361 results about "Lead titanate" patented technology

A method and apparatus for non-invasive measurement of living body information comprises a light source configured to generate light containing a specific wavelength component, an irradiation unit configured to irradiate a subject with the light, and at least one acoustic signal detection unit including piezoelectric devices formed of a piezoelectric single crystal containing lead titanate and configured to detect an acoustic signal which is generated due to the energy of the irradiation light absorbed by a specific substance present in or on a subject.

A nitrogen oxide storage material is disclosed which contains at least one storage component for nitrogen oxides in the form of an oxide, mixed oxide, carbonate or hydroxide of the alkaline earth metals magnesium, calcium, strontium and barium and the alkali metals potassium and caesium on a high surface area support material. The support material can be doped cerium oxide, cerium/zirconium mixed oxide, calcium titanate, strontium titanate, barium titanate, barium stannate, barium zirconate, magnesium oxide, lanthanum oxide, praseodymium oxide, samarium oxide, neodymium oxide, yttrium oxide, zirconium silicate, yttrium barium cuprate, lead titanate, tin titanate, bismuth titanate, lanthanum cobaltate, lanthanum manganate and barium cuprate or mixtures thereof.

The invention discloses a bismuth scandate-lead titanate high-temperature piezoelectric ceramic material. The bismuth scandate-lead titanate high-temperature piezoelectric ceramic material comprises a matrix with the chemical formula of xBiScO3-(1-x)PbTiO3 and bismuth trioxide (Bi2O3) in an amount which is less than 0.4 percent of the total weight of the matrix. The bismuth scandate-lead titanate high-temperature piezoelectric ceramic material is prepared by adding excess Bi2O3 into raw materials of Sc2O3, Bi2O3, Pb3O4 and TiO2 in the metering ratio according to the chemical formula of xBiScO3-(1-x)PbTiO3, wherein x is 0.35 to 0.38; and the using amount of the excess Bi2O3 is 0.1 to 0.4 percent of the total weight of the raw materials of Sc2O3, Bi2O3, Pb3O4 and TiO2 in the metering ratio according to the chemical formula of xBiScO3-(1-x)PbTiO3. The bismuth scandate-lead titanate high-temperature piezoelectric ceramic material solves the problems that ceramic sintering temperature is increased and piezoelectric and dielectric properties are reduced due to deviation of a stoichiometric ratio caused by bismuth volatilization in the sintering process of BSPT ceramic, and has high Curie temperature, excellent piezoelectric property and an actual application value in high-temperature electronic equipment. The invention also discloses a preparation method for the bismuth scandate-lead titanate high-temperature piezoelectric ceramic material. In the preparation method, the piezoelectric ceramic material is prepared by synthesizing and sintering at lower temperature, so production cost is reduced, process steps are simplified, and the material has actual application value.

The invention relates to a method for preparing a perovskite structure lead titanate monocrystal nano rod. A titanium and lead oxyhydroxide mixed sediment for hydrothermal reaction is prepared by a two-step precipitation method. The method comprises the following steps: taking titanium sulfate as a raw material for precipitating titanium, taking lead nitrate as a raw material for precipitating lead and taking potassium hydroxide as a precipitating agent; precipitating titanium ions; precipitating lead ions; after the product is filtered and washed, obtaining the mixed sediment containing the titanium ions and the lead ions; mixing and dispersing the mixed sediment and the potassium hydroxide in deionized water; sealing the mixture in a reaction kettle; and carrying out hydro-thermal treatment at 160-240 DEG C for 5-48 hours to obtain the perovskite structure lead titanate monocrystal nano rod. The invention has simple technology process, no pollution and low cost and is easy to control and carry out mass production.

The invention relates to a ferroelectric piezoelectric ceramic with the characteristic of low sintering temperature. The compositions are (1-x-y)PbZrO3-xPbTiO3-yBi(Zn1/2Ti1/2)O3 and z weight percent of MnO2, wherein x is equal to between 0.30 and 0.50, y is equal to between 0.05 and 0.25, and z is equal to between 0.0 and 0.5. Oxide materials and the prior solid-state reaction electronic ceramic process are adopted to achieve the aim of sintering a compact piezoelectric ceramic chip at a low temperature between 900 and 1,000 DEG C. The PbZrO3-PbTiO3-Bi(Zn1/2Ti1/2)O3 ferroelectric piezoelectric ceramic is a single phase perovskite structure and has a 'hard' piezoelectric property. Presintering powder of the PbZrO3-PbTiO3-Bi(Zn1/2Ti1/2)O3 ferroelectric ceramic powder as a sintering auxiliary, and an electronic ceramic process of solid phase reaction are adopted so as to achieve the low temperature sintering of the strontium-doped lead zirconate titanate at a temperature of 1,050 DEG C as well as the modification of the piezoelectric property. The ferroelectric piezoelectric ceramic is particularly applicable to the manufactures of functional devices such as emission piezoelectric ceramic devices, low-temperature cofiring multi-layer ceramic piezoelectric drives, transformers, and transducers.

