25 results about "Relaxor ferroelectric" patented technology

The application discloses a self-supporting structure deep water transducer based on a relaxor ferroelectric single crystal, which comprises a certain number of transducer units, each of which comprises a piezoelectric element, a transition block, a curved shell, a force transmission plate and a radiation panel; the piezoelectric element adopts a relaxor ferroelectric single crystal element; the curved shell adopts a type VII bending-stretching transducer shell form with the long axis and the short axis vibrating in phase, one force transmission plate is added to the outside of the short axis of the shell, a certain number of transducer units are arranged in a certain rule, the radiation panel is connected to the transducer units through the force transmission plates at both ends of the transducer units, the transverse vibration of the single crystal element is amplified in displacement through the curved shell at the short axis of the shell, the vibration is transmitted to the radiation panel through the force transmission plate, the radiation panel is used for reducing the working frequency, unifying the vibration phase of the transducer units, directly facing the fluid to bear the hydrostatic pressure, and isolating the internal space from the external fluid; the static pressure of the external fluid acts on the radiation panel and then acts on the short axis of the shell through the force transmission plate.

The application discloses an iron-based barium sodium niobate ceramic material with high energy storage performance and a preparation method thereof. 4‑2x Sm 2x Na2Fe x Nb 10‑x O 30 , wherein 1<=x<=1.25. Barium carbonate, samarium oxide, sodium carbonate, ferrous oxide and niobium pentoxide are used as raw materials, and a standard solid-phase method is adopted to sinter the iron-based barium sodium niobate ceramic material. In the product formula, iron is used to replace niobium in the barium sodium niobate, which is lead-free, environment-friendly, rich in iron reserves and low in price, and is beneficial to control the cost of raw materials. In addition, the iron replacement is beneficial to enhance the relaxor ferroelectric performance of the material, can obtain a more slender hysteresis loop, and improves the energy storage efficiency of the material. The prepared ceramic material has few pores and cracks, high density, and the microstructure is obviously improved, the grain size is more fine and uniform, the ferroelectric polarization intensity and the breakdown field strength are significantly improved, the problem that the barium sodium niobate material is difficult to sinter is solved, and the ferroelectric performance and the energy storage performance are significantly improved.

The application discloses layered composite lead-free relaxor ferroelectric material and a preparation method thereof, and belongs to the technical field of piezoelectric ceramics, and overcomes the defects that the strain excited by the lead-free relaxor ferroelectric material in the prior art is small under a low driving electric field. The layered composite lead-free relaxor ferroelectric material comprises a first relaxor ferroelectric layer, a ferroelectric layer and a second relaxor ferroelectric layer arranged in sequence; and in the layered composite lead-free relaxor ferroelectric material, 0 < ferroelectric layer mass percentage < 30%. The application provides the layered composite lead-free relaxor ferroelectric material which has low driving electric field and large strain.

The application relates to the technical field of inorganic nonmetal functional ceramic materials, and discloses a polar vortex structure relaxor ferroelectric ceramic material and a preparation method and application thereof, the material is of a chemical formula (1-x)(0.7NaNbO3-0.3Sr 0.7 Bi 0.2 TiO3)-xCaSnO3, wherein 0<=x<=0.2, and a characteristic value is x=0.1. By adopting a step-by-step solid-phase reaction method, NaNbO3, Sr 0.7 Bi 0.2 TiO3 and CaSnO3 ceramic powders are pre-synthesized, then are ball-milled according to a stoichiometric ratio and are sintered into ceramics. The prepared ceramic material has a multi-phase coexistence, core-shell and polar vortex structure, and exhibits high saturation polarization intensity, low hysteresis, large breakdown field strength and excellent service stability, and has potential application in high-power pulse devices. The material is environment-friendly and simple in process, and is expected to provide a new technical path for design and preparation of high-performance and high-stability nonlinear dielectric energy storage materials.

