44 results about "Barium stannate" patented technology

A nitrogen oxide storage material is disclosed which contains at least one storage component for nitrogen oxides in the form of an oxide, mixed oxide, carbonate or hydroxide of the alkaline earth metals magnesium, calcium, strontium and barium and the alkali metals potassium and caesium on a high surface area support material. The support material can be doped cerium oxide, cerium / zirconium mixed oxide, calcium titanate, strontium titanate, barium titanate, barium stannate, barium zirconate, magnesium oxide, lanthanum oxide, praseodymium oxide, samarium oxide, neodymium oxide, yttrium oxide, zirconium silicate, yttrium barium cuprate, lead titanate, tin titanate, bismuth titanate, lanthanum cobaltate, lanthanum manganate and barium cuprate or mixtures thereof.

The invention belongs to the field of a lead-free piezoelectric material and discloses BCT-BZT-BST (barium calcium titanate-barium zirconate titanate-barium stannate titanate) ternary system lead-free piezoelectric ceramic. The BCT-BZT-BST ternary system lead-free piezoelectric ceramic is characterized by having the following material components: Ba0.8-xCaxTi0.8O3-0.1BaTi0.9Sn0.1O3-0.1BaTi0.8Zr0.2O3, wherein x is in the range of 0.005 to 0.06. The BCT-BZT-BST ternary system lead-free piezoelectric ceramic is prepared from industrial raw materials by adopting a conventional piezoelectric ceramic preparation technology. The system is a perovskite phase. When x is in the range of 0.005 to 0.04, the BCT-BZT-BST ternary system lead-free piezoelectric ceramic is in morphotropic phase boundary region, has excellent piezoelectric property, has a piezoelectric constant d33 value of 420pC / N and an electro-mechanical coupling coefficient of 44 percent, and has a stable preparation process and wide application prospect.

The invention discloses a mesoporous perovskite solar cell and a preparation method thereof. The mesoporous perovskite solar cell comprises a transparent conductive base, a compact layer, a skeleton layer, a perovskite layer, a hole transmission layer and a counter electrode, wherein the compact layer, the skeleton layer, the perovskite layer, the hole transmission layer and the counter electrode are sequentially stacked on the transparent conductive base; and the skeleton layer is a barium stannate film with a perovskite structure and the like, and has p-type conductivity or n-type conductivity or comprises an insulator. With a novel perovskite oxide as the skeleton layer, the mesoporous perovskite solar cell has relatively high charge collection efficiency, and is relatively good in contact with a perovskite layer interface. Compared with a traditional titanium dioxide compact layer, the photoelectric properties such as short-circuit current and filling factors can be effectively improved; leakage current caused by contact of the hollow transmission layer and an electron transmission layer is reduced; reverse recombination of photoelectrons is prevented; and the photoelectric conversion efficiency is improved.

The present invention discloses a high-specific-surface-area nano barium stannate preparation method, SnCl4.5H2O as a source of tin is dissolved in a 10% to 70% hydrogen peroxide solution, aqueous ammonia is used for adjusting pH to 7 to 12, barium carbonate is added as a barium source, and reaction is performed at 20-100 DEG C for 0.5-24h; and high purity barium stannate nanoparticles can be obtained by filtering, washing and drying, and then calcining the resulting powder at 500 DEG C. The raw materials are readily available and inexpensive, the operation method is simple, repeatability is good, the preparation method is low in reaction condition requirements, large-scale industrial production is easy, the obtained product is high in purity, good in crystallinity, small in particle size and narrow in distribution, the specific surface area is up to 80m<2> / g or more, and the high-specific-surface-area nano barium stannate fills gaps in the market, and has good market prospects.

The invention discloses a novel barium-stannate-based conductive ceramic material and a method for preparing the same. The method comprises the following steps: adding antimony oxides into BaSnO3 which is easy to be semiconductive to realize donor doping, and adopting the prior ceramic preparation process to form conductive ceramics the compositions of which can be expressed by a general formula BaSbxSn1-xO3, wherein x is more than 0 and less than or equal to 2. The novel barium-stannate-based conductive ceramic material has the advantages of low cost, good electrical conductivity, stable chemical property, stable resistivity, and high temperature resistance. The room temperature resistivity of the novel barium-stannate-based conductive ceramic material is less than 1.0 omega.cm. Besides, the novel barium-stannate-based conductive ceramic material has simple and stable preparation process and strong practicality.

