249 results about "Niobium oxide" patented technology

The invention relates to a red fluorescent material excited by blue light, an LED device and fluorescent ceramic. The chemical formula of the red fluorescent material is La (2-x) MgNbO6.5: xEu < 3 + >, wherein x is more than or equal to 0.01 and less than or equal to 0.1. The preparation method comprises the following steps: weighing lanthanum oxide, magnesium oxide, niobium oxide and europium oxide raw materials according to a stoichiometric ratio, grinding and uniformly mixing; sintering the uniformly mixed powder in a muffle furnace at high temperature, and cooling to room temperature to obtain the red fluorescent material. Compared with the prior art, the novel oxide-based red fluorescent powder prepared by the invention can emit positive red light of which the central wavelength is 616nm under the excitation of 465nm blue light, and can be used for white light LED (Light Emitting Diode) luminescent devices and fluorescent ceramics.

The invention relates to a p-type niobium oxide dipole-based metal-oxide-semiconductor device and a manufacturing method thereof, and belongs to the technical field of semiconductor device manufacturing. According to the technical scheme, the MOS device is provided. A gate dielectric stack of the MOS device sequentially comprises an interface layer, a high-k dielectric layer and a p-type electric dipole layer containing niobium oxide from bottom to top. According to the preparation method, the dipole layer is deposited by adopting an atomic layer deposition process, and then atoms in the dipole layer are driven to be diffused to the interface of the high-k dielectric layer and the interface layer through high-temperature rapid annealing treatment so as to form effective electric dipoles. Compared with the prior art, the high dielectric constant characteristic is utilized, the threshold voltage can be positively regulated and controlled to a larger extent, meanwhile, the increase of EOT is remarkably inhibited, and good interface quality is kept.

The invention relates to a desolventizing layer modified silicon-carbon negative electrode and a preparation method, the desolventizing layer modified silicon-carbon negative electrode comprises a silicon-carbon negative electrode, the silicon-carbon negative electrode comprises porous carbon mainly comprising mesopores and a silicon substrate attached in the pores of the porous carbon, and the desolventizing layer is covered on the surface of the silicon-carbon negative electrode. The desolventizing layer is an oxide of an amorphous active metal and a composite oxide of the amorphous active metal and lithium, the desolventizing layer at least covers the surface of the silicon substrate in the pores of the porous carbon, the desolventizing layer is made of amorphous titanium oxide, lithium titanate, niobium oxide, lithium niobate and titanium niobate, and after the electrolyte permeates into the pores of the porous carbon, the surface of the silicon substrate is coated with the desolventizing layer. And the lithium ions subjected to desolvation through the desolvation layer are alloyed with a silicon substrate. And the structural stability, the charge-discharge efficiency and the rate capability of the silicon-carbon negative electrode material are improved.

The invention discloses a hydrogenation catalyst as well as a preparation method and application thereof. The hydrogenation catalyst comprises a molecular sieve coated with a metal oxide layer and active metal loaded on the metal oxide layer; the metal oxide layer is selected from at least one of titanium oxide, zinc oxide, zirconium oxide or niobium oxide, and the active metal is selected from at least one of Pt, Pd, Ru, Ir or Ni. The catalyst provided by the invention is used in cinnamyl aldehyde hydrogenation reaction, and has good cinnamyl aldehyde conversion rate and cinnamyl alcohol selectivity.

There is disclosed a highly efficient and economical catalyst for carbon monoxide (CO) oxidation at low temperatures, using a non-noble transition metal composition of copper oxide (CuO), cerium oxide (CeO2), and niobium oxide (Nb2O5). The catalyst, designated as 10CuCeNb, is synthesized via the wet impregnation method and is composed of with 10% CuO—CeO2 supported on Nb2O5. It shows a significantly improved performance with full CO conversion achieved at relatively low temperature of 150° C. It demonstrates high stability over a 12-hour reaction time. The activation energy (Ea) is 23.1 kJ mol−1, supporting low-temperature CO oxidation with minimal energy input. The catalyst's high activity and stability are attributed to the formation of oxygen vacancies and active Lewis acid sites generated from the synergistic interaction between CuO, CeO2, and Nb2O5. This catalyst offers a cost-effective alternative to noble metal catalysts for use in catalytic converters, effectively reducing CO emissions in industrial and environmental applications.