The invention relates to a method for preparing a lead titanate nano column automatically assembled by perovskite structure nano pieces. A titanium and lead oxyhydroxide mixed sediment for hydrothermal reaction is prepared by a two-step precipitation method. The method comprises the following steps: hydrolyzing tetrabutyl titanate by ammonia solution to precipitate titanium ions; introducing lead nitrate in the ammonia solution suspended with a titanium oxyhydroxide sediment to precipitate lead ions; after the mixed sediment is filtered and washed, mixing the mixed sediment, potassium hydroxide and deionized water; and carrying out hydro-thermal treatment in a sealed reaction kettle at 160-240 DEG C for 5-48 hours to obtain the lead titanate nano column automatically assembled by the perovskite structure lead titanate nano pieces. The lead titanate nano column is 5-20 microns in length and 0.4-1 micron in diameter, and the perovskite structure lead titanate nano pieces of the lead titanate nano column are 2-10 microns in thickness. The invention has simple technology process, no pollution as well as low cost and is easy to control and carry out mass production.

The invention discloses a lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic material and a preparation method thereof, wherein the composition of the material is (Pb1-XLax)(Zr1-YTiy)zO3, x is 0.03-0.15, y is 0.05-0.50, and z is 0.50-1.00. According to the present invention, lanthanum-zirconium-doped lead titanate powder is synthesized from raw materials such as PbO, La2O3, ZrO2 and TiO2 according to a solid-phase reaction method, a raw film is prepared through a casting molding process, and the raw film is subjected to glue removing sintering to obtain the lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic; and the thickness of the prepared PLZT thick film ceramic is 20-70 [mu]m, the prepared lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic has the properties of the relaxation type ferroelectric material, can bear the high electric field strength, has the excellent electrothermal effect, and can meet the electrothermal refrigeration device preparation requirements.

The composite material has the material composition including polyvinylidene fluoride (PVDF) 20-30 wt%, Terfenol-D 2-12 wt% and plumbum zirconate titanate (PZT) the rest, and is prepared through the steps of: weighing the material, PVDF, PZT and Terfenol-D; pressing tablet, lamination or painting to produce sheet, plating gold or silver electrode, and final polarization at 4000-5000 v voltage. The magnetoelectric composite material is easy to form and convenient in use.

The invention discloses a novel growth technology of relaxation ferroelectric mono-crystal PIMNT by using a Bridgman-Stockbarger method, belonging to the technical field of mono-crystal growth. The novel growth technology of the relaxation ferroelectric mono-crystal PIMNT comprises the steps of: regarding high-purity PbO, Nb2O5, In2O3, TiO2 and 4MgCO3.Mg(OH)2.4H2O as initial raw materials to prepare a PIMNT polycrystal material through a precursor step-by-step synthesis method, wherein the chemical constitution is xPb(In1/2Nb1/2)O3-yPb(Mg1/2Nb2/3)O3-(1-x-y)PbTiO3, where x=0.24-0.26, and y=0.43-0.45; selecting high-quality seed crystal in a [110], [111] or [001] crystallographic direction; adopting a single-layer or double-layer seamless platinum crucible to contain the seed crystal and a material ingot; putting the crucible after being sealed in a mono-crystal growth furnace; controlling the temperature of the furnace at 1350-1400 DEG C; adjusting the position of the crucible to enable the material ingot to be welded with the top part of the seed crystal so as to form a steady solid-liquid interface with a temperature gradient of 20-50 DEG C; and growing the mono-crystal at a dropping speed of the crucible of less than 1 mm/h to obtain a high-quality and large-size PIMNT mono-crystal. The novel growth technology of the relaxation ferroelectric mono-crystal PIMNT, disclosed by the invention, has the advantages of overcoming a leakage phenomenon of a high-temperature lead-rich melt, avoiding volatilization of components of the melt, and particularly lead oxide steam, efficiently solving a poly-crystallized growth problem of a solid solution with composition complexity, and being suitable for growing high-quality and large-size PIMNT mono-crystals in batches.