The invention discloses a low-loss titanium barium stannate dielectric material. A chemical formula of the low-loss titanium barium stannate dielectric material is Ba(SnxTi1-x)O3 (x is greater than or equal to 0.01 and less than or equal to 0.3): mixing BaCO3, TiO2 and SnO2 according to an stoichiometric equation, ball milling, drying, sieving, pre-burning at 1050 to 1200 DEG C, adding 0.5 percent by weight of PVA, mixing, ball milling, drying, sieving, and pressing and molding into a green body; burning the green body at 1275 to 1400 DEG C, and obtaining the low-loss titanium barium stannate dielectric material. A dielectric constant sigma r of the low-loss titanium barium stannate dielectric material is 5000 to 11560, and the dielectric loss is 0.003 to 0.008.

The invention discloses a BaSnO3 based multiphase electrolyte material and a preparation method thereof, belonging to the technical field of ceramic material. The preparation method comprises the following steps: carrying out Zn-Y codoping to obtain BaSn0.5Y0.46Zn0.04O2.73 which is easy to sinter and high in electric conductivity and chemical stability and is used as a substrate; and coating the surface of BaSn0.5Y0.46Zn0.04O2.73 uniformly with a second phase Ce0.8Sm0.2O2.9 through combination of a sol-gel method and ball milling, thus obtaining a nano multiphase material with a core-shell structure. According to the invention, based on the proton and oxygen iron rapid conduction principle of a two-phase interface, a proton-oxygen iron co-conduction BaSn0.5Y0.46Zn0.04O2.73 / Ce0.8Sm0.2O2.9 multiphase electrolyte material which is easy to sinter and high in electric conductivity and chemical stability is obtained.

The invention discloses a low-temperature solid oxide fuel cell based on a barium stannate / zinc oxide composite material. A cathode and an anode of the fuel cell are made of foamed nickel with the surface being coated with NCAL, and an electrolyte layer of the fuel cell is made of a BSO / ZnO composite material. The fuel cell structurally comprises foamed nickel / / NCAL / / BSO / ZnO / / NCAL / / foamed nickel.The low-temperature solid oxide fuel cell adopts the composite material of barium stannate which is of a perovskite structure and nano-zinc oxide as the electrolyte layer of the fuel cell, and the electrode polarization loss in the electrochemical reaction process of the fuel cell is greatly reduced; and in addition, the electrolyte material has good output power in the low-temperature stage, so that the solid oxide fuel cell adopting the electrolyte material can operate efficiently and steadily for a long term in the low-temperature stage (300-600 DEG C).

The invention discloses a full-transparent resistive random access memory and application of barium stannate on the aspect of using the barium stannate as a transparent material with the stable resistance changing characteristic and belongs to the technical field of a semiconductor nonvolatile memory. According to the invention, the resistive material is a large energy gap semiconductor transparent oxide barium stannate (BaSnO3) thin film; the resistive random access memory consists of a lower electrode, a resistive storage layer arranged on the lower electrode and an upper electrode deposited on the resistive storage layer; the upper electrode and the lower electrode are an indium tin oxid transparent conductive thin film and a fluorine-doped indium oxide transparent conductive thin film; and the resistive storage layer is a barium stannate (BaSnO3) thin film. The transparent organic resistive random access memory provided by the invention has the advantages of good light transmission, high storage density, high stability and the like and has wide application prospect.

The invention discloses a bismuth ferrite-lead titanate-barium stannate titanate ternary system high-temperature piezoelectric ceramic material and a preparation method thereof, wherein the chemical composition of the bismuth ferrite-lead titanate-barium stannate titanate ternary system high-temperature piezoelectric ceramic material is (1-x-y)BiFeO3-xPbTiO3-yBa(Sn1 / 5Ti4 / 5)O3+zMnCO3, x and y are molar ratios, x is greater than or equal to 0.20 and less than or equal to 0.26, y is greater than or equal to 0.13 and less than or equal to 0.18, and z is the weight ratio, and is greater than or equal to 0 and less than or equal to 0.15 wt% based on the total weight of the powder during synthesis of the ceramic material.

