62 results about "Crystal chemistry" patented technology

The invention discloses a series of alkali metal borate compounds and alkali metal borate crystals as well as a preparation method and application thereof, and belongs to the technical field of photoelectric functional crystal materials. The chemical general formula of the series of compounds and crystals thereof is A3RE (B3O6) 2, wherein A is K, Rb, Cs or NH4; rE = Sc and Y, the molecular weight is 355.93-744.48, the series of crystals belong to a trigonal system, the space group is P321, the cell parameters a = b = 10.5237 (13)-135237 (13), and # imgabs0 # Z = 3. The series of alkali metal borate compounds are synthesized by adopting a solid-phase reaction method or a hydrothermal method, and the series of crystals grow by adopting a high-temperature melt method or a hydrothermal method or a solution method. The series of materials can be used for manufacturing second harmonic generators, upper and lower frequency converters, optical parametric oscillators, polarizing prisms and the like.

The invention provides a preparation method and application of a compound cesium ammonium fluoborate and a cesium ammonium fluoborate nonlinear optical crystal. The chemical formula of the compound is CsNH4B8O12F2; the chemical formula of the crystal is CsNH4B8O12F2, the crystal belongs to a trigonal system, the space group is P321, and the unit cell parameters are as follows: a = b = 6.5858 (4) + / -0.02, c = 7.8163 (6) + / -0.02, alpha = beta = 90 degrees, gamma = 120 degrees and Z = 1. The crystal is grown by adopting a vacuum high-temperature solution method, a room-temperature solution method or a hydrothermal method, and the ultraviolet transmission cut-off edge of the crystal is lower than 190 nm. The nonlinear optical effect of the crystal is about 2.5 times of that of KH2PO4 (KDP), and the shortest I-type phase matching wavelength is 175.5 nm. The crystal has the advantages of simple preparation method, low toxicity of used initial raw materials, small harm to human bodies, stable physical and chemical properties, uniaxial crystal, easiness in application and the like. The method can be widely applied to nonlinear optical devices such as ultraviolet and deep ultraviolet all-solid-state lasers, optical parametric oscillators and the like.

The invention belongs to the field of nonlinear optical materials, and relates to an ultraviolet nonlinear optical crystal material and a preparation method and application thereof. The chemical formula of the ultraviolet nonlinear optical crystal material is Zn (C5H4NO) 2, C5H4NO represents 4-hydroxypyridine, and the 4-hydroxypyridine and Zn < 2 + > are combined through a coordinate bond to form a [ZnN2O2] tetrahedron; the crystal belongs to an orthorhombic system, and the space group is Fdd2. The band gap of the ultraviolet nonlinear optical crystal material is 4.40 eV, the second harmonic generation is as high as 13.6 * KDP, the birefringence delta n = 0.073 at the wavelength of 532 nm, the birefringence delta n = 0.074 at the wavelength of 1064 nm, and the ultraviolet nonlinear optical crystal material presents a photoluminescence characteristic, and has phosphorescence with the service life of 558 ms and blue afterglow visible to naked eyes and as long as 5 s under exciting light with the wavelength of 330-420 nm. In addition, the ultraviolet nonlinear optical crystal material has very strong water resistance, thermal stability and environmental stability, and has a good application prospect in the field of nonlinear optical materials.

The invention relates to a Cs3Bi2I9 single-crystal material with double heat transfer operation parameters as well as a preparation method and application thereof, and belongs to the technical field of single-crystal materials. The preparation method comprises the following steps: uniformly mixing and grinding CsI and BiI3 according to a stoichiometric ratio, transferring into a quartz tube, vacuumizing and packaging, and sequentially carrying out high-temperature melting, quenching and annealing to obtain a Cs3Bi2I9 polycrystalline cast ingot of which the density is not less than 97%; placing the Cs3Bi2I9 polycrystalline cast ingot in a sealed quartz tube, placing the sealed quartz tube in which the Cs3Bi2I9 polycrystalline cast ingot is packaged in a vertical temperature gradient furnace, melting at high temperature, and cooling to room temperature, thereby obtaining the Cs3Bi2I9 single crystal material with the double heat transfer operation mode. Compared with the prior art, the Cs3Bi2I9 single crystal material with a unique double-heat transport behavior is innovatively prepared, a new design idea is provided for regulating and controlling heat transport through a crystal chemical means, and a new path is opened up for developing an anisotropic thermoelectric material with a heat management function.

