40 results about "Holmium(III) oxide" patented technology

A compact single frequency, single-mode 2 μm fiber laser with narrow linewidth, <100 kHz and preferably <100 kHz, is formed with a low phonon energy glass doped with triply ionized rare-earth thulium and / or holmium oxide and fiber gratings formed in sections of passive silica fiber and fused thereto. Formation of the gratings in passive silica fiber both facilitates splicing to other optical components and reduces noise thus improving linewidth. An increased doping concentration of 0.5 to 15 wt. % for thulium, holmium or mixtures thereof produces adequate gain, hence output power levels for fiber lengths less than 5 cm and preferably less than 3 cm to enable single-frequency operation.

The invention discloses a method for preparing Ho-Fe alloy through molten salt electrolysis, wherein a graphite crucible serves as an electrolyzer, a graphite flake serves as an anode, a pure iron rod serves as a cathode, a ferric crucible serves as a metal receiver, and holmium oxide serves as a raw material; and holmium fluoride and lithium fluoride serve as a binary system electrolyte and then are electrolyzed in a certain condition. The method comprises the following steps of: (1) drying the electrolyzer through an arching machine or a heating element oven; (2) switching on the power of the arching machine to 45kW, and continuously adding an electrolyte into the furnace continuously; (3) after the electrolyte is melted to a part which is 10cm far away from the upper edge of the electrolyzer, placing an iron crucible in the center of a furnace bottom, placing the pure iron rod above the iron crucible, and feeding a direct current to start electrolysis; (4) adding a small quantity of holmium oxide repeatedly or continuously and evenly adding holmium oxide during the electrolytic process, and intermittently adjusting the pure iron rod once intermittently; and (5) after the electrolysis is carried out for a period of time, taking out the iron crucible, pouring to obtain an ingot, and demoulding to obtain the Ho-Fe alloy after the cooling. The Ho-Fe alloy obtained by the invention is low in energy consumption, high in capacity and small in deviation, so that the Ho-Fe alloy is convenient for mass production.

The present invention belongs to the field of nano fluorescent material. Lanthanum oxide (or yttrium or gadolinium oxide), ytterbium oxide and erbiom oxide (or thulium or holmium oxide) are first dissolved in acid to prepare solution; complexone and sodium or potassium molybdenate are added into the solution to produce precipitate, which is centrifugally separated and water washed to prepare aqueous gel, aqueous gel or further prepared alcoholic gel is finally cinerated in a high temperature furnace or heated in a hydrothermal reactor to obtain the nano level up converting fluorescent material. The said material has lanthanum molybdenate as matrix and ytterbium molybdenate and erbium molybdenate as dopant. The material thus prepared has small and homogeneous size, average size 50-60 nm and high light glowing strength and may meet the requirement as biological molecular fluorescent mark material.

The invention discloses a holmium ferrite-based terahertz metamaterial, a preparation method thereof and an optical device. The preparation method of the holmium ferrite-based terahertz metamaterial comprises the following steps: (1) weighing iron oxide and holmium oxide according to a stoichiometric ratio, mixing to form a raw material mixture, and then carrying out first sintering to form a holmium ferrite-based material; and (2) molding the holmium ferrite-based material. Iron oxide and holmium oxide are used as raw materials to prepare the all-dielectric-based metamaterial with the adjustable ratio of Ho atoms to Fe atoms, the amplitude and frequency of the terahertz metamaterial can be flexibly regulated, and meanwhile the problem of large absorption loss of electromagnetic waves, caused by precious metal metamaterials used in the prior art, is solved.

The invention discloses a method for preparing holmium oxide nano materials with different morphologies, relates to a method for preparing holmium oxide nano materials, and aims at solving the problems that the existing preparation method of the holmium oxide nano material cannot adjust reactants to realize regulation and control on the morphology of the holmium oxide nanomaterial, the synthesis steps are complex and high in difficulty, the nanotube morphology and the three-dimensional structure holmium oxide nanomaterial cannot be synthesized, and the prepared holmium oxide nanosheet is relatively thick in size and has no porous structure on the surface. The method comprises the following steps: 1, dissolving holmium acetylacetonate and urea in a solvent to obtain a uniformly stirred solution; and 2, carrying out a sealed reaction on the uniformly stirred solution, naturally cooling to room temperature, carrying out centrifugal separation to obtain a faint yellow precipitate, washingthe faint yellow precipitate, drying to obtain a holmium oxide nano-material precursor, and calcining the holmium oxide nano-material precursor under an air condition to obtain the holmium oxide nano-material. The method is used for preparing holmium oxide nano materials with different morphologies.