A melt method for growing the sosoloid monocrystal of lead lead-titanate niobium-zincate, (1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 where x=0.05-0.2, features that the raw material is pretreated by two steps andther PZNT monocrystal is grown by heterosyntectonic crucible lowering method, where PMNT sosoloid monocrystal is used as seed, temp is 1380-1420 deg.C, the temp gradient at growth interface is 40-80 deg.C and lowering speed is 0.5-1 mm/hr.

The invention discloses a titanium dioxide/lead titanate compounded nanometer photocatalyst and a preparation method thereof. The titanium dioxide/lead titanate compounded nanometer photocatalyst is a heterogeneous structure material formed by distributing titanium dioxide nano particles on the surface of lead titanate nano sheets. The preparation method comprises the following steps of dispersing lead titanate nano sheets synthetized through a hydrothermal method into deionized water; preparing a titanium source water solution; and dropwise adding the titanium source water solution into the lead titanate nano sheet water solution, then transferring into a hydrothermal reaction kettle, after hydrothermal reaction, cooling to room temperature, filtering, washing, and drying. The preparation method is simple and easy to control, and has low requirement on equipment; and the prepared titanium dioxide/lead titanate compounded nanometer photocatalyst can be used for regulating the ultraviolet light catalysis of the titanium dioxide into visible light catalysis.

The invention provides a touch panel and a manufacturing method thereof. The touch panel is composed of a plurality of basic sensing units which are arranged in an array mode. Each basic sensing unit comprises a pressure sensing transistor and a selecting transistor. Each pressure sensing transistor comprises a first electrode, a second electrode, a grid electrode, a light shading layer, a channel connected with the first electrode and the second electrode, an insulation layer formed on the channel, and a piezoelectric material formed on the insulation layer, wherein the piezoelectric material comprises polyvinylidene fluoride, lead titanate zirconium, zinc oxide, barium titanate, lithium niobate and lead titanate. Each selecting transistor comprises a first electrode, a second electrode and a third electrode, wherein the first electrode of each selecting transistor can be connected with a sensing electrode of the touch panel, the second electrode of each selecting transistor can be connected with the first transistor of the corresponding pressure sensing transistor, and the third electrode of each selecting transistor is a grid electrode and can be connected with a drive electrode of the touch panel.

The invention relates to a process for preparing piezoelectric material with three-layer structure of quartz/lanthanum nickelate/bismuth ferric-lead titanate, belonging to the technical field of inorganic piezoelectric material preparation process. The invention coats a bismuth ferric-lead titanate film on a quartz glass substrate through the sol-gel process, and introduces a lanthanum nickelate layer between the quartz glass substrate and the bismuth ferric-lead titanate film as a bottom electrode, thereby realizing the double gains and characterization of the optical and electrical performances of the bismuth ferric-lead titanate film on the quartz glass substrate. Piezoelectric material with SiO2/LaNiO3/BiFeO3-PbTiO3 three-layer structure which is prepared by the invention has excellent optical and electric performances, and can be used as memory storage materials and sensitized component materials.

The invention relates to a preparation method of a perovskite phase lead titanate-strontium titanate monocrystal nanometer material with a core-shell structure. The preparation method comprises the steps of taking a monocrystal single-domain perovskite phase lead titanate nanosheet as a template and a raw material, taking tetrabutyl titanate as a titanium source, taking strontium nitrate as a strontium source, taking sodium hydroxide as a precipitant and a mineralizing agent, and preparing precursor mixed turbid liquid for a hydrothermal reaction under the condition of magnetic stirring; sealing the precursor mixed turbid liquid into a stainless steel reaction still having a teflon liner, and obtaining a core-shell structure perovskite phase lead titanate-strontium titanate monocrystal nanometer composite structure through subjecting to hydro-thermal treatment at the temperature of 160 to 220 DEG C for 4 to 24 hours. The preparation method provided by the invention is simple in technical process, easy to control, free of pollution, low in cost, and easy for mass production. The prepared perovskite phase lead titanate-strontium titanate monocrystal nanometer composite structure has a clear core-shell structure, and has an interface with atomic resolution.

The invention relates to a carbon nano tube/lead zirconate titanate/cement piezoelectric composite material for a civil engineering sensor and a preparation method thereof. The piezoelectric composite material consists of the carbon nano tube, the lead zirconate titanate and cement. The preparation method comprises the following steps: evenly mixing the carbon nano tube, lead zirconate titanate powder and cement powder; shaping the mixture with water; and hydrating and drying the mixture. The material can be used for preparing the civil engineering sensor after polarizing and aging. The piezoelectric composite material has excellent piezoelectric responsivity.

