60 results about "Niobium pentoxide" patented technology

The invention discloses a method for preparing 6N and above high-purity Nb2O5 by using a niobium oxalate precursor, belongs to the technical field of niobium pentoxide preparation, and solves the problems of low purity and high impurity content of Nb2O5 prepared by the existing method. The method comprises the following steps: mixing niobium oxalate with high-purity water to obtain a mixed solution; performing cold crystallization purification; separating niobium oxalate crystals from the mother liquor, washing and drying; the method comprises the following steps: putting niobium oxalate crystals into a crucible, putting the crucible into a vacuum reaction distillation furnace, sealing a system, vacuumizing to below 1Pa, carrying out inert gas replacement, and then carrying out stage heating and heat preservation; cooling to 800-900 DEG C, introducing high-purity oxygen into the system, and carrying out oxidation stabilization treatment at a constant temperature; after treatment, continuously cooling to 200 DEG C or below, and then naturally cooling to room temperature to obtain a high-purity Nb2O5 product. The Nb2O5 product prepared by the method disclosed by the invention is high in purity and low in impurity content.

The invention discloses a preparation method of high-purity Nb2O5, belongs to the field of preparation of Nb2O5, and solves the problem of low purity of Nb2O5 prepared by the existing method. The preparation method comprises the steps that a metal niobium ingot with the purity larger than or equal to 99.999% is adopted, and vacuum drying is conducted after surface peeling, dilute nitric acid ultrasonic cleaning and high-purity water flushing are conducted; the pretreated niobium ingot is subjected to a hydrogenation reaction in a pure hydrogen atmosphere, niobium hydride is generated and then crushed, and niobium hydride powder is obtained; carrying out dehydrogenation treatment on the niobium hydride powder under a high vacuum condition; dissolving the metal niobium powder with electronic-grade hydrofluoric acid, and filtering to obtain fluorine niobic acid filtrate; performing multi-stage counter-current extraction and reverse extraction on the fluobiobic acid filtrate by adopting an extracting agent to obtain fluobiobic acid reverse extraction liquid; introducing high-purity ammonia gas into the fluobiobic acid strip liquor, and precipitating to generate niobium hydroxide; ageing, filtering and washing with high-purity water for multiple times to obtain a niobium hydroxide filter cake; and calcining the niobium hydroxide filter cake in a high-purity oxygen atmosphere in stages to obtain niobium pentoxide. The niobium pentoxide prepared by the method disclosed by the invention is high in purity.

The invention provides a preparation method of ultra-pure niobium pentoxide, which is stable in process and high in efficiency, and aims to reduce the silicon content to be less than 3ppm and obtain ultra-pure niobium pentoxide through the synergistic effect of directional dissolution silicon removal and precision filtration and washing impurity removal.

This invention discloses a method for preparing interface-reinforced niobium pentoxide / porous graphene and its energy storage application. The method involves adding porous graphene oxide during the solvothermal synthesis of a niobium pentoxide precursor to obtain a composite precursor of niobium pentoxide and porous graphene oxide. This precursor is then annealed under a protective atmosphere to obtain the interface-reinforced niobium pentoxide / porous graphene composite material. The composite material obtained by this invention exhibits excellent performance as an electrochemical energy storage material. Furthermore, the preparation method of this invention is simple to operate, requires no complex equipment, and is easily controlled, making it suitable for mass production.

