11 results about "Germanate" patented technology

The invention relates to a novel second-order nonlinear optical crystal-potassium cadmium germanate (K4Cd3Ge4O13), and belongs to the field of optical crystal materials. The crystal is prepared by adopting a high-temperature solid-phase method and a high-temperature solution method, belongs to an orthorhombic crystal system and a C2 space group, is accurate in measurement of cell parameters, and shows excellent nonlinear optical characteristics and a wide light transmission range. The ultraviolet cut-off edge of the crystal is 261 nm, the infrared spectrum permeability is not obviously reduced in the range of 4000-714 cm <-1 >, the transmission range of the crystal can effectively cover a key atmosphere transmission window of 3-5 microns, and the crystal has powder frequency doubling response equivalent to that of a KDP crystal and can be applied to an all-solid-state laser as a mid-infrared nonlinear optical crystal.

This invention discloses a process for recovering germanium from germanium-silicon alloy waste, belonging to the field of germanium recovery technology. The process includes the following steps: S1. Oxidizing and roasting the germanium-silicon alloy waste to obtain roasted clinker; S2. Sulfidating and fixing the roasted clinker and pyrite to obtain activated clinker; S3. Leaching the activated clinker with sulfuric acid, followed by solid-liquid separation, and collecting the germanium-containing leachate; S4. Performing multi-stage countercurrent extraction on the germanium-containing leachate using an amine extractant to obtain a loaded organic phase; then back-extracting the loaded organic phase with an alkaline back-extraction solution to obtain a germanate solution; S5. Hydrolyzing and precipitating the germanate solution to obtain pure germanium dioxide. The roasting process of this invention fixes impurities and activates elemental germanium into soluble germanium dioxide. The purification stage efficiently separates germanium from other impurity ions, and the final hydrolysis precipitation controls product consistency. This invention's recovery process has high recovery efficiency and purity, is more environmentally friendly, and is expected to achieve large-scale production.

The application relates to the technical field of lithium ion batteries, and discloses a germanium-doped lithium-rich manganese-based positive electrode material, a preparation method thereof and a battery, steps of which are as follows: a Ni 0.25 Mn 0.75 CO3 precursor is prepared by adopting a carbonated co-precipitation method of a continuous stirring reaction kettle; the above Ni 0.25 Mn 0.75 CO3 precursor is fully ground and uniformly mixed with Li in a lithium source and a germanium source according to a certain proportion; the mixture is placed in a high-temperature calcining furnace to perform calcining under an air atmosphere, and a germanium-doped lithium-rich manganese-based positive electrode material modified by germanium ions is prepared after annealing; the germanium-doped lithium-rich positive electrode material is realized by adopting a one-step sintering method, and nanometer-scale fast-ion conductor lithium germanate coating is realized; germanium ions are introduced in a crystal lattice to induce Ni 2+ oxidation, cation order of the material is improved, the nanometer-scale fast-ion conductor lithium germanate coating can effectively isolate interface side reactions of the electrode material, lithium ion transmission is accelerated, the structural stability of the battery material is improved, and the cycle performance of the battery is improved.

The application discloses a preparation method of a gallium germanate near-infrared luminescent material, and the luminescent material has a chemical formula of Ga 3+x‑y Al 3‑ x Ge2O 13 : y Cr 3+ According to a stoichiometric ratio of each raw material in the chemical formula, each raw material is weighed, Ga is introduced through an oxide, Al is introduced through an oxide or a hydroxide, Ge is introduced through an oxide, and Cr is introduced through an oxide or a nitrate; the raw materials are fully mixed and ground to obtain a raw material powder; the raw material powder is kept at a certain temperature in an air atmosphere, is cooled to room temperature in a furnace, is ground, and the near-infrared luminescent material is prepared. The preparation method can obtain the near-infrared luminescent material which has the advantages of a spectrum peak greater than 800 nm, adjustable spectrum, high luminescent efficiency (an external quantum efficiency is greater than 30%), good thermal stability (a residual luminescent intensity at 150 o C is greater than 60% at room temperature), can be efficiently excited by a blue light chip, and the like, can be applied to biological imaging, plant illumination, night monitoring and food detection, the preparation method is simple, no waste water and waste gas are discharged, and the preparation method is suitable for large-scale industrial production.

This invention belongs to the field of inorganic luminescent materials technology, and provides a highly thermally stable blue-green germanate phosphor, its preparation method, and its applications. The chemical composition formula of this blue-green germanate phosphor is: Ba 1.98 MgGe2O7:0.01Bi 3+ The preparation method includes: (1) weighing the raw material powder separately; (2) grinding and pouring it into an alumina crucible; (3) sintering the alumina crucible containing the mixture. This phosphor uses the traditional high-temperature solid-state method to synthesize a new bismuth-doped germanate phosphor matrix in an atmospheric pressure air atmosphere. Not only is the synthesis method simple, but the prepared sample has no overlap between the excitation spectrum and the emission spectrum under the premise of wide absorption in the ultraviolet region, which can effectively avoid the phenomenon of spectral reabsorption. It can supplement the missing blue-green light region in white LEDs and match well with existing commercial 365nm near-ultraviolet LED chips. It can solve the problem that most phosphor systems cannot maintain excellent luminescence performance in high-temperature environments above 200℃.