This invention belongs to the field of long afterglow luminescent materials technology, and specifically discloses an ultra-broad spectrum Cs2CdCl4:xPb 2+ Long-afterglow luminescent materials, their preparation methods and applications, including Cs₂CdCl₄:xPb 2+ Long-afterglow luminescent materials are based on Cs₂CdCl₄ and contain Pb 2+ It is a luminescent recombination center with the general chemical formula Cs₂CdCl₄:xPb 2+ Where 0.001 ≤ x ≤ 0.1. The Cs₂CdCl₄:xPb of this invention... 2+ The long-afterglow luminescent material exhibits high crystal chemical stability and can be effectively excited by 254nm ultraviolet light or X-rays, possessing a long-afterglow luminescence spectrum across an ultrawide wavelength range from UVB to visible light, with a long afterglow duration. It does not require harsh synthesis conditions involving high pressure and reduction; the synthesis can be carried out under ambient pressure using a solvothermal method and Cs₂CdCl₄:xPb. 2+ The required chemical raw materials can be used to synthesize Cs₂CdCl₄:xPb 2+ Long afterglow luminescent materials; Cs₂CdCl₄:xPb 2+ Long-afterglow luminescent materials are simple to prepare and can be mass-produced industrially; Cs₂CdCl₄:xPb 2+ Long-afterglow luminescent materials can be applied to fields such as optical anti-counterfeiting and wearable devices, and are unaffected by visible light.

The invention discloses an organic and inorganic compound crystal (H11C4N2) CdI3 as well as a preparation method and application thereof. The organic and inorganic compound crystal is a hybrid crystal, the chemical formula is (H11C4N2) CdI3, the organic and inorganic compound crystal belongs to a monoclinic system, the space group is Cc, and the cell parameters are as follows: a = 14.36-14.38, b = 7.13-7.15, c = 13.77-13.79, alpha = gamma = 90 degrees, beta = 121.2-121.4 degrees, and Z = 4. The crystal is prepared by a hydrothermal method. The organic-inorganic hybrid crystal has excellent second-order nonlinear optical performance, can output very strong 532 nm laser under 1064 nm laser irradiation, has a powder SHG coefficient 6 times that of KH2PO4 (KDP), can realize phase matching, and is a second-order nonlinear optical material with potential application value.

The invention relates to the technical field of wafer surface polishing and chemical-mechanical polishing solutions, in particular to a polishing solution for chemical-mechanical polishing of lithium niobate crystals and a preparation method of the polishing solution. The polishing solution comprises a catalyst, abrasive particles, an oxidizing agent, a surfactant, a thickening agent, a bacteriostatic agent, an acid-base regulator and deionized water; the catalyst is platinum nanoparticles, and the abrasive particles are a water-soluble silicon dioxide sol solution with the particle size of 10 nm to 150 nm. According to the invention, the platinum nanoparticles are used as the catalyst, have high specific surface area, unsaturated surface atom coordination, high active sites and excellent electron conduction, and can better catalyze the oxidation process of the lithium niobate wafer; according to the polishing solution disclosed by the invention, the chemical and mechanical actions of the polishing solution are effectively balanced by adding the platinum nanoparticles, the polishing rate of lithium niobate can be remarkably improved, and meanwhile, a polished wafer is high in flatness and free of scratches.

