34results about "Rare earth metal oxyhalides" patented technology

Crystalline scintillator materials comprising nano-scale particles of metal halides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In these methods, ionic liquids are used in place of water to allow precipitation of the final product. In one method, the metal precursors and halide salts are dissolved in separate ionic liquids to form solutions, which are then combined to form the nano-crystalline end product. In the other methods, micro-emulsions are formed using ionic liquids to control particle size.

Crystalline scintillator materials comprising nano-scale particles of metal oxides, metal oxyhalides and metal oxysulfides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In one method, used to form oxyhalides and oxysulfides, metal salts are dissolved in water, and then precipitated out as fine particles using an aqueous base. After the particles are separated from the solution, they are annealed under a flow of a water saturated hydrogen anion gas, such as HCl or H₂S, to form the crystalline scintillator particles. The other methods take advantage of the characteristics of microemulsion solutions to control droplet size, and, thus, the particle size of the final nano-particles. For example, in one method, a first micro-emulsion containing metal salts if formed. The first micro-emulsion is mixed with an aqueous base in a second micro-emulsion to form the final nano-scale particles.

The invention discloses a preparation method of cerium dioxide fluoride polishing powder under a microwave condition, which belongs to the technical field of nano rare earth material preparation. Thepreparation method comprises the following steps: dissolving Ce(NO3)3.6H2O in deionized water, preheating in a microwave mode, and adding NH4F; dissolving NH4HCO3 in deionized water, adding a preheated Ce(NO3)3.6H2O and NH4F mixed solution into the deionized water, carrying out a constant-temperature precipitation reaction under a microwave condition to generate a Ce2(CO3)3 precursor, and continuing to age the Ce2(CO3)3 precursor; filtering the precursor reaction solution to obtain a precipitate, drying at a constant temperature, and grinding into powder; and roasting the precursor powder to prepare cerium dioxide fluoride polishing powder. The cerium dioxide powder prepared by the method disclosed by the invention is high in particle crystallinity, regular and spherical in morphology, uniform in particle size distribution and good in dispersity, and the polishing efficiency and the polishing precision of the fluorinated cerium dioxide powder are further improved.

The invention discloses a molten salt synthesis method of rare earth oxyfluoride with a cubic crystal form. The method comprises the following steps: mixing rare earth oxide and rare earth fluoride toobtain a rare earth mixture, uniformly mixing the rare earth mixture with alkali metal fluoride and/or alkaline-earth metal fluoride, heating to a temperature higher than the melting point of the mixed fluoride, keeping the temperature for a preset time, and cooling to obtain the rare earth oxyfluoride with the cubic crystal form. According to the synthesis method of rare earth oxyfluoride, the cubic crystal structure of the rare earth oxyfluoride at high temperature can be reserved without quenching, inert atmosphere or reducing atmosphere is not needed as protective atmosphere, the molten salt synthesis reaction rate is far higher than the traditional solid-phase synthesis reaction rate, and the method has the characteristics of simple synthesis process, high synthesis efficiency and low cost.

A method for separating and recovering a plurality of rare-earth elements, the method including a step of introducing, into a liquid, a mixture containing a rare-earth oxychloride and a rare-earth chloride, the rare-earth oxychloride constituted from a rare-earth element different from a rare-earth element constituting the rare-earth chloride, thereby obtaining an insoluble matter containing the rare-earth oxychloride and a liquid in which the rare-earth chloride is dissolved, a step of recovering the rare-earth oxychloride from the insoluble matter, and a step of recovering the rare-earth chloride from the liquid in which the rare-earth chloride is dissolved.

The present invention provides a method of producing a nanoparticle dispersion liquid, including: altering a surface of a nanoparticle in the presence of an ion by contacting a complex that includes the nanoparticle and a solid material present around the nanoparticle with a surface altering agent-containing liquid, that includes a surface altering agent for altering the surface of the nanoparticle and a solvent for dissolving the solid material and that has a viscosity of 1.10 mPa·s or more at 25° C.; and a dispersing step of dispersing the surface-altered nanoparticle in the solvent.

Particle powder, a number greater than 95% of the particles having a circularity greater than or equal to 0.85, the powder containing more than 99.8% of a rare earth oxide and/or a hafnium oxide and/or an aluminium oxide, as a percentage by weight on the basis of the oxides, and having: a median particle size D50 less than 15 [Mu]m, a 90th percentile of the particle sizes D90 less than 30 [Mu]m, and a size dispersion index (D90 -D10)/D10 less than 2; and a relative density greater than 90%.

An yttrium oxyfluoride is represented by YOF and is stabilized by a fluoride represented by CaF₂. Preferably, the number of moles of Ca with respect to 100 mol of yttrium is from 8 to 40 mol. A powder material is made of a first powder mixture including a calcium fluoride powder represented by CaF₂ and an yttrium oxyfluoride powder represented by YOF, or a second powder mixture including a calcium fluoride powder represented by CaF₂, an yttrium fluoride powder represented by YF₃, and an yttrium oxide powder represented by Y₂O₃. A production method involves firing a molded product of the first or second powder mixture under predetermined conditions.