The application discloses a rare earth ion doped magnesium calcium germanate zirconate fluorescent powder and a preparation method thereof. 3‑x MgZrGe3O 12 :xR, wherein 0.005<=x<=0.500. Ca3MgZrGe3O 12 :xR as a matrix material, and the doped R as a central light emitting ion, and R is one or a combination of several of rare earth Ce, Tb, Eu, Dy, Sm, Bi and Cr ions. The fluorescent powder is prepared by a high-temperature solid phase method. Powder diffraction data show that the sample belongs to a garnet crystal phase. The prepared fluorescent powder can be excited by violet light or blue light, and has a strong light output in a visible light region. The magnesium calcium germanate zirconate fluorescent powder is simple to manufacture, has good light stability, and can be used for a light emitting layer of a white light LED.

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 application relates to the technical field of photocatalytic materials, in particular to a multi-ion doped TiO2 nanosheet material suitable for degradation of dyes in water and a preparation method thereof. The TiO2 nanosheet material is prepared by pre-embedding a self-sacrificial template with a germanium-tungsten composite doping solution, hydrothermal conversion to construct a regular TiO2 matrix optimized by Ge-W cooperation, atomic layer deposition to realize uniform nitrogen / silver doping, and silver nitrate-ethanolamine and perfluorosilane surface modification in cooperation. Germanate acts as a crystal lattice strain guide to guide the growth of TiO2 crystal lattice to form a low-defect matrix, while tungstate builds a strong built-in electric field in the matrix through cooperative doping to improve the charge separation efficiency. The Ge-W elements cooperatively stabilize the bulk phase and grain boundary, and selectively shield the fluorosilane layer to build a gradient protection barrier, so that the TiO2 catalyst is synergistically improved in high catalytic activity and long-term environmental stability, and is suitable for efficient pollutant purification in complex water environments.

The invention discloses broadband near-infrared fluorescent powder of Al < 3 + > substituted and modified Fe < 3 + > doped germanate, a preparation method of the broadband near-infrared fluorescent powder and a near-infrared light source, and belongs to the technical field of luminescent materials. The chemical composition of the broadband near-infrared fluorescent powder is A3Ga2-yAlyGeO8: xFe < 3 + >, A is one or more of Mg, Ca, Sr and Ba, x and y represent the molar fractions of Fe < 3 + > and Al < 3 + >, the value range is that y is more than or equal to 0.1 and less than or equal to 2.0, and x is more than or equal to 0.001 and less than or equal to 0.018. According to the invention, Al < 3 + > is introduced into a Fe < 3 + >-doped germanate matrix to gradually replace Ga < 3 + >, and the doping concentration of Al < 3 + > is regulated, so that precise optimization of the luminescent property of the fluorescent powder is realized; experimental results prove that the fluorescent powder emits 700-740 nm near-infrared light under the excitation of light with the wavelength range of 200-500 nm, the quantum efficiency exceeds 90%, and the luminous intensity at the temperature of 150 DEG C is kept at 85% or above at the room temperature; the near-infrared light source device prepared from the Fe < 3 + >-doped fluorescent powder has night vision and vein imaging functions, solves the problems of low quantum efficiency and poor thermal stability of the existing Fe < 3 + >-doped fluorescent powder, and has biological safety and industrialization potential. A high-temperature solid-phase method is adopted for preparation, the process is simple, and the method is suitable for industrial production.

This invention belongs to the field of inorganic luminescent materials technology, and discloses a germanate-based long afterglow luminescent material, its preparation method, and its uses. This luminescent material uses MReGeO4 (M = Li or Na, Re = Y, Lu or Gd) as a matrix, and introduces Bi dopant ions. 3+ and Ln 3+ Obtained; and the chemical formula of the luminescent material is M 1‑x Re 1‑y GeO4:xBi 3+ ,yLn 3+ Where x is the dopant ion Bi 3+ The proportion of alkali metal ions Li in the matrix + Or Na + The molar doping concentration is given by , and 0 < x ≤ 0.010; y is the molar doping concentration of Ln. 3+ The proportion of ions (Ln = one of Eu, Tb, Pr or Yb) in the Re content of the matrix 3+ The molar doping concentration is such that 0 ≤ y ≤ 0.001. Based on trap engineering and bandgap engineering, this invention achieves the modulation of multimode fluorescence properties such as photoluminescence, afterglow, and photo / thermal excited fluorescence. In particular, it realizes dynamic information storage and encryption of multicolor multimode fluorescent printing, providing a material basis and physical prototype for next-generation fluorescent printing information storage and anti-counterfeiting technology.