41results about "Chromium compounds" patented technology

An object is to provide a copper-chromium oxide spinel having excellent dispersibility in a resin composition and excellent adhesion to plating, and a resin composition and a resin molded article containing the copper-chromium oxide spinel. Specifically, provided is a copper-chromium oxide spinel with a particle size distribution spread SPAN = (D90 - D10) / D50 of 2 or less where, in volume-converted particle size distribution obtained by a laser diffraction and scattering method, particle sizes with a cumulative frequency from a smaller particle size side of 10%, 50%, and 90% are D10, D50, and D90, respectively.

A method of fabricating plasmonic gold prism arrays for digital surface enhanced Raman spectroscopy, a plasmonic gold prism array arranged on a substrate for digital surface enhanced Raman spectroscopy, and a method of using a plasmonic gold prism array that is arranged on a substrate for digital surface enhanced Raman spectroscopy are disclosed. The method of fabricating plasmonic gold prism arrays for digital surface enhanced Raman spectroscopy includes depositing more than one layers of chromium and gold onto a plasmonic substrate comprising a monolayer of polystyrene beads and removing the monolayer of polystyrene beads under sonication in ethanol.

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula [M][Nb]y[O]z; wherein the active electrode material is oxygen deficient; wherein M consists of one of Mg, Cr, W, Mo, Cu, Ga, Ge, Ca, K, Ni, Co, Al, Sn, Mn, Ce, Sb, Y, La, Hf, Ta, Zn, In, or Cd; y satisfies 0.5≤y≤49; and z satisfies 4≤z≤124.

The application relates to the technical field of battery materials, and discloses a lithium secondary battery positive electrode coating material as well as a preparation method and application thereof. 3+z Nb 1‑ x M x O 4‑y R y wherein M is selected from one of Fe, Ti, Mn, Mo, W, V, Ta and Cr; R is selected from one of F, Cl, Br and I; 0<=x<1, 0<=y<=4, and the values of x, y and z satisfy the charge balance of the positive electrode coating material. The application integrates the triple functions of thermodynamic interface protection, fast ion conduction and charge compensation in a single material through cation, anion or anion-cation co-doping design based on Li3NbO4 as a matrix; the positive electrode coating material can significantly reduce the solid-solid interface impedance in a full solid-state battery, improve the first circle coulomb efficiency, and greatly improve the long cycle stability of an electrode; meanwhile, the positive electrode coating material can effectively inhibit the decomposition of high-voltage electrolyte in a traditional liquid battery, and improve the cycle life of a positive electrode material.

A cold storage material, which has a large specific heat and a small magnetization in an extremely low temperature region and has satisfactory manufacturability, is provided, and a method for manufacturing the same is provided. Further, a refrigerator having high efficiency and excellent cooling performance is provided by filling this refrigerator with the above-described cold storage material. Moreover, a device incorporating a superconducting coil capable of reducing influence of magnetic noise derived from a cold storage material is provided. The cold storage material of embodiments is a granular body composed of an intermetallic compound in which the ThCr2Si2-type structure (11) occupies 80% by volume or more, and has a crystallite size of 70 nm or less.

This provides a new material that exhibits negative thermal expansion. [Solution] The negative thermal expansion material is Ti (3) 2-x M x O3(M contains at least one element selected from Mg, Al, Si, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, La, Ta, W, Bi, 0

The invention provides a wide-band-gap ferromagnetic insulator material. The chemical formula of the wide-band-gap ferromagnetic insulator material is Cd2CrSbO6. The invention also provides a method for preparing the wide-band-gap ferromagnetic insulator material, which comprises the following steps: (1) sufficiently grinding and mixing CdO, Cr2O3 and Sb2O5 in a protective gas atmosphere to obtain a mixture; (2) sealing and wrapping the mixture, and then carrying out heating and pressurizing treatment; and (3) cooling and depressurizing the treated product obtained in the step (2). The ferromagnetic insulator material Cd2CrSbO6 disclosed by the invention has a potential application value in spintronics devices.

