17 results about "Crystal chemistry" patented technology

This invention relates to a series of alkali metal rare earth chalcogenides and a series of alkali metal rare earth chalcogenide nonlinear optical crystals, their preparation methods, and their applications. The general chemical formula for both the series of halides and the nonlinear optical crystals is A3Ln. 11 Ga 19 Q 45 X3, where A = K, Rb, Cs; Ln = La, Pr, Nd; Q = S, Se; X = Cl, Br, I, all belong to the hexagonal crystal system with space group and cell parameter Z = 1. This series of halides is synthesized using a high-temperature solid-state method, while this series of nonlinear optical crystals is grown using a high-temperature solution method or the Bridgman process. This material can be used to manufacture second harmonic generators, up- and down-frequency converters, optical parametric oscillators, etc.

The invention discloses purple light excited red oxynitride glass ceramic as well as a preparation method and application thereof, and belongs to the technical field of fluorescent glass ceramic. The crystal chemical general formula of the red-light oxynitride glass ceramic is Mg2Al4Si5 (ON) 18: Eu < 2 + >, the crystal structure belongs to a hexagonal crystal system, and the space group is P6 / mcc. According to the preparation method, the emission spectrum red shift of the Eu < 2 + > ion doped Mg2Al4Si5 (ON) 18 fluorescent material is induced through the regulation and control means of partial nitridation, the red light waveband coverage range is widened, the red light color purity is effectively improved, the preparation method of melting cooling and in-situ crystallization is adopted, the prepared material is an inorganic block material, the thermal stability and chemical stability of the material are improved, and the preparation method is suitable for industrial production. The material can be applied to the fields of white light LED devices, laser illumination display, plant illumination, optical medical treatment and the like.

The invention relates to a fluorinated biuret borate nonlinear optical crystal and a preparation method and application thereof, the chemical formula of the crystal is [C2N3O2BF2H5] [BF4], the molecular weight is 238.71, and the crystal is prepared by a hydrothermal method or a room temperature solution method; the crystal belongs to a monoclinic system, the space group is P21, and the cell parameters are as follows: a = 6.0521 (11), b = 9.4651 (18), c = 7.1398 (12), beta = 91.267 (7), Z = 2, and V = 408.90 (13) 3. The [C2N3O2BF2H5] [BF4] nonlinear optical crystal obtained by the method is used for manufacturing a second harmonic generator, an upper frequency converter, a lower frequency converter, an optical parametric oscillator and the like; meanwhile, the crystal can also be used as a birefringent crystal for manufacturing a refractive index modulator, a phase modulator and a polarization device.

This invention relates to a compound strontium borate nitrate and a strontium borate nitrate nonlinear optical crystal, as well as their preparation methods and uses. The chemical formula of the compound is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, was prepared using a vacuum-sealed tube method; the chemical formula of this crystal is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, belongs to the monoclinic crystal system and has a space group of Cc The unit cell parameters are a =11.2574(9)Å, b =6.6400(9)Å, c =18.1027(13)Å, Z=4, V=1348.9(2)Å 3 It is prepared using a high-temperature melt method or hydrothermal method under vacuum sealing conditions. Its nonlinear optical effect is approximately three times that of KDP, and its birefringence is 0.088@546 nm. This method has advantages such as simple preparation, short growth cycle, low toxicity of starting materials, and minimal harm to humans. Sr3B9O obtained by the method described in this invention... 16 (NO3) Nonlinear optical crystals have stable physicochemical properties, large nonlinear effects, and can be applied to phase-matching wavelengths in the ultraviolet band. They can be widely used in nonlinear optical devices such as frequency doubling converters and optical parametric oscillators.

The invention belongs to the field of organic-inorganic hybrid functional crystal materials, and relates to an inorganic-organic hybrid three-dimensional crystal as well as a preparation method and application thereof, raw materials containing hydroiodic acid, a protonated organic molecular cage C-D3T2 and a lead source are mixed with a solvent, and the inorganic-organic hybrid crystal is obtained through solvothermal reaction. The chemical formula of the prepared crystal is {[C-D3T2] [Pb5I14 (I3)]}. I. 6H2O; wherein the molecular formula of the C-D3T2 organic cage is H6 [C36H54N8]. The crystal is of a host-guest body structure assembled by a three-dimensional inorganic framework [(Pb5I14) I3] n5n-and a C-D3T2 molecular cage through electrostatic interaction and belongs to a monoclinic system, and the space group is C2 / c. The crystal is of a three-dimensional nested structure constructed by an organic molecular cage and inorganic lead iodide for the first time, and has certain application potential in the field of photothermal conversion.