The invention belongs to the technical field of lithium ion battery materials and electrochemistry, and discloses high-entropy doped niobium pentoxide nanoparticles as well as a preparation method and application thereof. The chemical formula of the nano-particles is Nb < 1-x > FeaCoeNiiCrjAlkO2, x = a + e + i + j + k, and x is larger than or equal to 0.04 and smaller than or equal to 0.06, 0 lt; a < lt >; 1, 0lt; lt, lt; 1, 0lt; ilt; 1, 0lt; jlt; 1, 0lt; klt; 1; the material has an orthorhombic system and a space group P2 / m, doped metal occupies Nb sites in an atomic-scale dispersion manner, and a unit cell parameter c axis is expanded to 0.41 nm; and the size of the nano particles is 50 to 200 nm. According to the preparation method, a hydrothermal method is combined with high-temperature sintering, niobium pentachloride is used as a niobium source, specific metal salt is used as a doping source, terephthalic acid is used as a ligand, and the material is prepared through the steps of solution preparation, hydrothermal reaction, drying and sintering. The nano-particles are high in electron conductivity and fast in lithium ion diffusion, the capacity reaches 156 mAh. G <-1 > under the rate of 100 C, the capacity retention rate is 88% or above after 1000 times of circulation under the rate of 10 C, and the nano-particles can be used as an excellent lithium ion battery negative electrode material and are suitable for the field of high-power lithium ion batteries.

The invention provides a multi-modified lithium-rich manganese-based positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a lithium-rich manganese-based precursor, a lithium source, lithium fluoride, niobium pentoxide and a fluxing agent to obtain a mixed material, and carrying out first sintering treatment on the mixed material to obtain a first sintered material; mixing the primary sintering material with a carbon source, and performing secondary sintering treatment to obtain a secondary sintering material; and mixing the secondary sintering material with lithium metaphosphate, and carrying out third sintering treatment to obtain the multi-modified lithium-rich manganese-based positive electrode material. The lithium-rich manganese-based positive electrode material is subjected to multiple modification, so that the problem of structural stability of a material body is solved, the interface effect is improved, surface passivation can be realized, and no extra resistance is generated for ion and electron transmission.

The application discloses a preparation method of a sheet-shaped Nb element doped modified bismuth titanate catalyst material. 3‑x Nb x O 12 , wherein 0.15<=x<=0.40, the molar ratio of Bi, Ti and Nb is taken as bismuth oxide, titanium dioxide and niobium pentoxide; step two: the raw materials in step one and the mass ratio of the molten salt are mixed, then the mixture is put into a crucible and fully grinded to obtain a mixture; step three: the mixture prepared in step two is fired in a muffle furnace, and a light yellow product is obtained after cooling; step four: the light yellow product prepared in step three is washed with deionized water, filtered and dried to obtain a sheet-shaped Nb element doped bismuth titanate catalyst powder. The technology can significantly improve the structural uniformity, defect concentration and piezoelectric response activity of the material, greatly reduce the energy consumption and time cost, provides an efficient path for large-scale production of high-performance catalysts, and has a wide market prospect.

The invention provides a defluorination preparation method of niobium pentoxide, which comprises the following steps: (1) mixing a niobium hydroxide raw material with deionized water, and stirring until the niobium hydroxide raw material and the deionized water are uniformly mixed to obtain a slurry material; (2) uniformly smearing the slurry-like material on the inner surface of a hollow cylindrical crucible, and putting the hollow cylindrical crucible into the middle section of a glass tube of a microwave tube furnace; (3) inserting a thermocouple from one side of the glass tube, enabling the end part of the thermocouple to be in contact with the slurry-like material in the hollow cylindrical crucible, placing a water vapor generating device on the other side of the glass tube, and enabling a water vapor tube of the water vapor generating device to extend into the glass tube; and (4) starting the water vapor generating device and the microwave tube furnace, raising the temperature of the slurry-like material in the hollow cylindrical crucible to a target temperature, preserving heat for 20-40 minutes, naturally cooling to room temperature, and taking out to obtain niobium pentoxide. According to the method, residual fluorine can be efficiently removed while the purity of niobium pentoxide is guaranteed, the water consumption for washing is reduced, and the process period is shortened.

