25 results about "Lanthanum titanate" patented technology

The invention belongs to the technical field of special ceramic preparation, and particularly relates to high-strength special ceramic and a preparation method thereof. The high-strength special ceramic is prepared from the following raw materials: alumina powder, quartz powder, serpentine, phosphorus slag, eucryptite, barium borate, nano yttrium trifluoride, nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane. According to the high-strength special ceramic disclosed by the invention, the aluminum oxide powder, the quartz powder, the serpentine and the phosphorus slag are taken as matrix raw materials, eucryptite, barium borate and yttrium trifluoride are taken as fluxing agents, and nano hafnium boride, nano strontium zirconate, nano lanthanum titanate and polyborosilazane are taken as fillers, so that the prepared special ceramic has excellent bending strength and fracture toughness.

The invention discloses a temperature-stable multiphase ceramic material for a high-temperature capacitor and a preparation method of the temperature-stable multiphase ceramic material. The method comprises the following steps: weighing Na < 0.465 > Li < 0.07 > Bi < 0.465 > Ta < 0.07 > Ti < 0.93 > O < 3-x > BaLa < 2 > Ti < 4 > O < 12 > according to a stoichiometric formula (1-x) Na < 0.465 > Li < 0.07 > Bi < 0.465 > Ta < 0.07 > Ti < 0.93 > O < 3-x > BaLa < 2 > Ti < 4 > O < 12 >, x is greater than or equal to 0.01 and less than or equal to 0.05, and uniformly mixing to form a full ingredient; carrying out ball milling, drying and sieving on the full ingredients to form sieved materials; and pressing the sieved material into a green body, and sintering the green body to obtain the temperature-stable composite ceramic. The problems that an existing NBT-based ceramic material is large in leakage current, low in breakdown field strength and low in efficiency at the high temperature are solved. According to the ceramic material prepared by the method, the low-loss microwave dielectric ceramic material barium lanthanum titanate is introduced, oxygen vacancies generated by volatilization of Na < + > and Bi < 3 + > in the sintering process are compensated, stable charge accumulation is formed at the interface of the ceramic material and a main phase, ion migration activation energy at a grain boundary is reduced, and the performance of the ceramic material is improved. The change of the dielectric loss tangent value tan delta along with the temperature tends to be gentle, the polarization response of the ferroelectric domain is further inhibited, and the dielectric property is stabilized.

The invention relates to the technical field of lithium battery positive electrode materials, in particular to a lithium lanthanum titanate epitaxial growth and titanium / lanthanum doping regenerated waste lithium cobalt oxide positive electrode material and a preparation method thereof.La3 + and Ti4 + gradient doping layers are arranged in regenerated lithium cobalt oxide particles, and the regenerated lithium cobalt oxide particles are formed through a three-dimensional crack network of waste lithium cobalt oxide; a Li < 3x > La < 2 / 3-x > TiO3 coating layer is epitaxially grown on the surface of the particle; the gradient doping layer broadens a lithium ion transmission channel, and the Li3xLa2 / 3-xTiO3 coating layer is used as a fast ion channel. According to the invention, a sol-gel method is used, a lithium source, a titanium source and a lanthanum source are uniformly attached to the surface of a material, and then high-temperature sintering is carried out, so that epitaxial growth of Li3xLa2 / 3-xTiO3 and gradient doping of La3 + / Ti4 + are realized while material structure repair is completed. A three-dimensional fast ion channel is provided for the deintercalation and intercalation of Li < + >, and the regenerated lithium cobalt oxide positive electrode material with excellent electrochemical performance is obtained.

