental protection, cost, efficiency, product quality and the like.

The invention relates to the technical field of glass, in particular to a preparation process of 3D curved glass. The process comprises the following steps: S1, mixing diboron trioxide, ammonium dihydrogen phosphate, lithium oxide, calcium carbonate, cerium oxide, samarium oxide and ytterbium oxide, grinding, sieving, uniformly mixing, and heating to obtain a liquid phase substance; s2, clarifying the liquid-phase substance, introducing the clarified liquid-phase substance into a mold cavity, and carrying out hot bending forming to obtain a crude blank; and S3, annealing the rough blank, and carrying out fine trimming to obtain the 3D curved glass. The curved glass provided by the invention is excellent in mechanical property, high in impact resistance, uniform in display and free of deformation and distortion.

The invention belongs to the technical field of batteries, and provides a modified high-nickel ternary positive electrode material and a preparation method and application thereof, the modified high-nickel ternary positive electrode material comprises an inner core and a coating layer coating the inner core; the inner core comprises a gradient-doped high-nickel ternary material, a doped element comprises a samarium element, and the doping concentration of the samarium element is gradually increased from the center of the inner core to the surface of the inner core; the coating layer comprises a carbon layer, and samarium oxide particles are dispersed in the carbon layer. By forming gradient doping of the metal element samarium and utilizing 4f orbital electrons of Sm < 3 + >, H2-H3 phase change of the high-nickel ternary material can be inhibited, the layered structure of the material can be stabilized, lattice defects can be introduced, Li < + > transmission can be promoted, and diffusion energy barriers can be reduced. Meanwhile, the carbon layer doped with the samarium oxide particles is adopted for coating, on one hand, electrolyte corrosion is effectively inhibited, and on the other hand, the samarium oxide particles can further stabilize lattice oxygen and enhance electron conduction.

The invention belongs to the technical field of high-entropy materials, and discloses high-entropy pyrochlore ceramic as well as a preparation method and application thereof. The chemical formula of the high-entropy pyrochlore ceramic is (La0. 2Nd0. 2Sm0. 2Gd0. 2Er0. 2) 2M2O7, M is Zr, Hf, Ti or Sn, lanthanum oxide, neodymium oxide, samarium oxide, gadolinium oxide, erbium oxide and zirconium oxide or hafnium oxide or titanium oxide or tin oxide are sintered at the temperature of 1400-1600 DEG C to synthesize high-entropy pyrochlore powder, the high-entropy pyrochlore powder is mixed with tin chloride, ball-milled and dried to obtain mixed powder, the mixed powder is mixed with a surfactant, the mixed powder is mixed at the temperature of 200-400 DEG C, ball-milled and dried, and the high-entropy pyrochlore ceramic is obtained. And carrying out cold sintering under the pressure of 200-500MPa, and then carrying out vacuum sintering at the temperature of 1300-1600 DEG C, thereby obtaining the The high-entropy pyrochlore ceramic disclosed by the invention is high in purity, high in density, excellent in mechanical property and leaching resistance, low in sintering temperature and short in heat preservation time, and has an application prospect in the field of nuclear waste curing.

A composite electromagnetic wave-absorbing material and preparation method therefor are provided. The composite electromagnetic wave-absorbing material includes following raw materials: magnetite powder, nickel powder, copper powder, samarium oxide, gadolinium oxide, cerium oxide, carbon black powder, graphite powder, epoxy resin, barium titanate powder, antioxidant, curing agent, diluent and leveling agent. Ferrite wave-absorbing materials are used as matrixes to be compounded with nickel powder, copper powder, graphite powder, carbon black and barium titanate, and doped with mixed rare earth oxides through combination of samarium oxide, gadolinium oxide and cerium oxide to thereby obtain the composite electromagnetic wave-absorbing material which combines magnetic loss characteristics of magnetite powder, ferromagnetic behavior of nickel powder and conductivity of copper powder, helping to achieve good electromagnetic wave-absorbing performance. By introducing graphite powder, carbon black powder and barium titanate powder as fillers and doping rare earth, wave-absorbing characteristics of the composite electromagnetic wave-absorbing material are improved.

