28 results about "Crystal cell" patented technology

The present invention discloses a rail transit sound barrier based on phononic crystal cells, which is divided into several cells of equal volume by dividing modules; a resonance cavity with an opening on one side is embedded in each cell; one side of the opening of the resonance cavity faces the sound source; the opening extends outward in a trumpet shape to increase the sound receiving area; several phononic crystal cells that do not contact each other are fixedly arranged in the resonance cavity; the resonance cavity in the present invention can achieve triple acoustic performance improvements, namely sound insulation, sound elimination and sound absorption: its overall appearance belongs to a Holmhelix resonance cavity, which is itself a good sound elimination device, which is the first sound elimination; the trumpet-like opening structure on the sound source side is conducive to the introduction of sound waves, and the phononic crystal cells are arranged inside, which is the second sound insulation of the device; the tail adopts a boss with the same size as the end of the trumpet mouth, which is conducive to the flow of sound waves, and a certain thickness of sound-absorbing rock wool is used on the inner wall of the tail, which is the third sound absorption.

The utility model provides an isolated photovoltaic cell electric quantity information acquisition device, which comprises eight single crystal cell panels, the outer ends of the eight single crystal cell panels are electrically connected with eight external ADC chips, the outer ends of the eight external ADC chips are connected with 16 optical couplers, the outer ends of the 16 optical couplers are provided with two single-pole analog switch chips, and the single-pole analog switch chips are electrically connected with the single crystal cell panels. Wherein the outer end of one single-pole analog switch chip is connected with a minimum MCU system module, the outer end of the other single-pole analog switch chip is connected with eight paths of rectification and voltage stabilization modules, and the outer end of the minimum MCU system module is connected with a path of USB to serial port chip. According to the invention, the problem that the working voltage of each photovoltaic cell panel is difficult to measure by using a conventional method because high voltage exists in the whole photovoltaic cell panel area in the case of normal illumination in the design of cell panel information acquisition is solved.

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 present invention discloses a lithium ion battery with high capacity, which comprises an cathode material, a anode material and an electrolyte. The cathode material has a chemical formula LiNi(1-x)MexO, wherein x is 10−6 to 10−1, and Me is a third metal other than Li and Ni. Said material has the advantages of high purity, high density and high delithiation capacity. The preparation method of the cathode material comprises: subjecting a nickel salt and an additive to chemical co-precipitation, calcining, and inducing of a crack structure with an inducing environment, an inducing chemical, or a combination thereof to give a precursor, which is mixed with Li2O, sintered and crushed to give the cathode material. Through the inducing effect of the inducing environment or the inducing chemical, the crystal structure is changed, cracks are formed, and the volume of the crystal cell is further enlarged, so that lithium ions can react with NiO more sufficiently, thereby reducing the segregation, improving the purity and density of the prelithiating material, improving the delithiation capacity, and improving the overall electric capacity of the lithium ion battery.

A solid heat-conducting freshness preservation method based on phase change cooling. The method comprises the following steps: S1, on the basis of different food products to be subjected to freshness preservation, selecting cold storage materials having different phase change temperatures, and several metal cases used for storing the phase-change cold storage materials; S2, filling each metal case with a phase-change cold storage material, and sealing the metal cases to obtain several fully-enclosed metal phase-change crystal cells (2); S3, combining the plurality of metal phase-change crystal cells (2) in various ways so as to form a covering wrapping layer, comprising natural stacking of the metal phase-change crystal cells and assembly and processing of the metal phase-change crystal cells to prepare a freshness preservation carrier, wherein the freshness preservation carrier is configured to be in one of a net shape, an annular shape and a plate shape; and S4, in a freezer or a freshness preservation transport box, a metal cold plate being selectively placed at the bottom or a side surface thereof, and the cold plate being filled with a phase-change cold storage material. One or more of the stack of metal phase-change crystal cells, a freshness preservation carrier and a metal cold plate are combined to tightly wrap food products, phase change materials of the metal phase-change crystal cells or the metal cold plate release a large amount of cold energy by means of latent heat of phase change, and the cold energy is rapidly transferred to the food products by means of the metal cases, such that the food products quickly cross a crystallization zone, and a stable low-temperature environment is also provided for food storage and transport.

