10 results about "Crystal cell" patented technology

The present invention relates to compounds and their nonlinear optical (NLO) crystals of A3B11P2O23 (A=K, Rb, Cs, NH4), their producing method and uses thereof. The series of compounds have a chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4), which are namely K3B11P2O23, Rb3B11P2O23, Cs3B11P2O23 and (NH4)3B11P2O23. The series of NLO crystals having the chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4), belong to rhombohedral crystal system, and have a space group of R3, crystal cell parameters of a=b=10.016(5)-12.591(5) Å, c=12.105(6)-14.905(6) Å, Z=3. A3B11P2O23 (A=K, Rb, Cs, NH4) compounds were prepared by a solid-state reaction method or a hydrothermal method, and A3B11P2O23 (A=K, Rb, Cs, NH4) NLO crystals were prepared by a high-temperature solid-state reaction method, a hydrothermal method, or a solution method. T They meet the requirements for the frequency conversion of UV wavelength lasers and could be used to prepare nonlinear optical devices.

The invention discloses a random mesh structure generation method for simulating a unit cell growth process. Establishing a coordinate system in a plane area of a to-be-generated random mesh, and dividing the area into regular square grids; randomly putting'seed crystals' on the grids, and establishing a growth rule of the'seed crystals'; enabling all the'seed crystals' to freely grow into'unit cells' according to a growth rule until the whole area is fully paved; according to the method, the boundary grid coordinates of the'unit cells' are extracted and fitted into the curve boundary, namely, the grid boundary on the random grid structure is obtained, and finally, the grid structure with good randomness can be obtained by utilizing the grid boundary information, so that the problems that the randomness and the controllability of an existing random grid structure are difficult to consider, and the application range is narrow are solved.

The invention discloses a binuclear copper modified molybdenum germanic acid crystalline material as well as a preparation method and application thereof. The molecular formula of the material is [Cu2 (L) 2 (HL) 4 (H2O) 2 (GeMo12O40) 2]. 3H2O; l is 1-(4-carboxyl benzyl)-[4, 4 '] bipyridine chloride; the crystal system is monoclinic; the space group is P21 / n; the cell parameters are as follows: a is equal to 18.0008 (6), b is equal to 20.8877 (6), c is equal to 20.5829 (7), alpha is equal to 90 degrees, beta is equal to 90.2370 (10) degrees, gamma is equal to 90 degrees, and Z is equal to 2. The preparation method comprises the following steps: 1, dissolving germanium oxide, ammonium molybdate, a copper salt and a ligand L in water, and regulating the pH value of the solution by using an acid regulator to obtain a reaction solution; and step 2, reacting the reaction solution in the step 1 in a high-temperature closed environment, and cooling to room temperature after the reaction is finished to obtain the binuclear copper modified molybdenum germanic acid crystalline material. According to the crystalline material synthesized by the invention, Keggin type polyacid GeMo12 and a binuclear copper site are integrated in a single framework, and electrons are directly transferred into the copper site from the polyacid through weak interaction after the polyacid obtains the electrons, so that the catalytic performance is greatly improved.

The invention discloses a three-dimensional three-layer type isotropic five-mode metamaterial, and simultaneously provides an acquisition method of the metamaterial and application of the metamaterial to low-frequency regulation and control of underwater sound waves. A unit cell structure of the metamaterial is a face-centered cubic lattice formed by intersecting 16 symmetrical three-dimensional five-mode symmetrical double cones; each symmetrical three-dimensional five-mode symmetrical double-cone is of a three-layer nested double-cone structure, each three-layer nested double-cone structure is formed by compositing double cones made of three different materials, and the three-layer nested double-cone structure sequentially comprises a first hard material layer, a soft material layer and a second hard material layer from the outer layer to the inner layer. The hard-soft-hard composite structure provided by the invention accords with the spring-mass theorem, the influence of structural parameters on the acoustic characteristics of the five-mode metamaterial can be effectively analyzed in the simulation experiment process, and the five-mode metamaterial has excellent pressure resistance under water pressure.