The application discloses a preparation method of a samarium trioxide doped lead zirconate titanate lead niobate piezoelectric fiber sensor. The application first prepares samarium trioxide doped lead zirconate titanate lead niobate ceramic; the ceramic is ground into powder and added into a sodium alginate solution, sodium dodecyl sulfate and citric acid are sequentially added, excessive water is added into the solution to obtain a low-viscosity slurry; then ball milling is carried out to break the agglomerates and obtain a uniform suspension, finally the slurry is injected into a CaCl2 solution to obtain a fiber, and the fiber is dried at room temperature and then calcined for the third time. The application precisely controls the molar ratio of raw materials, the reaction temperature, the reaction time and the doping ratio, guarantees the high-quality preparation of PNN-PZT / x Sm2O3 ceramic and fiberized piezoelectric ceramic, and makes the prepared piezoelectric fiber sensor have excellent piezoelectric performance and can more sensitively detect external signals.

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 present invention discloses a capacitor film for wireless charging and a preparation method thereof, which belongs to the technical field of capacitors. The capacitor film comprises 85-95 parts of polypropylene and 5-15 parts of nanofillers by mass; the nanofiller is modified zinc oxide, and the preparation method thereof comprises mixing zinc oxide, a chelating agent, a surfactant and water, then adding a soluble samarium salt to stir the reaction, and collecting insoluble matter; and calcining the insoluble matter to obtain modified zinc oxide. The present invention adsorbs samarium ions on the surface of zinc oxide, and after calcination, a modified zinc oxide with a samarium oxide-coated structure can be formed. The modified zinc oxide can be well dispersed in a polypropylene melt system, so that the capacitor film has good stability; the modified zinc oxide can significantly improve the breakdown field strength and energy storage density of the polypropylene system. In addition, by adjusting the temperature during longitudinal stretching and the longitudinal stretching ratio, it is beneficial to improve the mechanical strength of the film and the service life of the film.

The invention discloses a series of high-stability negative temperature coefficient heat-sensitive materials based on seven-principal-element high-entropy rare earth stannate and application, and aims to solve the problem that existing stannate heat-sensitive materials with pyrochlore structures cannot meet long-term application in high-temperature environments. The series of heat-sensitive materials are prepared by mixing lanthanum trioxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide and tin dioxide with erbium oxide or ytterbium oxide respectively, and the preparation process comprises the steps of wet three-dimensional vibration ball milling, powder calcination, cold isostatic pressing, high-temperature sintering and the like. And finally obtaining the negative temperature coefficient heat-sensitive material with the pyrochlore structure. The electrical property parameters of the series of materials are as follows: B is equal to 13914-14067 + / -1.89% K, and rho 1500 DEG C is equal to 180.26-204.09 + / -1.38% omega.cm. The negative temperature coefficient heat-sensitive material has the negative temperature coefficient characteristic in the wide temperature range of 400-1500 DEG C and shows excellent high-temperature aging stability under the high-temperature condition of 1500 DEG C, and the resistance drift rate of the negative temperature coefficient heat-sensitive material is only 0.7% after an aging test for 500 hours.

An optical device includes, in sequence, a surface formed of a metal oxide, a samarium oxide-containing layer in contact with the surface formed of a metal oxide, and a magnesium fluoride-containing layer in contact with the samarium oxide-containing layer so as to suppress optical absorption resulting from high-rate sputter deposition of a magnesium fluoride-containing layer on a surface formed of a metal oxide.

