22 results about "Germanate" patented technology

The invention provides a rare earth silicon germanate scintillating material and a preparation method and application thereof, in particular to a rare earth silicon germanate scintillating material with high thermal stability and strong radiation resistance and a preparation method and application thereof, the general formula of the rare earth silicon germanate scintillating material with high thermal stability and strong radiation resistance is RE2 (1-x-delta / 2) Ce2xGedeltaSi (1-y + delta) Gey-deltaOz, in the formula, 0 lt; x is more than or equal to 0.05, y is more than or equal to 0.15 and less than or equal to 0.5, delta is more than or equal to 0 and less than or equal to 10 <-4 >, z is more than or equal to 4.95 and less than or equal to 5.05, RE represents a rare earth element, and the rare earth element is selected from at least one of lanthanum (La), lutetium (Lu), yttrium (Y) and gadolinium (Gd). The rare earth silicon germanate scintillating material provided by the invention has the characteristics of strong radiation damage resistance, high scintillation light output, low afterglow and the like while greatly improving the thermal stability, and can be used in occasions with extremely high requirements on the thermal stability or radiation resistance of the material, such as high-energy physical experiments, nuclear medicine imaging, oil exploration wells and the like.

The invention 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 of the multi-ion doped TiO2 nanosheet material. The preparation method comprises the following steps: pre-embedding a self-sacrifice template in a germanium-tungsten composite doping solution, carrying out hydrothermal conversion to construct a Ge-W synergetic optimized regular TiO2 substrate, carrying out atomic layer deposition to realize nitrogen / silver uniform doping, and carrying out synergetic surface modification on silver nitrate-ethanolamine and perfluorosilane to prepare the TiO2 nanosheet material. Germanate serves as lattice strain guidance to guide TiO2 lattice growth to form a low-defect matrix, tungstate is cooperatively doped in the matrix to construct a strong built-in electric field to improve the charge separation efficiency, Ge-W elements cooperate to stabilize a bulk phase and a grain boundary, and a gradient protection barrier is constructed with selective shielding of a fluorosilane layer. The TiO2 catalyst is synergistically improved in the aspects of high catalytic activity and long-acting environmental stability, and is suitable for efficient pollutant purification in a complex water quality environment.

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.

The application discloses a preparation method and application of a carbon cage coated porous germanium composite material, and specifically, the preparation method is as follows: magnesium germanate is heat treated in an oxygen atmosphere, then carbon coating is carried out by using acetylene decomposition, and finally, unique carbon cage coated porous germanium structure is obtained by acid pickling. The application provides a unique carbon cage and porous germanium composite structure, compared with a traditional porous germanium / carbon core-shell structure, the space provided by the pores in the porous germanium and between the carbon cage and the germanium for the volume expansion of the germanium, so that the stability of the carbon cage and the stability of the whole structure are more favorable. The carbon cage coated porous germanium composite material prepared as a negative electrode material is applied to a lithium ion battery, and the cycle stability of the lithium ion battery is significantly improved.

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 invention discloses an A-site doped modified germanate high-temperature radar stealth material and a preparation method thereof, and relates to the technical field of high-temperature electromagnetic protection preparation. The material is RE10-xSrxGe6O27-x / 2, RE is one or a combination of any more of La, Ce, Pr, Nd, Sm, Eu, Gd, Te, Dy, Ho, Er, Tm, Yb and Lu in an equal proportion, and x is smaller than or equal to 0.5. The preparation method comprises the following steps: respectively weighing proper amounts of RE2O3, SrCO3 and GeO2 powder according to the molar ratio of RE: Sr: Ge = (10-x): x: 6 (x is less than or equal to 0.5), putting the RE2O3 powder, the SrCO3 powder and the GeO2 powder into a ball milling tank, adding absolute ethyl alcohol for ball milling, uniformly mixing, drying and sieving; the sieved mixed powder is uniaxially pressed into a green body, the green body is flatly laid in an aluminum oxide ceramic boat, high-temperature calcination is conducted, and therefore the RE10-xSrxGe6O27-x / 2 material with the high-temperature radar stealth performance is prepared. The prepared RE10-xSrxGe6O27-x / 2 material with the high-temperature radar stealth performance has the high-temperature radar stealth performance such as good high-temperature stability, high dielectric loss and good radar absorption performance.

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.

The invention relates to a zirconium germanate-based orange pigment as well as a preparation method and application thereof. The pigment matrix is zirconium germanate, a doping element contains Tb, the chemical composition of the pigment is Zr < 1-x > Tb < x > GeO4, and x is equal to 0.05-0.3. The preparation method comprises a sol-gel method, a coprecipitation method or a solid-phase synthesis method. The pigment can be used as an orange pigment to be applied to the fields of plastics, coatings, enamel, ceramics or glass. The zirconium germanate-based orange pigment provided by the invention is non-toxic, good in stability and bright in color.

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 invention relates to bismuth ion doped gallium germanate blue fluorescent powder with high temperature sensitivity and a preparation method of the bismuth ion doped gallium germanate blue fluorescent powder. The chemical general formula of the bismuth ion doped gallium germanate blue fluorescent powder with high temperature sensitivity is Sr3TaGa3Ge2O14: xBi < 3 + > (0.02 < = x < = 0.10). Under excitation of 314 nm, the phosphor emits blue light, the emission broadband is 330-600 nm, and the main peak is 445 nm. The luminous intensity of the material is sharply reduced along with the rise of the temperature, the material has excellent high-temperature sensitivity, and the maximum relative sensitivity reaches 1.953% K <-1 >. The preparation method has the advantages of simplicity, safety, greenness, low cost and the like.

