13 results about "Pyroelectric crystal" patented technology

The invention discloses a thermoelectric material composite electrolyte, a preparation method thereof and a solid-state battery, and belongs to the technical field of secondary batteries. The thermoelectric material composite electrolyte comprises a polymer matrix, a lithium salt and thermoelectric material fillers (including Li2SO4 pyroelectric crystals, CaS pyroelectric crystals, CaSe pyroelectric crystals and the like). The thermoelectric material composite electrolyte has relatively high ionic conductivity, voltage stability window and interface stability, can improve the rate capability in a wide temperature range, and shows good low-temperature rate capability and cycling stability when being applied to a solid-state battery.

The invention provides a single crystal thin film and a preparation method and application thereof, the single crystal thin film comprises a substrate layer, an isolation layer, a conductive layer and a pyroelectric crystal thin film layer which are sequentially stacked, the resistivity of the conductive layer is less than 100 ohm cm, and the transparent window of the conductive layer is 500 nm to 1.6 [mu] m. The single-crystal thin film provided by the invention can avoid polarization defects, so that the single domain rate of the single-crystal thin film can be improved, and the preparation process of the single-crystal thin film is simple.

The invention relates to the technical field of accelerators, and particularly discloses a pyroelectric electrostatic analyzer which comprises a vacuum cavity, a first pyroelectric crystal, a second pyroelectric crystal and a temperature controller. The first pyroelectric crystal and the second pyroelectric crystal are arranged in the vacuum cavity; a gap is formed between the first pyroelectric crystal and the second pyroelectric crystal to form a channel; the spontaneous polarization vectors of the first pyroelectric crystal and the second pyroelectric crystal are parallel to each other, and the directions of the spontaneous polarization vectors are consistent; the temperature controller is used for controlling the temperature of the first pyroelectric crystal and the second pyroelectric crystal, so that the polarity of a ferroelectric domain in the pyroelectric crystal with temperature change is changed to generate pyroelectric high voltage, and electric field force is provided for charged particles entering the channel, so that the charged particles meeting the condition can pass through the channel; according to the pyroelectric electrostatic analyzer, a large-size high-voltage power supply and numerous complex high-voltage components are removed, and the pyroelectric electrostatic analyzer has great advantages in the aspects of cost, size and use safety.

The application provides a niobium phosphate nonlinear optical crystal and preparation and application thereof. 12 Nb3P7O 31 , belongs to an orthorhombic system, a space group is Pna21, is a non-central symmetric structure, cell parameters are: a=0.5 nm, b=1.0 nm, c=0.5 nm, and Z=4, has a large nonlinear optical effect (3xKDP), is phase-matched, a theoretical indirect band gap is 5.11 eV, has a large laser damage threshold, a wide transmission range, stable physical and chemical properties, good mechanical properties, is not easy to deliquesce, and is easy to preserve, and can be used as a ferroelectric crystal, a pyroelectric crystal or a laser substrate material, and is widely applied in preparation of middle infrared laser nonlinear optical composite functional devices, piezoelectric devices, laser frequency conversion devices and the like.

A method for producing a neutrons includes triggering a raising or a lowering of a temperature of a pyroelectric crystal of less than about 40° C. to produce a voltage of negative polarity of at least −100 keV on a surface of a deuterated or tritiated target coupled thereto. A deuterium ion source is pulsed to produce a deuterium ion beam. The accelerating of the deuterium ion beam is achieved by accelerating voltage of the pyroelectric crystal toward the deuterated or tritiated target to produce neutrons. Furthermore, the pyroelectric crystal, the deuterated or tritiated target, and the deuterium ion source are coupled to a common support. The method also includes throwing the common support housing the pyroelectric crystal, the deuterated or tritiated target, and the deuterium ion source near an unknown threat for identification thereof.

