25 results about "Tellurate" patented technology

The invention provides a holmium and ytterbium co-doped mid-infrared microsphere Raman laser and a preparation method thereof, and relates to the technical field of laser preparation, the holmium and ytterbium co-doped mid-infrared microsphere Raman laser comprises an infrared transmission optical fiber, a pump light source, holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres, pump light emitted by the pump light source is guided to a conical region through the infrared transmission optical fiber, and the holmium and ytterbium co-doped tellurate glass microspheres and the passive tellurate glass microspheres are arranged in the conical region; sequentially carrying out optical coupling with holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres; in the holmium and ytterbium co-doped tellurate glass microspheres, the doping amount of the holmium element is 0.3%, and the doping amount of the ytterbium element is 0.45% according to the mass percentage. Compared with the prior art, through the cascade structure of the holmium-ytterbium co-doped microspheres and the passive microspheres, three-step wavelength conversion of pump light-rare earth ion lasing-Raman frequency shift is realized in a single system for the first time, and the wavelength limitation that a traditional single microsphere depends on a rare earth ion fixed energy level is broken through.

The invention discloses a dual-wavelength microsphere laser based on tri-doped rare earth ions and a preparation method thereof, the dual-wavelength microsphere laser based on tri-doped rare earth ions comprises a silica fiber, the middle part of the silica fiber is provided with a conical region; the pump light source is arranged at one end of the silica fiber; the erbium, holmium and ytterbium tri-doped tellurate glass microspheres are arranged in the conical region; pump light emitted by the pump light source is guided to the conical region through the single-mode optical fiber and is optically coupled with the erbium-holmium-ytterbium tri-doped tellurate glass microsphere; in the erbium-holmium-ytterbium triple-doped tellurate glass microspheres, infrared-transmitting tellurate glass is used as a matrix, and the doping amount of an erbium element is 0.11%, the doping amount of a holmium element is 0.22%, and the doping amount of an ytterbium element is 0.80% in percentage by mass. According to the dual-wavelength microsphere laser based on the three-doped rare earth ions, efficient and stable dual-wavelength laser output is achieved.

The invention belongs to the technical field of battery materials, and particularly relates to a modified high-nickel ternary positive electrode material and a preparation method and application thereof. The preparation method of the modified high-nickel ternary positive electrode material provided by the invention comprises the following steps: 1) mixing a lithium source, a precursor, a tellurium source and a divalent metal compound, and performing first calcination to obtain a first calcined product; (2) dissolving tellurate in an organic solvent, mixing and grinding the formed tellurate organic solvent solution and the first burning product obtained in the step (1), and then carrying out second burning to obtain a second burning product; the tellurate is selected from at least one of potassium tellurite and sodium tellurite; and (3) washing the secondary calcined product obtained in the step (2) with water, mixing with boric acid, and carrying out third calcination to obtain the modified high-nickel ternary positive electrode material. Through the specific preparation method and the synergistic effect among the steps, the obtained modified high-nickel ternary positive electrode material has good specific capacity, first effect and cycle performance.

The present invention provides a cordierite crystal-doped tellurite fluorescent glass, its preparation method, and application, belonging to the field of white light laser lighting technology. The fluorescent glass raw materials of the present invention include rare earth phosphor and precursor glass powder. The precursor glass powder raw materials include 60-70% TeO2, 10-20% ZnO, 10-20% Na2O, and 0-10% Al2O3. The rare earth phosphor, calculated as a percentage by mass of the precursor glass powder, includes 0-12% yttrium aluminum garnet phosphor and 0-5% cordierite crystal. The precursor glass powder raw materials are mixed and ground uniformly, then melted and cast to obtain the precursor glass powder. The precursor glass powder is then mixed uniformly with the yttrium aluminum garnet phosphor and cordierite crystals, melted a second time, solidified, and annealed to obtain the precursor glass powder. The tellurite fluorescent glass of the present invention exhibits efficient luminescence while retaining the ductility of traditional glass, exhibits good thermal stability, and has a simple production process.

The invention provides a lead titanium tellurate second-order nonlinear optical crystal and a preparation method and application thereof, and belongs to the technical field of optical crystal materials. The compound is prepared by a solid-phase synthesis method and a fluxing agent method, and the preparation method comprises the step of growing the titanium lead tellurate nonlinear optical crystal by adopting the fluxing agent method. The obtained product has the advantages of large frequency-doubled effect, large optical band gap, wide transmission range, stable physical and chemical properties and difficulty in deliquescence, and can be used for preparing near-intermediate infrared nonlinear optical frequency conversion devices.

