213 results about "Tantalum oxide" patented technology

The invention provides a diaphragm and a preparation method thereof and a lithium ion battery, the diaphragm comprises a base membrane layer and a composite functional layer, the composite functional layer comprises hydrophobic SiO2 aerogel modified by a hydrophobic agent, a conductive ion polymer and a solid electrolyte, and the composite functional layer respectively accounts for 3-12wt%, 0.5-1.0 wt% and 0.5-1.5 wt% of the total mass of the diaphragm; the hydrophobic agent comprises trimethylchlorosilane, hexamethyldisilazane, perfluorooctyltriethoxysilane, polyvinylidene fluoride, polydimethylsiloxane and the like, the conductive ionic polymer comprises polyvinylpyrrolidone, lithium polymethacrylate, lithium polystyrene sulfonate, polyacrylamide and the like, and the solid electrolyte comprises lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide and the like. The wettability is improved by the high porosity of the hydrophobic SiO2 aerogel, the stability and strong conductivity of a physical conductive network of the solid electrolyte and the ion affinity and amphoteric binding capacity of the conductive ion polymer are optimized, the electrochemical performance and thermal stability of the interface are optimized, and comprehensive optimization of the thermal-electric-interface performance of the diaphragm is realized through combination.

The invention discloses a titanium-based-iridium tantalum oxidation coating anode and a preparation method and application thereof, and belongs to the technical field of anode preparation, and the preparation process of the titanium-based-iridium tantalum oxidation coating anode comprises the steps that a titanium substrate is brushed with a solution containing a tantalum source A, then sintering is conducted, brushing-sintering is repeated, and a tantalum-coated titanium substrate is obtained; the tantalum-coated titanium substrate is brushed with the iridium-tantalum oxidation coating liquid, then sintering is carried out, and brushing-sintering is repeated, so that the tantalum-coated titanium substrate is obtained; the iridium-tantalum oxidation coating liquid contains a tantalum source B, an iridium source and a zirconium source; in the iridium tantalum oxidation coating liquid, the mass ratio of tantalum to iridium is (6-7): (4-5), according to the preparation method provided by the invention, through two times of brushing, the tantalum content in the titanium-based-iridium tantalum oxidation coating anode is more than 5% greater than the iridium content, and when the titanium-based-iridium tantalum oxidation coating anode is used for an alkaline citric acid electroplating system, the decomposition of a complexing agent can be effectively inhibited, the components of the electroplating liquid are maintained to be stable, so that the quality of a plating layer is ensured, and the service life of the plating layer is prolonged. The maintenance cost of the plating solution is reduced and the service life is prolonged.

The invention discloses a method for preparing low-oxygen tantalum powder through magnesium reduction. Aiming at the defects of more impurities, non-uniform particles, complex process and the like in the existing tantalum powder preparation technology, the method comprises the following steps: firstly, pretreating tantalum oxide powder and anhydrous calcium chloride, so that tantalum oxide is uniformly coated with calcium chloride; and mixing the pretreated raw materials with magnesium chips, introducing high-purity argon into a closed container for multiple times of replacement, carrying out heating and heat preservation to generate a reaction, separating a product, and then carrying out water washing, acid pickling and drying treatment to obtain the tantalum powder. According to the method, magnesium and tantalum oxide are fully reacted by virtue of heat absorption and fluxing effects of calcium chloride, so that composite substances such as tantalate are prevented from being generated, and impurity introduction is reduced. The oxygen content of the prepared low-oxygen tantalum powder is smaller than 3000 ppm, the apparent density is 1.3-1.5 g / cm < 3 >, powder particles are in a coralline shape and are uniform in size, operation is easy and convenient, the requirement for equipment is low, and the low-oxygen tantalum powder has good application prospects in the field of electronic component manufacturing.

The invention relates to the technical field of battery materials, and discloses a composite solid electrolyte diaphragm as well as a preparation method and application thereof. The composite solid electrolyte diaphragm comprises a base membrane and a solid electrolyte coating arranged on at least one surface of the base membrane, the solid electrolyte coating comprises an electrolyte I and an electrolyte II; the electrolyte I is lithium titanium aluminum phosphate and lithium lanthanum zirconium tantalum oxide; and the electrolyte II is a compound of lithium bis (oxalate) borate and acetamide in a molar ratio of 1: (6.5-7.5). The composite solid electrolyte diaphragm provided by the invention can realize relatively high ionic conductivity, and when the composite solid electrolyte diaphragm is used in a lithium ion battery, the battery can have relatively low internal resistance.