This invention discloses a ceramic clay composition, ceramics, and their applications, relating to the field of ceramic technology. The ceramics of this invention are obtained by sequentially processing the ceramic clay composition through a process of material conditioning, sieving, casting, air drying, oven drying, and sintering. The introduction of specific proportions of ceramic waste A and B, modified particles with a gallium-coated cuprous oxide core and an alumina shell, and high-entropy oxide solid solutions generated from the reaction of hafnium dioxide, tantalum pentoxide, niobium pentoxide, titanium dioxide, zirconium dioxide, chromium trioxide, and carbon powder, as well as chromium heptacarbonide, into the ceramic clay composition gives the ceramics prepared from the ceramic waste excellent fracture toughness, flexural strength, wear resistance, high-temperature resistance, and self-healing ability. Therefore, this invention has broad application prospects.

This invention relates to the field of piezoelectric materials and discloses a method for preparing a potassium sodium niobate thin film. The method involves first synthesizing a ceramic target material from niobium pentoxide, potassium carbonate, and sodium carbonate in a solid phase; then placing the ceramic target material in a magnetron sputtering apparatus for sputtering to form an amorphous thin film; finally, adding the amorphous thin film to an annealing atmosphere in a crucible for annealing to form a potassium sodium niobate thin film. This method uses magnetron sputtering to prepare an amorphous potassium sodium niobate thin film under conditions below the film crystallization temperature, followed by annealing to crystallize the film. During annealing, an alkali metal atmosphere is used to compensate and control the alkali metal elements in the film. This method is still based on magnetron sputtering, which is suitable for large-size thin film growth, offering strong process controllability and high production efficiency. The alkali metal atmosphere compensation allows for control of the alkali metal element composition in the potassium sodium niobate.

The application discloses a method for producing lithium manganese oxide as a positive material of lithium battery by dry mixing, which comprises the following steps: step one, uniformly mixing LiMnO4, manganese dioxide, nano niobium pentoxide, nano aluminum oxide, LiOH powder and boron trioxide at room temperature, and grinding to obtain a mixture; step two, stirring and mixing the mixture in step one and polyvinyl alcohol to obtain a powder mixture; step three, preparing an acidic solution by heating H2O and adding a mixture of prepared anhydrous ethanol and concentrated hydrochloric acid, and stirring to obtain the acidic solution; step four, taking part of the acidic solution and adding to the powder mixture in step two to obtain a suspension; step five, adding the remaining acidic solution into the suspension in step four, and heating to react in a sealed environment; after the reaction is completed, cooling the reaction product to obtain a crystal coated with emulsified glue; step six, sintering and screening the crystal in step five; and step seven, removing iron from the screened material to obtain a product.

The invention provides a synthesis method for low-temperature controllable adjustment of stannous niobate oxygen vacancy and application, and relates to the technical field of semiconductors. The synthesis method comprises the following steps: uniformly mixing niobium pentoxide and stannous chloride under an oxygen-free condition to obtain a solid-phase mixture, and carrying out molten salt reaction at 300-600 DEG C without an annealing step, so that the reaction product stannous niobate forms an oxygen vacancy and has a channel for rapid transmission of current carriers; according to the technical scheme, niobium oxide and stannous chloride are mixed in the reducing atmosphere to synthesize the high-crystallinity stannous niobate material with controllable oxygen vacancies at low temperature, the defect that high-performance stannous niobate must be subjected to a high-temperature annealing process is overcome, and meanwhile, by controlling the gas flow rate in the reaction process, the high-crystallinity stannous niobate material with controllable oxygen vacancies can be obtained. The aim of controlling and adjusting the quantity of oxygen vacancies under a relatively mild low-temperature condition to control and synthesize stannous niobate materials with different properties is fulfilled by reaction parameters such as a reactant ratio and the like.