The invention discloses nano samarium oxide dispersion strengthened NiCoCrAlY alloy powder and a preparation method thereof, and relates to the technical field of alloy powder preparation. The method specifically comprises the following steps that a NiCoCrAlY alloy bar is smelted, then heat preservation is conducted, and a liquid alloy melt is obtained; the liquid alloy melt is subjected to high-pressure inert gas atomization powder preparation, nano samarium oxide flow perpendicular to the liquid flow direction of the alloy melt is synchronously introduced in the powder preparation process, high-temperature alloy liquid drops formed during atomization are impacted and wrapped, and target powder is obtained; performing hot isostatic pressing on the target powder to obtain a target alloy bar; a target alloy bar is repeatedly subjected to multiple smelting, high-pressure inert gas atomization powder manufacturing and hot isostatic pressing treatment, an alloy bar is obtained, then the alloy bar is subjected to high-pressure inert gas atomization powder manufacturing, and the nanometer samarium oxide dispersion strengthening type NiCoCrAlY alloy powder is obtained. By adopting the preparation method disclosed by the invention, the nano samarium oxide dispersion strengthened NiCoCrAlY alloy powder with excellent morphology, nano samarium oxide dispersity and purity can be obtained.

The invention discloses a samarium-cobalt magnet and a preparation method thereof. The samarium-cobalt magnet takes low-melting-point alloy powder, samarium oxide powder and samarium-cobalt magnetic powder as raw materials; the component of the samarium cobalt magnetic powder is Sm (Co < 1-a-b-c > Fe Cu Zr < c >) < z >; the component of the low-melting-point alloy is RE1-xMx, RE is one or more of Pr, Nd and Sm, and M is one or more of Cu, Al and Ga. The preparation method comprises the following steps: smelting a samarium-cobalt alloy raw material and a low-melting-point alloy raw material, and sequentially performing coarse crushing, medium crushing and jet milling to obtain samarium-cobalt magnetic powder and low-melting-point alloy powder; mixing samarium oxide powder, low-melting-point alloy powder and samarium cobalt magnetic powder to obtain magnetic powder; sequentially performing magnetic field forming, cold isostatic pressing and low-temperature sintering to obtain a sintered blank; and the sintered blank is sequentially subjected to solution treatment and aging heat treatment. The bending strength and the fracture toughness of the samarium-cobalt magnet are greatly improved, and the samarium-cobalt magnet has high magnetic performance and good mechanical performance.

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

The application discloses an iron-based barium sodium niobate ceramic material with high energy storage performance and a preparation method thereof. 4‑2x Sm 2x Na2Fe x Nb 10‑x O 30 , wherein 1<=x<=1.25. Barium carbonate, samarium oxide, sodium carbonate, ferrous oxide and niobium pentoxide are used as raw materials, and a standard solid-phase method is adopted to sinter the iron-based barium sodium niobate ceramic material. In the product formula, iron is used to replace niobium in the barium sodium niobate, which is lead-free, environment-friendly, rich in iron reserves and low in price, and is beneficial to control the cost of raw materials. In addition, the iron replacement is beneficial to enhance the relaxor ferroelectric performance of the material, can obtain a more slender hysteresis loop, and improves the energy storage efficiency of the material. The prepared ceramic material has few pores and cracks, high density, and the microstructure is obviously improved, the grain size is more fine and uniform, the ferroelectric polarization intensity and the breakdown field strength are significantly improved, the problem that the barium sodium niobate material is difficult to sinter is solved, and the ferroelectric performance and the energy storage performance are significantly improved.

The invention belongs to the technical field of high-entropy materials, and discloses a Cr2O3 coated high-entropy pyrochlore composite ceramic as well as a preparation method and application thereof, the composite ceramic is xCr2O3. (1-x) (La0. 2Nd0. 2Sm0. 2Gd0. 2Sc0. 2) 2Zr2O7, x is 5-20wt.%, Sb0. 2Sb0. 2Gd0. 2Sc0. 2) 2Zr2O7, Sb0. 2Sb0. 2Gd0. The preparation method comprises the following steps: sintering lanthanum oxide, neodymium oxide, samarium oxide, gadolinium oxide and zirconium oxide at 1400-1700 DEG C to obtain high-entropy pyrochlore powder, adding the high-entropy pyrochlore powder into a CrCl3 solution after ball milling, stirring, drying to obtain CrCl3 coated high-entropy pyrochlore powder, pressing the CrCl3 coated high-entropy pyrochlore powder into blocks, carrying out cold sintering at 200-400 DEG C and 200-500 MPa, carrying out heat preservation at 800-900 DEG C, heating to 1500-1700 DEG C, and carrying out pressureless sintering. The composite ceramic is high in density, excellent in radiation resistance and leaching resistance and capable of being applied to the field of nuclear waste solidified bodies.