The invention discloses a method for extracting tellurium from a sodium tellurite solution through electrodeposition, and belongs to the technical field of non-ferrous metal hydrometallurgy. The method comprises the following steps: dissolving crude tellurium dioxide in a sodium hydroxide solution at 60-90 DEG C to prepare a sodium tellurite electrolyte containing 200-240 g / L of tellurium and 90-110 g / L of sodium hydroxide; in the electrodeposition process, a composite additive composed of sodium ascorbate, pentasodium diethylenetriamine pentaacetate, sodium citrate and polyvinylpyrrolidone is synchronously added into the electrolyte. And carrying out electrodeposition for 14-15 days under the conditions that the current density is 40-60A / m, the voltage is 15-30V and the temperature is 15-30 DEG C. Through the synergistic effect of the composite additive, tellurite radicals in the anode region are remarkably inhibited from being oxidized into insoluble sodium tellurate, heavy metal impurity ions in the electrolyte are strongly complexed, and therefore the direct recovery rate of tellurium is increased to 90% or above while the better current efficiency is kept, and the purity of the obtained tellurium ingot reaches 99.95% or above.

The invention relates to tellurate glass for a temperature sensor and a preparation method of the tellurate glass, and belongs to the technical field of optical luminescent materials. TeO2, ZnO, ZnF2 and Gd2O3 are used as matrixes of the tellurate glass, Er2O3 and YbF3 are doped, and the preparation method comprises the following steps: grinding and heating the raw materials, annealing and polishing. The prepared tellurate glass has low phonon energy, high chemical stability, excellent thermal stability and high rare earth ion solubility. More importantly, a specific rare earth ion pair in the glass can generate two fluorescence emission peaks of which the intensity is sensitively changed along with the temperature under the pumping of a specific wavelength (such as 980nm), and high-precision temperature sensing can be realized by monitoring the fluorescence intensity ratio of the two fluorescence emission peaks. The preparation process is simple, the cost is low, and the obtained glass material has a wide application prospect in the field of non-contact optical temperature sensors.

The present invention relates to a preparation method and use of a lithium niobium telluride compound and a nonlinear optical crystal thereof, wherein the chemical formula of the lithium niobium telluride compound is LiNbTeO5. Specifically, the lithium niobium telluride compound is a polycrystalline powder or a nonlinear optical crystal, and the lithium niobium telluride nonlinear optical crystal has a wide transmission range, a strong frequency doubling effect, a high laser damage threshold, stable physical and chemical properties, is not easy to deliquesce, and is easy to cut, polish and store.

This invention discloses a rare-earth element-doped tellurate scintillation glass thin film, its preparation method, and its applications. It belongs to the field of materials science and technology, using tellurate glass as a substrate and uniformly co-doping with Eu. 3+ Ions and Yb 3+ Ions; the tellurate scintillation glass film has a thickness of approximately 80 nm to 200 nm. The tellurate scintillation glass film obtained by this invention has a uniform thickness and is defect-free, exhibiting high efficiency in Eu scintillation. 3+ →Yb 3+ Its energy down-conversion properties enable it to be used as a near-infrared luminescent or down-conversion material, and it has superior performance potential in areas such as serving as a spectral conversion layer to improve the light response of silicon-based solar cells or as a near-infrared micro scintillator.

The invention belongs to the field of chemical industry, relates to a tellurium dioxide preparation technology, and provides a 4N-grade tellurium dioxide preparation method which comprises the following steps: adding tellurium hexafluoride gas into an alkaline solution for hydrolysis reaction to obtain a tellurate suspension, and filtering and drying the tellurate suspension to obtain a tellurate crude product; adding the tellurate crude product into a concentrated hydrochloric acid solution, stirring, dissolving and filtering to obtain a tellurium tetrachloride solution; dropwise adding stronger ammonia water into the tellurium tetrachloride solution until the pH value of the solution is 4-7, and filtering, washing and drying the reaction solution for multiple times to obtain a tellurium dioxide crude product; and calcining the tellurium dioxide crude product at 500-650 DEG C to obtain tellurium dioxide with the purity of more than 99.99%. The preparation method disclosed by the invention is mild in condition and easy to industrially amplify, tellurium hexafluoride can be quickly dissolved in ammonia water, the reaction rate is high, the production efficiency is high, and 4N-grade tellurium dioxide can be prepared.

