333 results about "Gadolinium oxide" patented technology

A stable substantially cubic perovskite crystalline structure of at least one strontium-doped lanthanum cobalt oxide (LSC) having a stabilizing amount of at least one cerium gadolinium oxide (CGO) therein.

The invention relates to a transparent ceramic scintillator material containing lutecium oxide-gadolinium oxide solid solution as matrix and a production method thereof. The method comprises the steps of powder synthesis, molding, bisque firing, sintering and annealing treatment. The transparent ceramic scintillator material containing lutecium oxide-gadolinium oxide solid solution as matrix has a visible light linear transmittance more than 60% and good mechanical property, and can be used as matrix material for scintillators. The invention can improve the blocking ability of the gadolinium oxide matrix against ionization radiation, improve the scintillation property of Gd2O3 and reduce the production cost of Lu2O3; and has good application prospect in the field of scintillation radiation detection.

This invention relates to transparent polycrystalline ceramic scintillators and methods of preparing the same. The invention also relates to gadolinium-yttrium oxide ceramic scintillators with europium added as an activator, which are optically transparent and whose cubic structures are maintained even when gadolinium oxide constitutes more than 50% of the scintillator. The scintillators of the present invention also have high light yield due to excellent luminescent characteristics in the visible light region.

Certain example embodiments relate to a coated article including at least one infrared (IR) reflecting layer in a low-E coating. In certain examples, at least one layer of the coating is of or includes zirconium oxide (e.g., ZrO₂) doped with gadolinium and/or gadolinium oxide (e.g., Gd₂O₃ or other suitable stoichiometry). Providing a layer including Gd-doped zirconium oxide as the uppermost or overcoat layer of the coated article (e.g., over a silicon nitride based layer) advantageously results in improved durability, and chemical and heat stability in certain example embodiments. Coated articles herein may be used in the context of insulating glass (IG) window units, vehicle windows, or in other suitable applications such as monolithic window applications, laminated windows, and/or the like.

A sintered ceramic for a scintillator having a composition represented by the general formula of Gd3-xCexAlySizGa5-y-zO12, wherein 0.001<=x<=0.05, 1<=y<=4, and 0.0015<=z<=0.03, is produced by mixing gadolinium oxide, aluminum oxide, gallium oxide, a cerium salt, a silicon compound and a fluorine compound in such proportions as to provide the above composition; calcining the resultant mixture at a temperature of 1400-1600° C.; disintegrating the resultant calcined body to ceramic powder; pressing the ceramic powder to provide a green body; and sintering the green body at a temperature of 1600-1700° C. in a non-oxidizing atmosphere at 5x104 Pa or more, and optionally further by hot isostatic pressing at a temperature of 1400-1600° C. in an argon atmosphere.

The invention discloses a gradient type macromolecule-based neutron absorption grid tray material which comprises a fast neutron slow absorption layer, an intermediate energy neutron absorption layer and a heat neutron absorption layer, wherein the three absorption layers are formed by gradient lamination; a neutron absorption body material doped in the fast neutron slow absorption layer is a lithium fluoride, lithium hydride or boron carbide absorption body material; a neutron absorption body material doped in the intermediate energy neutron absorption layer is a samarium oxide neutron absorption body material; a neutron absorption body material doped in the heat neutron absorption layer is a gadolinium oxide or cadmium oxide neutron absorption body material. The invention also discloses a preparation method of the gradient type macromolecule-based neutron absorption grid tray material. The gradient type macromolecule-based neutron absorption grid tray material has the characteristics of high absorption efficiency, long service life, high mechanical property, simple technology and the like, has a certain absorption effect on gamma photons, can be used for spent fuel storage and neutron sources of other types and has a wide application prospect.

