211 results about "Cubic crystal system" patented technology

A perovskite type oxide of a single crystal structure or a uniaxial-oriented crystal structure represented by

• • ABO₃ where site A includes Pb as a main component and site B includes a plurality of elements, wherein the perovskite type oxide includes a plurality of crystal phases selected from the group consisting of tetragonal, rhombohedral, orthorhombic, cubic, pseudo-cubic and monoclinic systems and the plurality of crystal phases are oriented in the direction of <100>.

The invention discloses a mixed crystal form ferric fluoride cathode material and a preparation method thereof. The chemical formula of the mixed crystal form ferric fluoride cathode material is (FeF3)x(FeF3.0.33H2O)y/C. The cathode material has the beneficial effects as follows: the product particle size can be optimized through controlling the reaction temperature and time, the obtained product purity is high, and a ferric fluoride preparation method is novel, simple and high in yield. The prepared ferric fluoride is in a mixed crystal form of a cubic system and an orthorhombic system, the ferric fluoride of the orthorhombic system is contributed to maintaining the stability of an FeF3 structure in processes of insertion/deinsertion of lithium ion, so that the cycling performance of the material is improved, and the ferric fluoride of the cubic system is contributed to improving the mass specific capability and thermal stability of the material. The (FeF3)x(FeF3.0.33H2O)y/C material prepared by the method has the advantages of small particle size, uniform distribution, good repeatability and excellent electrochemical performance.

The invention belongs to the electroluminescent device technical field, discloses a Perovskite light emitting diode and a preparation method thereof, and aims to solve the energy waste and consumption problems caused by a high light-up voltage of an existing perovskite diode; the Perovskite electroluminescent device structure comprises the following units arranged in sequence from bottom to top: a substrate layer, an anode layer, a cavity transmission layer, a modification layer, a luminescent layer, an electron transmission layer and an cathode layer; the luminescent layer comprises a luminescent material with the perovskite structure; the perovskite structure refers to an organic/inorganic hybrid ABX3 type cubic crystal system structure, wherein A refers to an organic amine group, B refers to the fourth main group metal, and X refers to a unary halogen or a multi-halogen combination.

The invention relates to a high purity linear silicon carbide powder and a preparation method, the linear silicon carbide powder product presents light green color and has a cubic crystal system, a microstructure presents a linear state, and the content of the silicon carbide is no less than 99%. The preparation method provided by the present invention comprises the following steps: silica sol and oxidized graphene are uniformly mixed, then subjected to ultrasonic treatment, and completely stirred to obtain a composite precursor. The composite precursor is subjected to solidification, drying and grinding to obtain a powdery precursor with fine and uniform quality. Argon is introduced in the powdery precursor, a carbon thermal reduction is carried out under high temperature in a high temperature tubular furnace to obtain the carbonized silicon powder crude product; the carbonized silicon powder crude product is immersed in inorganic acid and then the pumping filtration is carried out, the unreacted carbon is removed, and cooled to obtain the silicon carbide powder with content of less than 99%. According to the invention, a silicon source is silica sol, a carbon source is oxidized grapheme, the invention has the advantages of no requirement of subsequent processing, no requirement of pressurization, addition of metal catalyst, simple process and short production period; the precursor with homogeneousness is prepared in advance, then the carbon thermal reduction is carried out, the product purity is high, and the method provided by the invention enables large-scale industrial production.

The invention relates to a rare earth oxide crystal and a preparation method thereof. The structural general formula of the crystal is (LnxRe1-x)2O3, the crystal belongs to a cubic crystal system, the space group is Ia3, and the crystal is in a bixbyite structure. The preparation method of the rare earth oxide laser crystal comprises the following steps of: firstly, manufacturing polycrystalline materials by taking Re2O3 and Ln2O3 as raw materials; then, manufacturing material bars; and filling the material bars into an optical floating zone growing furnace for growing according to a floating zone method. The method of the invention has high speed and short cycle, a crucible is not needed in crystal growth, the pollution on the crystal is reduced, and the growing crystal has high transparency and less cracks and is suitable for laser devices.

The invention discloses a photovoltaic material with a thin-layer perovskite structure and a preparation method for the photovoltaic material, belongs to the field of the photovoltaic material, and particularly belongs to the field of the photovoltaic material with the perovskite structure. An inducer is added in a synthetic process of a crystal with a perovskite structure at a proper temperature and pH value to enable the original crystal with a cubic crystal system perovskite structure to distort so as to obtain a crystal with a thin-layer stacked perovskite structure. The preparation method provided by the invention is simple in process and easy to operate; the obtained crystal with the thin-layer stacked perovskite structure is high in electron transmission efficiency; and when the photovoltaic material with the thin-layer perovskite structure is applied to a solar cell, the solar cell is high in photoelectric conversion rate; and in addition, the photovoltaic material is low in electron loss and high in transmission efficiency.