The present invention discloses a high-heat-dissipation tellurite fluorescent glass doped with micronized silica crystals, as well as its preparation method and application, relating to the field of laser lighting technology. The raw materials of the micronized silica crystal-doped tellurite fluorescent glass include: yttrium aluminum garnet yellow phosphor, micronized silica crystals, and precursor glass powder. The precursor glass powder comprises, by mole percentage, 59-70% TeO2, 10-20% ZnO, 10-20% Na2O, and 1-10% Al2O3. The mass of the yttrium aluminum garnet yellow phosphor accounts for 1-15% of the mass of the precursor glass powder, and the mass of the micronized silica crystals accounts for 10-25% of the mass of the precursor glass powder. The fluorescent glass of the present invention has high luminescence performance, excellent thermal stability, and a high laser irradiation threshold, meeting the high-performance requirements of white-light laser lighting. It also has the significant advantages of a simple preparation process, environmental friendliness, and low production cost.

The invention relates to a method for producing a crystalline tellurate comprising at least zinc; the method comprising the following steps: providing a cationic aqueous solution comprising Zn2+ and Te6+ cations; co-precipitating the crystalline tellurate in liquid medium by applying a pH to the cationic aqueous solution, the pH being maintained at a value ranging from 5.00 to 10.00; and optionally separating the crystalline tellurate from the liquid medium.

The invention relates to a preparation method of an erbium-ion-doped mid-infrared microsphere laser. The preparation method comprises the following steps: step 1, preparing erbium-ion-doped low-hydroxyl fluorotellurite glass; wherein the lowest absorption coefficient of hydroxyl is 0.009 cm <-1 >; step 2, preparing the low-hydroxyl fluorotellurite glass into powder, and then sequentially melting and cooling the powder to prepare erbium ion doped fluorotellurite glass microspheres; step 3, preparing the fluorotellurite optical fiber into an optical fiber taper with a taper area by utilizing an arc discharge assisted local heating stretching method; and step 4, placing the fluorotellurite glass microspheres in a taper area of an optical fiber taper, and exciting erbium ions in the fluorotellurite glass microspheres through an optical fiber taper coupling method under 976nm laser pumping to realize 2.7 [mu] m laser emission. The invention has the advantages that 2.7 mu m laser output can be realized, and the coupling efficiency is high.

The invention belongs to the technical field of tellurium recovery, and discloses a method for recovering tellurium dioxide from tellurium electrolysis anode slime, which comprises the following steps: step 1, carrying out acid dissolution treatment on the tellurium electrolysis anode slime to completely dissolve sodium tellurate to obtain a solution A; step 2, adding alkali liquor into the solution A to enable the pH value of the system to be 1.5-2.5, completely reacting to obtain a solution B, and continuously stirring in the process; 3, sodium sulfite is added into the solution B, the system potential is controlled to range from-50 mV to-80 mV, solid-liquid separation is conducted after the reaction is completed, and tellurium dioxide is obtained. According to the method for recovering the tellurium dioxide from the tellurium electrolysis anode slime, the tellurium element in the tellurium electrolysis anode slime is dissolved through the acid liquor, then the pH value of the system is adjusted to a specific range through the alkali liquor, then the sodium sulfite is added for reacting to obtain the tellurium dioxide, and the method has the advantages of being high in tellurium recovery rate and good in safety.

The invention belongs to the field of fluorescent optical fiber sensors, and particularly relates to a preparation and use method of a portable down-conversion tellurate optical fiber temperature sensor. At present, most (doped) tellurate optical fibers based on the fluorescence intensity ratio technology are upconversion materials and are difficult to couple with multimode optical fibers, the sensitivity needs to be improved when the (doped) tellurate optical fibers serve as temperature sensors, and laser exciters large in weight and size are needed. Aiming at the problems in the prior art, TeO2, ZnO, Bi2O3 and Er2O3 are adopted to prepare the down-conversion rare earth doped tellurate optical fiber, and the coupling performance is good when the down-conversion rare earth doped tellurate optical fiber is welded with a multimode optical fiber; the prepared temperature sensor is high in sensitivity and good in stability; and an ultraviolet lamp is adopted for pumping, so that temperature monitoring is facilitated.

The present invention discloses a method for preparing a high rare earth doped large melting amount tellurite glass. The preparation method adopts a traditional high temperature melting process, and adds a multi-step stepped heating and sintering process between the two steps of physical or chemical reaction water removal and high temperature melting, that is, in the temperature range between the softening temperature and the melting temperature of the glass, a plurality of specific temperature values ​​are set, and different heat preservation times are set at each specific temperature value. As the amount of glass melting increases, the more specific temperature values ​​are set, the longer the sintering time. This invention solves the problem that as the melting amount of tellurite glass increases, the quality of the glass melt deteriorates in the subsequent high temperature melting stage due to no sintering or insufficient sintering temperature and time. It not only greatly improves the glass quality, but also increases the solubility of rare earth ions in the glass. It can prepare high rare earth doped large melting amount high quality tellurite glass, and provides possibilities for the processing and application of various large-sized tellurite glasses.