The invention belongs to the technical field of development and manufacturing of solid-state electrolyte materials and solid-state lithium batteries, and particularly relates to an all-solid-state oxide-polymer electrolyte membrane as well as a preparation method and application thereof. The electrolyte membrane comprises a polymer matrix, a lithium salt, butanedinitrile, lithium lanthanum zirconium tantalum oxide and graphite phase carbon nitride, the polymer matrix, the lithium salt, the butanedinitrile, the lithium lanthanum zirconium tantalum oxide and the graphite phase carbon nitride are uniformly mixed to form a solid film; the polymer matrix is polyacrylonitrile and forms a framework of the electrolyte membrane; the lithium salt, the butanedinitrile, the lithium lanthanum zirconium tantalum oxide and the graphite phase carbon nitride are at least physically and uniformly dispersed in the polymer matrix. The electrolyte membrane can be prepared through the steps of slurry preparation, defoaming treatment, membrane forming processing, drying and curing and the like, and can be used in a solid-state lithium battery, so that the contact between the electrolyte membrane and an electrode interface is improved, side reaction is inhibited, the ion transmission efficiency and mechanical property are improved, the interface impedance is reduced, and the cycling stability and safety of the solid-state lithium battery are enhanced.

The invention relates to the technical field of niobium-tantalum-iron ore purification, in particular to a method for preparing high-purity tantalum pentoxide and niobium pentoxide from niobium-tantalum-iron ore. The method comprises the following steps: firstly, adding ammonium fluoride and ammonium sulfate to help mineral decomposition and reduce the roasting temperature, then treating the niobium-tantalum iron ore by using a sulfuric acid-hydrofluoric acid mixed solution to fully dissolve niobium-tantalum oxides, then extracting and separating niobium and tantalum by using a specific solvent system, and finally adding ammonia water to precipitate and calcine to obtain the niobium-tantalum iron ore. The high-purity niobium pentoxide and tantalum pentoxide are prepared, the product yield is high, the impurity content is low, and the niobium pentoxide and tantalum pentoxide are suitable for being used as raw materials of capacitor-grade tantalum powder and niobium powder.

The invention provides a method for extracting tantalum and niobium from tungsten tailings, and belongs to the technical field of rare metal recovery, and the method comprises the following steps: adding a reducing agent, a fluxing agent, a covering agent and a slag former into the tungsten tailings, and heating and smelting under the protection of inert gas to obtain an alloy ingot; the alloy ingot is crushed and then leached through hydrochloric acid, and acid leaching residues containing tantalum, niobium and tungsten are obtained; the acid leaching residues are subjected to alkaline leaching, and alkaline leaching residues containing tantalum and niobium are obtained; the alkaline leaching residues are leached through hydrofluoric acid and sulfuric acid, and decomposition liquid is obtained; and extracting and separating the decomposition liquid to obtain tantalum hydroxide and niobium hydroxide, and respectively calcining the tantalum hydroxide and niobium hydroxide to obtain tantalum oxide and niobium oxide. The method is simple in technological process, convenient to operate, low in cost and suitable for industrial production, tantalum and niobium can be efficiently extracted from tungsten tailings, and good economic benefits and environmental benefits are achieved.

The invention discloses an anodic oxidation method for improving the uniformity of a dielectric layer of a capacitor. The anodic oxidation method comprises the following steps that a tantalum block is pretreated and then placed in an electrolytic bath; adding electrolyte into the electrolytic bath, and performing oscillation circulation through an oscillator; a tantalum block is sequentially subjected to a pre-oxidation procedure, a main oxidation procedure, a stabilization procedure, heat treatment and constant-pressure treatment, the tantalum block is taken out after treatment is finished, and the tantalum block is cleaned and dried to finish anodic oxidation. The ultrasonic oscillator is additionally arranged in the electrolytic bath, so that the electrolyte concentration gradient can be eliminated, and the thickness uniformity of the dielectric layer is improved. And by adding ammonium dihydrogen phosphate, micropores are filled, the surface of the tantalum block is passivated, and the performance of a capacitor prepared from the tantalum block is improved. Through a staged dynamic oxidation method and a composite electrolyte formula, the uniformity and reliability of a tantalum oxide dielectric layer are remarkably improved, and the method is suitable for industrial production of a high-reliability tantalum capacitor.