A translucent ceramic having a high linear transmittance and a high refractive index, substantially not causing double refraction, and exhibiting a high anomalous dispersion has a pyrochlore compound represented by the general formula A_xB_yO_w (wherein 1.00≦x/y≦1.10 and w represents a positive number maintaining electroneutrality) as a main component. The main component has a cubic crystal system. Preferably, the A site comprises a trivalent metallic element, and the B site comprises a tetravalent metallic element. More preferably, A is at least one of La, Y, Gd, Yb, and Lu, and B is of at least one of Ti, Sn, Zr, and Hf. The translucent ceramic is useful as a material of, for example, an objective lens used in an optical pickup.

An aerosol of a powder composed of helium carrier gas and particles of a hexagonal aluminum nitride is charged through a transfer pipe 3 into a film deposition chamber 4 whose interior is depressurized by gas evacuation using a vacuum pump 5 to maintain a degree of vacuum of 200-8000 Pa during supply of the carrier gas and the aerosol is blown from a nozzle 6 provided on the end of the transfer pipe 3 inside the film deposition chamber 4 to impinge on a substrate fastened to a substrate holder 7 to make the impact force of the particles at collision with the substrate 4 GPa or greater, thereby transforming the crystal structure of the aluminum nitride from hexagonal to cubic to deposit cubic aluminum nitride on the substrate. As a result, a method of transforming the crystal structure of a Group XIII nitride is provided that enables transformation of a Group XIII nitride to cubic crystal structure using a system of simpler configuration than that used for transforming the crystal structure of a Group XIII nitride by a static pressure application process.

The invention discloses cerium oxide polishing powder. The purity TREO of cerium oxide CeO2 is more than or equal to 99.95%; cerium oxide is CeO2 powder with crystal form being a uniphase cubic crystal system; cerium oxide is shaped like a round cake with the average particle size of 1mum. The invention further discloses a preparation method for the cerium oxide polishing powder. The preparation method comprises the steps of preparation of cerium chloride, precipitation, dehydration, roasting, smashing and the like. Compared with the existing preparation method, the polishing powder prepared by adopting the method is cerium oxide powder, F is not required for introduction in the preparation process, and the preparation method has the advantages of being simple in process, low in cost, and free from waste water; the cerium oxide polishing powder has the advantages of having no scratch in the polishing process of products, being high in polishing precision and the like.

The invention discloses a sodalite porous coordination polymer material as well as a preparation method and application thereof. The sodalite porous coordination polymer material has a chemical formula of [Zn(mtz)2-x(mim)x] infinity (0<=x<2), wherein mtz is a deprotoned 3-methyl-1,2,4-triazole anion, and mim is a deprotoned 2-methylimidazole anion. The polymer material is crystallized in a cubic system and in an I-43m space group, the length of an alpha axis is 1.70 nm, the divalent zinc ion is quadridentate, mim is bidentate, and mtz is bidentate; and a nitrogen atom is not coordinated. The sodalite porous coordination polymer material has a sodalite three-dimensional coordination network structure and a cesium chloride three-dimensional pore canal with a pore ratio of 50%, and has good thermal stability and chemical stability; and the Langmuir specific surface is greater than 1800 m<2>/g, and various gases and vapor can be absorbed effectively. The sodalite porous coordination polymer material can be used for storing, separating, catalyzing and sensing materials, performing molecular recognition and heat exchange, and the like on materials by absorbing guest molecules.

The invention discloses a non-linear optical material, namely a lead bismuth phosphate crystal, and relates to the field of non-linear optical materials. A chemical formula of lead bismuth phosphate is Pb3Bi (PO4)3; the molecular weight is 2230.98; the lead bismuth phosphate belongs to a cubic crystal system; the space group is I43d; and single-cell parameters, namely alpha, beta and gamma are 90.00 degrees, and Z is equal to 2. The lead bismuth phosphate crystal is prepared by adopting a high-temperature solid-state method. The lead bismuth phosphate has excellent non-linear optical performance; a powder secondary harmonic generation (SHG) coefficient of the lead bismuth phosphate is three times that of potassium dihydrogen phosphate (KDP); and the lead bismuth phosphate crystal can be used for deep water communication of submarines, laser blinding weapons, marine fish detection, optical disk recording, color laser printing, laser projection televisions, and optical computing or optical fiber communication.

The invention relates to a preparation method for nano active CaCO3 as special sealing material, which comprises: preparing lime milk, adding control agent for crystal system, taking carbonization reaction, activating the slurry, separating the solid from liquid to dry, smash, depolymerize, grade, screen and pack; finally, obtaining the product. Wherein, the product has 40~60nm size, cubic crystal system, and more than 25m2/g BET specific surface area. This invention is convenient to control the technical parameters, has stable quality, and can complete replace the gas-phase white carbon black and imported SiO2 to reduce cost and bring great economic benefit.