The invention discloses a bio-based degradable wrapping film and a preparation method thereof in the field of green logistics and environment-friendly packaging. The wrapping film is prepared from polylactic acid, poly (butylene succinate), triethyl citrate, an antioxidant, calcium stearate and two novel inorganic modified compounds. Wherein the zirconium phosphate-sodium carboxymethyl cellulose intercalation compound constructs an organic-inorganic hybrid structure through alkaline intercalation, so that the dispersity and interfacial compatibility of the filler are effectively improved; the lanthanum titanate-zinc oxide core-shell nano hybrid is prepared by combining a solvothermal method with a urea precipitation process, has regular core-shell morphology, can synergistically enhance mechanical properties, regulate and control degradation rate, and endows antibacterial and ultraviolet shielding functions. The wrapping film prepared by melt blending and film blowing processes has high tensile strength, excellent ductility, good transparency and controllable compost degradability.

The present invention belongs to the technical field of lithium-ion solid-state batteries, and discloses a high-ionic conductivity lanthanum titanate lithium solid electrolyte material and its preparation and application. The preparation method of the high-ionic conductivity lanthanum titanate lithium solid electrolyte material is to use a lithium source, a titanium source and a lanthanum source as precursors, and prepare them into lanthanum titanate lithium solid ceramic sheets through ball milling mixing, drying, pre-burning, ball milling crushing, drying, granulation, tableting, sintering and other processes, and then perform a high-temperature quenching process to obtain a high-ionic conductivity lanthanum titanate lithium solid electrolyte material. The present invention adopts a solid electrolyte preparation process of first sintering and then quenching treatment, which can effectively reduce the grain boundary impedance of lanthanum titanate lithium ceramics, thereby improving the ionic conductivity of lanthanum titanate lithium ceramic solid electrolytes to 10 ‑4 ~10 ‑3 On the other hand, the process is simple and easy to control, which can effectively ensure that the ceramic reduces the grain boundary resistance with significant results.

A glass includes a composition characterized by the following constituent phases (in mol-%): 20-80 lanthanum titanate; 10-50 lanthanum niobate; 0-60 lanthanum molybdenum borate; 2-40 lanthanum borate; 2-40 yttrium borate; 0-40 gadolinium borate; 2-40 zirconium silicate; 2-40 diboron trioxide; and 0-20 silicon dioxide. A refractive index is at least 2.00.

The utility model provides an optical lens of a telescope objective lens, which is characterized in that a body adopts a ZK9 material as a base material for processing, the body is sequentially provided with an eighth film layer, a seventh film layer, a sixth film layer, a fifth film layer, a fourth film layer, a third film layer, a second film layer and a first film layer from left to right, and the eighth film layer is made of silicon dioxide with the thickness of 54.75 nm. The seventh film layer is made of zirconium dioxide with the thickness of 92.65 nm, the sixth film layer is made of aluminum oxide with the thickness of 191.48 nm, the fifth film layer is made of lanthanum titanate with the thickness of 85.32 nm, the fourth film layer is made of magnesium fluoride with the thickness of 113.41 nm, the third film layer is made of aluminum oxide with the thickness of 150.38 nm, the second film layer is made of magnesium fluoride with the thickness of 85.05 nm, the first film layer is made of zirconium dioxide with the thickness of 28.52 nm, the refractive index is 1.62, and the transmittance is 8.0%.

The present invention provides a lithium cerium lanthanum titanate ceramic with high-voltage electrical properties and a preparation method thereof, relating to the technical field of piezoelectric ceramic materials. The general formula of the lithium cerium lanthanum titanate ceramic of the present invention is La 2‑x (LiCe) x / 2 Ti2O7, wherein 0 < x ≤ 0.08. By doping Li / Ce doubly at the A-site in an appropriate amount, the long-range order and ferroelectric order of the crystal lattice are destroyed in the present invention. This local inhomogeneity enables the piezoelectric ceramic to maintain an ultra-high Curie temperature T C and resistivity, and at the same time, it also has high piezoelectric properties.