The invention discloses a device and a method for preparing tantalum powder by reducing gaseous magnesium, and solves the problems of high oxygen content, poor particle uniformity, incomplete reaction and the like in the prior art. The device adopts a vertical multi-layer reaction furnace structure, and realizes efficient reduction of tantalum oxide through heating of a resistance wire and reaction with gaseous magnesium. The method comprises gaseous magnesium reduction and product post-treatment. The oxygen content of the tantalum powder prepared through the method is controlled to be 3000-6000 ppm, the specific volume reaches 80000-100000 mu F.V / g, the apparent density ranges from 1.5 g / cm < 3 > to 1.8 g / cm < 3 >, particle size distribution is uniform, and the method is suitable for large-scale production of electronic-grade tantalum powder.

The present application relates to the technical field of target materials, and specifically discloses a tin oxide-based target material, a preparation method therefor, and a use thereof. Raw materials for the preparation of the tin oxide-based target material of the present application comprise, in parts by mass, 91-95 parts of tin oxide, 1.5-3.5 parts of tantalum oxide, 1.5-3.5 parts of zinc oxide, 0.5-2 parts of tungsten oxide, and 0.3-1.5 parts of gadolinium oxide, and further comprise a binder and a plasticizer. The present application further provides a preparation method for the tin oxide-based target material and a use of the tin oxide-based target material. The tin oxide-based target material provided by the present application has high density and extremely low resistivity, wherein the density of the tin oxide-based target material is greater than or equal to 6.5 g / m3, and the resistivity thereof is smaller than or equal to 1×10-2Ω·cm. Therefore, the tin oxide-based target material can be suitable for direct-current (DC) magnetron sputtering coating. In addition, due to the advantages of good light transmittance and low resistivity, the tin oxide-based target material of the present application can further improve battery conversion efficiency and can be applied to photovoltaic heterojunction batteries and perovskite batteries.

The invention provides a dielectric filler-doped solid electrolyte, a lithium metal battery and a preparation method, the dielectric filler-doped solid electrolyte comprises a polyether matrix, and the polyether matrix is formed by dispersing a lithium salt and a dielectric filler, the dielectric filler is two or more of barium titanate (BaTiO3), strontium titanate (SrTiO3), zirconium oxide (ZrO2), hafnium oxide (HfO2), titanium oxide (TiO2), cerium oxide (CeO2), zinc oxide (ZnO), lanthanum oxide (La2O3), aluminum oxide (Al2O3), tantalum oxide (Ta2O5) and yttrium oxide (Y2O3).

The utility model belongs to the technical field of ceramic particle processing, and particularly relates to an impurity removal device for grinding raw materials, which comprises a fixed seat, and a screening frame is arranged on the inner side of the fixed seat; the top end of the inner side of the screening frame is movably connected with a screening net. Sliding frames are fixedly connected to the four end corners of the inner side of the fixing base. The outer side of the sliding frame is slidably connected with a connecting base. The connecting seat is fixedly connected with the screening frame; a shaking assembly; the screening frame is arranged on the inner side of the screening frame; the shaking assembly is used for being matched with the screening net for use. Through the cooperative design of the reciprocating assembly and the shaking assembly, the reciprocating assembly drives the screening net to rapidly move left and right to screen ceramic tantalum oxide, the shaking assembly drives the screening net to move up and down in the screening frame to conduct shaking screening on the ceramic tantalum oxide, and through the dual simultaneous operation screening mode, the screening efficiency is improved. And the screening effect on the ceramic tantalum oxide is improved.

The invention discloses a surface modification method for a silicon-carbon composite material electrode, which belongs to the technical field of lithium ion battery negative electrode materials, and mainly comprises the following steps: modifying the surface of the silicon-carbon composite material electrode by magnetron sputtering; wherein the modification material comprises a metal material and / or a solid electrolyte material; the metal material is selected from Al, Cu or In; the solid electrolyte material is selected from titanium aluminum lithium phosphate or gallium-doped lithium lanthanum zirconium tantalum oxide. The method solves the problems of poor conductivity, unstable SEI film and volume effect of the silicon-carbon electrode, and after the prepared electrode is assembled into a battery, the performance of the battery is superior to that of an unmodified electrode, the battery is adaptive to a solid-state battery, and the electrode has industrialization potential and application value.