The invention provides a composite film. The composite film comprises an ITO (Indium Tin Oxide) film, an SrRuO3 single crystal oxide film and an SrTiO3 single crystal oxide film, the SrRuO3 single crystal oxide thin film is arranged on the surface of the ITO thin film, an ohmic contact interface exists between the SrRuO3 single crystal oxide thin film and the ITO thin film, and the ohmic contact interface comprises a solid solution obtained by replacing Ru atoms in SrRuO3 unit cells with In atoms and a solid solution obtained by replacing In atoms in ITO with Ru atoms; the ITO thin film is arranged on the surface of the SrRuO3 single crystal oxide thin film, the SrTiO3 single crystal oxide thin film is arranged on the surface, far away from the ITO thin film, of the SrRuO3 single crystal oxide thin film, the lattice oxygen content in the SrTiO3 single crystal oxide thin film is 45-55%, and a top electrode is further arranged on the surface, far away from the SrRuO3 single crystal oxide thin film, of the SrTiO3 single crystal oxide thin film. The invention also discloses a preparation method and application of the composite film.

The application provides a single-crystal cell, a photovoltaic module and a coating method capable of inhibiting the occurrence of point pollution. The method comprises the following steps: placing a cell with an aluminum oxide coating layer in a graphite boat, and placing the graphite boat in a coating cavity of a coating device; performing a first vacuumizing process and a first temperature rising process on the coating cavity, and the pressure of the first temperature rising process is normal pressure; performing a first cleaning process on the cell with the aluminum oxide coating layer by using a first cleaning gas; and coating the cell treated by the first cleaning process. The first vacuumizing process can remove impurity gas in the coating cavity, thereby improving the purity of the coating layer formed in the coating process. The first cleaning process can remove fragments and gas particles in the coating cavity. In the temperature rising process, the gas flow is 0, and the pressure in the furnace is normal pressure, which further reduces the activity of dust and particles in the tube, which is conducive to reducing the occurrence of point pollution and improving the yield and photoelectric conversion efficiency of the cell.

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 application discloses a transition metal doped alkali base bifunctional CO2 adsorbent, a preparation method and application thereof, and comprises an alkali base bifunctional material and a transition metal. The preparation comprises the following steps: weighing transition metal, Ni, Na and Zr sources, dissolving the transition metal, Ni, Na and Zr sources in deionized water, stirring to form a uniform solution, weighing a precipitant, dissolving the precipitant in deionized water, adding the mixed system into the precipitant after complete dissolution, stirring and precipitating the mixed system in a constant-temperature water bath, drying the precipitate, calcining the obtained solid powder, and grinding the calcined solid powder into powder to obtain the transition metal doped alkali base bifunctional CO2 adsorbent. The preparation method of the transition metal doped alkali base bifunctional CO2 adsorbent material is simple, the transition metal is doped into Ni-Na2ZrO3 by using a coprecipitation method, the formation of in-situ pores and channels is promoted, the exposure area of active sites of the adsorbent is increased, the formation of lattice defects in the crystal cell is promoted, the surface energy of the crystal face of the material is changed from the dimension of solid physics, and the CO2 adsorption capacity and cycle stability are improved.

The invention discloses a conical cavity type phononic crystal vibration damping plate and an intelligent customization method thereof, and relates to the technical field of vibration suppression, the conical cavity type phononic crystal vibration damping plate comprises a rubber layer, a scatterer lead block and an epoxy resin matrix plate, the rubber layer and the scatterer lead block are connected up and down in a cavity form to form a phononic crystal cell, and the epoxy resin matrix plate is connected with the rubber layer. The photonic crystal vibration damping plate of the conical cavity is formed by periodically arranging cells. The rubber layers with the annular cavities and the scatterer vibrators are periodically arranged between the double-layer plate, the vibration reduction plate generates local resonance to absorb elastic waves, a band gap is generated, then vibration is restrained, and aiming at the low-frequency vibration reduction problem generated in mechanical equipment, the vibration reduction effect is good. The vibration suppression frequency band of a specific low-frequency band can be regulated and controlled by adjusting the structural size and the periodicity of the vibration reduction plate, and customizable intelligent regulation and control are achieved.

The present invention discloses a method for detecting crystal cells of a semiconductor crystal growth furnace in a low-resolution scenario, which relates to the technical field of semiconductor crystal growth furnaces and includes the following steps: acquiring an original image of crystal seeding through a global industrial camera in advance, calibrating the double-aperture part of the original image of crystal seeding as a target feature for cropping, and obtaining a target image containing the double-aperture part; synchronously performing hollow detection and crystal cell forming detection on the target image respectively; outputting the detection results of the hollow detection and the crystal cell forming detection, and determining whether crystal cells are generated in the current seeding stage. The present invention helps to more accurately judge the state of crystal cells, can automatically detect crystal cells, reduces the manual burden, and realizes the accuracy, efficiency and reliability of detection.