This invention discloses a method for improving the Raman gain coefficient of tellurate glass. By introducing Ga2O3 into a TeO2-BaF2-Y2O3 tellurate glass matrix, Ga ions enter the glass network and form [GaO4] tetrahedral structural units. These Ga ions then form a Te-O-Ga connection structure with the tellurium oxygen structural units through bridging oxygen bonds, thereby controlling the glass network structure and increasing the proportion of non-bridging oxygen. Raman spectroscopy results show that at 789 cm⁻¹... ‑1 The Te-O-Te vibration peak is enhanced at 480 cm⁻¹. ‑1 Vibrational characteristic peaks associated with the Te-O-Ga structure appear at a certain point. A peak intensity ratio evaluation function is constructed to quantitatively evaluate the glass structure, thereby obtaining tellurate glass materials with high Raman gain coefficients. Through structural tuning, the synergistic enhancement of the two main Raman vibrational modes can be achieved, thus significantly improving the Raman gain coefficient of tellurate glass.

The invention belongs to the field of X-ray detection, and particularly relates to application of a tellurate-based glass material in X-ray detection. An X-ray detector adopted for X-ray detection is of a semiconductor detector structure and comprises a detection dielectric layer, a positive electrode and a negative electrode, the positive electrode and the negative electrode are arranged on the two opposite sides of the detection dielectric layer, and the detection dielectric layer is made of the tellurate-based glass material. The tellurate-based glass material is a glass material in which the molar percentage content of TeO2 is not less than 25%. The glass material is directly used for preparing an X-ray detector of a semiconductor detector structure, X-ray imaging can be achieved, imaging is clear, and the glass material has the advantages of being simple in preparation process, low in cost, safe, environmentally friendly and the like.

The invention provides two tellurate compounds and nonlinear optical crystals and a preparation method and application of the tellurate compounds and the nonlinear optical crystals, Te < 4 + > ions, d0 transition metal cations Mo < 6 + > / W < 6 + > and alkaline earth metal cations Ca < 2 + > are combined, two novel tellurate nonlinear optical crystals Ca7MTe6O22 are obtained, and M is Mo or W. The crystal has a unique quasi-zero-dimensional structure and is composed of an isolated [TeO3] group and a [MO4] tetrahedral group. The Ca7MTe6O22 shows excellent comprehensive properties, including a short ultraviolet cut-off edge (less than 270nm), a large optical band gap (gt; 4.0 eV), a strong powder frequency-doubled effect (gt; 5 * KDP), a moderate birefringence value, and excellent thermal stability (gt; 1000 DEG C), and a wide infrared transmission cutoff edge (gt; 5.0 [mu] m). Therefore, the two crystals can be used as nonlinear optical crystals, are used for preparing multi-band frequency doubling devices or optical elements, are used for manufacturing second harmonic generators, upper and lower frequency converters and optical parametric oscillators, and have potential application value.

The present invention discloses a mid-infrared 4.5 μm band all-fiber laser, which includes a first laser pump source, a second laser pump source, a fluoro-tellurite soft glass fiber, a pump combiner, a rare-earth ion doped fiber, a first fiber Bragg grating pair and a second fiber Bragg grating pair. The first laser pump source provides a first pump laser. The seed laser output by the second laser pump source generates a second pump laser after experiencing the first-order Raman frequency shift effect of the fluoro-tellurite soft glass fiber. The two pump lasers are coupled to the rare-earth ion doped fiber through the pump combiner. The rare-earth ion doped fiber generates mid-infrared laser in the 4.5 μm band under the cascaded pumping action of the first pump light and the second pump light. Based on the all-fiber structure, the present invention realizes the high-efficiency output of mid-infrared 4.5 μm band laser by using the dual-wavelength cascaded pumping method.

The invention provides a magnesium-aluminum-based double hydroxide efficient adsorption material constructed between doped ions and a preparation method and application of the magnesium-aluminum-based double hydroxide efficient adsorption material, and relates to the technical field of wastewater treatment. The doped ions comprise La < 3 + > or Fe < 3 + >. According to the invention, the shape memory function of the roasted material is utilized, in the dynamic recovery process of the structure, doped ions are accurately constructed in the interlayer domain of the re-formed LDH in the form of high-activity hydroxyl complexation anions, so that the performance of the LDH is improved. Therefore, the pollutants such as tellurate, tellurite or polonium can be directly and fully contacted with specific active sites exposed in the interlayer channel, and efficient capture is realized through strong ion exchange and inner layer complexation, so that the adsorption capacity is remarkably improved.