The invention discloses a high-abrasion-resistance hydraulic sealing gasket and a preparation method thereof. The high-abrasion-resistance hydraulic sealing gasket is prepared from nitrile-butadiene rubber, ethylene propylene diene monomer, EVA (ethylene-vinyl acetate) resin, epoxy octyl stearate, terpene resin, diphenyl toluene phosphate, organic montmorillonite, modified nano ceramic, cerium oxide, gadolinium oxide, zinc oxide, barium stearate, calcium stearate, titanium white, nano bauxite and other raw materials. By performing organic composite modification with nano aluminum nitride, nano titanium carbide, nano zirconium boride and many types of nano ceramic powder, the compatibility with rubber can be enhanced; and when being used for filling a modified rubber material to prepare the sealing gasket, the modified nano ceramic powder can obviously enhance the heat resistance, abrasion resistance, mechanical strength and other properties of the sealing gasket. The rare-earth metal oxides (cerium oxide and gadolinium oxide) are added to enhance the aging resistance of the rubber.

The invention discloses a full extracting process for preparing ultra-pure gadolinium oxide and a product thereof. Compared with the traditional ion exchange and chromatography extraction method, the process has the characteristics of large yield and low cost. The primary-pure gadolinium oxide (Gd2O3 at the grade of 99.99 percent) is obtained in advance by adopting a rough gadolinium enriching substance (Gd3O3 at the grade of 10-90 percent) as a raw material and adopting a mixed extracting agent of P507 and P204 through optimized control of factors, such as material liquid concentration, grade, phase ratio, acidity, and the like and classical extraction and separation in two steps; then the electrochemical reduction and the fully-closed type extraction and separation are performed for carrying out deep purification, and trace rare-earth element impurities are removed; and finally, the ultra-pure gadolinium oxide product with the rare-earth impurity content below 0.5ppm is obtained.

The invention relates to a dense lanthanum flint optical glass as well as a preparation method and an optical element thereof. The dense lanthanum flint optical glass is prepared from the following components in percentage by weight: 5.5 to 8% of SiO2 (silicon dioxide), 22 to 27% of B2O3 (boric oxide), 42 to 49% of La2O3 (lanthanum oxide), 0.1 to 2.9% of ZnO (zinc oxide), 7 to 9% of ZrO2 (zirconium dioxide), 3.1 to 6% of Nb2O3 (niobium oxide), 6 to 8% of Y2O3 (yttrium oxide), 1 to 8% of Gd2O3 (gadolinium oxide), and 0.01 to 0.1% of Sb2O3 (antimonous oxide). The dense lanthanum flint optical glass has the advantages that the reflectivity nd is between 1.801 and 1.821, and the abbe number upsilond is between 46 and 49; the chemical stability and coloring degree are good; the specific weight is lower, and the weights of a glass element and an optical system are reduced; the crystallizing temperature is lower, and the batched production is easily realized.

The invention relates to compact 10 B boron carbide-rich ceramics, which is prepared from the following raw materials in part by mass: 84 to 95 parts of 10 B boron carbide-rich powder, 1 to 6 parts of europium oxide, 0 to 4 parts of samarium oxide, 0 to 3 parts of gadolinium oxide, 1 to 3 parts of zirconium oxide and 1 to 3 parts aluminum oxide. The ceramics is prepared by the following steps of: ballmilling and molding the raw materials; and sintering the raw materials at the highest sintering temperature of between 2,000 and 2,250 DEG C. The compact 10 B boron carbide-rich ceramics has the characteristics of high neutron absorptivity, high strength and high compactness, and can be used as ceramic materials of control rods, regulating rods, emergency rods, safety rods, and shielding rods of nuclear reactors.

The invention relates to a cerium, gadolinium activated yttrium aluminium garnet fluorescent powder and preparation method, wherein the fluorescent powder is prepared from yttrium oxide, aluminium oxide, cerium oxide, gadolinium oxide, boric acid, barium fluoride, carbon powder, anhydrous alcohol as raw material, cerium oxide, gadolinium oxide and water as activating agent, boric acid and barium fluoride as fluxing agent, anhydrous alcohol as ball grinding medium, carbon powder as reducing agent through raw material mixing, grinding, ball grinding, calcining in high temperature pipe heater, cooling down, grinding, sieving, detecting, packaging and storing.