The invention discloses vanadate upconversion material fluorescent powder, and a preparation method and application thereof. The vanadate upconversion material fluorescent powder has a chemical composition formula Y0.89-x-yVO4:0.01Tm<3+> / xEr<3+> / yHo<3+> / 0.1Yb<3+>, wherein x is 0 to 0.002, and y is 0 to 0.003. The invention also discloses the preparation method for the material, and the preparation method comprises the following steps of: weighing yttrium oxide, vanadium pentoxide, thulium oxide, holmium oxide, erbium oxide and ytterbium oxide in a molar ratio of the chemical composition formula, grinding and mixing uniformly, pre-sintering at the temperature of 650 DEG C, and keeping constant temperature of 650 DEG C for six hours; cooling, grinding again, sintering at the temperature of 1,200 DEG C, and keeping the constant temperature of 1,200 DEG C for six hours; and cooling to obtain the vanadate upconversion material fluorescent powder. The vanadate upconversion material fluorescent powder is high in luminous efficiency and stability and meets the requirement of a white light light-emitting diode (LED).

A method for preparing holmium oxide nanomaterials with different shapes, the invention relates to a method for preparing holmium oxide nanomaterials. The present invention aims to solve the problem that the existing method for preparing holmium oxide nanomaterials cannot realize the regulation and control of the morphology of holmium oxide nanomaterials through the adjustment of reactants. Holmium nanomaterials, the prepared holmium oxide nanosheets are thicker, and there is no problem of porous structure on the surface. Method: 1. Dissolve holmium acetylacetonate and urea in a solvent to obtain a uniformly stirred solution; 2. Seal the evenly stirred solution for reaction, then naturally cool to room temperature and centrifuge to obtain a light yellow precipitate, wash the light yellow precipitate After drying, the holmium oxide nanomaterial precursor is obtained, and the holmium oxide nanomaterial precursor is calcined under air conditions to obtain the holmium oxide nanomaterial. The invention is used for preparing holmium oxide nanometer materials with different shapes.

The invention discloses a method for preparing transparent magneto-optic holmium oxide ceramic. The method comprises the following steps: preparing a holmium nitrate solution and an ammonium fluoridesolution; dropwise adding ammonia water to the holmium nitrate solution, and performing aging to obtain a white precipitate; filtering and washing the white precipitate, adding the filtered and washedwhite precipitate to the ammonium fluoride solution, and performing a reaction to obtain a rare earth holmium-based layered compound precursor containing a fluorion group; sequentially washing, drying, grinding and sieving the rare earth holmium-based layered compound precursor containing the fluorion group, and then calcining the precursor to obtain holmium oxide nano-powder; and sequentially performing pre-pressing and cold isostatic press molding on the holmium oxide nano-powder, performing high-temperature pressureless sintering on the cold isostatic press molded product, and machining the high-temperature pressureless sintered product to obtain the transparent holmium oxide ceramic. The method avoids the problem of non-uniform distribution of a fluoride additive, and the prepared holmium oxide ceramic has good optical performances.

The invention provides a holmium oxide separation process, which comprises the following steps: saponifying the mixture of P507 and sulfonated kerosene to obtain organic load A, which is added to 1# extraction tank; Separation and extraction are carried out in the 2# extraction tank connected with the 1# extraction tank, and the organic load B and the organic load C are respectively drawn out; the organic load B is washed in the 3# extraction tank to obtain middle rare earth and holmium containing a small amount of yttrium after enrichment. Feed liquid; introduce it into 4# extraction tank for separation and extraction, and draw out organic load D; add it to 5# extraction tank for separation and extraction to obtain a mixture of yttrium chloride and holmium chloride; add light to 6# extraction tank Rare earth is organically loaded with E, and a mixture of yttrium chloride and holmium chloride is introduced for separation and extraction to obtain enrichments of pure holmium chloride and yttrium chloride respectively; Get holmium oxide. The holmium oxide separation process of the present application has low energy consumption, high efficiency and low cost.