The invention discloses a samarium hydroxychloride nanosheet and a preparation method thereof, which belong to the technical field of preparation of rare earth element hydroxychloride nanomaterials. The samarium hydroxychloride material is composed of nanosheet-shaped samarium hydroxychloride, the thickness of the nanosheet is about 10-40nm, the side length is about 50-300nm, and the surface is smooth. The preparation method is as follows: pour samarium chloride hexahydrate and samarium oxide into a mortar, mix them thoroughly, grind them evenly, and then pour them into a reactor, set the temperature to 80-200℃, and set the time to 1-14h; after the reaction is completed, naturally cool to room temperature, grind the product again, and obtain white samarium hydroxychloride powder. The operation method of the invention is simple, easy to control, has good repeatability, high sample purity, and good crystallinity.

The invention discloses a wave-absorbing and wave-transmitting integrated soft magnetic material and a preparation method thereof. The preparation method comprises the following steps: S1, drying samarium oxide or nickel oxide, iron oxide, lithium carbonate, zinc oxide, manganese oxide, copper oxide or bismuth oxide, uniformly mixing, ball-milling, sieving, and carrying out magnetic field heat treatment to obtain a primary heat treatment product; and S2, performing heat treatment on the primary heat treatment product to obtain the wave-absorbing and wave-transmitting integrated soft magnetic material. The method is realized through an in-situ solid-phase sintering method in a magnetic field, and the material can absorb and transmit electromagnetic waves at the same time in combination with magnetic field heat treatment.

The present invention belongs to the technical field of preparation of electronic information functional materials, and discloses a rare earth oxide-based microwave dielectric ceramic with both chemical and temperature stability and a preparation method thereof. The chemical formula is (1-x)Sm2O3–xMgO; wherein, x is the mass fraction and 0.10 ≤ x ≤ 0.25; using samarium trioxide and magnesium oxide as raw materials, the samarium oxide-based microwave dielectric ceramic is obtained by the traditional solid-state sintering method, and no aging and decomposition phenomenon is seen when exposed to air, and the dielectric constant ε r is 20.0 to 16.2, the quality factor Q×f is 49,700 to 63,600 GHz, and the resonant frequency temperature coefficient τ f is +15.3 to -6.3 ppm / °C. By adding magnesium oxide, the present invention inhibits the aging and decomposition of the samarium oxide ceramic; by adjusting the addition amount of magnesium oxide, near-zero adjustment of the resonant frequency temperature coefficient τ f is achieved while ensuring a high quality factor Q×f value.

The application belongs to the technical field of high-entropy materials, and discloses a composite ceramic of Cr2O3-coated high-entropy pyrochlore and a preparation method and application thereof. 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Sc 0.2 )2Zr2O7, wherein x is 5-20 wt.%; the composite ceramic is prepared by the following steps: sintering lanthanum oxide, neodymium oxide, samarium oxide, gadolinium oxide and zirconium oxide at 1400-1700 DEG C to obtain high-entropy pyrochlore powder, stirring the high-entropy pyrochlore powder in a CrCl3 solution after ball milling, drying to obtain CrCl3-coated high-entropy pyrochlore powder, cold sintering the CrCl3-coated high-entropy pyrochlore powder at 200-400 DEG C and 200-500 MPa, then heat preservation at 800-900 DEG C, and then pressureless sintering at 1500-1700 DEG C. The composite ceramic has high density, excellent radiation resistance and leaching resistance, and can be applied in the field of nuclear waste solidification.