The invention relates to the technical field of inductor preparation, and particularly discloses a preparation method of an integrally-formed inductor with a high frequency response speed. The manufacturing method of the integrally-formed inductor comprises the steps that the winding coil is embedded in the ferrite core material, and then the integrally-formed inductor is formed through compression molding and thermocuring. The ferrite core material is mainly prepared from the following raw materials: wrapping soft magnetic ferrite magnetic powder, a resin adhesive, a curing agent, a silane coupling agent and an organic solvent, the coated soft magnetic ferrite magnetic powder is mainly prepared from the following raw materials: ferric oxide, nickel protoxide, zinc oxide, vanadium pentoxide, titanium dioxide, niobium pentoxide, lanthanum trioxide, water and silicon dioxide sol. The integrally-formed inductor has the advantages of being high in saturation flux density Bs, high in effective magnetic permeability mu e retention rate and low in magnetic loss Pcv, the frequency response speed is increased, and market requirements are met.

The invention relates to the technical field of piezoelectric ceramic materials, and discloses large-strain lead-free piezoelectric textured ceramic as well as a preparation method and application thereof, and the ceramic is prepared from a composition containing needle-like niobium pentoxide, carbonate and a copper-vanadium composite additive. The preparation method comprises the following steps: preparing rheological directional slurry, performing tape casting, and performing step-by-step atmosphere regulation and control sintering. Needle-shaped precursors are directionally arranged through tape casting shearing force, oxygen vacancy defects are induced through a reducing atmosphere so as to accelerate a topological chemical reaction, and then defect repairing and variable valence ion solid solution are carried out in an oxidizing atmosphere. Through an in-situ defect auxiliary reaction mechanism, the problems that a traditional template method is complex in process and delayed in reaction kinetics are solved, cooperation of high texture degree and high density is achieved, the electrostrictive strain performance of the material is remarkably improved through lattice distortion, and the method is suitable for preparing the high-performance piezoelectric actuator.

A solid-state imaging device according to an embodiment includes: a semiconductor substrate including a photoelectric conversion element; a lens disposed above a first light incident surface of the photoelectric conversion element; and a plurality of columnar structures disposed on a surface parallel to the first light incident surface that is located between a second light incident surface of the lens and the first light incident surface of the photoelectric conversion element. The columnar structure includes at least one of silicon, germanium, gallium phosphide, aluminum oxide, cerium oxide, hafnium oxide, indium oxide, tin oxide, niobium pentoxide, magnesium oxide, tantalum pentoxide, titanium pentoxide, titanium oxide, tungsten oxide, yttrium oxide, zinc oxide, zirconia, cerium fluoride, gadolinium fluoride, lanthanum fluoride, and neodymium fluoride.

The invention belongs to the field of hydrogen storage materials, and provides a hydride hydrogen storage material and a preparation method thereof. According to the preparation method, a block material is prepared through discharge plasma sintering forming by adopting a multi-level collaborative design of a reactive composite hydride phase formed by magnesium hydride and lithium borohydride, an ordered mesoporous carbon and hexagonal boron nitride composite carrier structure, an atomic layer deposition oxide coating layer, a niobium pentoxide and titanium hydride catalyst and a heat-conducting outer coating; the comprehensive performance that the reversible hydrogen storage mass fraction is 5.5-7.0 wt%, the capacity retention ratio after 50 times of circulation is larger than or equal to 90%, and the temperature gradient in the block is smaller than or equal to 10 DEG C / cm is achieved, and the multiple contradictions between the high hydrogen storage capacity and the block mechanical strength, between the oxide coating layer stability and the hydrogen diffusion rate and between the heat conduction uniformity and the structural integrity are solved. The method has a wide application value in a solid hydrogen storage system.

The application discloses a hetero-epitaxial niobium pentoxide thin film and a preparation method and application thereof, and belongs to the technical field of thin film deposition. The preparation method comprises the following steps: placing a substrate and target material in a vacuum system, bombarding the target material through a pulse laser, and depositing an initial hetero-epitaxial niobium pentoxide thin film on the surface of the substrate; and performing annealing treatment on the initial hetero-epitaxial niobium pentoxide thin film to obtain the hetero-epitaxial niobium pentoxide thin film. The hetero-epitaxial niobium pentoxide thin film is grown by using a pulse laser deposition system, the deposition rate of the thin film is high, the repeatability is good, the prepared thin film can keep a high consistency in purity and a stoichiometric ratio with the target material, the process control can be performed on a nanometer scale, the thickness of the thin film can be adjusted to a nanometer level, the preparation method is simple, the target material can be reused, the growth parameters can be flexibly regulated, the growth state of the thin film can be monitored in real time, and a high-quality hetero-interface structure is obtained.