The invention relates to a manganese dioxide-doped calcium germanate thermistor material and a preparation method thereof, the chemical formula of the manganese dioxide-doped calcium germanate thermistor material is Ca2Ge7-xMnxO16, the thermistor material is sheet-shaped, and the two surfaces of the thermistor material are coated with platinum electrodes. The logarithm of the resistivity of the thermistor is in direct proportion to the temperature within the range of 400-1100 DEG C. The thermistor material does not depend on a complex compensation circuit to linearly output signals, a high-temperature control system is greatly simplified, the constant of the material is not reduced but is continuously increased along with the rise of the temperature, the stability of the material sensitivity is effectively maintained, and a new high-sensitivity thermistor is provided for working in a high-temperature environment (400-1100 DEG C).

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 relates to the field of research of germanium element in coal ash, in particular to a five-step selective leaching method for determining the form of germanium in coal ash, and provides a five-step selective leaching method for determining the form of germanium in coal ash by adopting various specific extraction reagents under specific operation conditions and processes according to the principle that the extraction reactivity of main germanium occurrence compounds in coal ash and different specific reagents is from weak to strong. Chemical forms mainly containing germanium elements, such as hexagonal germanium dioxide / exchange state, soluble germanate state, germanium sulfide / germanium-organic binding state, germanium-silicon binding state, tetragonal germanium dioxide / residual germanium, in the coal ash are sequentially and selectively leached. The extraction rate of the same extracting agent for the target germanium form reaches 100%, the extraction rate for germanium in other forms is lower than 10%, and the selectivity is excellent. And for various actual fly ash samples, the germanium recovery rate is stabilized between 90.8% and 100.1%. The developed step-by-step chemical extraction method special for the germanium form has the advantages that the operation steps are simple and convenient, the occurrence form of the main germanium in the coal ash can be rapidly and accurately determined at a low cost, and an important basis and a method reference can be provided for efficient extraction of the germanium in the coal.

The present application relates to a kind of europium doped germanate red fluorescent powder and preparation method, and europium doped germanate red fluorescent powder is prepared from lithium carbonate, sodium carbonate, germanium oxide and europium oxide, and the molar ratio of raw material is 1:1:8:(0.025 to 0.1), and the structural formula is LiNaGe4O9:xEu 3+ The preparation method is to add solid-phase reaction raw materials to ethanol to grind, and dry precursor mixed powder is obtained by natural air drying in air;The precursor mixed powder is placed in a tube furnace, heated to 800 DEG C at 5 DEG C / min, and calcined for 8 hours;After the product is naturally cooled to room temperature with the tube furnace, the finished product is obtained by grinding, the present application provides an asymmetric coordination environment using the flexible network structure of germanium-oxygen tetrahedron, reduces the matrix phonon energy through the strong covalence of germanium-oxygen bond, suppresses non-radiative transition and concentration quenching by combining the doping concentration within the defined interval, and improves the quantum efficiency and red light emission intensity of fluorescent powder.

The invention provides a europium ion doped borosilicate / germanate red fluorescent material and a preparation method and application thereof, the chemical formula of the europium ion doped borosilicate / germanate red fluorescent material is Ba2InBSi2O9: x% Eu < 3 + > and Ba2InBGe2O9: x% Eu < 3 + > (x = 1-15 mol), and the europium ion doped borosilicate / germanate red fluorescent material relates to the technical field of rare earth luminescent materials. The material is synthesized by adopting a high-temperature solid-phase method, raw materials are weighed according to the stoichiometric ratio of Ba: In: B: M: Eu (M = Si and Ge) = 2: (1-x): 1: 2: x, and effective substitution of Eu < 3 + > to In < 3 + > sites is realized by reasonably controlling the doping concentration and the sintering temperature. The obtained fluorescent material shows double-main-peak emission of 616nm and 707nm under excitation of 395nm ultraviolet light, respectively corresponds to transition from 5D0 to 7F2 and transition from 5D0 to 7F4 of Eu < 3 + >, and has excellent properties of high color purity, narrow-band emission and millisecond-level fluorescence lifetime. Wherein when the doping concentration of Eu < 3 + > is 9 mol%, the red light emission intensity is the strongest, and the color purities of Ba2InBSi2O9 and Ba2InBGe2O9 respectively reach 91.39% and 92.41%. Structural analysis shows that Eu < 3 + > is stably doped into a matrix in a substitution mode, and crystal structure change is not caused. The material has the advantages of simple preparation process, low cost, environment-friendly components and the like, and is suitable for the fields of illumination, display, fluorescent probes and the like.

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.

The application relates to a chromium-manganese co-doped gallium germanate zinc long-afterglow nanoparticle and a preparation method thereof. Based on low saturated vapor pressure under high-vacuum heat treatment conditions, a chromium-doped gallium germanate zinc nanoparticle mixture with manganese dioxide powder is heat treated at a lower temperature, near-infrared afterglow emission performance of the nanoparticle is improved, and nanoparticle aggregation is avoided. Meanwhile, Mn 4+ in the manganese dioxide is reduced into Mn 2+ in the nanoparticle interior in a weak reduction vacuum environment and a cation diffusion process, chromium-manganese co-doped gallium germanate zinc long-afterglow nanoparticles are obtained, the nanoparticles have near-infrared afterglow emission originating from Cr 3+ and green long-afterglow emission originating from Mn 2+ . After ultraviolet light excitation, based on energy transfer from Mn 2+ ions to Cr 3+ ions, utilization efficiency of anti-site traps far from Cr 3+ ions in the afterglow light emission process is improved, and near-infrared afterglow emission is further enhanced. The nanoparticles have an average particle size of less than 60 nm and can be used for in-vivo biological application research.