The application belongs to the field of nonlinear optical materials, and relates to a kind of ultraviolet nonlinear optical crystal material and its preparation method and application.The crystal chemical formula of the ultraviolet nonlinear optical crystal material is Zn (C5H4NO) 2, C5H4NO represents 4-hydroxy pyridine, 4-hydroxy pyridine is combined with Zn 2+ Form [ZnN2O2] tetrahedron by coordination bond;The crystal belongs to the orthorhombic system, and the space group is Fdd2.The band gap of the ultraviolet nonlinear optical crystal material is 4.40eV, the second harmonic generation is as high as 13.6xKDP, the birefringence Δn at 532nm wavelength is 0.073, the birefringence Δn at 1064nm wavelength is 0.074, and it shows photoluminescence characteristics, has phosphorescence with a lifetime of 558ms under the excitation light with a wavelength of 330-420nm, and blue afterglow with a naked eye visible and a duration of 5s.In addition, the ultraviolet nonlinear optical crystal material has strong water resistance, thermal stability and environmental stability, and has good application prospect in the field of nonlinear optical materials.

The invention discloses a compound rubidium antimony aluminum silicate and a preparation method and application of a rubidium antimony aluminum silicate nonlinear optical crystal, the chemical formula of the compound rubidium antimony aluminum silicate and the crystal of the compound rubidium antimony aluminum silicate is Rb5Sb4AlSi4O22, the crystal belongs to an orthorhombic system, the space group is that the cell parameter Z is 2, and the molecular weight is 1405.67. The compound rubidium antimony aluminum silicate is synthesized by adopting a high-temperature solid-phase reaction method, the rubidium antimony aluminum silicate nonlinear optical crystal grows by adopting a high-temperature solution method, the preparation method is simple, convenient and low in cost, and the obtained crystal has the advantages of wide light transmission range, stable physical and chemical properties, easiness in storage and the like, and can be used for preparing nonlinear optical devices.

The invention belongs to the technical field of long-afterglow luminescent materials, and particularly discloses an ultra-wide-spectrum Cs2CdCl4: xPb < 2 + > long-afterglow luminescent material and a preparation method and application thereof.The Cs2CdCl4: xPb < 2 + > long-afterglow luminescent material takes Cs2CdCl4 as a matrix and Pb < 2 + > as a luminescent composite center, the chemical general formula of the Cs2CdCl4: xPb < 2 + > is Cs2CdCl4: xPb < 2 + >, and x is larger than or equal to 0.001 and smaller than or equal to 0.1. The Cs2CdCl4: xPb < 2 + > long-afterglow luminescent material crystal disclosed by the invention is high in chemical stability, can be effectively excited by 254nm ultraviolet light or X rays, has a long-afterglow luminescent spectrum from UVB ultraviolet light to visible light ultra-wide wave band, and is long in afterglow luminescent time; the Cs2CdCl4: xPb < 2 + > long-afterglow luminescent material can be synthesized by adopting a solvothermal method and chemical raw materials required by the Cs2CdCl4: xPb < 2 + > under a normal pressure condition without adopting harsh synthesis conditions of high pressure and reducibility; the preparation conditions of the Cs2CdCl4: xPb < 2 + > long-afterglow luminescent material are simple, and batch industrial production can be realized; the Cs2CdCl4: xPb < 2 + > long-afterglow luminescent material can be applied to the fields of optical anti-counterfeiting, wearable equipment and the like, and is not influenced by visible light.

The present application relates to a kind of compound potassium rubidium borophosphate and a kind of preparation method and purposes of potassium rubidium borophosphate nonlinear optical crystal, the chemical formula of the compound potassium rubidium borophosphate and its crystal is K 0.9 Rb 2.1 B8PO 16 Crystal belongs to monoclinic system, space group Cc, cell parameter Z=4, molecular weight is 586.16. Compound potassium rubidium borophosphate is synthesized using high-temperature solid-phase reaction method, and potassium rubidium borophosphate nonlinear optical crystal is grown using high-temperature melt method. The preparation method is simple and low in cost. The obtained crystal has a wide light transmission range, stable physical and chemical properties, and can be used to prepare nonlinear optical devices.