The invention relates to a method for preparing a copper selenide nano-material by using Pantoea agglomerans. The copper selenide nano-material with three different stoichiometric ratios is prepared by adjusting the amount of a chemical reducing agent NaBH4 in a solution. When a ratio of n(EDTA-Cu):n(NaBH4) in a working medium solution is not greater than 4-8:1, the product is a Cu2Se nanosphere, and belongs to a tetragonal system, the primary sediment size is 20nm, and the secondary sediment size is 50-100nm; when the ratio of n(EDTA-Cu):n(NaBH4) in a working medium solution is greater than 4-8:1, the product is a CuSe nanosphere, and belongs to a hexagonal system, and the particle size is 100-200nm; and when the solution does not contain NaBH4, the product is a Cu2-xSe nanosphere, and belongs to a cubic system, and the particle size is uniform and is about 80nm. The problems of high cost, large energy consumption and environmental pollution existing in present copper selenide preparation methods are solved in the invention.

A process for preparing the cubic crystal type FeS2 film by electric deposition, oxidizing and thermal sulfurizing includes such steps as electrically depositing Fe-S compound film on the electrically conductive glass subtrate in the aqueous solution of FeSO4 and Na2S2O3, oxidizing to obtain the precurse Fe3O4 film, and isothermal treating at 350-450 deg.C of sulfurizing temp to obtain cubic crystal type FeS2 film.

The invention provides silicate fluorescent ceramic with a full-spectrum emission effect. The chemical formula of the silicate fluorescent ceramic is shown as following: Ca3-x-y-z-mCexPryMnzNamSc2Si3O12 (I), wherein x is greater than or equal to 0.001 and less than or equal to 0.2, y is greater than or equal to 0 and less than or equal to 0.1, z is greater than or equal to 0.03 and less than or equal to 0.4, and m is greater than or equal to 0 and less than or equal to 0.3. The silicate fluorescent ceramic adopts a garnet crystal structure, belongs to a cubic crystal system, and has a space group of Ia3d. The silicate fluorescent ceramic provided by the invention is stable in physicochemical property; under the effective excitation of blue light, the emission wavelength scope of the silicate fluorescent ceramic is broad; blue-green light, yellow light, red light and deep-red light are covered in the spectrum; a low-color-temperature high-color-rendering white-light LED can be manufactured by using such single fluorescent ceramic, namely the silicate fluorescent ceramic; the problem about reabsorption caused by the mixing of multi-color fluorescent powder can be solved; the silicate fluorescent ceramic can be applied to high-power blue-light LEDs or LD pumping white-light LEDs; and the high-end display and illumination requirements can be met.

The invention relates to a solid desulfurating agent, comprising an active constitute cubic system crystalline phase Fe3O4, amorphism Fe2O3 and amorphism Fe2O3.H2O, and a paste product which is obtained from the reaction of assistant binder ferrous sulphate salt and calcium hydroxide; the invention further disclose a preparation method of the solid desulfurating agent on the basis of disclosing the constitutes of the solid desulfurating agent. The side pressure strength of the solid desulfurating agent prepared by the method in the invention can be as high as 85N/cm, and can be widely applied to the desulfurating technique of high temperature coal gasification materials.

The present invention provides an ultraviolet and stain resistant natural stone paint and a preparation method thereof. The ultraviolet and stain resistant natural stone paint comprises TiO2@Ti0.75(OH)1.5Cl1.5 nano-particles, a base material, an aggregate, an auxiliary material and deionized water. The TiO2@Ti0.75(OH)1.5Cl1.5 nano-particles are core-shell structures, cores are TiO2, shells are Ti0.75(OH)1.5Cl1.5, and an air layer is arranged between each core and the corresponding shell. Crystals of TiO2@Ti0.75(OH)1.5Cl1.5 belong to a cubic crystal system, a space group is Pn'3m, cell parameters are a=b=g=7.638(3)[Angstrom], a=b=c=90 degree, a cell volume is 445.59(2)[Angstrom]<3>, Z=8, Ti, OH and Cl form an octahedronal structure, wherein Ti is located in the center of the octahedron, and OH and Cl are distributed disorderly in the octahedron.

The invention relates to a preparation method of an anti-purple-halo transparent ceramic panel for replacing sapphires. A transparent ceramic is a cubic crystal system and comprises AlON based ceramics, Y2O3 based ceramics, Spinel based ceramics and YAG based ceramics. The preparation method of the transparent ceramic comprises the following steps: adding a certain amount of sintering additives, binding agents, dispersing agents, liquid media, grinding balls and/or rare earth oxides into ceramic powder, performing ball-milling, uniformly mixing, then performing tape casting molding, or performing slip casting molding, or performing gel casting molding, or performing injection molding, or performing dry-pressing molding to obtain a ceramic biscuit, degreasing a molded biscuit, and then sintering to obtain the ceramic; and performing annealing, polishing and anti-reflection film coating treatment on the obtained ceramic to obtain the transparent ceramic panel of which the transmittance is about 95%. The transparent ceramic panel disclosed by the invention does not need cutting processing, is easily-controllable in shape, can be used for simplifying a processing technique, also is short in ceramic production cycle, and ensures that the productivity can be improved and the cost can be reduced.