The invention provides a cesium potassium fluoborate nonlinear optical crystal and a preparation method and application thereof, the chemical formula of the crystal is Cs4.8K5.2 B13O15F19, the molecular weight is 1582.8, the crystal belongs to a trigonal system, the space group is R3m, the cell parameters are as follows: a = 14.2606 (8), b = 14.2606 (8), c = 14.7689 (10), alpha = 90 degrees, beta = 90 degrees, gamma = 120 degrees, the unit cell volume is 2601.1 (3) 3, the number z of molecules in the cell is 3, the ultraviolet absorption edge is less than 200 nm, and the crystal has a nonlinear optical effect. And the frequency-doubled effect of the powder is about 0.17 times that of KDP (potassium dihydrogen phosphate). The crystal is grown by adopting a high-temperature solution method and a vacuum packaging method. The crystal has good chemical stability and can be used for manufacturing ultraviolet nonlinear optical devices.

The invention relates to a cobalt-based ferroelectric single-molecule magnet molecular crystal and a preparation method and application thereof, and belongs to the technical field of molecule-based magnetic materials. The chemical formula of the cobalt-based ferroelectric single-molecular magnet molecular crystal is [(CH3) 3S] 4 [Co (NCBH3) 6]. According to the invention, through the rational design of the molecular structure of an A4 [M (NCX) 6] type compound, the ordered-disordered phase change of organic cations is regulated and controlled to induce the symmetry breaking of the crystal so as to generate ferroelectricity; meanwhile, the transition metal center is endowed with strong magnetic anisotropy through ligand field engineering, so that the single-molecule magnet characteristic is realized, and the cobalt-based molecular crystal with the single-phase coexisting ferroelectricity and the single-molecule magnet characteristic is finally obtained; the problem that an existing A4 [M (NCX) 6] type compound cannot synergistically integrate ferroelectricity and the characteristics of a single-molecule magnet is solved.

This invention relates to a Cs3Bi2I9 single-crystal material with dual thermal transport behavior, its preparation method, and its applications, belonging to the field of single-crystal material technology. The preparation method includes the following steps: CsI and BiI3 are mixed and ground uniformly according to a stoichiometric ratio, then transferred to a quartz tube, vacuum-sealed, and sequentially subjected to high-temperature melting, quenching, and annealing to obtain a Cs3Bi2I9 polycrystalline ingot with a density of not less than 97%; the Cs3Bi2I9 polycrystalline ingot is placed in a sealed quartz tube, and the sealed quartz tube containing the Cs3Bi2I9 polycrystalline ingot is placed in a vertical temperature gradient furnace, first melted at high temperature, and then cooled to room temperature to obtain the Cs3Bi2I9 single-crystal material with dual thermal transport behavior. Compared with the prior art, this invention innovatively produces a Cs3Bi2I9 single-crystal material with unique dual thermal transport behavior, providing a new design concept for controlling heat transfer through crystal chemistry, and also opening up a new path for developing anisotropic thermoelectric materials with thermal management functions.

This invention relates to a compound sodium vanadium selenite and a sodium vanadium selenite optical crystal, as well as their preparation methods and uses. The compound has the chemical formula NaVSeO5 and a molecular weight of 232.89, and is prepared using a vacuum encapsulation method. The crystal has the chemical formula NaVSeO5 and a molecular weight of 232.89. The crystal belongs to the monoclinic crystal system and has a space group of [space group missing]. C 2 / c The unit cell parameters are a =18.234(3)Å, b= 3.8381(6)Å, c= 12.416(2)Å, α =90°, β =112.421(7)°, γ = 0.5 90°, V=803.2(2)Å 3 Z=8. The crystal is grown using the sealed molten salt method, the high-temperature melt method, or the vacuum tube sealing method. At a wavelength of 1064 nm, the crystal has a birefringence Δn=0.12, good chemical stability, moderate mechanical hardness, and is easy to cut, polish, process, and store. It is insoluble in water and does not deliquesce, making it suitable for fabricating optical communication components or various polarizing prisms, phase delay devices, and electro-optic modulation devices, such as Glan prisms, polarization beam splitters, compensators, optical isolators, circulators, and optical modulators. It plays an important role in the fields of optics and communications.