This invention discloses a composite electrode material and its preparation method, belonging to the field of functional materials technology. The composite electrode material is composed of metal oxides, alkaline phenolic resin, phytic acid, monolayer graphene oxide, coupling agent KH5500, alkaline silica sol, and niobium ammonium oxalate. A continuous carbon network carbonized from phenolic resin serves as the substrate, monolayer graphene oxide as the conductive framework, and niobium pentoxide from the pyrolysis of niobium ammonium oxalate as the interfacial conductive bridging structure. These three components crosslink to form a three-dimensional conductive network. The preparation method includes KH550-modified graphene oxide, construction of the phytic acid composite system, ball milling of the main slurry, low-temperature introduction of phenolic resin for molding, and curing and sintering. This invention possesses high conductivity, high heat resistance, corrosion resistance, and high mechanical strength. The three-dimensional conductive network effectively reduces internal resistance and exhibits excellent cycle stability, making it widely applicable to supercapacitors and lithium-ion batteries. It solves the problems of poor heat resistance, weak interfacial bonding, and easy corrosion of traditional electrode materials.

The invention belongs to the technical field of ceramic sand preparation, and particularly relates to ceramic polishing sand and a preparation method thereof. The ceramic polishing sand is prepared from the following raw materials: zirconium oxide, white corundum, flint clay, lithium tetraborate, niobium pentoxide, strontium zirconate, cerium hexaboride, nano magnesium oxide, a binder and a dispersant. According to the ceramic polishing sand, zirconium oxide serves as a main crystalline phase, basic hardness and abrasion resistance are provided for the ceramic polishing sand, and the hardness and cutting performance of the ceramic polishing sand are further enhanced through white corundum; a mixture of flint clay, lithium tetraborate, niobium pentoxide, strontium zirconate, cerium hexaboride and nano magnesium oxide is used as a ceramic modifier, so that the compactness and mechanical strength of the ceramic polishing sand are improved and the sintering temperature is reduced in the sintering process. In addition, the binder and the dispersant are added, and the raw materials have a synergistic effect, so that the prepared ceramic polishing sand has excellent fracture toughness, single-particle compressive strength and Vickers hardness.

The present invention provides improved optical properties while suppressing cracking. Glass (10) has an internal transmittance of 85% or more with respect to light having a wavelength of 450 nm and in terms of a thickness of 10 mm, has a d-line refractive index nd of 2.050 or more, and contains at least one of TiO2 and Li2O on an oxide basis. In terms of mol% on an oxide basis, the glass contains Bi2O3 at 20.0% to 40.0%; SiO2 at 0% to 5.0%; Al2O3 at 0% to 5.0%; B2O3 at 15.0% to 35.0%; P2O5 at more than 0% but no more than 20.0%; Nb2O5 at 0% to 12.0%; TeO2 at 1.0% to 30.0%; ZnO at 0% to 20.0%; ZrO2 at 0% to 10.0%; TiO2 at 0% to 20.0%; WO3 at 0% to 7.5%' RO at 0% to 7.0%; and R'2O at 0% to 10.0%. The parameter (A) represented by formula (1) is 0.95 or more.