The invention belongs to the technical field of ceramic grinding body preparation, and particularly relates to a ceramic grinding body and a preparation method thereof. The ceramic grinding body is prepared from the following raw materials: calcined aluminum oxide, high-silicon tailings, calcite, zinc-aluminum composite sol, magnesium-aluminum composite sol, lithium tailings, szaibelyite, cerium hexaboride, lanthanum titanate and yttrium aluminum garnet nano powder. According to the ceramic grinding body, the calcined aluminum oxide, the high-silicon tailings, the zinc-aluminum composite sol and the magnesium-aluminum composite sol serve as main raw materials, mullite, magnesium aluminate spinel and a zinc aluminate spinel composite phase are generated through sintering, and the mechanical strength of the prepared ceramic grinding body is fundamentally ensured. The lithium tailings, calcite and szaibelyite are used as sintering aids to reduce the sintering temperature and improve the compactness of the ceramic grinding body, and cerium hexaboride, lanthanum titanate and yttrium aluminum garnet nano powder are used as fillers to further enhance the wear resistance of the prepared ceramic grinding body.

The utility model discloses an anti-blue fog coated lens, which comprises a substrate, the surface of the substrate is sequentially coated with a # imgabs 0 # film layer, a magnesium fluoride film layer, a lanthanum titanate film layer and an anti-fog film layer from inside to outside, the anti-fog film layer is made of fluoride film materials, and the # imgabs 1 # film layer and the anti-fog film layer form a functional film layer capable of preventing blue fog from being generated on the surface of the lens. According to the coated lens, the # imgabs2 film layer is used as a bottoming film layer, and the compactness between the film layers is improved by utilizing the good chemical bonding basis of the # imgabs2 film layer, so that blue fog on the surface of the lens can be prevented; the anti-fog film layer made of fluoride not only plays a role in plastic packaging, but also has excellent water resistance and oil resistance, and can effectively prevent blue fog from being generated on the surface of the lens in a high-temperature and high-humidity environment.

The present application relates to a kind of low dielectric loss and low temperature coefficient microwave dielectric ceramic and its preparation method, the preparation method includes the following steps: after mixing zinc lanthanum titanate, strontium source and auxiliary raw material, sequentially forming and sintering, the low dielectric loss and low temperature coefficient microwave dielectric ceramic is prepared;The auxiliary raw material includes any one or combination of at least two of calcium carbonate, manganese dioxide or barium carbonate.The present application selects zinc lanthanum titanate and strontium titanate with good microwave dielectric properties as basic raw material to ensure the basic performance of ceramic;Introduce appropriate amount of calcium carbonate, manganese dioxide and barium carbonate, effectively reduce the dielectric loss of ceramic, and improve its temperature characteristics;The present application reduces production cost and technical difficulty by solid phase reaction method, while ensuring the uniformity and stability of ceramic, effectively reduces the dielectric loss of microwave dielectric ceramic, and improves its temperature characteristics, further improves the performance of ceramic.

The invention provides an ultrahigh-nickel ternary positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: providing a precursor material which is nickel-cobalt-manganese hydroxide with a nickel molar ratio of 90% or more; the precursor material is subjected to wet doping, doping elements comprise Sr and La, and a first intermediate material is obtained; mixing the first intermediate material with a lithium source, and performing first sintering to obtain a second intermediate material; carrying out wet coating on the second intermediate material by using a first coating material, and carrying out second sintering to form a third intermediate material, the first coating material comprising lithium lanthanum titanate and Li3PO4; and coating the third intermediate material with a second coating material, and performing third sintering to obtain the ultrahigh-nickel ternary positive electrode material, the second coating material comprising boric acid and / or boron oxide. The ultrahigh-nickel ternary positive electrode material prepared by the invention has excellent structural stability, shows good material conductivity and relatively high cyclicity, and has good electrical performance.