The invention provides a method for extracting tantalum and niobium from tungsten tailings, and belongs to the technical field of rare metal recovery, and the method comprises the following steps: adding a reducing agent, a fluxing agent, a covering agent and a slag former into the tungsten tailings, and heating and smelting under the protection of inert gas to obtain an alloy ingot; the alloy ingot is crushed and then leached through hydrochloric acid, and acid leaching residues containing tantalum, niobium and tungsten are obtained; the acid leaching residues are subjected to alkaline leaching, and alkaline leaching residues containing tantalum and niobium are obtained; the alkaline leaching residues are leached through hydrofluoric acid and sulfuric acid, and decomposition liquid is obtained; and extracting and separating the decomposition liquid to obtain tantalum hydroxide and niobium hydroxide, and respectively calcining the tantalum hydroxide and niobium hydroxide to obtain tantalum oxide and niobium oxide. The method is simple in technological process, convenient to operate, low in cost and suitable for industrial production, tantalum and niobium can be efficiently extracted from tungsten tailings, and good economic benefits and environmental benefits are achieved.

The invention provides a niobium-tungsten alloy and a preparation method thereof. The preparation method comprises the following steps: 1) performing vacuum reduction sintering on a powder blank comprising niobium powder, first tungsten powder, first molybdenum powder and yttrium powder to obtain a niobium-tungsten-molybdenum alloy strip; (2) carrying out aluminothermic reaction on powder comprising niobium oxide, aluminum powder, second tungsten powder and second molybdenum powder to obtain a niobium-tungsten-molybdenum-aluminum alloy block; (3) the niobium-tungsten-molybdenum-aluminum alloy block is subjected to vacuum electron beam melting, and a niobium-tungsten-molybdenum alloy plate is obtained; 4) forming a smelting electrode by using the zirconium sheet niobium-tungsten-molybdenum alloy strip, the niobium-tungsten-molybdenum alloy plate and the niobium wire; and (5) the smelting electrode is subjected to vacuum electron beam smelting, and the niobium-tungsten alloy is obtained and comprises, by mass, 4.5%-5.5% of tungsten, 1.5%-2.5% of molybdenum, 1.4%-2.2% of zirconium, smaller than or equal to 0.08% of yttrium, 0.002%-0.02% of carbon, smaller than or equal to 0.2% of tantalum, smaller than or equal to 0.023% of oxygen, smaller than or equal to 0.015% of nitrogen, smaller than or equal to 0.002% of hydrogen and the balance niobium and inevitable impurities, and the inevitable impurities must contain yttrium.

Provided is a piezoelectric stack including: a substrate having a main surface with a diameter of 3 inches or more; and a piezoelectric film on the substrate, comprising an alkali niobium oxide containing K, Na, Nb, and O, wherein in the piezoelectric film, a composition of K, Na, and Nb satisfies a relationship of 0.94≤(K+Na) / Nb≤1.03 over an entire inner region of the main surface of the piezoelectric film, excluding its periphery.

