41results about How to "High pyroelectric coefficient" patented technology

The invention discloses an anti-ferroelectric membrane with adjustable working temperature area and large heat-releasing rate, and the method for preparing the same and its application. It applies sol-gel method to prepare said anti-Ferroelectric membrane ((Pb, La or Nb) (Zr, Sn, Ti) O3, the solute of precursor comprises acetate lead, the acetate lanthanum or ethanol nb, acetate tin, zirconium iso-propoxide and titanium iso-propoxide; the solvent comprises acetic acid, glycol ethylene ether and water; the final concentration of precursor is controlled between 0.2-0.4 M. the bed piece is LaNiO3/Pt/Ti/SiO2/Si and Pt/Ti/SiO2/Si. The product is mainly used for infrared heat-releasing electrical detector, smart device and system.

The invention discloses an antiferroelectric film with adjustable working temperature zone and higher pyroelectric coefficient and a preparation method and application thereof. The antiferroelectric film (Pb,Nb)(Zr,Sn,Ti)O3 taken as the pyroelectric material is prepared by a sol gel method, the solute of precursor solution can be lead acetate, lanthanum acetate or niobium ethoxide, stannic acetate, zirconium isopropoxide and titanium isopropoxide, the solvent includes glacial acetic acid, ethylene glycol ethyl ether, acetylacetone and water, the final concentration of the precursor solution is controlled between 0.2-0.4 M, and the substrate comprises LaNiO3/Pt/Ti/SiO2/Si and Pt/Ti/SiO2/Si. The antiferroelectric film is high in thermally stimulated current and adjustable in temperature andcan be used for a pyroelectric infrared detector, a smart device and a system.

The invention which relates to an FE-AFE phase change pyroelectric ceramic material belongs to the field of pyroelectric ceramic. The invention discloses the FE-AFE phase change pyroelectric ceramic material, a pyroelectric ceramic element and preparation methods of the material and the element. Chemical components of the ceramic material accord with a general chemical formula of (Pb1-3x/2Lax)(ZryTizSn1-y-z)O3, wherein x is more than 0 and equal to or less than 0.025, y is from 0.38 to 0.46, and z is from 0.14 to 0.18; and the ceramic material is in a ferroelectric phase at room temperature and can generate an FE-AFE phase change with the temperature change with or without an extra electric field. The pyroelectric ceramic element has a large polarized change with the FE-AFE phase change after being polarized or under the effect of a direct current bias, so a large pyroelectric response is obtained, a pyroelectric coefficient is 2-4 times more than traditional pyroelectric coefficients, and heat stagnation substantially does not exist, so the pyroelectric ceramic element can be used in the uncooled infrared detection technology and the fields of heat-electrical energy transformation and the like.

The invention discloses a method for preparing a porous barium strontium titanate field pyroelectric ceramic, comprising the following steps: firstly, mixing raw materials according to a stoichiometric ratio of respective chemical formula; pre-sintering the mixture at 800-1200 DEG C for 1-6 hours to obtain pre-sintered ceramic powder; then adding an organic substance pore-forming agent, mixing uniformly, tabletting and forming; heating again to remove organic substances; sintering, grinding, cleaning, adding an electrode and sintering the electrode. The porous BST field pyroelectric ceramic of the invention has the advantages of high pyroelectric coefficient, low dielectric loss, proper dielectric constant and excellent comprehensive pyroelectric property, and meets the requirements for manufacturing pyroelectric infrared detectors.

The invention discloses a multielement composite pyroelectric ceramic material and a preparation method thereof. The chemical general formula of the material is xPb(Me1/3Nb2/3)O3-yPb(Fe1/2Nb1/2)O3-zPb(Zr0.9Ti0.1)O3-mMe', wherein Me is one of Mn or Zn; x, y and z are respectively a mole coefficient, x is greater than or equal to 0.01 and less than or equal to 0.07, y is greater than or equal to 0.01 and less than or equal to 0.07, z is greater than or equal to 0.9 and less than or equal to 0.92, and x + y + z = 1; and Me' is a modifying metal element, m is a mole coefficient, and m is greater than or equal to 0 mol % and less than or equal to 5 mol %. The multielement composite pyroelectric ceramic material provided by the invention has a high pyroelectric coefficient, proper dielectric properties and a low dielectric loss, and the electrical properties can be adjusted, therefore, the multielement composite pyroelectric ceramic material has a good prospect in devices such as pyroelectric detectors and the like.

The invention relates to a high-Curie-temperature strontium-barium niobate pyroelectric ceramic material and a preparation method thereof. The material has the composition general formula of SrxBa1-xNb2O6, wherein x is larger than or equal to 0.25 and smaller than or equal to 0.35. The SBN ceramic material high in density and pyroelectric performance is obtained by preparing power through a solid phase method, preparing an SBN blank through cold isostatic pressing forming and other processes, putting the SBN blank in a mold, filling and covering the SBN blank with ZrO2 powder, raising the temperature to 1100-1150 DEG C, linearly and evenly pressurizing to 100-200 MPa with the axis of the mold as the hot-press axis, raising the temperature to 1200-1300 DEG C, keeping the temperature and the pressure for 2-4 h in the air atmosphere, and linearly depressurizing and cooling inside a furnace to the room temperature. The problem that high-Curie-temperature SBN components are poor in pyroelectric performance is solved.

