49 results about "Rhombohedron" patented technology

A graphite composite material obtained by mixing graphite material 1 having diversity in the sizes of optical anisotropic structure and optical isotropic structure, the ratio thereof, and crystal direction, and graphite material 2 having a rhombohedron structure, which is different from graphite material 1 and has an average interplanar spacing d002 of plane (002) of 0.3354 nm to 0.3370 nm measured by the powder X-ray diffraction method and Lc of 100 nm or more. Also disclosed is a carbon material for a battery electrode, a paste for an electrode, an electrode, a battery, a lithium ion secondary battery and a method of producing the graphite composite material.

The present invention provides a hydrogen absorbing alloy containing as a principal phase at least one phase selected from the group consisting of a second phase having a rhombohedral crystal structure and a first phase having a crystal structure of a hexagonal system excluding a phase having a CaCu5 type structure, wherein a content of a phase having a crystal structure of AB2 type is not higher than 10% by volume including 0% by volume and the hydrogen absorbing alloy has a composition represented by general formula (1) given below: R1-a-bMgaTbNiZ-X-Y-αM1XM2YMnα  (1)

The invention belongs to the field of aerospace and aviation, and specifically relates to a rhombic octahedron that can be scaled. It is characterized in that: the first deformation surface is connected with the third deformation surface through the first corner piece and the second corner piece, The third corner piece is connected to the fourth deformation surface, connected to the fifth deformation surface through the third corner piece and the fourth corner piece, connected to the third deformation surface through the fourth corner piece and the first corner piece; the second deformation surface is passed through The seventh corner piece and the eighth corner piece are connected to the third deformation surface, connected to the fourth deformation surface through the eighth corner piece and the fifth corner piece, connected to the fifth deformation surface through the fifth corner piece and the sixth corner piece, The sixth corner piece and the seventh corner piece are connected to the third deformation surface; the first corner piece is connected to the second, third, fourth, fifth, sixth, seventh and eighth corner pieces through the fixing piece. The invention has the advantages of convenient manipulation, high scaling degree and convenient storage.

The invention provides a method for preparing a mixture of rhombohedral and rhombohedral anhydrous magnesium carbonate, which belongs to the technical field of new inorganic chemical materials, and is characterized in that the following steps are adopted: MgCl 2 ·6H 2 Add O into distilled water to prepare a transparent solution with a certain concentration, and add CH at a certain molar ratio 4 N 2 O, stir to obtain a mixed solution; heat the mixed solution to carry out a pre-synthesis reaction, the reaction temperature is 80-95°C, and the reaction time is 1-2h; NaOH is slowly added to the mixed solution of the pre-synthesis reaction, and the pH value of the mixed solution is adjusted to 11 ; The mixed solution is moved to a stainless steel reaction kettle with polytetrafluoroethylene lining for hydrothermal reaction, the temperature of the hydrothermal reaction is 140-150°C, and the reaction time is 4-6h; after the hydrothermal reaction is completed, the product is negatively Press filtration and washing to obtain anhydrous magnesium carbonate; anhydrous magnesium carbonate is composed of two crystals with different shapes; one of them is rhombohedral and the other is short columnar rhombohedral, both of which belong to the trigonal crystal system The rhombohedral anhydrous magnesium carbonate crystal has a diameter of 10-20 μm and a length of 25-50 μm; the rhombohedral anhydrous magnesium carbonate crystal has a diameter of 15-20 μm and a length of 20-25 μm.

The invention relates to a carbon-cladded KTi2(PO4)3 nano particle and a preparation method. The material can be used as a sodium ion battery anode active material, with the size of 100 to 200 nanometers; carbon uniformly covers the surface of a KTi2(PO4)3 nano particle, thus forming a carbon layer; the KTi2(PO4)3 nano particle is KTi2(PO4)3 of a rhombohedron phase; the carbon layer is 1 to 10 nanometers in thickness. The carbon-cladded KTi2(PO4)3 nano particle has the beneficial effects that the potassium titanyl phosphate nano particle with a shorter sodium ion diffusion path is obtained, and the electronic conductivity of the material is improved. The obtained carbon-cladded KTi2(PO4)3 nano particle is relatively high in sodium ion diffusion rate and relatively high in electronic conductivity; when being used as the sodium ion battery anode active material, the carbon-cladded KTi2(PO4)3 nano particle provides excellent rate capability, cycling performance at high rate and relatively high specific capacity, and is a high-rate and long-service-life application material to a sodium ion battery.

The technical problem to be solved by the present invention is to provide a structure that includes yttrium oxyfluoride and can improve plasma resistance. Specifically, it is to provide the following structure: polycrystals of yttrium oxyfluoride having a rhombohedral crystal structure as the main component, and the average crystal size in the polycrystals are less than 100 nm, characterized in that, by X-ray Diffraction The peak intensity of the rhombohedral crystal detected near the diffraction angle 2θ=13.8° is r1, the peak intensity of the rhombohedral crystal detected near the diffraction angle 2θ=36.1° is r2, and the ratio γ1 is γ1(%)=r2 When / r1×100, the ratio γ1 is 0% or more and less than 100%.