The invention discloses a sulfur-loaded lamellar niobium oxide / niobium nitride-biomass derived porous carbon composite electrode material as well as a preparation method and application thereof, and belongs to the technical field of preparation methods of lithium-sulfur battery electrode materials, the method comprises the following steps: dispersing biomass derived porous carbon in an ethylene glycol solution dissolved with niobium pentachloride, and sequentially performing hydrothermal reaction to obtain the sulfur-loaded lamellar niobium oxide / niobium nitride-biomass derived porous carbon composite electrode material. The preparation method comprises the following steps: firstly, preparing a porous carbon composite material, calcining the porous carbon composite material, performing calcination reaction on the porous carbon composite material and melamine at the same time, finally mixing the porous carbon composite material with elemental sulfur, and performing heat treatment to obtain the sulfur-loaded lamellar niobium oxide / niobium nitride-biomass derived porous carbon composite electrode material. Lamellar niobium oxide / niobium nitride is utilized to increase polysulfide adsorption and catalytic conversion sites, a built-in electric field generated by constructing a niobium-based heterojunction is utilized to promote the electron transfer rate in the polysulfide conversion process, the electrode reaction kinetics is accelerated, and biomass derived porous carbon is utilized to improve the matrix conductivity and inhibit the shuttle effect of polysulfide, so that the conversion efficiency of the polysulfide is improved. The cycle performance and the service life of the lithium-sulfur battery are synergistically improved.

The invention discloses a hafnium oxide-based RRAM with a niobium oxide thermal enhancement layer and application, and belongs to the field of semiconductor memory devices. The hafnium oxide-based RRAM with the niobium oxide thermal enhancement layer sequentially comprises a top electrode, a niobium oxide layer, an HfO2 layer, an HfOx layer and a bottom electrode from top to bottom, and the niobium oxide thermal enhancement layer is inserted into the hafnium oxide-based RRAM, so that the forming voltage and the working temperature can be reduced, a storage window is also enlarged, and in the forming process, the storage temperature of the storage window can be increased. The growth direction of the conductive filament is effectively controlled; and the breaking point of the conductive filament can be effectively regulated and controlled in the reset process.

The invention relates to the technical field of lithium ion batteries, in particular to a nickel cobalt lithium manganate positive electrode material and a preparation method thereof. According to the invention, the technical problems of poor cycle performance and low specific capacity of the existing nickel cobalt lithium manganate positive electrode material are solved. The preparation method comprises the following steps: synthesizing precursor powder by adopting a coprecipitation process; then carrying out high-shear mixing on the precursor, lithium hydroxide, nano niobium oxide and magnesium fluoride; after the mixed material is subjected to pre-oxidation and high-temperature oxygen-enriched gradient sintering, a gradient reduction etching process is adopted in the cooling stage, and strong wind quenching is matched for surface shaping; and finally, carrying out air jet pulverization and demagnetization to obtain the nickel cobalt lithium manganate positive electrode material. According to the method, lattice respiration stress is effectively dissipated by constructing a radial ordered structure, a bulk phase structure is stabilized through multi-element synergistic doping, interfacial ion transport kinetics is optimized through reduction-induced surface oxygen vacancies and a lattice distortion layer, and the synergistic strategy ensures high stability of the material structure and meanwhile, the material structure has a good application prospect. And the de-intercalation efficiency of the active lithium is greatly improved.

Provided are an oxide sintered body mainly containing a molybdenum oxide, a sputtering target containing the sintered body, and an oxide thin film formed by the sintered body. In the present invention, by adding a specific (pseudo) metal oxide in a prescribed range to a molybdenum oxide and a niobium oxide which are difficult to sinter, the sinterability can be improved and high-density characteristics can be ensured even if pressureless sintering is performed.

The invention relates to the technical field of purification and impurity removal, and discloses a method for preparing low-antimony niobium oxide by removing antimony from a fluoroniobic acid solution, which comprises the following steps: adding peroxide into the fluoroniobic acid solution for complexing, then adding ammonia to adjust the precipitation pH value of the solution to obtain niobium salt precipitation, carrying out solid-liquid separation, and roasting to obtain the low-antimony niobium oxide. According to the method, the deep removal of antimony in the fluorine niobic acid solution can be realized, and the obtained niobium-containing peroxide complex can meet the requirements of preparing a 4N-grade high-purity niobium oxide product; the method does not need to consume expensive special reagents, only needs to consume part of peroxy ions, is low in cost and small in pollution, and is beneficial to product quality; the whole process is simple to operate, does not need other matched impurity removal equipment, is low in investment and short in flow, and is easy to realize continuous production.