The invention discloses a TaC coating, a preparation method of the TaC coating, a crucible containing the TaC coating and application of the crucible, and belongs to the field of semiconductor coating material preparation. The method comprises the following steps: coating the surface of a carbon matrix with first tantalum-containing slurry, and carrying out solid-phase sintering reaction to obtain a porous preset coating; placing the porous preset coating and tantalum oxide powder in a closed container, gasifying the tantalum oxide powder through vapor deposition, and enabling gaseous tantalum oxide to permeate into the porous structure of the porous preset coating and react with the surface of the carbon matrix exposed in the porous structure to generate a continuous tantalum carbide barrier layer in situ; and finally, coating the surface of the porous preset coating subjected to vapor deposition with the second tantalum-containing slurry, curing, and carrying out densification sintering in a hydrocarbon atmosphere to obtain the tantalum-containing porous coating. The TaC coating obtained through the method is high in bonding force with an interface, uniform in thickness, high in structure morphology density, few in grain boundary pores and suitable for being applied to the high-purity semiconductor crystal growth industry.

The embodiment of the invention discloses a donor-receptor complementary co-doped hafnium oxide-based ferroelectric film material and a preparation method thereof. The method comprises the following steps: according to the composition of the donor-receptor complementary co-doped hafnium oxide-based ceramic target material, mixing raw material powder to obtain mixed raw material powder; calcining the mixed raw material powder under a preset condition; pressing and molding the calcined product into a target material green body; and sintering the target material green body to obtain the donor-receptor complementary co-doped hafnium oxide-based ceramic target material. Wherein the composition of the donor-acceptor complementary co-doped hafnium oxide-based ceramic target material is expressed as AxByHf (1-x-y) O2, A is a donor and comprises elements niobium and tan, and B is an acceptor and comprises elements yttrium and lanthanum; x is more than 0.01 and less than 0.05, and y is more than 0.01 and less than 0.05; the raw material powder containing the donor comprises niobium oxide and tantalum oxide, and the raw material powder containing the acceptor comprises yttrium oxide and lanthanum oxide; and taking the donor-acceptor complementary co-doped hafnium oxide-based ceramic target material as a sputtering target, and obtaining the donor-acceptor complementary co-doped hafnium oxide-based ferroelectric material film by using a pulse laser deposition method.

This invention provides a method for producing high-purity aluminum-niobium-tantalum master alloys and co-producing ammonium fluoride, belonging to the fields of metallic materials and inorganic chemicals. The invention involves mixing fluoroniobic acid, fluorotantalic acid, and ammonia water for a precipitation reaction to obtain a precipitate and an ammonium fluoride solution. The ammonium fluoride solution is then concentrated, cooled for crystallization, dehydrated, and dried sequentially to obtain ammonium fluoride. The precipitate is then dried and oxidized and calcined sequentially to obtain an oxide. The oxide, aluminum powder, potassium chlorate, and calcium fluoride are mixed and subjected to a vacuum aluminothermic reaction to obtain the high-purity aluminum-niobium-tantalum master alloy. This invention, considering both broadening the range of raw material selection and optimizing the production process, reacts fluoroniobic acid, fluorotantalic acid, and ammonia water to produce niobium hydroxide and tantalum hydroxide precipitates, which are then oxidized and calcined to form niobium and tantalum oxides. The high-purity aluminum-niobium-tantalum alloy is then prepared using a vacuum aluminothermic reaction. Simultaneously, ammonium fluoride can be co-produced, resulting in high raw material utilization.

The present application relates to the field of electrochemical wastewater biological treatment technology, and discloses an electrode, a preparation method thereof and application of the electrode in strengthening methane production of a membrane bioreactor.The preparation method comprises the following steps: step (1): impregnating a foamed carbon matrix in a dispersion system containing a tantalum precursor under vacuum conditions, and obtaining an intermediate after drying; step (2): heat treating the intermediate at 400-600 DEG C in the presence of a protective atmosphere for at least 1 h, and obtaining a foamed carbon electrode loaded with modified tantalum oxide.The present application adopts an impregnation-heat treatment method to prepare a foamed carbon electrode loaded with modified tantalum oxide, and uses a MEC-AnMBR system constructed by the electrode to treat low-intensity municipal wastewater, thereby achieving efficient anaerobic digestion methane production and membrane pollution collaborative control under a full temperature gradient, and providing a low-cost, easily enlarged technical solution for energy self-sufficiency of a wastewater treatment plant.

