5 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.

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.

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.

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 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).