The present invention relates to a method for smelting ferroniobium and enriching rare earths and titanium, comprising: S1, providing a co-existing ore or metallurgical slag containing niobium, titanium, rare earths, and iron; S2, adding a modifier and a siliceous reducing agent, and after high-temperature smelting and reduction, obtaining a layered ferroniobium alloy melt and a slag containing rare earths and titanium; S3, controlling the temperature and cooling the slag containing rare earths and titanium to room temperature, so that the rare earths and titanium in the slag are directionally precipitated and grown in a perovskite phase; S4, crushing and grinding the cooled slag, and obtaining a rare earth-rich perovskite concentrate by flotation. The present invention utilizes a siliceous reducing agent to selectively reduce multiple metal elements in the co-existing ore or metallurgical slag containing rare earths, niobium, titanium, and iron. The method selectively reduces iron oxides and niobium oxides in the material in a high-temperature molten state, avoiding the reduction of titanium oxides and rare earth oxides. The method successfully smelts a ferroniobium alloy melt, obtaining a high-grade ferroniobium alloy melt and a high-grade rare earth-rich perovskite concentrate.

Disclosed herein are porous electrochromic niobium oxide films comprising a plurality of niobium oxide nanocrystals, wherein the plurality of niobium oxide nanocrystals comprise niobium oxide having a formula of NbOx where x represents the average Nb:O ratio in the niobium oxide and where x is from 2 to 2.6. Also disclosed herein are methods of making the porous electrochromic niobium oxide films, methods of use of the porous electrochromic niobium oxide films, and devices comprising the porous electrochromic niobium oxide films.

An anti-reflection film (1) is provided with a transparent base film (2), an anti-reflection layer (3), and an antifouling layer (4) in this order toward one side in the thickness direction. The transparent substrate film (2) is provided with a transparent resin film (21). The anti-reflection layer (3) is an alternating laminate comprising at least one niobium oxide layer (31) and at least one silicon oxide layer (32), and the layer of the anti-reflection layer (3) closest to the antifouling layer (4) is the silicon oxide layer (32). Furthermore, in a difference spectrum calculated from Fourier transform infrared spectrophotometer analysis (FT-IR analysis), when the maximum absorption peak intensity originating from Si-O-Si symmetric scaling near 1050 cm <-1 > is standardized to 1 and the absorption peak intensity originating from Si-O-Si asymmetric scaling at 1200 cm <-1 > is defined as X, 1 / X is 5.0 or more.

The embodiment of the invention discloses a donor-receptor complementary co-doped hafnium oxide-based ferroelectric film material and a preparation method thereof. The method comprises the following steps: according to the composition of the donor-receptor complementary co-doped hafnium oxide-based ceramic target material, mixing raw material powder to obtain mixed raw material powder; calcining the mixed raw material powder under a preset condition; pressing and molding the calcined product into a target material green body; and sintering the target material green body to obtain the donor-receptor complementary co-doped hafnium oxide-based ceramic target material. Wherein the composition of the donor-acceptor complementary co-doped hafnium oxide-based ceramic target material is expressed as AxByHf (1-x-y) O2, A is a donor and comprises elements niobium and tan, and B is an acceptor and comprises elements yttrium and lanthanum; x is more than 0.01 and less than 0.05, and y is more than 0.01 and less than 0.05; the raw material powder containing the donor comprises niobium oxide and tantalum oxide, and the raw material powder containing the acceptor comprises yttrium oxide and lanthanum oxide; and taking the donor-acceptor complementary co-doped hafnium oxide-based ceramic target material as a sputtering target, and obtaining the donor-acceptor complementary co-doped hafnium oxide-based ferroelectric material film by using a pulse laser deposition method.