The present invention relates to an aluminum-tantalum oxide glass with high hardness, high Young's modulus, and ultra-high refractive index, as well as a preparation method and application thereof. The aluminum-tantalum oxide glass comprises: 25-32 mol% Al2O3, 30-36 mol% Ta2O5, 5-12 mol% ZrO2, 5-15 mol% of a first metal oxide, and 5-15 mol% of a second metal oxide, with the total molar sum of the components being 100 mol%. The first and second metal oxides are selected from two of the group consisting of Gd2O3, La2O3, Sc2O3, Tm2O3, Lu2O3, Yb2O3, HfO2, Nb2O5, and Ga2O3.

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of high-fluidity tantalum oxide. According to the method, ammonium carbonate is adopted as a precipitator, ammonium carbonate can react with various metal ions to generate insoluble precipitates, high selective precipitates are achieved, precipitation reaction can be accurately controlled, and side reactions and unnecessary impurity precipitates are reduced. By-products of the reaction of ammonium carbonate and fluotantalic acid are water and carbon dioxide, and new impurities are not introduced, so that the quality of the final product is favorably improved. The preparation method provided by the invention is easy to operate and control, the solution with the required concentration is prepared, and the precipitation rate and degree can be conveniently controlled in the reaction process; meanwhile, complex equipment and strict condition control are not needed, laboratory and industrial field operation is facilitated, and equipment investment and operation and maintenance cost are reduced; by-products can be effectively recycled, environmental pollution is reduced, and the requirement of sustainable development is met.

The invention discloses high-purity superfine high-entropy nitride (Hf, Zr, Ta, Nb and Ti) N powder as well as a low-temperature synthesis method and application of the high-purity superfine high-entropy nitride (Hf, Zr, Ta, Nb and Ti) N powder. The method comprises the following steps: by taking mixed powder of hafnium oxide, zirconium oxide, tantalum oxide, niobium oxide and titanium oxide as a raw material, adding magnesium as a catalyst, adding sodium chloride and potassium chloride as ion diffusants and adding carbon powder as an oxygen trapping agent, mixing, heating to 900-1100 DEG C in a nitrogen atmosphere at a gas flow rate of 100-300ml / min, carrying out heat treatment for 4-8 hours, and cooling along with a furnace temperature, thereby obtaining the hafnium oxide / zirconium oxide / tantalum oxide composite material. The powder obtained after heat treatment is soaked in a hydrochloric acid solution with the concentration being 0.5 mol / L for 0.5-2 h in the stirring state, then filtering and drying are conducted for 12 h, and the high-entropy nitride powder is prepared and has the molecular formula of (Hf < 0.2 > Zr < 0.2 > Ta < 0.2 > Nb < 0.2 > Ti < 0.2 >) Nx. The synthesis method is simple in process, the prepared high-entropy nitride powder has a single high-entropy nitride (Hf0. 2Zr0. 2Ta0. 2Nb0. 2Ti0. 2) Nx phase and has the characteristics of small particle size, low oxygen content and high purity, the particle size of the powder is 0.09-0.14 mu m, and the oxygen content is 0.07-0.18 wt%.

Various embodiments herein relate to electrochromic devices and electrochromic device precursors, as well as methods and apparatus for fabricating such electrochromic devices and electrochromic device precursors. In certain embodiments, the electrochromic device or precursor may include one or more particular materials such as a particular electrochromic material and / or a particular counter electrode material. In various implementations, the electrochromic material includes tungsten molybdenum oxide. In these or other implementation, the counter electrode material may include nickel tungsten oxide, nickel tungsten tantalum oxide, nickel tungsten niobium oxide, nickel tungsten tin oxide, or another material.