This invention discloses a copper-chromium catalyst, its preparation method, and its application. The preparation method of the catalyst includes: (1) mixing polylactic acid with dichloromethane and ethanol to obtain a polymer solution, adding a soluble copper salt to it, stirring, and obtaining a spinning solution; (2) using a coaxial electrospinning nozzle to perform electrospinning with the obtained spinning solution, and collecting the obtained solid; (3) placing the obtained solid in an ethanol solution of trimesic acid to react, washing and drying after the reaction, and collecting the obtained solid; (4) dissolving a soluble chromium salt in ethanol and reacting it with the obtained solid, then washing and drying, and collecting the obtained catalyst precursor; (5) calcining the obtained catalyst precursor to obtain an unformed catalyst, then pressing it into tablets to obtain the copper-chromium catalyst. This catalyst can improve the conversion rate and selectivity of the catalyst in the hydrogenation of dimethyl maleate to prepare 1,4-butanediol and co-production of γ-butyrolactone and tetrahydrofuran.

Doped titanium niobate is provided, which has a chemical structure of Ti(1-x)M1xNb(2-y)M2yO(7-z)Qz or Ti(2-x′)M1x′Nb(10-y′)M2y′O(29-z′)Qz′, wherein M1 is Li, Mg, or a combination thereof; M2 is Fe, Mn, V, Ni, Cr, or a combination thereof; Q is F, Cl, Br, I, S, or a combination thereof; 0≤x≤0.15; 0≤y≤0.15; 0.01≤z≤2; 0≤x′≤0.3; 0≤y′≤0.9; and 0.01≤z′≤8.

The invention relates to a niobium-based near-infrared fluorescent material, which belongs to the field of fluorescent materials and can be represented by a chemical formula (0 < x < = 0.1). The crystal structure of the niobium-based near-infrared fluorescent material is a monoclinic system, and the space group is P12 / m1. Under the excitation of blue light with the wavelength of 447 nm, the main peak of the emission spectrum of the niobium-based near-infrared fluorescent material is 850-860 nm, the full width at half maximum of the emission spectrum is 200-220 nm, and the internal quantum efficiency is 65%-90%, so that the niobium-based near-infrared fluorescent material can be applied to light supplement of night vision equipment.

The invention provides a preparation method of a heterogeneous transition metal chalcogenide material. The preparation method comprises a heating step, a plasma forming step and a deposition step. In the heating step, the chalcogenide solid is heated at a heating temperature to form a chalcogenide gas. In the plasma forming step, reaction gas is introduced to assist the chalcogenide gas in forming chalcogenide plasma. In the deposition step, a substrate is arranged adjacent to the chalcogenide plasma, the substrate comprises a base material and a plating layer, and the chalcogenide plasma and the plating layer are subjected to a deposition reaction at a reaction temperature and a reaction pressure to form the heterogeneous transition metal chalcogenide material with excellent optical characteristics and a surface-enhanced Raman scattering effect. Therefore, the heterogeneous transition metal chalcogenide material can be applied to a surface-enhanced Raman scattering sensor.

Provided are a negative electrode for a secondary battery, a slurry for a negative electrode, and a method for manufacturing a negative electrode, each of which has improved life characteristics. The negative electrode for a secondary battery contains at least a graphite-based material and a silicon-based material as negative electrode active materials, and a conductive material, the graphite-based material includes a granulated product of artificial graphite and natural graphite, at least a part of the natural graphite in the granulated product is partially flaked to form a flaked portion, and the flaked portion is in contact with the silicon-based material or other granulated product of artificial graphite and natural graphite, or is complexed with the silicon-based material.