The method discloses a low-temperature catalytic combustion eliminating catalyst of volatile chloro aryl hydrocarbons, the catalyst is mainly composed of an alumina support modified by alkaline-earth metal, and loaded rare earth oxide and transition metallic oxide thereof; wherein the alkaline-earth metallic oxide includes magnesium oxide and barium oxide, the transition metallic oxide include one or more kinds of copper oxide, ferric oxide, vanadium pentoxide, manganese oxide, cobalt oxide and tungsten oxide, and the rare earth oxide is one or more kinds of lanthana oxide, cerium oxide, neodymium oxide and gadolinium oxide. The catalyst has high catalytic activity and no by-product generation, does not cause secondary pollution, and has strong anti-chlorin poisoning capacity and long catalyst life, and is particularly suitable for low-temperature catalytic combustion for removing halogen-contained organic compounds, especially for removing volatile chloro aryl hydrocarbon pollutants.

The invention provides artificial gemstones and a preparation method thereof. Polycrystalline transparent gemstone raw materials which are prepared by a powder preparation method are used as raw materials of the artificial gemstones. The preparation method of the artificial gemstones comprises the following steps: high-purity oxide micro powder which employs aluminum oxide, magnesium oxide, yttrium oxide, zirconium oxide, gadolinium oxide and gallium oxide as substrate raw materials is used; a proper amount of coloring metal oxides or metal salts are added, or coloring elements are not added; uniform mixing, moulding, sintering, cutting, engraving, polishing and burnishing are carried out, various monochromatic or polychromatic polycrystalline transparent colored gemstones with high refractive index and high hardness are prepared, or polycrystalline colorless transparent artificial gemstones with high refractive index and high hardness are prepared. The method has the advantages of low producing cost, relatively simple process, low production equipment investment and operation cost, easy realization of large batch production, flexible and changeable products, strong market competitiveness, etc.

The invention relates to a piece of silver-plated cloth with a rare earth-shielding composite layer, comprising a piece of silver-plated cloth. The silver-plated cloth is characterized by comprising the rare earth-shielding composite layer, and the rare earth-shielding composite layer is formed by dissolving the following components in a solvent by mass percentage: 50-70 parts of rare earth and 30-50 parts of composite, wherein the composite comprises the following components by mass percentage: 6-10 parts of monoatomic carbon, 6-10 parts of boron nitride, 6-10 parts of boron carbide, 6-10 parts of neodymium oxide, gadolinium oxide and erbium oxide as well as 6-10 parts of barium sulfate. The silver-plated cloth with the rare earth-shielding composite layer can effectively shield various ionizing rays (x, alpha, beta or gamma) as well as electromagnetic radiation, and also has the function of shielding infrared rays; and the cloth achieves light weight and softness, and can be applied to the ray shielding of the fields of frocks, war industry, operations, electricians, and the like. The invention also relates to a method for preparing the silver-plated cloth with the rare earth-shielding composite layer and silver-plated clothes with the rare earth-shielding composite layer.

The invention relates to a high nuclear gadolinium cluster complex with a large magnetocaloric effect. The chemical formula is C110H82Gd10O56S22 which belongs to the triclinic system, and the space group is P-1. The preparation method comprises the steps of: placing gadolinium oxide, thiophene-3-carboxylic acid and water into a stainless steel reaction kettle and mixing uniformly; then, reacting for 72 hours at 150-170 DEG G; cooling to 20 DEG C to obtain block crystals; collecting the crystals and washing the crystals with water and ethanol; and vacuum drying to obtain the target product: high nuclear gadolinium cluster complex. The invention has the advantages that according to the preparation method based on large self-rotating ground state of gadolinium ions, weaker magnetic interaction among metals and larger metal ligand proportion, the high nuclear gadolinium cluster complex with the large magnetocaloric effect is prepared; the raw materials are simple and cheap to the benefit of large-scale production; and the complex has the large magnetocaloric effect, and has a huge potential application value in the aspect of magnetic refrigeration.