This invention relates to a single-domain nanoscale pyroelectric single-crystal thin film and its preparation method. The single-domain nanoscale pyroelectric single-crystal thin film of this invention adds a thin pyroelectric elimination layer between the insulating pyroelectric thin film layer and the insulating layer. The material of this layer is the same as that of the pyroelectric thin film layer, but the polarity of its surface normal is reversed. This achieves the effect of improving charge accumulation in the pyroelectric crystal thin film. Simultaneously, the material of this layer is the same as that of the pyroelectric thin film layer, possessing the same physical properties, and has no effect on the piezoelectricity, pyroelectricity, or electro-optic coefficient of the thin film. The pyroelectric thin film layer in the structure of this invention exhibits high polarization intensity. Compared with the prior art method of placing electrodes on both sides of a composite thin film, this method does not introduce additional electrodes or other materials heterogeneous to the thin film, resulting in a simpler process, lower cost, less stress, and avoids problems such as thin film detachment between the pyroelectric thin film layer and the electrodes.

The invention discloses a surface-mounted production method of a pyroelectric sensor, and relates to the technical field of sensor manufacturing, and the surface-mounted production method comprises the following steps: manufacturing a PCB bottom plate, and carrying out the backflow installation of a pyroelectric conditioning chip; dispensing a conductive adhesive material on the PCB bottom plate, fixing the supporting column, and drying and curing; dispensing a conductive adhesive material on the top of the support column, fixing the pyroelectric crystal, and drying and curing the pyroelectric crystal; dispensing conductive silver paste on the edge of the PCB bottom plate, attaching a PCB enclosure, drying and curing; and mounting an optical filter on the PCB enclosure, pouring an adhesive around the optical filter, and drying and curing the optical filter. The pyroelectric sensor produced or manufactured by using the patch type production method has the characteristics of low cost, high reliability and excellent electromagnetic shielding performance, and the production method also has the characteristic of high process compatibility.

This invention relates to the field of X-ray generating equipment technology, specifically disclosing a miniature wireless pyroelectric X-ray source, comprising a conversion target, a target adapter ring, an insulating shell, an optical fiber, a graphene electrode, a pyroelectric crystal, a crystal adapter base, a getter, and a laser transmission window; one end of the target adapter ring is connected to the conversion target; one end of the pyroelectric crystal is connected to the graphene electrode; the other end of the pyroelectric crystal is grounded and connected to the crystal adapter base; one end of the laser transmission window is connected to the crystal adapter base, and the other end of the laser transmission window is connected to the optical fiber; the getter is configured to be sleeved on the crystal adapter base; the conversion target, target adapter ring, insulating shell, graphene electrode, pyroelectric crystal, crystal adapter base, getter, and laser transmission window are all encapsulated within the insulating shell; this miniature wireless pyroelectric X-ray source does not require a high-voltage power supply, does not require heating the cathode to generate electrons, has low power consumption, and can generate X-rays wirelessly, enabling remote control.

The invention provides a thermoelectric material composite diaphragm, a preparation method thereof and a battery, the thermoelectric material composite diaphragm is composed of a base film and a thermoelectric material coating arranged on the surface of the base film, and the thermoelectric material coating comprises pyroelectric crystals; the pyroelectric crystal is selected from at least one of Li2SO4, ZnO, CaS and CaSe, and the preparation method comprises the following steps: dissolving an organic thermoelectric material in a certain proportion in an organic solvent, adding an inorganic thermoelectric material to form a suspension, then coating the surface of the diaphragm with the suspension, and then performing high-temperature drying to obtain the thermoelectric material composite diaphragm. The preparation method is simple and controllable, the prepared thermoelectric material coating can generate positive and negative charges at a low temperature to deviate from the center so as to induce a polarization phenomenon, and under the condition that a negative dipole faces outwards, separation of positive lithium ions is accelerated, so that the rate capability of the lithium battery at the low temperature is improved.