The invention relates to a preparation method of ultrafine niobium pentoxide powder, which comprises the following steps: (1) preparing fluorine niobic acid liquid: controlling the concentration of niobium oxide in fluorine niobic acid to be 60-80g / L, and adding ammonia water with the concentration of 15-20% into the fluorine niobic acid liquid through a peristaltic pump; (2) neutralizing the fluoroniobic acid by using ammonia water, and controlling the highest reaction temperature to be 80-90 DEG C; (3) continuously introducing a small amount of ammonia water until the pH value of the system is 3-5 in a positive adding manner; (4) controlling the stirring rotating speed to be 100-150r / min and the ultrasonic frequency to be 40-60KHz, and performing ultrasonic treatment while stirring; (5) adding a dispersing agent, wherein the mass ratio of the dispersing agent to niobium oxide in the fluoroniobic acid solution is 1: (9-12); (6) continuing to add ammonia water until the pH value of the system is 8-9, and performing corresponding filtration; (7) filtering the obtained niobium hydroxide solid, and washing: washing the niobium hydroxide solid with 3 g / L dilute ammonia water at 50-75 DEG C for three times; and (8) drying and calcining: heating the washed niobium hydroxide in a programmed manner to 850 DEG C, and keeping the temperature for 2 hours.

The application discloses high-entropy doped porous carbon and a preparation method thereof, a silicon-carbon electrode material, a battery, and the high-entropy doped porous carbon comprises: a porous carbon framework; high-entropy doped niobium pentoxide, the high-entropy doped niobium pentoxide is loaded on the surface and inside the pore of the porous carbon framework, and the chemical formula of the high-entropy doped niobium pentoxide is Nb 2‑x M x O5, 0.01<=x<=0.2, M is a doping element, the doping element comprises at least five doping components in Mg, Ca, Sr, Ba, Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, Ga, In, Sn, Sb, Y, Mo, La, Ce; and the mass ratio of the high-entropy doped niobium pentoxide to the porous carbon framework is (0.01-0.2):1. The high-entropy doped porous carbon has good mechanical strength to inhibit the volume expansion of silicon, thereby enhancing the use stability and service life of the porous carbon in long-term use.

The invention discloses a copper-doped niobium pentoxide photocatalyst, a preparation method of the copper-doped niobium pentoxide photocatalyst and application of the copper-doped niobium pentoxide photocatalyst to degradation of norfloxacin. The general chemical formula of the catalyst is Cux-Nb2O5, x is more than or equal to 0.01 and less than or equal to 0.20, and the catalyst has a three-dimensional flower-shaped hierarchical structure. The preparation method comprises the following steps: dissolving a niobium source, an ammonium source and a copper source in a solvent, realizing effective doping of Cu in Nb2O5 crystal lattices by combining a one-step hydrothermal / solvothermal method with a gradient heating program, and then washing, drying and carrying out heat treatment to obtain a final product. The energy band structure and charge separation efficiency of Nb2O5 are cooperatively regulated and controlled through Cu doping, the band gap of the Nb2O5 is narrowed, and visible light absorption and catalytic activity are remarkably enhanced. The degradation performance of the catalyst on a norfloxacin solution under visible light is effectively improved, the catalyst has the advantages of being simple in preparation process, low in cost and environmentally friendly, and a high-performance new material is provided for treatment of degradation-resistant antibiotic wastewater.

The invention belongs to the technical field of cadmium telluride thin-film solar cells, and particularly relates to application of niobium pentoxide in preparation of an interface-modified cadmium telluride thin-film solar cell. The niobium pentoxide with high dielectric property, diffusion barrier function and interface regulation and control effect is deposited on the surface of the cadmium telluride light absorption layer, and the surface and back contact interface performance of the CdTe thin film is optimized, so that the interface modified cadmium telluride thin film solar cell device with high photoelectric conversion efficiency and open-circuit voltage is obtained; the technical defects of the cadmium telluride thin film solar cell in the prior art are overcome.

The application particularly relates to a photochromic TPU film and a preparation method thereof, the photochromic TPU film comprising a thermoplastic polyurethane elastomer and a photochromic material, the photochromic material being Nb 5+ mixed at a molar ratio of 20-120 mol%, wherein the doped metal ion is Fe 3 , or by adding a corresponding metal salt, the molar ratio of the doped metal to Nb is controlled to optimize the doped metal and the particle distribution concentration, and the TPU improves the mechanical properties of the film. The photochromic TPU film of the application adopts a metal in-situ growth technology to simplify the preparation process, grows the Nb2O5 nanoparticles doped with metal elements in the TPU in-situ, avoids the dependence on high energy consumption and complex preparation methods, greatly reduces the production cost, and has good potential for large-scale production.