The application belongs to the technical field of mechanical topological insulator, and relates to a double-layer sandwich topological metamaterial plate and application thereof. The double-layer sandwich metamaterial plate is composed of a double-layer sheet and a middle sandwiched torsional-coupled resonator; the torsional-coupled resonator comprises a cylindrical mass block and a plurality of inclined rods for fixed connection. The application contains two kinds of crystal cell units, i.e. a rhombic crystal cell unit and a hexagonal crystal cell unit, wherein the rhombic crystal cell unit contains two torsional-coupled resonators, and the hexagonal crystal cell unit contains six torsional-coupled resonators. The quantum valley Hall effect is simulated by changing the size of the two resonator mass blocks of the rhombic crystal cell unit, and the topological interface state with vibration localized at the interface is realized. The quantum spin Hall effect is simulated by changing the distance from the resonator to the center of the hexagonal crystal cell unit, and the topological corner state with vibration localized at the corner point is realized. The application can realize precise manipulation and fixed-point localization effect of elastic waves, and has great application potential in vibration control and energy collection.

The application discloses a preparation method of an inorganic molecular crystal heterojunction and belongs to the field of microelectronic and optoelectronic devices, and the specific steps are as follows: I: constructing a crystal cell of an IMC and a low-dimensional semiconductor, and optimizing the crystal lattices and atom positions of the two types of crystal cells; II: performing static calculation on the two types of optimized crystal cells, and constructing a surface model according to the static calculation result; the inorganic molecular crystal heterojunction can be obtained, the performance of the gate dielectric heterojunction can be efficiently evaluated by using the F-N equation, the channel carrier state can be accurately controlled, and the performance of the low-dimensional electronic device is significantly improved, so that a brand-new research thought is provided for the development of the low-dimensional electronic device.

The invention discloses a cross calabash adjustable piezomagnetic phononic crystal plate vibration control device, which comprises piezomagnetic phononic crystal unit cells and a magnetic field control system, wherein the piezomagnetic phononic crystal unit cells are periodically arranged in an XY plane according to a square dot matrix; each piezomagnetic phononic crystal unit cell comprises a square base body with a circular through hole in the center, gourd-shaped circular rings which are located at the center of the circular through hole and are arranged in a cross shape and solid cylinders located at the four corners of the square base body, and an acceleration sensor is arranged on a vibration control area of each piezomagnetic phononic crystal unit cell; and the magnetic field control system outputs the optimal magnetic field intensity according to the vibration signal acquired by the acceleration sensor to control the vibration of the piezomagnetic phononic crystal unit cell. On the basis of light weight, the magnetic field control system is used for regulating and controlling the band gap, and intelligent control is achieved.

The application provides a numerical grid model optimization algorithm for a Voronoi modeling process of a PBX, and the numerical grid model of the PBX is a two-dimensional or three-dimensional fine numerical grid model. The algorithm eliminates the large-width-to-height-ratio cells in the two-dimensional or three-dimensional fine numerical grid model by searching the smallest cell boundary in the two-dimensional or three-dimensional fine numerical grid model, so as to optimize the numerical grid model of the PBX. The algorithm can not only realize the automatic search and determination of the smallest boundary of the crystal cell, the smallest boundary of the binder cell and the smallest boundary of the whole model cell based on the established two-dimensional or three-dimensional numerical grid model, but also realize the node merging and cell deletion based on the search result, improve the grid topology quality, increase the stability and calculation efficiency of the numerical calculation, and avoid the calculation termination caused by the distortion of the poor-quality cell.

The invention provides europium-based halogenated phosphate as well as a preparation method and application thereof. The general structural formula of the europium-based halogenated phosphate is Eu5 (PO4) 3X, wherein X is halogen. The europium-based halogenated phosphate is prepared through a simple solid-phase reaction, the high-purity europium-based halogenated phosphate can be prepared through the dosage of raw materials, a specific sintering process and secondary tabletting, the unit cell space structure can be optimized, the stability of the europium-based halogenated phosphate is further improved, and the europium-based halogenated phosphate has large magnetic entropy change. The magnetic phase transition temperature of the prepared europium-based halogenated phosphate is smaller than 1K, the maximum magnetic entropy change under the magnetic field change of 0-5T is larger than or equal to 60 J.kg <-1 >. K <-1 >, the europium-based halogenated phosphate is an extremely-low-temperature region magnetic refrigeration material with excellent performance, scientific and technological progress in the fields of low-temperature physics, deep space exploration, aerospace and the like in China can be promoted, and the europium-based halogenated phosphate can be widely applied to the fields of low-temperature physics, deep space exploration, aerospace and the like. And high value-added utilization of rare earth resources can be promoted.