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 relates to an alkali metal composite molybdate compound, an alkali metal composite molybdate nonlinear optical crystal and a preparation method and application of the alkali metal composite molybdate compound and the alkali metal composite molybdate nonlinear optical crystal, the chemical general formulas of the compound and the crystal are KAMo2O7, A is Rb or Cs, the crystal belongs to an orthorhombic system, the space group is Ama2, and the cell parameter # imgabs0 # # imgabs1 # Z is 4. The alkali metal composite molybdate compound is synthesized by adopting a solid-phase reaction method, the nonlinear optical crystal grows by adopting a high-temperature melt method or an aqueous solution method, and the nonlinear optical crystal can be used for manufacturing a second harmonic generator, an upper frequency converter, a lower frequency converter, an optical parametric oscillator and the like.

The invention belongs to the technical field of birefringent crystal material preparation, and particularly relates to a birefringent crystal and a preparation method and application thereof. The chemical formula of the crystal is Ba (SnF3) 2 (H2O), the crystal belongs to an orthorhombic crystal system, and the space group is Pnnm; the cell parameters are as follows: a = 9.9-10.0, b = 17.4-17.5, c = 4.3-4.4, and alpha = beta = gamma = 90 degrees; the birefringence of the Ba (SnF3) 2 (H2O) birefringence crystal reaches up to 0.33 (at546 nm), and the Ba (SnF3) 2 (H2O) birefringence crystal reflects remarkable optical anisotropy and is suitable for high-performance optical devices; secondly, the crystal has a broad band gap of 3.77 eV and an ultraviolet cut-off edge of 328 nm, so that the crystal can efficiently transmit ultraviolet light and is suitable for optical application of an ultraviolet band; besides, the spectrum transmission range of the crystal covers 2.5-13.3 microns, and the crystal shows excellent transmission performance from ultraviolet band to middle infrared band, meets the requirements of broadband optical devices, and has wide application potential in the optical field.

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 an alkali metal oxalofluoroborate nonlinear optical crystal, a preparation method and application thereof. The crystal has a general chemical formula of M3[B3O3F2(OH)(C2O4)][B3O3F2(OH)2], where M=K or Rb, and has molecular formulas of K3[B3O3F2(OH)(C2O4)][B3O3F2(OH)2] or Rb3[B3O3F2(OH)(C2O4)][B3O3F2(OH)2], respectively. The molecular weights are 632.31 and 493.20, respectively. The crystal is grown by a hydrothermal method or a room temperature solution method. The cutoff edge of the crystal obtained by the method is less than 200 nm. The preparation method of the crystal is simple, the physicochemical properties are stable, and the crystal can be used as a short-wavelength ultraviolet nonlinear optical crystal in an all-solid-state laser.

The present invention provides a compound, calcium guanidine nitrate, and a birefringent calcium guanidine nitrate crystal, as well as a preparation method and use thereof. The chemical formula of the compound is [C(NH2)3]2Ca(NO3)4(H2O)2, the molecular weight is 444.33, and the compound is prepared by a solvent thermal method. The crystal chemical formula is [C(NH2)3]2Ca(NO3)4(H2O)2, the molecular weight is 444.33, and the crystal belongs to the monoclinic system with a space group of C 2 / c , the unit cell parameters are a =20.319(3)Å, b =6.5717(8)Å, c =14.2195(16)Å, α =90°, β =116.399(5)°, c =90°, the unit cell volume is 1700.8(4)Å 3 , with a transmittance range of 281-1600 nm and a birefringence index between 0.152 (1064 nm) and 0.23 (281 nm). Grown using a room-temperature aqueous solution method, the resulting birefringent crystals possess moderate mechanical hardness, are easily cut, polished, and stored, and are easy to grow under simple growth conditions. They are insoluble in water, non-deliquescent, and stable in air. They exhibit a wide transmittance range and birefringence, and can be used to fabricate polarization beam splitters, phase delay devices, and electro-optical modulators.