The invention discloses a lithium-sulfur battery composite positive electrode material. Graphene oxide is used as a matrix of the battery positive electrode material, a graphene/ferroelectric composite material is obtained after the graphene oxide and a ferroelectric material are compounded, and then the graphene/ferroelectric composite material is mixed with nano sulfur according to a mass ratio of 3:7 to prepare the lithium-sulfur battery composite positive electrode material; and the ferroelectric material is one of barium titanate, lead titanate, potassium niobate, strontium titanate, lithium niobate or lead zirconate titanate. According to the lithium-sulfur battery composite positive electrode material disclosed by the invention, excellent electrical conductivity and structural stability of the graphene oxide are utilized, and the graphene oxide is used as an excellent conductive network and the positive electrode matrix, so that electrical conductivity of the positive electrode material is improved; and by utilizing strong adsorption of ferroelectricity of the ferroelectric material on polar polysulfide, dissolution and shuttling of the polysulfide in electrolyte are inhibited, so that loss of active substances is reduced, coulombic efficiency of a lithium-sulfur battery is improved and a cycle life of the lithium-sulfur battery is prolonged.

The invention relates to a perovskite structure lead titanate single crystal nano-sheet preparation method, which is mainly characterized by comprising: adopting a two-step hydrothermal method, adopting tetrabutyl titanate as a precursor to dissolve in anhydrous ethanol, adding deionized water in a dropwise manner to prepare titanium oxyhydroxide precipitate, washing, mixing with KOH, carrying out a hydrothermal treatment to prepare K2Ti6O13 nano-wire powder, adopting the K2Ti6O13 nano-wire powder as a titanium source, adopting lead nitrate as a lead source, adopting high concentration KOH as a mineralizer, and carrying out a secondary hydrothermal treatment to obtain tetragonal phase perovskite lead titanate single crystal nano-sheet with a thickness of 5-50 nm. The preparation method has characteristics of simple process, easy control, no pollution, low cost, and easy large-scale production achievement.

There is provided an insulation material having a dielectric constant of 10 or more, comprising a filler having a dielectric constant of 50 or more and having two peaks in different particle size ranges in a particle size distribution and an insulating resin combined with each other; an insulation material having a dielectric constant of 10 or more comprising, as essential components, 1) at least one filler selected from the group consisting of barium titanate, strontium titanate, potassium titanate, magnesium titanate, lead titanate, titanium dioxide, barium zirconate, calcium zirconate and lead zirconate, 2) an insulating resin and 3) a dispersant containing a carboxylic group; or an insulation material comprising a filler having a dielectric constant of 50 or more, a dispersant for dispersing the filler and an insulating resin as essential components, wherein an extract of a cured product of the insulation material obtained by extraction with water at 120° C. for 20 hours using a pressure vessel has a pH of 6 or higher.

The invention belongs to piezoelectric devices, and discloses a high-performance magnetic-electric sensing transducer. Along with the progress of science and technology, the demands of people for detection sensitivity are becoming increasingly higher. However, due to the limitation of material properties, the demand for further improving the magnetic-electric coefficient and increasing the detection sensitivity is still a key issue which needs a solution but can not be solved easily. The magnetic-electric sensing transducer comprises a magnetostrictive material (1), a piezoelectric material (2) and a magnetostrictive material (3), the three material layers are bonded through insulating adhesives, the optimal thickness ratio of the three material layers is 1: (0.6-1): 1, and the piezoelectric material is a leadmagnesio niobate-lead titanate single-crystal material. The utility model has the advantage of multi-end output, simple structure, convenient manufacture, no need for any power supply and fast response. The input end has stable frequency response under the low frequency and is applicable to sensors, and the output end has high-voltage output in the resonant state and is suitable for high-performance transducers.

The invention discloses a preparation method of lead niobate ytterbate-lead titanate piezoceramic, and relates to the preparation method of piezoceramic. The invention aims to solve the problems that the traditional piezoceramic can not have high Curie temperature and high piezoceramic performance and the sintering temperature in the traditional piezoceramic preparation method is high. The preparation method comprises the following steps of: (1) synthesizing a YbNbO4 precursor; (2) preparing a (1-x)Pb(Yb1/2Nb1/2)O3-xPbTiO3 ceramic chip by adopting the YbNbO4 precursor, Pb3O4 and TiO2 as raw materials; and (3) carrying out silvered polarization on the (1-x)Pb(Yb1/2Nb1/2)O3-xPbTiO3 ceramic chip, and then obtaining the lead niobate ytterbate-lead titanate piezoceramic. The invention is mainly used for preparing the lead niobate ytterbate-lead titanate piezoceramic.