The invention discloses a nano chromium oxyfluoride catalyst as well as a preparation method and application thereof, and the catalyst is prepared by taking a chromium source as a precursor, taking small molecular organic acid, a cationic surfactant and a nonionic surfactant as templates, adding a fluorine source and adopting a template agent guiding-solid phase thermal decomposition method. The preparation method comprises the following steps: grinding and mixing a chromium source precursor, a fluorine source and a template agent, reacting the mixture at 100-200 DEG C for 6-48 hours, centrifugally washing the reactant, drying, and sufficiently roasting the dried product in a muffle furnace to obtain the nano chromium oxyfluoride catalyst. The prepared nano chromium oxyfluoride catalyst has extremely high selectivity and stability when applied to a reaction for preparing fluorine-containing olefins (HFOs) through gas-phase HF removal of hydrofluoroalkanes (HFCs), the catalytic selectivity reaches up to 100% (the selectivity of a cis-product Z-HFO-1225ye reaches up to 98%), the catalytic conversion rate reaches 85% or above, and the nano chromium oxyfluoride catalyst has the advantages of being high in conversion rate, high in selectivity, good in stability and suitable for industrial production. The cost is low, and the operation is simple.

The invention discloses an XNbBr4O type compound as well as a design and performance prediction method and application thereof, and belongs to the technical field of transition metal doped niobium oxybromide. Wherein X in the XNbBr4O type compound is vanadium, chromium or cobalt, and the compound has magnetic sequence or ferroelectric distortion regulated and controlled by X element doping. The XNbBr4O type compound disclosed by the invention provides a theoretical basis for designing a novel multiferroic photoelectric device, provides an effective way for rapidly screening a high-performance photoelectric material, and has important scientific significance and application value for guiding subsequent experimental synthesis and device design.

This invention discloses a core-shell structured rare-earth oxide / gallium oxide composite particle for magnetoresistive thin film preparation and its preparation method. The composite particle comprises a core and a shell, wherein the core is composed of La. 1‑x Ca x The rare-earth oxide precursor powder of TmO3 has a gallium oxide shell. The preparation method includes: first, preparing a homogeneous suspension of the rare-earth oxide precursor powder and liquid gallium metal; then, spreading the precursor powder in the suspension, followed by stirring, multi-stage ultrasonic dispersion, and separation using an inert ceramic scraper to obtain core-shell structured precursor particles coated with liquid gallium metal; finally, sintering to transform the liquid gallium metal into a gallium oxide shell. When used as a thermal resistance evaporation source, the composite particles of this invention effectively solve the problems of compositional shift and evaporation source explosion and splashing caused by vapor pressure differences in multi-component materials. They offer advantages such as flexible component design, good thermal stability, and low preparation cost, making them suitable for preparing magnetoresistive effect composite thin films.

The invention relates to metal nanoparticles which comprise a metal and a capping agent coordinated to the metal, wherein the capping agent is a salt of a cationic compound capable of absorbing visible light. It also relates to semiconductor metal oxide nanoparticles which comprise the metal nanoparticles, to a functionalised material comprising the semiconductor metal oxide nanoparticles, and to a photocatalytic paint which comprises either the semiconductor metal oxide nanoparticles or the functionalised material. The invention also relates to processes for the preparation of all these materials, and to the use of the semiconductor metal oxide nanoparticles or the functionalised material comprising them as biocides; particularly for the treatment or prevention of a viral disease or a bacterial infection; for removing Volatile Organic Compounds (VOCs) from of air and water supplies, and as a photocatalyst for water splitting.

The invention belongs to the technical field of pigments, and particularly relates to an irreversible thermochromic pigment capable of memorizing temperature and a preparation method thereof.The irreversible thermochromic pigment capable of memorizing temperature can serve as a pigment to be coated on the surface of a normally-working machine or part, and once an instrument breaks down and is heated, the irreversible thermochromic pigment can memorize temperature. The position of a fault point and the comprehensive effect of the highest heating temperature can be memorized according to the color change of the surface material; the preparation method of the irreversible thermochromic pigment capable of memorizing the temperature comprises the following steps: step 1, preparing and storing a solution; step 2, stirring; step 3, adding a mineralizing agent; 4, cooling and transferring: after stirring for a certain time, spontaneously cooling the small beaker at room temperature, and transferring the reactant into a reaction kettle after the reactant is uniformly stirred; and 5, carrying out a drying reaction.