The invention provides a filter for a urinal and a manufacturing method thereof. The filter is prepared from the following materials in parts by weight: 15 to 23 parts of bisphenol A epoxy resin, 50 to 57 parts of waste ceramic powder, 20 to 25 parts of glass fiber, 1 to 3 parts of low shrinkage agent, 0.2 to 0.4 part of curing agent, 0.8 to 1.1 parts of initiator and 1 to 2.5 parts of inorganic composite bactericide. The low shrinkage agent is modified polyurethane or polyvinyl chloride; the inorganic composite bactericide is prepared from the following components in parts by weight: 31 to 35 parts of quartz, 14 to 18 parts of aluminum oxide, 17 to 22 parts of thorium dioxide, 7 to 12 parts of tourmaline, 5 to 8 parts of samarium oxide, 7 to 9 parts of thulium oxide and 8 to 12 parts of zinc oxide. The filter for the urinal is good in sterilization effect, resistant to falling and convenient to clean and replace.

The invention discloses a yttrium hydride-based high-temperature-resistant neutron moderation shielding material containing gadolinium oxide / samarium oxide / europium oxide and a preparation method and application thereof, and belongs to the technical field of nuclear radiation shielding. The problems that existing pure yttrium hydride is weak in neutron absorbing and shielding capacity, prone to cracking and pulverization and the like are solved. The density of the shielding material is 4.36-4.62 g / cm < 3 >, and the mass proportions of the substances in the total amount of YH3, Sm2O3, Eu2O3 and Gd2O3 are as follows: YH3 is more than or equal to 99% and less than 100%, Gd2O3 is more than or equal to 0% and less than or equal to 1%, Sm2O3 is more than or equal to 0% and less than or equal to 1%, Eu2O3 is more than or equal to 0% and less than or equal to 1%, Gd2O3 + Sm2O3 + Eu2O3 is more than 0% and less than or equal to 1%, and Gd2O3 + Sm2O3 + Eu2O3 is more than 0% and less than or equal to 1%. The material can effectively absorb full-spectrum neutrons, has high density, low crack rate and low defect rate, is resistant to high temperature and excellent in shielding performance, adopts hydrogenation, nano-ball milling and pressing sintering preparation processes, and is suitable for a micro nuclear power reactor at the temperature of 900 DEG C or below.

The application relates to the field of wear-resistant ceramic materials, in particular to a preparation method of a high-wear-resistant ceramic material for a gas valve plate, wherein ceramic powder is ball milled to obtain slurry, a binder composed of carboxymethyl cellulose and fatty acid modified nanocellulose and a sulfuric acid ester surfactant are added into the slurry, the ball milling is continuously carried out, spray granulation is carried out to obtain composite powder, the composite powder is pressed into a blank, and finally, the blank is sintered in an inert gas atmosphere, the ceramic material prepared by the method has excellent mechanical properties, and has good compression resistance, heat resistance, corrosion resistance and wear resistance; through comparison, it is found that the addition of zirconium oxide, samarium oxide, ytterbium oxide, carboxymethyl cellulose, fatty acid modified nanocellulose and sodium dodecyl sulfate has a positive effect on improving the various properties of the ceramic material.

The invention discloses a high-temperature SOFC electric pile double-layer electrolyte-cathode coating assembly and a preparation method thereof, and relates to the technical field of solid oxide fuel cells. The invention discloses a double-layer electrolyte-cathode coating assembly of a high-temperature SOFC (Solid Oxide Fuel Cell) electric pile. The double-layer electrolyte-cathode coating assembly comprises a double-layer electrolyte substrate and a cathode coating loaded on the double-layer electrolyte substrate, the cathode coating comprises the following components: cobalt-doped lanthanum gadolinate and nano-scale samarium oxide-doped cerium oxide; the double-layer electrolyte substrate comprises a scandium oxide stabilized zirconia bottom layer and a nanoscale samarium oxide doped cerium oxide top layer. The LGC and the SDC are compounded to serve as the cathode coating, the interface reaction caused by Sr is avoided, meanwhile, the medium-temperature performance is optimized through the high conductivity of the ScSZ in the double-layer electrolyte and the interface buffering effect of the SDC, and the thermal expansion coefficients of the cathode coating and the double-layer electrolyte are highly matched.