The present invention is applicable to the technical field of monocrystalline cell wafers, and provides a cleaning and texturing device for monocrystalline cell wafers, including a main body component, a conveying component installed inside the main body component, and a grabbing component connected to one side of the conveying component. An adjustment component is installed at the bottom of the grabbing component, and a bearing component is arranged at the bottom of the grabbing component and below the adjustment component. The device solves the problem that when the monocrystalline cell wafer is taken out, the velvet surface after texturing causes the water between adjacent cells to fall more slowly, and the liquid does not drip completely, and the water accumulation affects the treatment effect and subsequent drying efficiency. The device is provided with a clamping groove and a protrusion, and the vertical plate and the monocrystalline cell wafer are vibrated when the insertion rod moves, so as to accelerate the flow of water and improve the texturing and cleaning efficiency. The electric clamp works in coordination with the driving cylinder, and the interlaced separation of the cell wafers is achieved through the adjustment rod and the hinge rod, which is convenient for subsequent drying.

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 present disclosure is directed to compositions comprising at least one layer having first and second surfaces, each layer comprising: a substantially two-dimensional array of crystal cells, each crystal cell having an empirical formula of M′2M″nXn+1, such that each X is positioned within an octahedral array of M′ and M″; wherein M′ and M″ each comprise different Group 11113, WE, VB, or VIB metals; each X is C, N, or a combination thereof; n=1 or 2; and wherein the M′ atoms are substantially present as two-dimensional outer arrays of atoms within the two-dimensional array of crystal cells; the M″ atoms are substantially present as two-dimensional inner arrays of atoms within the two-dimensional array of crystal cells; and the two dimensional inner arrays of M″ atoms are sandwiched between the two-dimensional outer arrays of M′ atoms within the two-dimensional army of crystal cells.

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 invention discloses a design method of a phononic crystal periodic structure for barrier vibration isolation, which comprises the following steps of: 1, designing phononic crystal unit cell element structure characteristics aiming at target vibration source frequency domain characteristics; 2, calculating and analyzing cut-off frequency band characteristics of the phononic crystal cell elements according to the designed phononic crystal cell elements; 3, according to the designed phononic crystal cell elements, a certain structure is formed through three-dimensional stacking and combination of unit cell structures, and after steel pipe piles are installed, steel pipe-phononic crystal single piles are built in a combined mode; 4, designing a periodic structure based on the steel pipe-photonic crystal single pile by considering a pile group design theory according to the combined steel pipe-photonic crystal single pile; 5, according to the designed periodic structure, the number of rows, the number of columns and the arrangement scheme are continuously adjusted, finite element numerical calculation is carried out, the vibration isolation efficiency is calculated, and a reasonable scheme is determined.

An auto-darkening filter, comprising a liquid crystal cell assembly for controlling the shading and a liquid crystal cell assembly for adjusting the hue, wherein the liquid crystal cell assembly for controlling the shading comprises at least one positive liquid crystal cell assembly which is in a bright state when a voltage is not applied and is in a dark state when a voltage is applied; the liquid crystal cell assembly for adjusting the hue is secured to one side of the liquid crystal cell assembly for controlling the shading, the liquid crystal cell assembly for adjusting the hue comprises a polarizer proximate to the one side of the liquid crystal cell assembly for controlling the shading, an analyzer distal to the one side of the liquid crystal cell assembly for controlling the shading, and an electrically controlled birefringent liquid crystal cell which is located between the polarizer and the analyzer and capable of adjusting the hue based on a driving voltage, wherein directions of polarization axes of the polarizer and the analyzer are not parallel to each other and the electrically controlled birefringent liquid crystal cell has a liquid crystal twisted angle of greater than 90 degrees. The present application further an auto-darkening system and a welding mask comprising the auto-darkening filter which enable simultaneous control of the shading and adjustment of the hue during a welding operation.

The invention discloses a QZS three-axis ultralow-frequency vibration isolator based on a Fourier series beam. Firstly, the Fourier series beam which is more visual is put forward to serve as an integrated QZS flexible structure; secondly, proposing a joint parameter optimization model for establishing an evolutionary algorithm and a Fourier series beam finite element model; furthermore, two types of building blocks A and B are constructed based on the Fourier series beam, orthogonally stacked unit cells are formed, and the minimum-configuration QZS three-axis ultralow-frequency vibration isolator is achieved. The vibration isolator has the advantages of programmability, high integration level and miniaturization, and shows the application potential in three-dimensional vibration isolation.

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 present invention discloses an automated truss-type salt mining device, which belongs to the field of salt mining in salt fields, and includes: a crystallization pool; and also includes: a working track, which is arranged on the crystallization pool; a rotary grating part, which is arranged on the working track to slide along the working track, and the rotary grating part acts on the raw salt in the crystallization pool; a cleaning part, which is arranged on the rotary grating part and moves in coordination with the scraper to clean the scraper in real time; and a digging part, which is arranged on the working track and connected to the rotary grating part via a connecting piece, and works in coordination with the rotary grating part to dig up and transport the raw salt in the crystallization pool that has been worked by the rotary grating part. The present invention is provided with a cleaning component, which moves in coordination with the scraper when the scraper moves, so as to clean the scraper in real time.