The invention discloses an imidazolyl zinc complex crystal and application thereof as an ester hydrolysis mimic enzyme, and belongs to the technical field of metal organic complexes. According to the imidazolyl zinc complex crystal, the chemical molecular formula of the imidazolyl zinc complex crystal is [Zn (L)] (CH3CH2OH), L represents L-carnosine, and an asymmetric structural unit in the imidazolyl zinc complex crystal comprises a Zn (II), a deprotonated L-carnosine ligand and an ethanol molecule; the crystal structure of the imidazolyl zinc complex crystal is a monoclinic system P21 space group. Zinc ions and L-carnosine are coordinated to form an imidazolyl zinc complex crystal, and the imidazolyl zinc complex crystal is used as the ester hydrolysis mimic enzyme, has high catalytic activity, and can effectively solve the technical problems of relatively low catalytic efficiency and stability of the existing ester hydrolysis mimic enzyme.

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.

The invention discloses a high-resistivity strontium-doped lanthanum gallium silicate crystal and a preparation method thereof.The preparation method comprises the steps that La2O3 powder, SrCO3 powder, Ga2O3 powder and SiO2 powder are mixed according to the molar ratio of (28-30.5): (1-0.05): (50-52): (17-21), then a homogeneous raw material is obtained through wet ball milling, and a polycrystalline material block is obtained through sintering; heating the polycrystal material block until the polycrystal material block is fully melted to obtain a polycrystal melt; and completing crystal growth by adopting a melt growth method. The chemical formula of the obtained strontium-doped lanthanum gallium silicate crystal is La (3-x) SrxGa5SiO14, wherein x is more than or equal to 0.05 and less than or equal to 0.2. The strontium-doped lanthanum gallium silicate crystal provided by the invention has the advantages of good crystallinity, high resistivity, easy growth and the like, and has application prospects in the aspects of high-temperature surface acoustic wave and acoustic bulk wave piezoelectric elements.

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 present invention discloses a microcrystalline phase aggregate prepared from multi-component solid wastes, and a preparation method and application thereof. The present invention uses engineering slag, slag powder, magnesium slag, fly ash and waste glass as main raw materials, designs an artificial aggregate formula according to the chemical composition of wollastonite and anorthite crystals, and adds a nucleating agent to promote the formation and growth of microcrystals, and finally prepares a high-strength artificial aggregate with a microcrystalline glass phase as the matrix. The aggregate prepared by the present invention can utilize a large amount of various solid wastes, and at the same time has a microcrystalline structure of a specified crystal phase, which ensures the low water absorption rate and high strength of the artificial aggregate, and is simpler in preparation process and raw materials, providing a certain basis for its industrialized mass preparation.

The present invention provides a compound yttrium lead rubidium borate and a yttrium lead rubidium borate nonlinear optical crystal and a preparation method and use thereof. The chemical formula of the compound is Rb7PbY2B 15 O 30 , molecular weight is 1625.45, it is prepared by solid phase synthesis or vacuum packaging method, the crystal chemical formula is Rb7PbY2B 15 O 30 , molecular weight is 1625.45, belongs to the trigonal system, and the space group is R 32, the unit cell parameters are a =13.4642(3)Å, b =13.4642(3)Å, c =15.2917(8)Å, α =90°, β =90°, c =120°, the unit cell volume is 2400.18 Å 3 , using melt method, high temperature melt method or vacuum packaging method to grow crystals, the Rb7PbY2B obtained by this method 15 O 30 Nonlinear optical crystal, the powder frequency-doubled effect of the crystal is about 1.3 times that of KH2PO4 (KDP), the ultraviolet cutoff edge is lower than 300 nm, and the physical and chemical properties are stable. It can be used as a short-wavelength ultraviolet nonlinear optical crystal in all-solid-state lasers.