The embodiment of the invention discloses a method for preparing a conducting polymer pyroelectric nano film. The method comprises the steps of preparing a conducting polymer nano wire by adopting a template process; then preparing a conducting polymer nano wire film by adopting an LB film process; and finally, doping and reducing the nano wire film by adopting a chemical process to obtain the conducting polymer pyroelectric nano film structure. The conducting polymer pyroelectric nano film prepared by adopting the method disclosed by the invention has the advantages of high pyroelectric coefficient, high thermal conductance and good stability, and has wide application in micro/nano energy collection and energy storage devices.

The invention relates to a chip-type intelligent pyroelectric infrared sensor, which is a closed structure shell composed of a tube cap and a substrate. The upper surface of the tube cap has a window, and an infrared optical filter is embedded on the window; and the tube cap and the A receiving space is formed between the substrates, and the receiving space accommodates and encapsulates the infrared sensitive element, the supporting component and the signal processing module; the infrared sensitive element is fixed by the supporting component, and the supporting component and the signal processing module are directly fixed on the substrate. The pyroelectric infrared sensor of the present invention has the characteristics of miniaturization, intelligence, and the ability to output multiple control signals. This packaging structure is suitable for SMT automatic patch and reflow soldering processes, which is conducive to mass automatic production and improves manufacturing efficiency. Reduce manufacturing costs.

The invention relates to a BNT-based lead-free pyroelectric ceramic material with low dielectric loss and a preparation method thereof. The BNT-based lead-free pyroelectric ceramic material adopts a chemical composition of (1-x)(Bi0.5Na0.5)TiO3-xBa(Ni0.5Nb0.5)O3, and x is greater than 0 and is smaller than or equal to 0.04.

A unit pyroelectric infrared detector consists of top and bottom electrodes, BST ceramic semiconductor and BST ceramic oxide layer media wrapped outside of said semiconductor. It features that BST ceramic semiconductor is prepared by high temperature sintering and reduction heat treating ( Ba 0.7 Sr 0.3 ) TiO3 ceramic base material doped with 1 ¿C 5 wt % rare earth impurities with its thickness less than 0.20mn and resistance rate less than 10ª©.cm, BST ceramic oxide layer media is prepared by oxidizing surface of ceramic semiconductor with its thickness of 5 ¿C 10 micro m. The preparing method is also provided.

The invention relate to a method for preparing high-performance BST (barium strontium titanate) pyroelectric ceramics by adopting a post-annealing process. According to the method, BST ceramics obtained through sintering is subjected to annealing at the oxygen atmosphere, the annealing temperature ranges from 800 DEG C to 1,250 DEG C, the annealing time ranges from 2 hours to 5 hours, and then the high-performance BST pyroelectric ceramics can be prepared. According to the method for preparing the high-performance BST pyroelectric ceramics by adopting the post-annealing process, the annealing treatment is performed after the BST pyroelectric ceramics is obtained through sintering, and the high-performance BST pyroelectric ceramics can be prepared; the dielectric constant is high and can be higher than 9,500; the pyroelectric coefficient is high and can be higher than 18*10<-8>C/cm<2>K; and further, a sample is high in purity and performance and good in uniformity, manufacturing requirements of an uncooled infrared focal plane device can be met, and the problem that the BST ceramics cannot be sintered to high density is effectively solved.

The invention provides a stress strain-assisted pyroelectric composite material. The composite material combines a pyroelectric material layer and a stress strain material layer; when the pyroelectric layer senses outside temperature changes caused by infrared light and changes of electric polarization happens, a stress strain applying layer generates stress strain under effects of outside conditions and the stress strain is transmitted to the pyroelectric layer, the changes of the electric polarization of the pyroelectric layer is thus enhanced, and a pyroelectric coefficient is improved. When the pyroelectric composite material is applied to the technical field of infrared detection, the detection sensitivity can be improved effectively, and the application prospect in the technical field of infrared detection is thus good.

A method for producing a micro system, said method comprising: providing a substrate (2) made of aluminum oxide; producing a thin film (6) on the substrate (2) by depositing lead zirconate titanate onto the substrate (2) with a thermal deposition method such that the lead zirconate titanate in the thin film (6) is self-polarized and is present predominantly in the rhombohedral phase; and cooling down the substrate (2) together with the thin film (6).

The invention discloses a composite pyroelectric ceramic material and a preparation method thereof. The chemical general formula of the material is Pb {[(Me1/3Nb2/3)x(W1/3Fe2/3)1-x]y(Zr0.9Ti0.1) (1-y) }O3-nMe', wherein Me is Mg or Zn; x and y represent a mole fraction respectively, x is larger than or equal to 0.125 and smaller than or equal to 0.875, and y is larger than or equal to 0.08 and smaller than or equal to 0.11; Me' is a modified element and is one or more of Li, La and Sb, and the molar ratio range n is larger than or equal to 0 mol% and smaller than or equal to 5 mol%. The composite pyroelectric ceramic material has a higher pyroelectric coefficient and adjustable dielectric property, thereby having a better application prospect in various pyroelectric detectors.

The invention relates to a pyroelectric ceramic material and a preparation method thereof. The prepared zirconium-rich pyroelectric ceramic material has high pyroelectric coefficient in the temperature range of 10-80 DEG and high figure of merit of detectivity. A pyroelectric infrared sensor manufactured bu using the ceramic material has a high-level sensor sensitivity in the temperature range of10-80 DEG C in the case of thick ceramic, for example, ceramic of 0.15 mm thick, and the requirements of manufacture of high performance infrared pyroelectric sensors are met.