The invention discloses a preparation method of high-purity Nb2O5, belongs to the field of preparation of Nb2O5, and solves the problem of low purity of Nb2O5 prepared by the existing method. The preparation method comprises the steps that a metal niobium ingot with the purity larger than or equal to 99.999% is adopted, and vacuum drying is conducted after surface peeling, dilute nitric acid ultrasonic cleaning and high-purity water flushing are conducted; the pretreated niobium ingot is subjected to a hydrogenation reaction in a pure hydrogen atmosphere, niobium hydride is generated and then crushed, and niobium hydride powder is obtained; carrying out dehydrogenation treatment on the niobium hydride powder under a high vacuum condition; dissolving the metal niobium powder with electronic-grade hydrofluoric acid, and filtering to obtain fluorine niobic acid filtrate; performing multi-stage counter-current extraction and reverse extraction on the fluobiobic acid filtrate by adopting an extracting agent to obtain fluobiobic acid reverse extraction liquid; introducing high-purity ammonia gas into the fluobiobic acid strip liquor, and precipitating to generate niobium hydroxide; ageing, filtering and washing with high-purity water for multiple times to obtain a niobium hydroxide filter cake; and calcining the niobium hydroxide filter cake in a high-purity oxygen atmosphere in stages to obtain niobium pentoxide. The niobium pentoxide prepared by the method disclosed by the invention is high in purity.

The invention provides a preparation method of ultra-pure niobium pentoxide, which is stable in process and high in efficiency, and aims to reduce the silicon content to be less than 3ppm and obtain ultra-pure niobium pentoxide through the synergistic effect of directional dissolution silicon removal and precision filtration and washing impurity removal.

The utility model discloses an infrared barrier film for a car window. The infrared barrier film sequentially comprises a base material layer, a niobium oxide layer, a first Ag layer, a zinc aluminum oxide layer, a second Ag layer, a NiCr layer and a silicon oxide layer from bottom to top. The niobium oxide layer is arranged on one surface of the base material layer in a magnetron sputtering manner; the first Ag layer is arranged on the surface of the niobium oxide layer through magnetron sputtering; the aluminum zinc oxide layer is arranged on the surface of the first Ag layer through magnetron sputtering; the second Ag layer is arranged on the surface of the aluminum zinc oxide layer through magnetron sputtering; the NiCr layer is arranged on the surface of the second Ag layer through magnetron sputtering; the silicon oxide layer is arranged on the surface of the NiCr layer in a magnetron sputtering mode. According to the infrared barrier film for the vehicle window, by arranging the first Ag layer, the aluminum zinc oxide layer and the second Ag layer, the reflectivity of infrared rays can be improved, the transmittance of the infrared rays can be reduced, the infrared rays entering a vehicle are reduced, and the higher heat insulation rate is achieved. In addition, the infrared barrier film has lower visible light transmittance, and the privacy of the infrared barrier film can be improved while the reflectivity is improved.

The invention discloses an oxygen sensor and a preparation method of an oxygen sensor substrate. The oxygen sensor comprises a substrate, the substrate is provided with a zirconium oxide layer, and the zirconium oxide layer comprises Zr, trivalent elements, Nb and Al in terms of elements; the phase of the zirconium oxide layer comprises 96wt%-99.7 wt% of tetragonal phase zirconium oxide, the remaining phase is monoclinic phase zirconium oxide, in the tetragonal phase zirconium oxide, the ratio of the molar content of trivalent element oxide to the total molar content of zirconium oxide, trivalent element oxide and niobium oxide is a, a is equal to 4.5 mol%-5.5 mol%, b is equal to 4.5 mol%-5.5 mol%, and c is equal to 4.5 mol%-5.5 mol%. The ratio of the molar content of niobium oxide to the total molar content of zirconium oxide, trivalent element oxide and niobium oxide is b, and a-b is equal to 4mol%-5mol%; wherein the trivalent elements comprise one or more of Y, Sm, Er, Sc and Nd, and the substrate of the oxygen sensor provided by the invention has relatively good mechanical properties.

A thermal resistance sensor comprising a substrate, a structure bonded to the substrate, and a niobium oxide layer bonded to the structure.