The present invention discloses a method for preparing a fluorapatite ceramic solidified body. The method is characterized by comprising the steps of: taking and mixing 23-76 wt.% of calcium pyrophosphate, 8-26 wt.% of calcium fluoride, 0. 02-52wt.% of samarium oxide (europium oxide, gadolinium oxide), 0-15 wt.% of sodium carbonate, 0-16 wt.% of silica to obtain a mixture; grinding, drying, granulating, molding, discharging rubber and conducting vacuum hot pressing sintering on the mixture to obtain a fluorapatite ceramic solidified body. The method not only utilizes the phosphorus in high-level radioactive waste in a recycling way, but also can address the problem of low solubility of phosphorus and minor actinides nuclide in glass solidified body. The fluorapatite ceramic cured body prepared by the invention has excellent preparation geological stability, irradiation stability, mechanical stability, chemical stability and thermal stability, and can be used as a ceramic solidified body for safe treatment of minor actinides high-level radioactive waste with high toxicity, long half-life period and strong radioactivity.

A preparation method for magnetic resonance imaging contrast medium gadobutrol comprises the following steps: taking THF as a solvent, taking boron-protected 1, 4, 7, 10-tetraazacyclododecane (I) and 4, 4-dimehtyl-3, 5, 8-trioxabicyclo[5.1.0]octane (II) as raw materials, activating the raw materials by sodium hydride and performing ring-opening condensation to obtain an intermediate (III), performing mild hydrolysis to obtain an intermediate (IV), then successively reacting the intermediate (IV) with chloroacetic acid or bromoacetic acid and gadolinium oxide to prepare gadobutrol, performing desalting on the crude product, recrystallizing to obtain gadobutrol pure product. The preparation method comprises the beneficial effects of being mild in reaction condition, high in selectivity, relatively low in apparatus requirement, simple in technological operation, high in total yield, high in product purity, simple in purification, low in environment protection pressure, and relatively suitable for industrial production.

The invention discloses a catalyst used for the removal of volatile chlorination aromatic hydrocarbon by lower-temperature catalytic combustion; the catalyst is essentially composed of alumina carrier and rare earth oxide and transition metal oxide loaded on the alumina carrier; wherein, transition metal elements are Cu, Fe, V, Mn, Mo, Co and W, and the rare earth oxide is one or a plurality of lanthana, cerium oxide, neodymia and gadolinium oxide. The catalyst of the invention has high activity, no byproduct generated, no secondary pollution, strong capacity of chlorine poisoning resistance and long service life and is especially suitable for removing halogen-containing organic compounds by lower-temperature catalytic combustion, more particularly, volatile chlorine-containing aromatic hydrocarbon pollutants.

The invention discloses a composite doped cerium oxide electrolyte and its preparation method, which is compound of cerium oxide, gadolinium oxide and yttrium oxide with stoichiometric ratio of Ce1-xGdx-yYyO2-0.5x, in which, 0.1<=x<=0.2, 0 H01M 8/02 H01B 1/08 C01F 17/00 B01J 19/00 H01M 8/10 2 6 1 2006/12/22 101000966 2007/7/18 100449835 2009/1/7 2009/1/7 2009/1/7 Tsinghua Univ. Beijing 100084 Zhou Heping Guang Xiangfeng Liu Zhihui Wang Yanan Zhang Jun guanchang renfeng hua 11245

A preparation method of gadolinium oxide-coated ferroferric oxide magnetic fluorescent nano hollow spheres is provided; a hard template method is utilized, silica with different inner diameters is used as a template, ferric hydroxide is precipitated on a silica gel, then the treated silica gel is used as the template and then is coated with rare earth gadolinium, and thus the Gd2O3-coated Fe3O4 magnetic fluorescent nano hollow spheres with different particle diameter sizes are obtained. The preparation method has the advantages of simple process, low cost and good repeatability, is suitable for large-scale production, and avoids influences brought by magnetic particle agglomeration. The prepared hollow spheres have relatively larger specific surface area; the adjustable range of the particle size is larger, and the adjustable field of the size of the hollow spheres is broadened; meanwhile, the hollow spheres have magnetic and fluorescent properties, enables the orientation to be controlled by adding a magnetic field, and can be used as a drug carrier having perspective optical performance so as to intuitively understood drug moving directions; and the hollow spheres are easily broken under the action of an external force or disturbances, and can be used for contrast agents, biomarkers, magnetic resonance imaging (MRI), and biological and biomedical imaging.