This invention relates to the compounds strontium lanthanum chloroborate and barium lanthanum chloroborate, as well as nonlinear optical crystals of strontium lanthanum chloroborate and barium lanthanum chloroborate, their preparation methods, and their uses. The general chemical formula for both the compounds and crystals is A3La4B3O. 13 Cl, where A = Sr, Ba, space group P63, belongs to the hexagonal crystal system, and cell parameter Z = 2. The compounds lanthanum strontium chloroborate and lanthanum barium chloroborate are synthesized by a solid-state reaction method. The nonlinear optical crystals of lanthanum strontium chloroborate and lanthanum barium chloroborate are grown using a high-temperature melt method. This material can be used to manufacture second harmonic generators, up-down frequency converters, optical parametric oscillators, etc.

The invention discloses a chemical mechanical polishing solution for CsPbBr3 crystal polishing and application, and belongs to the technical field of crystal chemical mechanical polishing. The polishing solution is composed of absolute ethyl alcohol, silicone oil, deionized water, a dispersing agent, hydrogen bromide and aluminum oxide, wherein the absolute ethyl alcohol, the silicone oil, the deionized water, the dispersing agent and the hydrogen bromide are mixed according to the volume ratio of 33: 59.2: 7: 0.6: 0.2 to form a solution I; the mass ratio of the solution I to the aluminum oxide is 10: 1. By using the polishing solution, the mechanical action and the chemical corrosion rate of the CsPbBr3 crystal in the chemical mechanical polishing process can be effectively balanced, and the damage to the crystal in the chemical mechanical polishing process is reduced; according to the polishing solution, the surface roughness, scratch density and depth generated in the CsPbBr3 crystal chemical mechanical polishing process are greatly reduced, so that the CsPbBr3 crystal chemical mechanical polishing treatment process is efficient and stable, the CsPbBr3 crystal chemical mechanical polishing quality is greatly improved, a high-quality polished surface is obtained, the physical and electrical properties of the crystal can be remarkably improved, and the quality of the CsPbBr3 crystal is improved. The practicability is high.

The invention discloses a potassium boron niobate transparent ferroelectric crystal and a growth method and application thereof. The chemical formula of the transparent ferroelectric crystal is K3Nb3B2O12, the transparent ferroelectric crystal belongs to a trigonal system, and the space group of the transparent ferroelectric crystal is P31m. The transmission range of the potassium boron niobate transparent ferroelectric crystal is 330-2500nm, the spontaneous polarization intensity is 4.0 [mu] C / cm < 2 >, the coercive field is 5.8 kV / cm, and the potassium boron niobate transparent ferroelectric crystal has wide and high optical transmission, stable physical and chemical properties and thermal properties, is not easy to deliquesce, has good mechanical properties, is easy to process, and is an excellent transparent ferroelectric crystal material.

This invention belongs to the fields of chemical drug synthesis and crystal chemistry, and relates to a crystal form of dimenhydrinate and its preparation method. Crude dimenhydrinate is mixed with an organic solvent, heated, and stirred to form a slurry, obtaining a dispersion. The dispersion is then cooled and stirred to induce crystallization. The crystallization system is subjected to solid-liquid separation, and the solid is dried to obtain crystal form B dimenhydrinate. The new crystal form of dimenhydrinate provided by this invention has the characteristics of low liquid phase related substances content, with the maximum single impurity less than 0.03% and the total impurities less than 0.05%. The preparation method provided by this invention is simple and safe to operate, requires no special equipment, and achieves a yield of over 95%.