The invention relates to an azole borate crystal and a preparation method thereof, and a boron nitride material prepared by pyrolysis of an azole borate precursor. And the product with the single crystal particle size of not less than 1mm and the particle size of the single crystal aggregate of not less than 1cm can be prepared. The two crystals are named as a crystal ZB and a crystal AB respectively, the chemical formulas of the crystals are [C4H11N10] [B5O6 (OH) 4] and [C2H5N4] [C2N4H4B5O6 (OH) 4] respectively, and the crystals have definite chemical characteristics that the molecular weight of the ZB is 417.31, the ZB belongs to a monoclinic system, the space group is Ia, and the cell parameter is # imgabs0 # Z = 4; the molecular weight of AB is 387.27, AB belongs to a triclinic system, the space group is P-1, and the cell parameter is # imgabs1 # Z = 2. In view of the fact that the boric acid azole crystals can be directly pyrolyzed and converted into hexagonal boron nitride at a high temperature in an inert atmosphere and have high solubility, good melting characteristic and viscosity during solution concentration, the boric acid azole crystals are used as precursor materials, are suitable for preparing various types of hexagonal boron nitride materials, and are efficient and suitable for large-scale production.

The invention discloses blue-light microcrystalline glass capable of being excited by purple light as well as a preparation method and application of the blue-light microcrystalline glass, and belongs to the technical field of fluorescent materials. The general chemical formula of crystals in the blue-light microcrystalline glass is Li (Sr, Ba) 2Al (PO4) 3: Eu < 2 + >, the crystal structure belongs to a monoclinic system, the space group is P21 / n, the blue-light microcrystalline glass is prepared from the following material components in mole fraction: 10-60 mol% of Li2CO3, 20-50 mol% of SrCO3, 0-50 mol% of BaCO3, 5-30 mol% of Al2O3, 20-60 mol% of P2O5, 0.005-10 mol% of Eu2O3 and 5-30 mol% of B2O3, and the total mole ratio of the material components is 100 mol%. The blue-light microcrystalline glass can be applied to preparation of white-light LED devices.

The invention relates to the technical field of scintillation crystals, and discloses a rare earth ion doped fluoride scintillation crystal and a preparation method thereof, the chemical general formula of the scintillation crystal is NaLuF4: Gd / K / Xz at NaSc0. 2Lu0. 8F4, the core is NaLuF4: Gd / K / Xz, and the shell layer is NaSc < 0.2 > Lu0. 8F4; wherein X is one of Tb < 3 + >, Sm < 3 + >, Pr < 3 + > or Dy < 3 + > ions. In the process of preparing the core nanocrystals, excessive potassium sources are added, so that K < + > ions enter gaps of matrix crystal lattices to form defect state energy levels, and the energy transfer efficiency from secondary electrons to rare earth active ions is improved. According to the invention, the energy transfer efficiency of an ion excited state energy level can be improved, the scintillation performance of rare earth activated ions is enhanced together, the luminous efficiency is improved, and the non-radiative relaxation probability is reduced.

This invention relates to the field of crystal chemistry, and more particularly to a crystalline form OA1 of ellastatin oxalate, its preparation method, pharmaceutical composition, and applications. The crystalline form OA1 of ellastatin oxalate, when subjected to Cu-Kα radiation, exhibits an X-ray powder diffraction pattern including two or more 2θ values ​​selected from the group consisting of: 8.9±0.2°, 9.6±0.2°, 12.0±0.2°, 12.7±0.2°, 18.2±0.2°, 19.4±0.2°, and 24.2±0.2°. The crystalline form OA1 of ellastatin oxalate provided by this invention offers advantages in terms of stability, hygroscopicity, melting point, process scale-up feasibility, purification effect, solubility, in vitro and in vivo dissolution, bioavailability, compressibility, flowability, formulation quality, and processing performance, providing a better option for the development of drugs containing ellastatin oxalate.

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.