The invention discloses a method for preparing transparent ceramic through one-time forming based on a photocuring 3D printing technology. The method comprises the following steps: providing an oxide ceramic powder raw material; providing photosensitive resin, a photoinitiator, a dispersing agent, a sintering aid and grinding balls; putting the oxide ceramic powder raw material, photosensitive resin, a photoinitiator, a dispersing agent, a sintering aid and grinding balls into a ball milling tank, carrying out ball milling and mixing to obtain photosensitive ceramic slurry, and carrying out stirring and ball milling on the photosensitive ceramic slurry to increase the solid phase content of the photosensitive ceramic slurry to more than 55 vol%; providing photocuring 3D printing forming equipment; spraying and cleaning the surface of the biscuit by using the alcohol and pure water; carrying out glue removal on the biscuit; and sintering the degreased green body in a vacuum atmosphere at a high temperature, and annealing to obtain the unpolished transparent ceramic component. According to the method, the high-transmittance transparent ceramic can be directly obtained through vacuum sintering, and isostatic pressing treatment is not needed.

The invention relates to a process for manufacturing an oxychloride or oxide of actinide(s) and/or of lanthanide(s) from a chloride of actinide(s) and/or of lanthanide(s) present in a medium comprising at least one molten salt of chloride type comprising a step of bringing said chloride of actinide(s) and/or lanthanide(s) present in said medium comprising at least one molten salt of chloride type into contact with a wet inert gas.

Provided is a spray coating containing a rare earth fluoride and/or a rare earth acid fluoride, wherein carbon is contained therein at 0.01-2% by mass or titanium or molybdenum is contained therein at1-1000 ppm, and wherein, in the case in which an acid fluoride is not contained therein, the spray coating is gray to black in which, in terms of the L*a*b* chromaticity, L* is 25-64, a* is -3.0 to +5.0, and b* is -4.0 to +8.0, and, in the case in which an acid fluoride is contained therein, the spray coating is white or gray to black in which, in terms of the L*a*b* chromaticity, L* is equal toor greater than 25 and less than 91, a* is -3.0 to +5.0, and b* is -6.0 to +8.0. By forming this coating on a plasma resistant member, a partial color change is reduced, the situation in which said member is washed in a manner that causes partial deterioration thereof when being removed and washed is eliminated, and thus, a member that is capable of reliably realizing the original longevity thereof is obtained.

The invention discloses a samarium oxychloride nanosheet and its preparation method and application. Its structure is an amorphous smoky two-dimensional samarium oxychloride nanosheet. The preparation process is as follows: (1) first trishydroxymethylaminomethane and Mix hydrochloric acid to obtain a buffer solution, then add a soluble samarium source and graphene oxide for ultrasonic treatment to obtain a uniformly dispersed suspension, and obtain a precursor after solid-liquid separation and drying after the reaction; (2) the precursor is burned at 500-600°C Burn to get samarium oxide nanosheets. The inventive amorphous smoky two-dimensional samarium oxychloride nanosheets are used as photocatalytic N ₂ and H ₂ When O reacts to synthesize ammonia, it does not need to add any sacrificial agent, and reacts NH at room temperature ₃ The yield reached 426μmol·g _cat. ^–1 h ^–1 , for the rational design of photocatalytic N ₂ Fixed high-efficiency catalysts improve new ideas.

The invention discloses a method for rapid in-situ preparation of a rare earth fluoride-rare earth oxide heterojunction micro-nano material, which utilizes the plasmon heat effect of a noble metal nano structure, takes a small-size gold nano island structure with a large absorption interface as a heat source, under the action of an external light field with resonant wavelength, the gold nano island structure generates an extremely high temperature in an extremely short time, and the extremely high temperature is transmitted to the rare earth luminescent material, so that the local temperature of the rare earth luminescent material is instantly increased; meanwhile, hot electrons generated by surface plasmon relaxation catalyze oxygen molecules adsorbed on the surface of the luminescent material to activate the oxygen molecules, so that oxidation reaction of the luminescent material is promoted, and the luminescent material is instantaneously phase-changed into rare earth oxide under the dual effects of instantaneous high temperature and activated oxygen. The surface plasmon heat effect is utilized, preparation of the heterojunction micro-nano material formed by combining the rare earth fluoride and the rare earth oxide which are not matched in crystal lattices is achieved on the single-particle level, the method is simple and easy to implement, the method can be carried out at the room temperature, the reaction time is short, and the needed exciting light power density is small.

A thermal spray material that enables a thermal sprayed coating, which is capable of exhibiting the same performances as those of the related art, to be obtained more easily than the related art, and a method for forming a thermal sprayed coating using the thermal spray material are provided.

A thermal spray material which for forming a thermal sprayed coating containing a rare-earth oxyhalide includes a rare-earth halide powder and a rare-earth oxide powder.

Provided is a slurry for suspension plasma spraying, which is a spray material used for suspension plasma spraying in an atmosphere including an oxygen-containing gas, contains 5-40 mass % of rare earth fluoride particles having a maximum particle diameter (D100) of 12 μm or less, and contains one or more types of solvent selected from among water and organic solvents. A rare earth acid fluoride-containing sprayed film, in which process shift and particle generation hardly occur, can be stably formed on a base material by carrying out suspension plasma spraying in an atmosphere including an oxygen-containing gas. A spraying member provided with this sprayed film exhibits excellent corrosion resistance to halogen-based gas plasma.