The invention relates to a sodium magnesium zinc hydroxycarbonate ultraviolet nonlinear optical crystal and a preparation method and application thereof, the chemical formula of the crystal is Na2Mg0. 34Zn0. 66C2O7H2, the crystal belongs to a tetragonal system, the space group is P-4 (No.81), and the crystal belongs to a non-centered space group; the cell parameters are as follows: a = 7.4555 (2), b = 7.4555 (2), c = 5.7592 (3), alpha = beta = gamma = 90 degrees, Z = 2, and unit cell volume V = 320.12 (2) 3. The sodium-magnesium-zinc hydroxycarbonate ultraviolet nonlinear optical crystal provided by the invention has a broad band gap of 5.65 eV, a corresponding ultraviolet cutoff edge of 219.64 nm, a birefringence of about 0.055 at 248nm, and good phase matching capability in an ultraviolet region; the theoretical frequency multiplication coefficient of the crystal is more than two times that of a KDP crystal, and the crystal is good in mechanical property, stable in air and not prone to deliquescence. Meanwhile, the crystal is simple in preparation process, relatively low in cost and environment-friendly in raw material, has good application potential in preparation of laser harmonic generators, optical parametric amplifiers and optical waveguide devices, and can realize output of deep ultraviolet laser with the wavelength less than 400nm.

The application discloses a ganbaxin-adipic acid co-crystal and a preparation method thereof. The method comprises the following steps: step 1, dissolving ganbaxin solid in solvent I; step 2, adding adipic acid solid into the solution obtained in step 1; step 3, heating the solution obtained in step 2 and keeping the temperature, and continuously stirring; step 4, filtering the clear solution obtained in step 3, and evaporating the filtrate; and step 5, drying the crystals obtained in step 5, and obtaining the ganbaxin-adipic acid co-crystal after drying. The ganbaxin-adipic acid co-crystal has good chemical stability; the water solubility of the ganbaxin-adipic acid co-crystal is much better than that of the original crystal, and the wet stability is better than that of ganbaxin raw material crystal.

The invention relates to the field of II-VI group compound semiconductor material preparation, and discloses a preparation method of a polycompound semiconductor crystal, the polycompound semiconductor crystal is a selenium tellurium magnesium cadmium crystal, the chemical formula is Cd < 0.95 > Mg < 0.05 > Te < 1-x > Se < x >, the preparation method sequentially comprises the following steps: synthesizing a selenium tellurium magnesium cadmium polycrystal material by a high-temperature melting method, carrying out crystal growth by a vertical Bridgman method, and carrying out in-situ annealing treatment. The preparation raw materials comprise basic raw materials of Cd, Mg, Te and Se which are proportioned according to the stoichiometric ratio of Cd0. 95Mg0. 05Te1-xSex, excessive Te is added on the basis of the basic raw materials, and the In element is doped. The selenium tellurium magnesium cadmium single crystal is grown by adopting a three-temperature-zone crystal growth furnace in combination with a vertical Bridgman method, so that the temperature gradient can be accurately regulated and controlled, a smoother solid-liquid interface can be formed, the generation of defects such as dislocation, twin crystal and inclusion in the crystal is effectively reduced, meanwhile, the thermal stress in the crystal growth process is reduced, and the crystal quality is improved. The mechanical stability of the crystal is improved.

The application provides a compound zinc mercury gallium selenium and a far-infrared nonlinear optical crystal of zinc mercury gallium selenium, a preparation method and an application, the compound has a chemical formula of Zn 0.8 Hg 0.2 Ga2Se4, a molecular weight of 547.71, the crystal has a chemical formula of Zn 0.8 Hg 0.2 Ga2Se4, a molecular weight of 547.71, is a tetragonal crystal, and a space group is a non-central symmetry space group I -4, cell parameters are a=5.5627(6)Å, b=5.5627(6)Å, c=10.881(2)Å, alpha=beta=gamma=90°, Z=2, and a unit cell volume V=336.69(8)Å 3 ; a powder pure sample and a single crystal are prepared by a solid phase reaction under vacuum conditions; the pure sample XRD graph of the zinc mercury gallium selenium infrared nonlinear optical crystal in the application is consistent with a theoretical value; the crystal band gap is 2.3 eV, and the ultraviolet cutoff edge is 489 nm, which are measured by using ultraviolet-visible diffuse reflection spectroscopy; under laser irradiation at 2090 nm, the Zn 0.8 Hg 0.2 Ga2Se4 with a particle size of 0.105-0.15 microns has a frequency doubling effect which is 4 times that of commercialized silver gallium sulfide (AgGaS2).