9 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 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.

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 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 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 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.