The present invention discloses a sodium-doped lanthanum titanate / borate composite catalytic material and its preparation method and application. The sodium-doped lanthanum titanate / borate composite catalytic material is La 1.33‑x Na 3x Ti2O6 / Na3La2(BO3)3 composite material, the La 1.33‑x Na 3x In the Ti2O6 / Na3La2(BO3)3 composite material, the molar fraction of Na3La2(BO3)3 is 35% to 75%; the La 1.33‑x Na 3x In Ti2O6, 3x is 0.16 to 0.54. It is prepared by uniformly mixing lamellar lanthanum titanate and sodium borohydride in a specific mass ratio, followed by annealing in an inert atmosphere. This composite catalytic material exhibits excellent interfacial contact, effectively improving carrier separation and migration efficiency, accelerating electron transfer, and exhibiting excellent photocatalytic performance.

The present application relates to the technical field of capacitor manufacturing, and discloses a kind of MLCC electrode nickel paste sintering shrinkage and BaTiO3 ceramic medium matching regulation and control method, comprising the following steps: S1: the conductive ceramic shrinkage inhibitor powder, dispersing agent and organic carrier are ball milled to obtain pre-dispersion, the conductive ceramic is selected from at least one of titanium nitride, titanium carbide, calcium copper titanate, lanthanum titanate or lanthanum strontium manganese oxide;S2: nickel powder is heat treated in H2 / N2 mixed atmosphere to obtain surface-activated nickel powder;S3: pre-dispersion, surface-activated nickel powder, dispersing agent, organic carrier and additives are mixed to form paste;S4: grinding dispersion to fineness≤5 μm.The present application replaces insulating oxide with conductive ceramic, combines nickel powder activation and contains heat preservation platform's step temperature rise, constructs conductive rigid skeleton, realizes shrinkage matching, gives consideration to electrode conductivity and interface bonding force, solves the problem that shrinkage matching and conductive performance are difficult to give consideration to.

The invention belongs to the technical field of semiconductors, and relates to a photoelectric synapse device based on an LLTO ion gate, which comprises a substrate, a bottom electrode, a gate medium, a channel, a source electrode and a drain electrode, the gate medium is made of lithium lanthanum titanate, and the channel is made of a two-dimensional semiconductor film. The photoelectric synapse device has the characteristic that volatile synapse and non-volatile synapse are adjustable, has a large storage window, a high switch ratio, anticlockwise transfer curve hysteresis, quick response and excellent stability, has synapse response to electricity and optics, can perform low-power-consumption operation, and has a wide application prospect. The method is one of ideal candidate device systems for advanced electronic devices and neuromorphic calculation in the future.

This invention discloses a homogeneous corundum mullite brick and its preparation process, belonging to the field of refractory materials technology. The process employs a sol-gel assisted microscopic in-situ homogenization method: a precursor sol film is formed on the submicron-level bauxite surface by constructing a homogeneous lanthanum ion solution and performing colloidal-level contact grinding; a salt bridge network is formed by spray drying and granulation; finally, sintering is carried out under an oxidizing atmosphere, inducing lanthanum ions to preferentially react with impurities to generate high-melting-point lanthanum ferrite or lanthanum titanate-like crystalline phases. This process blocks impurities from participating in the formation of low-melting-point glass phases at the microscopic scale, resulting in clean grain boundaries within the brick and the absence of continuous glass phases. The obtained product exhibits a high-temperature creep rate of less than [value missing] and a load softening temperature of [value missing], achieving a breakthrough in the preparation of high-end refractory materials using low-grade raw materials.

The utility model provides a lanthanum titanate coating material mixing and stirring device, and relates to the technical field of lanthanum titanate coating materials, the lanthanum titanate coating material mixing and stirring device comprises a transversely arranged cylinder body and a bracket for supporting the cylinder body, the cylinder body transversely rotates relative to the bracket, a plurality of steel balls are placed in the cylinder body, and the steel balls can rotate along with the cylinder body and freely fall in the cylinder body. According to the utility model, the rotation of the barrel body can collide the materials at the bottom through the free falling body of the steel balls while mixing the materials, so that the powder can be prevented from caking, and the mesh barrel can be matched with the steel balls to generate vibration, so that the phenomenon of powder caking can be further prevented.