The invention discloses high-purity superfine high-entropy nitride (Hf, Zr, Ta, Nb and Ti) N powder as well as a low-temperature synthesis method and application of the high-purity superfine high-entropy nitride (Hf, Zr, Ta, Nb and Ti) N powder. The method comprises the following steps: by taking mixed powder of hafnium oxide, zirconium oxide, tantalum oxide, niobium oxide and titanium oxide as a raw material, adding magnesium as a catalyst, adding sodium chloride and potassium chloride as ion diffusants and adding carbon powder as an oxygen trapping agent, mixing, heating to 900-1100 DEG C in a nitrogen atmosphere at a gas flow rate of 100-300ml / min, carrying out heat treatment for 4-8 hours, and cooling along with a furnace temperature, thereby obtaining the hafnium oxide / zirconium oxide / tantalum oxide composite material. The powder obtained after heat treatment is soaked in a hydrochloric acid solution with the concentration being 0.5 mol / L for 0.5-2 h in the stirring state, then filtering and drying are conducted for 12 h, and the high-entropy nitride powder is prepared and has the molecular formula of (Hf < 0.2 > Zr < 0.2 > Ta < 0.2 > Nb < 0.2 > Ti < 0.2 >) Nx. The synthesis method is simple in process, the prepared high-entropy nitride powder has a single high-entropy nitride (Hf0. 2Zr0. 2Ta0. 2Nb0. 2Ti0. 2) Nx phase and has the characteristics of small particle size, low oxygen content and high purity, the particle size of the powder is 0.09-0.14 mu m, and the oxygen content is 0.07-0.18 wt%.

Various embodiments herein relate to electrochromic devices and electrochromic device precursors, as well as methods and apparatus for fabricating such electrochromic devices and electrochromic device precursors. In certain embodiments, the electrochromic device or precursor may include one or more particular materials such as a particular electrochromic material and / or a particular counter electrode material. In various implementations, the electrochromic material includes tungsten molybdenum oxide. In these or other implementation, the counter electrode material may include nickel tungsten oxide, nickel tungsten tantalum oxide, nickel tungsten niobium oxide, nickel tungsten tin oxide, or another material.

The invention relates to a composite pane (1), in particular for a projection assembly (100) in a vehicle, at least comprising an outer pane (2), a thermoplastic intermediate layer (4), an inner pane (3), and a reflective layer (9) which is suitable for reflecting light, in particular p-polarized light. The outer pane (2) has an exterior-side surface (I) and an interior-side surface (II), and the inner pane (3) has an exterior-side surface (III) and an interior-side surface (IV). The reflective layer (9) is provided on the interior-side surface (IV) of the inner pane (3), said reflective layer (9) being positioned in at least one composite pane (1) display region in which, in a viewing direction through the composite pane (1) starting from the interior-side surface (IV) of the inner pane (3), the reflective layer (9) is formed spatially in front of an opaque background. A transparent protective layer (7) is provided on the reflective layer (9) and additionally on at least some regions of the interior-side surface (IV) of the inner pane (3) not occupied by the reflective layer (9), preferably on the entire interior-side surface of the inner pane not occupied by the reflective layer, said protective layer being formed on the basis of silicon oxide (SiOx), silicon nitride, titanium oxide, zirconium oxide, hafnium oxide, niobium oxide, tantalum oxide, aluminum oxide, aluminum nitride or on the basis of silicon oxide or silicon nitride doped with Al, Ti, Zr, Hf, and / or B. The invention also relates to a method for producing such a composite pane (1) and to the use thereof.