The application relates to a high-temperature negative temperature coefficient thermosensitive ceramic material and a preparation method thereof. 1‑ x Nb x O3 is prepared by a solid phase reaction method. The following raw materials are weighed according to percentage by weight: lanthanum sesquioxide 73.315-76.112%, aluminum sesquioxide 20.701-23.888%, and niobium pentoxide 1.540-5.985%; the preparation method comprises the following steps: S1. weighing; S2. mixing; S3. grinding; S4. pre-sintering; S5. secondary grinding; S6. tabletting; S7. cold isostatic pressing; S8. sintering; S9. platinum slurry coating; and S10. annealing. The high-temperature negative temperature coefficient thermosensitive ceramic material has a wide temperature range (600-1400 DEG C) and excellent aging stability; after aging for 400-600 hours at a high temperature of 1000 DEG C, the resistance drift rate of the LaAl 1‑x Nb x O3 sample is 0.906-3.352%, and the service life is long; in addition, the powder particles prepared by the application have high dispersity and are not prone to agglomeration, and the material strength is high.

The application provides a zirconia ceramic and a preparation method thereof, and belongs to the technical field of ceramics. First, zirconia, diyttrium trioxide, di-niobium pentoxide, erbium oxide, a dispersing agent and water are mixed to obtain a mixed slurry; then the mixed slurry is sequentially subjected to sand milling, spray granulation and dry pressing forming to obtain a ceramic green body; finally, the ceramic green body is sequentially subjected to glue removal and sintering to obtain the zirconia ceramic. The zirconia ceramic prepared by the application has a photochromic effect, can reversibly change color through alternating 365nm ultraviolet light irradiation and heating treatment, and the color development-decoloration process has high reversibility and cycle life.

This invention relates to the field of optical thin film technology, specifically to a low-phase-difference metal mirror suitable for space environments, its fabrication method, and its applications. It includes an optical substrate and, sequentially deposited on the optical substrate, an adhesive layer, a metal layer, a first protective layer, a first low-refractive-index layer, a high-refractive-index layer, a second low-refractive-index layer, and a second protective layer. The optical substrate is silicon; the adhesive layer is made of nickel-chromium; the metal layer is made of silver; both the first and second protective layers are made of aluminum oxide; the first and second low-refractive-index layers are made of silicon dioxide; and the high-refractive-index layer is made of niobium pentoxide. This invention achieves high reflectivity over a wide wavelength range through the metal layer, utilizes the asymmetric equivalent layer theory in optical thin film design for phase difference control design to achieve phase difference control in the communication band, and utilizes the outermost protective layer to improve the adaptability and stability of the optical element under space environment conditions.

The application relates to the technical field of piezoelectric light-transmitting functional ceramics, and discloses a high-light-transmitting ceramic material and a preparation method thereof, which comprises the following preparation steps: taking sodium carbonate, potassium carbonate, di-niobium pentoxide, di-antimony trioxide, di-samaria trioxide and zirconium dioxide powder raw materials, carrying out one-time ball milling and drying on the powder raw materials to obtain mixed powder; carrying out pre-sintering and secondary ball milling on the mixed powder, and then carrying out compression molding to form a compression tablet; sintering, polishing and obtaining a ceramic matrix; spraying a composite slurry to the surface of the ceramic matrix, carrying out heat treatment, and cooling to room temperature to obtain the high-light-transmitting ceramic material. The ternary co-doping of di-antimony trioxide, di-samaria trioxide and zirconium dioxide generates antimony-samaria-zirconium liquid phase in the ceramic material, fills and eliminates the pores of the ceramic material, and the prepared ceramic material has excellent optical transmittance, piezoelectric performance and mechanical strength.