The application relates to a plasticity-enhanced lead lanthanum zirconate titanate stannate-based antiferroelectric ceramic and a preparation method thereof. The chemical formula of the lead lanthanum zirconate titanate stannate-based antiferroelectric ceramic is (Pb 0.975‑x La 0.02 Sr x )(Zr 0.5 Sn 0.37 Ti 0.13 ) 0.9975 O3, wherein 0 < x <= 0.10; the plasticity-enhanced lead lanthanum zirconate titanate stannate-based antiferroelectric ceramic is prepared by adopting a flash sintering technology; wherein, the initial electric field intensity is 100-300 V / cm, the heating rate of a flash sintering furnace body is 5-15 DEG C / min; when the current detection meter reading reaches the order of muA, the electric field intensity is increased to 200-500 V / cm; when the current density value reaches 10-30 mA / mm 2 After 90-200 s of stable current density, the heating rate of the flash sintering furnace body is preferably 8-12 DEG C / min.

The present invention provides an inorganic / polymer composite solid electrolyte and its application, which includes a framework material that plays a role in fast ion conduction and a toughening material filled in the framework material. The framework material is selected from garnet-type solid electrolyte lithium lanthanum zirconium oxide and perovskite-type solid electrolyte lithium lanthanum titanate. Due to the combination of the high modulus of the inorganic framework and the high toughness of the polymer, this composite solid electrolyte has good mechanical properties, and successfully solves the problem that lithium dendrites pierce the electrolyte and cause battery short circuit. The introduction of the polymer greatly improves the brittleness of the inorganic framework, and at the same time solves the problem of high interfacial impedance caused by poor contact between the inorganic ceramic fibers and the positive and negative electrodes. Finally, the use of this electrolyte improves the safety performance and service performance of lithium metal batteries.

The invention discloses a preparation method of a cobalt-doped lanthanum titanate perovskite material and application of the cobalt-doped lanthanum titanate perovskite material in removal of sulfamethoxazole in water, and relates to the technical field of treatment of sulfamethoxazole in wastewater. The preparation method comprises the following steps: ultrasonically mixing titanium inorganic salt, lanthanum inorganic salt and cobalt inorganic salt to obtain a mixed solution, adding a sodium hydroxide solution, fully stirring, transferring into a high-pressure reaction kettle, and carrying out hydrothermal reaction. By controlling the molar ratio of the cobalt inorganic salt to the lanthanum inorganic salt, lanthanum titanate perovskite materials (Co / LTO) with different cobalt doping amounts can be obtained. Under the condition that the prepared cobalt-doped lanthanum titanate perovskite material is combined with peroxymonosulfate, efficient removal of sulfamethoxazole in water is achieved, the method has the advantages that the removal effect is slightly affected by the pH value, various inorganic anions, humic acid and other factors, and the material can be reused after being recycled and washed.

The invention belongs to the technical field of dielectric materials, and discloses low-temperature sintered zirconium tin hafnium lanthanum lead titanate antiferroelectric ceramic as well as a preparation method and application thereof. The method comprises the following steps: ball-milling and mixing PbO, La2O3, ZrO2, HfO2, SnO2 and TiO2, drying, grinding, sieving, pre-sintering at 850-950 DEG C to obtain ceramic powder, ball-milling and mixing the ceramic powder and glass, drying, grinding, sieving and drying to obtain glass-containing ceramic powder, adding a plasticizer into the ceramic powder, grinding, pressing into a green body, discharging glue under vacuum and isostatic cool pressing, and sintering at 910-960 DEG C to obtain the glass-containing ceramic powder. The glass-doped zirconium tin hafnium lanthanum titanate lead ceramic is prepared. The sintering temperature of the zirconium tin hafnium lanthanum lead titanate ceramic can be reduced to 930 DEG C from about 1170 DEG C by doping the glass phase, and the glass-doped anti-ferroelectric ceramic has high energy storage density and energy storage efficiency and can be applied to pulse power devices.