A capacitor 1a includes tantalum metal 20 and a dielectric layer 10. The dielectric layer 10 covers the tantalum metal and contains tantalum oxide. The dielectric layer 10 contains fluorine and phosphorus. The dielectric layer 10 includes, for example, a first portion 11 and a second portion 12. The first portion 11 is separate from the tantalum metal 20 in the thickness direction of the dielectric layer 10. The second portion 12 is in contact with the tantalum metal 20 in the thickness direction of the dielectric layer 10.

The invention relates to a composite pane (1), in particular for a projection assembly (100) in a vehicle, at least comprising an outer pane (2), a thermoplastic intermediate layer (4), an inner pane (3), and a reflective layer (9) which is suitable for reflecting light, in particular p-polarized light. The outer pane (2) has an exterior-side surface (I) and an interior-side surface (II), and the inner pane (3) has an exterior-side surface (III) and an interior-side surface (IV). The reflective layer (9) is provided on the interior-side surface (IV) of the inner pane (3), said reflective layer (9) being positioned in at least one composite pane (1) display region in which, in a viewing direction through the composite pane (1) starting from the interior-side surface (IV) of the inner pane (3), the reflective layer (9) is formed spatially in front of an opaque background. A transparent protective layer (7) is provided on the reflective layer (9) and additionally on at least some regions of the interior-side surface (IV) of the inner pane (3) not occupied by the reflective layer (9), preferably on the entire interior-side surface of the inner pane not occupied by the reflective layer, said protective layer being formed on the basis of silicon oxide (SiOx), silicon nitride, titanium oxide, zirconium oxide, hafnium oxide, niobium oxide, tantalum oxide, aluminum oxide, aluminum nitride or on the basis of silicon oxide or silicon nitride doped with Al, Ti, Zr, Hf, and / or B. The invention also relates to a method for producing such a composite pane (1) and to the use thereof.

The application discloses a short rod-shaped tantalum oxide-graphene quantum dot nanocomposite, a preparation method and application thereof, and belongs to the technical field of nanomaterial science and photocatalytic degradation. The method comprises the following steps: heating citric acid monohydrate, ultrasonically dispersing the cooled citric acid monohydrate in water to obtain a graphene quantum dot solution; adding an ethanol solution into a n-butanol solution of pentachlorotantalum, uniformly mixing, and adjusting the pH value of the mixed solution; collecting white precipitates at the bottom, washing the white precipitates with an ethanol solution until the pH value of the supernatant is 7, and performing suction filtration to obtain newly prepared tantalum acid solid; adding the newly prepared tantalum acid solid and hydrogen peroxide into the graphene quantum dot solution, continuing to heat until the solution is clear, and evaporating water to collect solid into a tube furnace, and annealing under a nitrogen atmosphere to obtain the GQD@Ta2O5 nanocomposite. The nanocomposite prepared by the application is a high-efficiency photocatalyst, and can efficiently photocatalyze and degrade various organic pollutants.

A method for making a supported tantalum oxide catalyst precursor or catalyst with controlled Ta distribution and the resulting supported Ta catalyst. In an embodiment, the method comprises selecting a Ta-precursor with appropriate reactivity with the surface hydroxyls of the solid oxide support material to give a desired Ta distribution in the catalyst precursor or catalyst. In an embodiment the method comprises controlling the number of surface hydroxyls available on the support material to react with the Ta-precursor by thermal methods, such as calcination, to achieve the desired Ta distribution.

The invention provides a preparation method and application of a monatomic catalyst for preparing 1, 3-propylene glycol through high-selectivity hydrogenolysis of glycerol. The catalyst is composed of active metal, a metal oxide auxiliary agent A and a carrier. The active metal is Pt, and the metal oxide auxiliary agent A is one or two or more of niobium oxide, tantalum oxide, molybdenum oxide and tungsten oxide. The composition and proportion of the monatomic catalyst are accurately regulated and controlled through a strong electrostatic adsorption method, 1, 3-propylene glycol is prepared through efficient catalysis of selective hydrogenolysis of glycerin, the yield of 1, 3-propylene glycol in a high-concentration glycerin solution (50 wt%) reaches up to 0.43 g of 1, 3-propylene glycol g of the catalyst h <-1 >, and excellent stability is achieved. The method has the advantages that the catalyst is simple and convenient to prepare and low in cost, the precious metal atom utilization rate is 100%, recovery is easy, products are easy to separate, and the reaction process is environment-friendly. According to the technical scheme, the invention provides a novel preparation method and application of the monatomic catalyst for preparing 1, 3-propylene glycol through efficient hydrogenolysis of glycerol, and the monatomic catalyst has an excellent application prospect.