The invention discloses a flame resistant polypropylene cable material for urban rail transport and a preparation method thereof. The flame resistant polypropylene cable material is prepared from the following raw materials, by weight, 42-58 parts of polypropylene, 34-49 parts of polyetherimide, 18-27 parts of brominated polystyrene, 13-19 parts of ultrafine molybdenum powder, 8-14 parts of guaiac resin, 10-15 parts of epoxidized fatty acid methyl esters, 6-12 parts of diethylene glycol dibenzoate, 3-6 parts of Sasol wax, 2-4 parts of isopropyl myristate, 1-2 parts of stannous stearate, 4-8 parts of tri(2,3-dibromopropyl)tricarbimide ester, 15-20 parts of activated calcium carbonate, 5-10 parts of barium stannate, 2-3 parts of dibenzoyl methane, 15-20 parts of a composite flame retardant, 1-2 parts of an antioxidant 1135 and 1-2 parts of an antioxidant 330. The prepared cable material has good flame retardant efficiency and low smoke density, will not generate heavy smoke and harmful, toxic and corrosive gas when burned, is safe and environmentally-friendly, and has characteristics such as excellent physical and mechanical properties, electrical insulation property, fatigue resistance, heat resistance, weather fastness and the like.

The invention discloses a preparation method of a high-dielectric-constant gate oxide amorphous IGZO thin film transistor. Firstly, a layer of strontium titanate thin film with high dielectric property is prepared on a monocrystalline silicon substrate by utilizing a magnetron sputtering technology to serve as a gate oxide; then a layer of amorphous IGZO thin film with the semiconductor characteristic is prepared on an insulating barium stannate thin film; and finally, an ITO transparent conducting electrode is prepared through a magnetron sputtering technology so as to serve as a source electrode and a drain electrode of the transistor, wherein the silicon substrate serves as a grid electrode. The high-dielectric-constant strontium titanate thin film is adopted as the gate oxide insulating layer, so that the problem of overheating of the leakage current of the transistor caused by the traditional silicon oxide is effectively reduced, so that the stability and the service life of the transistor are improved and prolonged.

The invention belongs to the technical field of dye-sensitized solar cells, and specifically relates to a dual-surface treatment method for the photoelectric conversion efficiency of a barium-stannate-based dye-sensitized solar cell. The method comprises the steps: employing a water bath method for preparing pure-phase BaSnO3 nano particles, obtaining the pure-phase BaSnO3 nano particles, and applying the pure-phase BaSnO3 nano particles to the anode of the dye-sensitized solar cell; employing a chemical bath deposition method (CBD) and a TiCl4 solution immersion method for the surface treatment of a BaSnO3 nano particle anode film, taking a ruthenium-system dye N719 as a sensitizing agent for assembling the dye-sensitized solar cell, wherein the highest photoelectric conversion efficiencyof the dye-sensitized solar cell is 5.18% under the condition that the light intensity is 100Mw / cm2 and a condition of AM1.5. The method is simple in operation, is low in cost, but greatly improves the efficiency, and is higher in practicality.

The invention relates to novel barium stannate-lead titanate ferroelectric piezoelectric ceramics and a preparation method thereof, which belongs to the field of the ferroelectric piezoelectric ceramics. The ceramics is provided with a perofskite type structure, the chemical composition is (1-x)BaSnO3-xPbTiO3(x is larger than 0 and smaller than 1), and the range x of the morphotropic phase boundary (MPB) of the solid solution ceramic system is larger than or equal to 0.61 and smaller than or equal to 0.66. The ceramics is synthesized by the two-step synthesis method or the solid phase synthesis method. At room temperature, the Curie point of the material near the MPB is 140-200 DEG C, and the material has high piezoelectric constant d33(200-350pC / N), high electromechanical coupling factor kp (50-65 percent) and large deformation S(0.1-0.5 percent). The preparation technique is simple, and the cost is low; the product of the material has the advantages of high chemistry purity, good uniformity and controllable components.

The invention provides barium stannate composite silicon oxide aerogel powder and a preparation method thereof. The composition of the composite aerogel is xSiO2 + (1-x) BaSnO3, x is more than 0 and less than 1, and the composite aerogel comprises silicon oxide aerogel and barium stannate nanoparticles uniformly distributed in the silicon oxide aerogel. Silicon oxide aerogel is used as a hard template, barium stannate nanoparticles are uniformly distributed in the silicon oxide aerogel and have the nano-pore channel structure so that agglomeration of barium stannate can be prevented, and the properties such as small-size effect and surface / interface effect of nanocrystalline barium stannate can be fully exerted.