The invention provides a battery, the battery comprises a positive plate, a negative plate and a diaphragm, the positive plate comprises a positive current collector and a positive coating arranged on at least one side surface of the positive current collector, the positive coating comprises a positive active material and a solid electrolyte, the positive active material comprises a manganese element, the solid electrolyte comprises a titanium element, and the titanium element is a titanium element. The solid electrolyte comprises lithium titanium aluminum phosphate and / or lithium lanthanum titanate; based on the mass of the positive electrode coating, the weight ratio of the manganese element to the titanium element is (5-150): 1; the negative plate comprises a negative current collector and a negative coating arranged on the surface of at least one side of the negative current collector, the negative coating comprises a negative active substance, the negative active substance comprises graphite, the average particle size of the graphite is f [mu] m, the OI value of the negative plate is g, and f / g is larger than or equal to 0.06 and smaller than or equal to 1.5. The battery provided by the invention has excellent high / low temperature stability.

The invention relates to the technical field of ultra-high-temperature piezoelectric ceramic materials, in particular to a method for improving the piezoelectric property of a lanthanum titanate (La2Ti2O7, called LTO for short)-based ceramic material, and the method is mainly characterized in that the LTO-based piezoelectric ceramic material is prepared by a preparation method of combining cold isostatic pressing and two-time solid-phase reaction sintering. Then, the prepared ceramic material is polarized through a stepped step-by-step polarization method; the piezoelectric property of the LTO-based ceramic material can be improved only by improving the preparation process and the polarization method, the method is simple in preparation process, the polarization method is easy to popularize, industrial large-scale production is facilitated, a simple, convenient and low-cost solution is provided for application of LTO in an extreme environment, and the method is suitable for industrial production. The method can be widely applied to the field of ultrahigh-temperature piezoelectric sensors.

The application discloses nitrogen-doped lanthanum titanate nanosheets and a preparation method and application thereof, and particularly discloses that a simple hydrothermal reaction is carried out by using lanthanum nitrate hexahydrate, titanium sulfate and sodium hydroxide to prepare nitrogen-doped lanthanum titanate nanosheets, and the nitrogen-doped lanthanum titanate nanosheets are used as a catalyst and are used in a photocatalytic reduction of carbon dioxide reaction. Compared with undoped lanthanum titanate nanosheets, the nitrogen-doped lanthanum titanate nanosheets have more excellent selectivity of photocatalytic reduction of carbon dioxide (CO2) to CH4. The prepared nitrogen-doped lanthanum titanate (La2Ti2O7) nanosheets can reduce the photocatalytic CO2 to carbon monoxide (CO) and methane (CH4) under normal temperature and pressure, and the CH4 generation rate is about 35.6 μmol g ‑1 h ‑1 , and the product selectivity and electron selectivity of CH4 are about 87.65% and 97.70%.

The application belongs to the technical field of electrochemistry, and provides a safety coating material for a positive electrode sheet and a preparation method and application thereof.The safety coating material for the positive electrode sheet comprises the following components in mass fraction: 70-95 parts of carbon-coated solid electrolyte, 1.5-15 parts of a binder, 0.1-5 parts of a surfactant, 0.1-5 parts of a dispersant, and 150-400 parts of a solvent; the solid electrolyte in the carbon-coated solid electrolyte comprises one or more of lithium aluminum titanium phosphate, lithium lanthanum titanium-oxygen lanthanum titanate and lithium lanthanum zirconium-oxygen lanthanum zirconate; the mass percentage of carbon to the solid electrolyte in the carbon-coated solid electrolyte is 0.5-900:0.5-900; and the thickness of the carbon coating layer in the carbon-coated solid electrolyte is 0.5-20 nm.The safety coating material improves the safety performance, energy density and electrochemical performance of a lithium ion battery, and has a very wide application prospect.