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 present application relates to a kind of methods for preparing magnesium hydroxide slurry by light-burned active magnesium oxide hydration, and it relates to the technical field of chemical product preparation, comprising the following steps: step one, raw material preparation, according to the ratio of (0.05-1.5) : (0.1-2.5) : (80-120) : (35-45) in weight fraction, prepare thickening agent, dispersant, water and light-burned active magnesium oxide;Step two, the thickening agent and dispersant are added to water and stirred to dissolve, to obtain a dissolution solution;Step three, heating the dissolution solution;Step four, light-burned active magnesium oxide is added to the dissolution solution obtained in step three in batches, and stirring is carried out to carry out hydration reaction;Step five, after the hydration reaction is completed, continue to stir until the temperature drops to room temperature, to obtain magnesium hydroxide slurry.The present application can avoid the agglomeration of small crystal cells of magnesium hydroxide generated during hydration by adding light-burned active magnesium oxide to the dissolution solution with dispersing and thickening effect in batches to generate magnesium hydroxide, so that magnesium hydroxide slurry with high stability can be prepared.

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 present invention belongs to the field of conveying technology, and in particular to a wafer cleaning liquid feeding device and a feeding method thereof; the present invention provides a wafer cleaning liquid feeding device, comprising: a positioning plate, on which a plurality of discharge holes are opened at equal intervals; a conveying ring, and each discharge hole is evenly distributed between an inner and outer ring; a plurality of scraper blade assemblies are circumferentially arranged around the conveying ring, and each scraper blade assembly corresponds to a corresponding discharge hole, and comprises a scraper and sweeper suitable for sliding in the conveying ring; wherein the bottom of the scraper and sweeper comprises a material receiving groove, and the material receiving groove is connected with a discharge air pipe in the scraper and sweeper; the sliding of the scraper and sweeper causes particles deposited on the bottom wall of the conveying ring to enter the material receiving groove and gather toward the discharge hole, and when the scraper and sweeper moves above the discharge hole, the particles in the material receiving groove are pushed into the discharge hole; through the arrangement of the scraper blade assembly, particles in the grinding liquid are prevented from being deposited in the conveying ring, thereby improving the grinding efficiency and the utilization rate of the diamond liquid.

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 relates to a filled skutterudite crystal and a preparation method thereof, and belongs to the technical field of skutterudite materials. The chemical formula of the crystal is TexRh4Sb12, wherein x ranges from 0.1 to 1; the crystal is a cubic system, the space group is Im-3 (NO.204), the lattice constant alpha = beta = gamma = 90 degrees, and the theoretical density of the primitive cell volume of the crystal is 8.1-8.5 g / cm < 3 >. The crystal is subjected to semiconductor-insulator conversion along with temperature reduction, has sensitivity and relatively high resistivity at low temperature, is a potential energy material, and has obvious application value in the fields of thermoelectric conversion, temperature sensing and the like.

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.

The present invention relates to compounds and their nonlinear optical (NLO) crystals of A2REB3O6F2 (A=Rb, Cs, NH4; RE=Sc, Y, La), their producing method and uses thereof. The series of compounds have a chemical formula of A2REB3O6F2 (A=Rb, Cs, NH4; RE=Sc, Y, La), which are namely Rb2ScB3O6F2, Cs2ScB3O6F2, (NH4)2ScB3O6F2, Rb2YB3O6F2, Cs2YB3O6F2, (NH4)2YB3O6F2, Rb2LaB3O6F2, Cs2LaB3O6F2 and (NH4)2LaB3O6F2. The series of NLO crystals having the chemical formula of A2REB3O6F2 (A=Rb, Cs, NH4; RE=Sc, Y, La), belong to orthorhombic crystal system, and have a space group of Amm2, crystal cell parameters of a=2.7182(4)−4.9617(8)Å, b=7.7013(5)−9.9742(6)Å, c=10.2634(1)−12.904(3)Å, Z=2. A2REB3O6F2 (A=Rb, Cs, NH4; RE=Sc, Y, La) compounds were prepared by a solid-state reaction method or a hydrothermal method, and A2REB3O6F2 (A=Rb, Cs, NH4; RE=Sc, Y, La) NLO crystals were prepared by a high-temperature solution method, a hydrothermal method, or a solution method. They meet the requirements for the frequency conversion of UV wavelength lasers and could be used to prepare nonlinear optical devices.