The invention provides a preparation method of a chromium-doped VO2 precursor, which comprises the following steps: removing silicon from a vanadium leaching solution to obtain a silicon-removed solution; adding a reducing agent into the silicon removal solution, adjusting the pH value of the solution, and reacting to obtain a tetravalent vanadium mixed solution containing trivalent chromium; adjusting the pH value of the tetravalent vanadium mixed solution containing trivalent chromium, and stirring to obtain a tetravalent vanadium mixed precipitate containing trivalent chromium; adding water into the tetravalent vanadium mixed precipitate containing trivalent chromium, pulping and filtering to obtain a tetravalent vanadium mixed filter cake containing trivalent chromium; and drying the tetravalent vanadium mixed filter cake containing trivalent chromium to obtain the chromium-doped VO2 precursor. By adopting the method disclosed by the invention, the chromium-doped VO2 precursor containing trivalent chromium and tetravalent vanadium can be obtained, and the technical problem that pentavalent vanadium sources such as V2O5, ammonium metavanadate and the like which are commonly used as synthesis raw materials of the lithium vanadium phosphate / sodium positive electrode material are relatively high in toxicity is solved.

The application relates to the field of organic metal synthesis, in particular to a preparation method of a metal carbonyl. The preparation method of the metal carbonyl comprises the following steps: mixing a chromium trichloride tetrahydrofuran complex and an ether solvent, then adding a Grignard reagent solution under a CO atmosphere, and performing reaction. The application improves the raw material form and the reaction sequence while keeping the basic reaction path of the Grignard reagent method for synthesizing chromium hexacarbonyl, provides a stable, controllable and industrial application prospect technical scheme for continuous preparation of chromium hexacarbonyl, and provides a new idea for preparation of the metal carbonyl.

A class of compositions that are inclusive of a lithium metal oxide or oxyfluoride compound having a general formula: LiTM[n]OF where TM[n] represents a number of transition metal species inclusive of transitional metal species differentiated by charge or d0 electron shell conformation, with [n] being at least 4 of said transitional metal species, and wherein said lithium metal oxide or oxyfluoride has a cation-disordered rocksalt (DRX) structure and a mitigated SRO via a high entropy DRX design strategy. Also featured is a method of synthesizing the high entropy DRX lithium metal oxide or oxyfluoride compounds, as well as usage of the same in Li-ion batteries, with particular utility in cathodes of such Li-ion batteries.

The present invention provides an electrochemical cell, e.g., a lithium ion battery, including an anode, a cathode, and an electrolyte disposed between the anode and the cathode, the anode including a niobium-containing oxide as an active anode material, the niobium-containing oxide having a crystal structure of M II 2Nb 34 O 87 , M III Nb 11 O 29 , M III Nb 49 O 124 , M IV Nb 24 O 62 , M V NbO 25 , M VI Nb 12 O 33 , H-Nb2O5, or N-Nb2O5 crystal structures, and the cells have an N / P ratio >1 as defined herein.

The present disclosure provides an alkali metal-containing oxide containing an alkali metal element and a metal element M other than the alkali metal element, the alkali metal-containing oxide being characterized in that: the ratio X / Y of the amount of substance X of the alkali metal element contained in the alkali metal-containing oxide to the amount of substance Y of the metal element M is 1.2-2.0; the metal element M includes two or more metal elements MS having valence numbers such that the absolute value of the difference between the average valence number of the same element and an integer closest to the average valence number is 0.1-0.5.