The invention relates to a non-magnetic low-voltage MEMS (Micro Electro Mechanical System) sputtering ion pump based on pyroelectricity. The device comprises an electron emission layer, a first spacing layer, an electron acceleration layer, a second spacing layer and an ion adsorption layer, the thinned pyroelectric crystal in the electron emission layer can generate a pyroelectric effect after the surface temperature changes, so that potential is accumulated on the surface of the crystal and electrons are released. Different from traditional electron emission of a hot cathode and a cold cathode, the electron emission structure is stable in electron emission, low in working temperature, low in working voltage and low in requirement for the vacuum degree of a working environment. Therefore, the MEMS pyroelectric sputtering ion pump based on the pyroelectric principle provided by the invention has the advantages of low working temperature, low working voltage, no need of a magnetic field and the like, and a relatively reliable vacuum pump is provided for obtaining a vacuum environment of an MEMS type vacuum device.

The invention relates to the technical field of X-ray generation equipment, and particularly discloses a miniature wireless pyroelectric X-ray source, which comprises a conversion target, a target adapter ring, an insulating tube shell, an optical fiber, a graphene electrode, a pyroelectric crystal, a crystal adapter seat, a getter and a laser transmission window, one end of the target adapter ring is connected with the conversion target; one end of the pyroelectric crystal is connected with the graphene electrode; the other end of the pyroelectric crystal is grounded and is connected with the crystal adapter; one end of the laser transmitting window is connected with the crystal adapter, and the other end of the laser transmitting window is connected with the optical fiber; the getter is configured to be arranged on the crystal adapter in a sleeving manner; the conversion target, the target adapter ring, the insulating tube shell, the graphene electrode, the pyroelectric crystal, the crystal adapter seat, the getter and the laser transmission window are all packaged in the insulating tube shell; the miniature wireless pyroelectric X-ray source does not need to be powered by a high-voltage power supply, does not need to heat the cathode to generate electrons, is low in power consumption, can generate X-rays in a wireless mode, and realizes remote control.

The invention discloses a liquid-like surface droplet control method based on a pyroelectric effect, a microfluidic platform designed by the method is composed of a liquid-like surface, a pyroelectric crystal material and a photo-thermal response material, and near-infrared light penetrates through a pyroelectric crystal and is irradiated to the photo-thermal response material to realize photo-thermal conversion; charge gradient is generated on the surface of the pyroelectric crystal after the pyroelectric crystal is heated, and then directional control over various liquid drops is achieved under the action of dielectrophoretic force. According to the micro-fluidic platform, directional control over liquid drops is achieved through light-heat-electric layer-by-layer transfer, the essence is that the liquid drops on the surface are controlled by light, and higher control flexibility is provided for the platform. The liquid drop control platform designed by the invention can control various liquid drops from low surface tension to high surface tension, overcomes the defects of liquid drop control on a traditional super-hydrophobic surface and an oil injection type super-lubricating surface, and has good environment-resistant stability and control flexibility.

The invention provides a niobium phosphate nonlinear optical crystal as well as preparation and application thereof. The chemical formula of the nonlinear optical crystal is Na12Nb3P7O31, the nonlinear optical crystal belongs to an orthorhombic system, the space group is Pna21, the nonlinear optical crystal is of a non-centrosymmetric structure, the cell parameters are # imgabs0 # and Z = 4, the nonlinear optical crystal has a large nonlinear optical effect (3 * KDP), phase matching is achieved, the theoretical indirect band gap is 5.11 eV, and the nonlinear optical crystal can be used as a nonlinear optical crystal. The material has the advantages of larger laser damage threshold, wide transmission range, stable physical and chemical properties, good mechanical properties, difficulty in deliquescence, easiness in storage and the like, can be used as a ferroelectric crystal, a pyroelectric crystal or a laser matrix material, and is widely applied to preparation of devices such as intermediate infrared laser nonlinear optical composite functional devices, piezoelectric devices, laser frequency conversion devices and the like.