The invention relates to a polycrystalline fused product of formula (Sc2O3)yAx(ZrO2 + HfO2)1-x-y, with 0.030 ≤ y ≤ 0.150, and 0.000 ≤ x ≤ 0.070, and x ≤ y, A denoting an additive selected from Y2O3, Al2O3, CeO2, Yb2O3, Gd2O3, MnO, Bi2O3, La2O3, Pr2O3, Nd2O5, Sm2O3, Eu2O3, Tb4O7, Ta2O5, Nb2O5 and mixtures thereof, ZrO2 + HfO2 + Sc2O3 + A representing more than 98% of the mass of the fused product, MnO expressing the total content of manganese oxides expressed in the form MnO, Pr2O3 expressing the total content of praseodymium oxides expressed in the form Pr2O3, Nd2O5 expressing the total content of neodymium oxides expressed in the form Nd2O5, Tb4O7 expressing the total content of terbium oxides expressed as Tb4O7, Ta2O5 expressing the total content of tantalum oxides expressed as Ta2O5, and Nb2O5 expressing the total content of niobium oxides expressed as Nb2O5.

This invention discloses a method for preparing a low-absorption tantalum oxide thin film and its application in DWDM filters. The method includes the following steps: S1, placing the substrate in the reaction chamber of a mid-frequency magnetron sputtering system and evacuating the reaction chamber; S2, introducing argon and oxygen into the reaction chamber; S3, using a tantalum target, turning on the power of the mid-frequency magnetron sputtering system for pre-sputtering; S4, performing a second sputtering; S5, vacuum cooling to obtain a tantalum oxide thin film formed on the substrate. The tantalum oxide thin film prepared by this invention has an extinction coefficient k ≤ 5×10⁻⁶ in the 1550nm band, which is about two orders of magnitude lower than that of the prior art (k≈10⁻⁴). This invention does not require an ion source and can be achieved using only mid-frequency magnetron sputtering, resulting in low equipment requirements and significant cost advantages. A 100G DWDM filter made using the thin film prepared by this invention has an insertion loss ≤0.1 dB, which is better than the 0.2 dB of the prior art.

The invention provides a ferroelectric capacitor, a manufacturing method thereof and a ferroelectric random access memory. The ferroelectric capacitor comprises a substrate, a bottom electrode, a bottom insertion layer, a ferroelectric film layer and a top electrode which are sequentially arranged from bottom to top, the bottom insertion layer includes a niobium oxide layer, a tantalum oxide layer, or a stack of a niobium oxide layer and a tantalum oxide layer. By adding the bottom insertion layer made of niobium oxide or tantalum oxide materials, interface asymmetry is introduced, local enrichment of oxygen vacancies is caused, domain wall pinning sites are further formed, an internal bias field is caused, and therefore a large capacitance storage window is achieved, non-destructive reading can be conducted, decoupling of read-write durability is achieved, and the read-write performance is improved. And the device has low leakage current and high durability, and the problem of how to improve the device performance of the ferroelectric random access memory is solved.

A method for efficiently recovering iridium from organic coating liquids involves first mixing the coating liquid with an alkaline solution, stirring and reacting at room temperature, followed by solid-liquid separation. The solid is dried and dehydrated for later use, while the liquid is the supernatant. The supernatant is heated, and an alkaline solution is added and stirred to react. After sufficient settling, solid-liquid separation is performed again. The solid is dried and dehydrated, then ground together with the previously dried and dehydrated solid into powder. The powder is then calcined in a muffle furnace to obtain iridium and tantalum oxide powders. HF is added to the oxide powders to remove impurities such as Ta2O5, and solid-liquid separation is performed again. The solid is washed with water until neutral, dried and dehydrated, dissolved in aqua regia, and concentrated by heating to obtain chloroiridium acid. The method provided by this invention has a simple synthesis process, the supernatant after precipitation is free of iridium, the iridium loss rate is low, effectively reducing iridium loss in the organic liquid evaporation and concentration steps, and the HF removes tantalum, allowing direct dissolution of IrO2 in aqua regia, improving efficiency and reducing iridium loss during the process.