The present application belongs to the technical field of battery materials, and specifically relates to a modified high-nickel ternary positive electrode material, and a preparation method therefor and the use thereof. The preparation method for a modified high-nickel ternary positive electrode material provided by the present application comprises the following steps: 1) mixing a lithium source, a precursor, a tellurium source and a divalent metal compound, and subjecting same to first calcination, so as to obtain a first calcined product; (2) dissolving a tellurate in an organic solvent, mixing and grinding the resulting tellurate organic solvent solution and the first calcined product obtained in step (1), and then subjecting same to second calcination to obtain a second calcined product, wherein the tellurate is selected from at least one of potassium tellurite and sodium tellurite; and (3) washing the second calcined product obtained in step (2) with water, mixing same with boric acid, and subjecting the mixture to third calcination, so as to obtain the modified high-nickel ternary positive electrode material. Through the specific preparation method and the synergistic effect among the steps in the present application, the resulting modified high-nickel ternary positive electrode material has a good specific capacity, initial Coulombic efficiency and cycling performance.

The invention discloses a compound rubidium scandium tellurate second-order nonlinear optical crystal as well as a preparation method and application thereof, and belongs to the technical field of optical crystal materials. The method comprises the following steps: mixing a scandium-containing compound, a rubidium-containing compound and a tellurium-containing compound, preparing the compound rubidium scandium tellurate by adopting a solid-phase reaction method, and heating and melting the obtained compound rubidium scandium tellurate single-phase polycrystalline powder or a mixture of the obtained compound rubidium scandium tellurate single-phase polycrystalline powder and a fluxing agent to obtain uniform mixed melt; or directly heating and melting a mixture of the scandium-containing compound, the rubidium-containing compound and the tellurium-containing compound or a mixture of the scandium-containing compound, the rubidium-containing compound, the tellurium-containing compound and the fluxing agent to obtain uniform mixed melt, and performing crystal growth to obtain the scandium-containing rubidium-tellurium-containing crystal. The crystal has stable physical and chemical properties, has potential application value, can be applied to nonlinear optical devices, such as laser frequency multipliers, can generate laser output different from incident light frequency, and provides new material selection and technical support for development of laser technology.

The invention provides thulium-doped tellurate glass as well as a preparation method and application thereof, and belongs to the technical field of luminescent glass. In the thulium-doped tellurate glass provided by the invention, boron can form topological units of [BO3] and [BO4], so that the density and refractive index of the tellurate glass and the complexity of a rare earth ion coordination environment are improved; bismuth utilizes the special electronic structure and the low-valence luminescence characteristic of bismuth to promote the laser glass to emit light at the nearly 1.8 mu m wave band; zinc ions are combined with free oxygen to form [ZnO4] and [ZnO6], and then participate in the formation of a glass network, so that the density of the glass is further improved, and the formation of zinc-oxygen tetrahedrons and zinc-oxygen hexahedrons enables network bond angles to be twisted, opened and closed, so that more coordination environments are provided for rare earth ions, and the luminous intensity of the rare earth ions is improved; by controlling the doping amount of thulium, the luminescent characteristic of thulium ions can be fully played, so that the glass has higher fluorescence intensity.

The application discloses a trivalent chromium passivation agent for galvanized zinc which can replace hexavalent chromium color passivation, and a preparation method thereof. The trivalent chromium passivation agent comprises the following components in parts by weight: 80-120 parts of trivalent chromium salt; 10-20 parts of other metal salt; 5-10 parts of color adjusting agent; 30-40 parts of oxidizing agent; 10-20 parts of film forming promoter; 10-20 parts of complexing agent; 1-5 parts of wetting agent; 1-5 parts of inhibitor; and a certain amount of deionized water. The color adjusting agent obtained by compounding dimethyl selenium, strontium oxalate and titanium tellurate is added in the trivalent chromium passivation agent for galvanized zinc, and selenium, strontium, tellurium, titanium and other substances in the color adjusting agent are filled in the skeleton of the passivation film, so that the absorption, reflection and diffuse reflection of the passivation film to incident light are changed, thereby achieving the purpose of adjusting the color of the passivation film. The galvanized zinc part treated by the trivalent chromium passivation agent has a bright passivation film color which is almost consistent with that of the hexavalent chromium color passivation.