The invention belongs to the technical field of plasma thermal spraying, and discloses a preparation method and application of niobium powder for plasma thermal spraying, and the preparation method of the niobium powder comprises the following steps: S1, primary sintering: uniformly mixing niobium oxide and niobium carbide, then carrying out compression molding, and carrying out primary vacuum reduction sintering to obtain hydrogenated primary niobium; the primary sintering is segmented sintering: in the first stage, the sintering temperature is 1100-1200 DEG C; in the second stage, the sintering temperature is 1500-1600 DEG C; in the third stage, the sintering temperature is 1900-2000 DEG C; s2, primary niobium powder is prepared; s3, secondary sintering: firstly, uniformly mixing the primary niobium powder with a forming agent, then carrying out compression molding, and carrying out secondary vacuum sintering at the sintering temperature of 1900-2100 DEG C to obtain hydrogenated secondary niobium; and then, the hydrogenated secondary niobium is sieved and dehydrogenated to obtain niobium powder. The niobium powder preparation method has the advantages of being simple in technological process, high in production efficiency, low in energy consumption, small in pollution and the like, and the prepared niobium powder is uniform in particle size and low in oxygen content and completely meets the use requirement of thermal spraying.

The invention provides a preparation method and application of a monatomic catalyst for preparing 1, 3-propylene glycol through high-selectivity hydrogenolysis of glycerol. The catalyst is composed of active metal, a metal oxide auxiliary agent A and a carrier. The active metal is Pt, and the metal oxide auxiliary agent A is one or two or more of niobium oxide, tantalum oxide, molybdenum oxide and tungsten oxide. The composition and proportion of the monatomic catalyst are accurately regulated and controlled through a strong electrostatic adsorption method, 1, 3-propylene glycol is prepared through efficient catalysis of selective hydrogenolysis of glycerin, the yield of 1, 3-propylene glycol in a high-concentration glycerin solution (50 wt%) reaches up to 0.43 g of 1, 3-propylene glycol g of the catalyst h <-1 >, and excellent stability is achieved. The method has the advantages that the catalyst is simple and convenient to prepare and low in cost, the precious metal atom utilization rate is 100%, recovery is easy, products are easy to separate, and the reaction process is environment-friendly. According to the technical scheme, the invention provides a novel preparation method and application of the monatomic catalyst for preparing 1, 3-propylene glycol through efficient hydrogenolysis of glycerol, and the monatomic catalyst has an excellent application prospect.

Provided are: a negative electrode for an all-solid-state secondary battery, which has a low resistance value; a method for producing the negative electrode; and an all-solid-state secondary battery. The present invention relates to targets 12, 3, 7, 11 of sustainable development targets. The negative electrode for an all-solid-state secondary battery is characterized by comprising a molded body of a negative electrode mixture containing a solid electrolyte and a negative electrode material containing a negative electrode active material, the negative electrode material containing, as the negative electrode active material, a carbon material having, on the surface thereof, a layer containing an oxide having lithium ion conductivity. The carbon material contains at least one of graphite and hard carbon, the oxide contains at least one of lithium niobium oxide, lithium titanium oxide and lithium phosphorus oxide, the amount of the oxide is 1 part by mass or more with respect to 100 parts by mass of the carbon material, and a sulfide-based solid electrolyte is contained as the solid electrolyte. The thickness of the molded body of the negative electrode mixture is 200 [mu] m or more and 3000 [mu] m or less.

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 present invention relates to a preactivation method of a supported metal catalyst for catalyzing the hydrogenolysis reaction of polyols. The catalyst is composed of a carrier and active components A and B, wherein the carrier is one of aluminum oxide, silicon oxide, zirconium oxide, titanium oxide or molecular sieve, the active component A is one of tungsten oxide, molybdenum oxide and niobium oxide, and the active component B is one of precious metals ruthenium, rhodium, palladium, iridium and platinum. The present invention adopts a technical solution that uses pure hydrogen or a mixed gas containing hydrogen and an inert gas, and liquid water as a reducing agent, and the preactivation temperature is 80 to 500° C., and the hydrogen dissolved in the liquid contacts the catalyst, and the high-valent metal oxide in the catalyst is slowly reduced to a low-valent active metal oxide or a metal element, thereby effectively solving the sintering problem of the catalyst in the hydrogen reduction process, thereby significantly improving the reaction activity of the hydrogenolysis of polyols and the selectivity of the target product.