This invention discloses a high-entropy / medium-entropy alloy oxide catalyst, its preparation method, and its application in ammonia synthesis. The high-entropy / medium-entropy alloy oxide catalyst comprises ruthenium (Ru) and / or cobalt (Co) as active components, a composite rare earth oxide of lanthanum oxide, cerium oxide, and samarium oxide as additives, and graphite carbon (GC) as a carrier. The active components and additives are all supported on the carrier. The catalyst achieves a higher ammonia synthesis rate than conventional Ru-based catalysts, and its lower Ru active metal content reduces catalyst preparation costs, thus offering potential industrial applications.

The invention provides a lithium manganese iron phosphate positive electrode material, a preparation method thereof and an electrochemical device. The preparation method comprises the following steps: mixing a manganese source, an iron source, a phosphorus source, a lithium source and a first carbon source, and grinding to obtain primary slurry; performing spray drying on the primary slurry to obtain first solid powder, and performing primary sintering on the first solid powder to obtain a base material; mixing the base material, a second carbon source and a samarium source, and grinding to obtain secondary slurry; and carrying out spray drying on the secondary slurry to obtain second solid powder, and carrying out primary sintering on the second solid powder to form a coating layer on the surface of the matrix material, the coating layer comprising a carbon coating layer located on the surface of the matrix material and a samarium oxide coating layer located on one side, far away from the matrix material, of the carbon coating layer, so as to obtain the lithium manganese iron phosphate positive electrode material. The preparation method can effectively relieve voltage platform attenuation of the lithium iron manganese phosphate positive electrode material at high temperature, and effectively improves the structural stability and electrochemical stability of the lithium iron manganese phosphate positive electrode material.

The invention provides a supported catalyst for sodium hypochlorite catalytic oxidation and a preparation method thereof, and relates to the field of catalytic materials and sewage treatment, the catalyst takes gamma-Al2O3 microspheres as a carrier, oxides of Co and Cu as main catalytic active components, and Sm oxide as a cocatalyst, and the catalyst is prepared by a hydrothermal method. The main active component and the cocatalyst are loaded by dipping and calcining methods. The prepared catalyst can efficiently catalyze and degrade organic pollutants in water, compared with the prior art, the catalyst system adopts the ternary metal oxide, the catalytic performance of active components can be improved through the synergistic effect of cobalt oxide and copper oxide, the stability of the catalyst is also improved, and the catalytic performance of the catalyst is improved. And samarium oxide as a cocatalyst can improve the dispersibility of the active component, increase the specific surface area, promote the decomposition of sodium hypochlorite to generate active oxygen atoms, and improve the catalytic activity and the removal efficiency of refractory organic matters.

The invention belongs to the technical field of preparation of ceramic frits, and particularly relates to a high-whiteness ceramic frit and a preparation method thereof. The high-whiteness ceramic frit is prepared from the following raw materials: quartz, calcined aluminum oxide, lithium china clay ore, magnesium slag, cordierite powder, lanthanum silicate, strontium tetraborate, sodium fluosilicate, nano sodium zirconium phosphate, nano yttrium aluminate and nano samarium oxide. In the high-whiteness ceramic frit provided by the invention, quartz and calcined alumina form a continuous aluminosilicate glass phase three-dimensional network structure; the lithium china clay ore, the magnesium slag, the strontium tetraborate and the sodium fluosilicate have a synergistic effect and are filled in pores of a three-dimensional network structure to promote densification of ceramic frits, so that whiteness scattering and mechanical property degradation caused by the pores are avoided; the mechanical property of the ceramic frit is ensured by introducing cordierite powder and lanthanum silicate; nano sodium zirconium phosphate, nano yttrium aluminate and nano samarium oxide are added as functional fillers, so that the whiteness of the ceramic frit is further improved.