The invention relates to a red long afterglow luminescent material and preparation thereof; the red long afterglow luminescent material takes Gd2O2S as a matrix and Eu as an activator and appropriately intermingles TiO2; MgO is codoped with TiO2; and SiO2 is codoped with TiO2. The composition thereof is Gd2O2S:Eu, Ti; Gd2O2S:Eu, Mg, Ti or Gd2O2S:Eu, Si, and Ti . The mass percentage content of each raw material to prepare the luminescent material is as follows: 32.27 percent to 33.98 percent of gadolinium oxide; 1.02 percent to 2.73 percent of europia, 32.0 percent to 38.0 percent of sulfur, 23.1 percent to 28.2 percent of anhydrous sodium carbonate, 3.9 percent to 4.8 percent of lithium carbonate, 0 to 0.58 percent of magnesia, 0 to 0.87 percent of silicon dioxide and 0.19 percent to 1.15 percent of titanic oxide; in addition, the mole ratio of gadolinium oxide and europia is that: n(Gd#-(2O3)):n(Eu#-(2O3)) equals to 11.50 to 32.33. The roasting temperature is 1240 DEG C to 1280 DEG C, and the heat preserving time is 2.0 to 3.0h. The emission peak value of the luminescent material is about 627nm. Through the irradiation of an ultraviolet lamp or visible light (such as the ray of the sun and a fluorescent lamp), the red long afterglow luminescent material is characterized by obvious, bright and pure red long afterglow luminescence, and can be used for emergency indicating lights, such as emergency exit direction for crowd evacuation when service interruption occurs in the public places, fire exit signs, red alert of other specific occasions, etc.

The invention discloses a neutron filter material and a preparation method thereof. The preparation method comprises 1, orderly carrying out primary compacting molding, sintering and hot isostatic pressure molding on an epithermal neutron filter material, or 2, putting the epithermal neutron filter material into a jacket and carrying out hot isostatic pressure molding, wherein the epithermal neutron filter material comprises at least one of tungsten powder, aluminum powder, titanium powder, boron carbide, titanium oxide, lithium fluoride, aluminum fluoride, gadolinium oxide, gadolinium fluoride, boron nitride, boron oxide, zirconium boride, titanium boride and lithium oxide powder. The neutron filter material has the advantages that 1, the neutron filter material has outstanding filterability and provides a specific energy section and especially provides a neutron beam of an epithermal neutron energy section, 2, the preparation method is reliable, product performances are outstanding, and in boron neutron capture therapy device use, the epithermal neutron filtration satisfies apparatus design indexes, and 3, the large-scale thick neutron filter material can be prepared and machining can be realized.

The invention relates to an intestinal-tract targeted magnetic resonance contrast agent based on mesoporous silica and a preparation method thereof. The method takes mesoporous silica as a medium, mesoporous silica pore passages are loaded with gadolinium oxide nanoparticles, then the loaded mesoporous silica surface is coated with chitosan molecules, the intestinal-tract targeted contrast agent is prepared, and intestinal-tract targeted imaging is realized. The contrast agent takes mesoporous silica as the medium, and can regulate and control the content of gadolinium oxide, so as to realize different intensities of contrast effects; and at the same time, the mesoporous silica surface is coated with the chitosan, so that the contrast agent is allowed to have a targeting effect on intestinal tracts. The prepared contrast agent has the characteristics of stable performance, good biocompatibility, and adjustable magnetic resonance signals. The obtained product can meet the demand of clinical application. The preparation method is simple in process and strong in operability, and can further meet production and application.