The invention discloses a negative electrode lead paste of a storage battery with super-strong charging acceptance and a preparation method of the negative electrode lead paste. The negative electrodelead paste comprises the following raw materials in percentage by mass: 0.1-1.0 weight percent of barium stannate, 0.3 to 0.5 weight percent of humic acid; 0.1 to 0.2 weight percent of azo anthraceneblue; 0.01 to 0.05 weight percent of Ketjen black; 0.1 to 0.3 weight percent of expanded graphite; 0.05 to 0.08 weight percent of carbon fiber; 0.1 to 0.5 weight percent of sodium carboxymethyl cellulose; 0.01 to 0.05 weight percent of perborate; 9-10 weight percent of dilute sulfuric acid; 10 to 12 weight percent of pure water; and the balance of lead powder with the oxidation degree of 71-73%.The storage battery produced by adopting the negative electrode lead plaster has relatively strong charging acceptance capability, so that the capacity of the storage battery is improved, and the service life of the storage battery is prolonged.

The invention discloses a photocatalyst taking barium stannate as a carrier to load cadmium sulfide quantum dots as well as a preparation method and application of the photocatalyst, wherein the supported photocatalyst is prepared by loading synthesized CdS QDs with negative charges on a BaSnO3 perovskite semiconductor carrier with light absorption and positive charges through electrostatic self-assembly. Compared with BaSnO3, the CdS QDs / BaSnO3 catalyst has the advantage that the performance and the stability of removing NO through photocatalysis under the condition of visible light and the selectivity of NO3<-> are obviously improved. According to the present invention, the CdS QDs are loaded on the BaSnO3 carrier through an electrostatic self-assembly method, so that the preparation method is simple and easy to implement and is more beneficial to popularization and application.

The invention discloses a method for reducing dielectric loss of a titanium barium stannate system in a reducing atmosphere. The method comprises the following steps: firstly, weighing and blending materials of BaTiO3, SnO2 and BaCO3 according to a formula Ba(SnxTi1-x)O3, in the formula, x is greater than 0 and less than or equal to 0.3; carrying out ball milling, drying and screening, calcining at 1050 DEG C, and synthesizing a main crystal phase; further carrying out secondary ball milling, and pelletizing with an adhesive; further pressing a pelletizing powder material into a blank, degumming the blank, and sintering at 1350-1450 DEG C in a reducing atmosphere, thereby obtaining a low-loss titanium barium stannate medium material in the reducing atmosphere. Due to addition of a secondary ball milling process, the dielectric loss of the titanium barium stannate system is reduced to 0.5-4.0% from 1.0-5.0% of the prior art, so that the properties of a multi-layer flaky ceramic capacitor are greatly improved.

The invention discloses a composite passivating agent for a copper alloy metal plate, and belongs to the technical field of surface passivating treatment. The composite passivating agent is prepared from the following components in percentage by mass: 5 to 15% of sodium alginate, 0.5 to 3% of N-methyl-isothiazolinone and 5-chloro-N-methyl-isothiazolinone mixture, 0.5 to 3% of calcium propionate, 0.5 to 2% of isooctyl glucoside, 0.05 to 0.5% of high-carbon alcohol fatty acid ester complex, 0.05 to 0.3% of ethylene oxide and high-grade fatty alcohol mixture, 0.1 to 2% of barium stannate nanorod,and the balance of water, wherein the diameter of each barium stannate nanorod is 20 to 100nm, and the length is 500nm to 1mu m. The composite passivating agent has the advantages that the pretreatment before use is not required; after passivated by the composite passivating agent, the copper alloy metal plate has good salt resistance, weather resistance, water resistance, acid resistance, alkaline resistance, solvent resistance, fingerprint resistance and lubricating property.

The invention discloses a barium stannate nano-tube gas-sensitive material with high gas sensitive selection on acetic acid gas, and belongs to the technical field of gas sensitive materials. The material is prepared from barium stannate nano-tubes by an electrospinning method and has a length of about 10-100 microns and radius of 500-1000 nanometers, and the nano-tube wall is formed by barium stannate particles having the average particle size of 50nm. A heater type gas sensitive element prepared by using the material as a sensitive material has the sensitivity on 1000pm acetic acid being 91-96.8, the detection limit on acetic acid being as low as 0.3ppm and the response and recovery time on 0.3-1000ppm acetic acid gas being respectively not more than 50s when the working temperature is 245 DEG C, and has the sensitivity on 1000ppm alcohol and acetone being lower than 6.7 at the same working temperature of 245 DEG C, so that the barium stannate nano-tube gas-sensitive material has high gas sensitive selection on acetic acid gas.

The invention relates to chromium doped barium stannate nano-powder with adjustable energy gap and a preparation method thereof. The chromium doped barium stannate nano-powder has a chemical composition of BaSn(1-x)CrxO3, wherein x is more than 0 and less than or equal to 0.5; and the energy gap of the powder is adjusted by doping chromium.