The invention belongs to the technical field of inorganic chemical industry, and particularly relates to a method for continuously preparing chromium hydroxide, which comprises the following steps: (1) heating a solution containing Cr < 6 + >, adding a reducing agent and a reducing auxiliary agent, maintaining the pH value of the system at 10-12, and carrying out a reduction reaction to obtain chromium hydroxide slurry; (2) standing and settling the obtained slurry, separating out two parts of chromium hydroxide slurry according to the volume ratio of (1.5-3): 1, and recycling the chromium hydroxide in the step (1) to control the growth of crystal nucleus; and (3) adding sulfuric acid and dilute sulfuric acid into the separated chromium hydroxide slurry step by step, adjusting the pH value of the system to 8-9, filtering, and washing until the pH value of washing water is 6.5-7.5 to obtain a target product. Through optimization of reaction conditions, introduction of the chromium hydroxide slurry and continuous process design, the problems of fine chromium hydroxide particles, high water content, low process efficiency and the like in the prior art are solved, and the method is suitable for the fields of chromium salt production, electroplating wastewater treatment, metal recovery and the like.

Methods of forming spinel ferrite nanoparticles containing a chromium-substituted copper ferrite as well as properties (e.g. particle size, crystallite size, pore size, surface area) of these spinel ferrite nanoparticles are described. Methods of preventing or reducing microbe growth on a surface by applying these spinel ferrite nanoparticles onto the surface in the form of a suspension or an antimicrobial product are also described.

The application discloses a chromium-site high-entropy lithium chromic titanate material and a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials.The crystal structure of the chromium-site high-entropy lithium chromic titanate material is a single spinel solid solution phase, and a chemical general formula thereof is Li(Cr 1‑x‑y‑z‑w V x Fe y Mn z Al w )TiO4.The preparation method is fast synthesis by one-step combustion method with chromium trioxide as an oxidizing agent and a carbohydrate as a reducing agent.The chromium-site high-entropy lithium chromic titanate material prepared by the application has high specific capacity and excellent cycle stability, and can be applied as a lithium ion battery negative electrode material.The application effectively solves the problems of limited theoretical capacity and poor rate performance of existing lithium chromic titanate materials, and provides a new way for developing high-performance lithium ion battery negative electrode materials.

This invention discloses a highly stable sulfide solid electrolyte and its preparation method, belonging to the field of solid electrolyte materials technology. The chemical formula of the electrolyte is Li. 11＋4z P 2－2z M 2z S 9－ 2x O 2x Cl 3－2y N 2y Where M is at least one of B, Al, Ga, In, Mn, and Cr, and N is at least one of F, Br, and I, with 2.25 ≤ x ≤ 4.5, 0.75 ≤ y ≤ 1.5, and 0.01 ≤ z ≤ 1. This invention reduces the PS4 content, which is easily attacked by polar groups, by doping the P-site with metal element M, the S-site with element O, and the Cl-site with halogen element N. 3‑ The proportion of sulfide solid electrolytes is adjusted, and lattice changes caused by dual doping are compensated by halogen atoms, thereby significantly improving the air and thermal stability of the sulfide solid electrolyte. The sulfide solid electrolyte provided by this invention exhibits excellent ionic conductivity and stability, making it suitable for the field of all-solid-state batteries.

The present invention relates to a method for producing doped aluminous materials, and in particular to a method for producing doped aluminum oxyhydroxide chloride and doped alpha-alumina.

A cold storage material, which has a large specific heat and a small magnetization in an extremely low temperature region and has satisfactory manufacturability, is provided, and a method for manufacturing the same is provided. Further, a refrigerator having high efficiency and excellent cooling performance is provided by filling this refrigerator with the above-described cold storage material. Moreover, a device incorporating a superconducting coil capable of reducing influence of magnetic noise derived from a cold storage material is provided. The cold storage material of embodiments is a granular body composed of an intermetallic compound in which the ThCr2Si2-type structure 11 occupies 80% by volume or more, and has a crystallite size of 70 nm or less.