The invention discloses high-strength magnesium jade porcelain which is characterized by comprising the following substances in parts by weight: 35-50 parts of magnesium clay, 25-36 parts of frit, 3-7 parts of monocalcium phosphate, 2-9 parts of superphosphate, 10-18 parts of stearic acid, 5-8 parts of chlorinated paraffin, 5-8 parts of polyacrylate, 11-18 parts of aluminum oxide, 9-12 parts of silicon carbide, 20-46 parts of talc, 1-4 parts of barium stannate, 11-21 parts of calcium carbonate, 1-3.5 parts of sodium carboxymethylcellulose, 15-29 parts of magnesite, 20-30 parts of albite and 3-11 parts of magnesium carbonate. The high-strength magnesium jade porcelain has the beneficial effects that once-firing is realized, and the problem that the product generated by firing temperature of lots of adopted talc materials is low in regularity and thermal shock resistance is solved and improved. Moreover, reasonable raw materials and blank formula and the production process are the basis of realizing once-firing of the magnesium jade porcelain and are also key points of solving the problems of extruding and molding difficulty and low strength of the fired product.

The invention provides a yellow long-afterglow luminescent material and relates to the field of novel inorganic functional materials. The yellow long-afterglow luminescent material is characterized inthat germanium barium stannate is used as a substrate of the luminescent material and a trivalent rare-earth ion Dy<3+> is used as an activating agent; an expression formula of the yellow long-afterglow luminescent material is as follows: Ba1-xSnGe3O9:xDy<3+> or Ba1-x-ySnGe3O9:xDy<3+>,yRe, wherein Re is selected from one or more of La<3+>, Ce<3+>, Pr<3+>, Nn<3+>, Sm<3+>, Eu<3+>, Gd<3+>, Tb<3+>, Ho<3+>, Yb<3+>, Lu<3+> and Er<3+>; x is greater than or equal to 0.0005 and less than or equal to 0.05; and y is greater than or equal to 0.0005 and less than or equal to 0.05. The material can emit yellow afterglow visible to naked eyes and has the advantages of relatively strong afterglow strength, relatively slow afterglow attenuation and relatively long afterglow lasting time. The invention further discloses a preparation method of the yellow long-afterglow luminescent material; the preparation method has the advantages of simple preparation technology, easiness for controlling conditions and low equipment requirements; and no toxic gas is generated in a preparation process and pollution to the environment is not caused.

The invention relates to a chromium-doped barium stannate nanoporous film with an adjustable band gap width and a preparation method thereof. The nanoporous film is obtained by coating a substrate with a precursor colloid solution obtained by mixing chromium-doped barium stannate nanoparticles with an organic solvent and then subjecting the substrate to heat treatment. The inorganic component of the chromium-doped barium stannate nanoporous film is BaSn1-xCrxO3, wherein 0<=x<=0.5.

The invention relates to a preparation method of a crystalline barium stannate film, in particular to a method for preparing the crystalline barium stannate film by using a magnetic field enhancement technology. The crystalline barium stannate film is obtained by depositing on a room-temperature substrate by using a substrate magnetic field enhancement type magnetron sputtering technology; and the crystallization process of the barium stannate film can be realized on various transparent and non-transparent materials such as transparent glass and silicon wafers. The method comprises the steps of 1, cleaning a substrate; 2, performing room-temperature magnetron sputtering coating to obtain an amorphous barium stannate film; 2.1, vacuumizing by using a mechanical pump and a molecular pump; 2.2, pre-sputtering a barium stannate ceramic target material for 10 minutes; 2.3, adjusting the radio frequency power to be within the range of 30-80 watts, and adjusting the gas atmosphere in the vacuum to be mixed gas of argon and oxygen, wherein the oxygen partial pressure ratio of the mixed gas is made to be 30-70%, and the vacuum degree is maintained to be 0.1-3 Pa; and 3, performing magnetron sputtering coating by using a room-temperature substrate magnetic field enhancement technology to obtain the crystalline barium stannate film.

The present invention provides photoluminescent iron-doped barium stannate materials absorbing ultraviolet (UV) light and exhibiting strong near-infrared (NIR) luminescence. Such materials exhibit increased integrated photoluminescence intensity in comparison to known BaSnO3 and iron-doped barium stannate materials, and therefore they are particularly useful for the production of photoluminescent security ink compositions and transparent covert security features with improved anti-counterfeiting resistance that can be used for protection of documents and articles against counterfeit and illegal reproduction.