The invention relates to the technical field of phase field simulation, and discloses a transmission imaging simulation method, device and equipment of a polar nanometer microcell and a medium, and the method comprises the following steps: determining a target analysis area of a relaxor ferroelectric sample; performing transmission electron microscope imaging and dark field imaging under diffraction conditions on the target analysis area; based on the dark field image, extracting size distribution and surface density parameters of the polar nanometer micro-area; based on transmission electron microscope imaging, lattice distortion rate parameters of the polar nanometer micro-area are extracted; based on the surface density parameter, determining a simulation concentration value of the reaction-diffusion model; and controlling the reaction-diffusion model to run and simulate a dynamic self-organizing evolution process of the polar nanometer micro-area under set area size and boundary conditions so as to obtain a polar nanometer micro-area aggregation form of the polar nanometer micro-area output by the reaction-diffusion model. According to the scheme, the prediction of the static morphology characterization and dynamic self-organization process of the polar nano micro-area can be realized, and the performance optimization of the relaxor ferroelectric material is improved.

The invention relates to the technical field of piezoelectric materials, and discloses an interface modification-based trigonal phase relaxor ferroelectric single crystal depolarization inhibition method, which comprises single crystal pretreatment, polarization electric field optimization, interface modification layer construction, gradient annealing treatment, stabilization electric field application and protection layer packaging. Through single crystal pretreatment and polarization electric field optimization, it is guaranteed that the surface of a single crystal is smooth and clean, a main polarization electric field is applied in the protective atmosphere through a stepped boosting method, single crystal oxidative damage is avoided, the polarization effect is improved, and a foundation is laid for depolarization inhibition; through construction of an interface modification layer and gradient annealing treatment, a high-dielectric-constant interface layer is formed on the surface of a single crystal, internal stress is eliminated under a protective atmosphere through multi-stage program temperature control annealing, the interface bonding strength and the crystal structure stability are enhanced, and the depolarization process is inhibited.

This invention discloses a method for establishing a phase-field model of a polycrystalline phase relaxor ferroelectric, the method comprising the following steps: 1. Determining the free energy of the polycrystalline phase relaxor ferroelectric; 2. Determining the order parameter of the polycrystalline phase relaxor ferroelectric as spontaneous polarization. P i 3. Represent free energy as spontaneous polarization P i The invention employs several methods: 1) introducing ferroelectric-ferroelectric phase boundaries and random local electric fields; 2) solving the Ginzburg-Landau partial differential equations to obtain the spatial evolution of spontaneous polarization, thereby determining the domain structure of polycrystalline relaxed ferroelectrics and ultimately establishing a phase-field model for polycrystalline relaxed ferroelectrics. Based on a model ferroelectric system, this invention, by considering ferroelectric-ferroelectric phase boundaries and random local electric fields, reproduces the unique domain structure characteristics of polycrystalline relaxed ferroelectrics with the coexistence of multiple nanometer-sized ferroelectric phases, establishes a phase-field model for polycrystalline relaxed ferroelectrics, and improves the theoretical model of polycrystalline relaxed ferroelectrics, which is beneficial for guiding the design of novel high-performance ferroelectric materials.

The invention discloses a relaxor ferroelectric single crystal-based Y waveguide chip integrated structure and a preparation method and application thereof, and the method comprises the steps: sputtering a titanium film on the surface of a PIN-PMN-PT substrate, transferring a Y waveguide pattern to the titanium film after photoetching, carrying out the selective etching of the titanium film after photoetching, forming a Y-type titanium diffusion waveguide pattern, and carrying out the preparation of the relaxor ferroelectric single crystal-based Y waveguide chip integrated structure. The substrate with the Y-type titanium diffusion waveguide pattern and PbO powder are sealed and then subjected to titanium diffusion for 12-36 h at the temperature of 900-1000 DEG C, and then annealing is conducted in the oxygen atmosphere; then depositing a SiO2 buffer layer on the PIN-PMN-PT substrate, etching an electrode contact window pattern, evaporating a gold film on the etched SiO2 buffer layer, and then selectively etching and reserving the gold film corresponding to the electrode contact window pattern as a modulation electrode; and performing optical grinding and polishing and polarization on the end face of the Y waveguide chip. According to the invention, the PIN-PMN-PT single crystal is taken as the substrate, and an optimized titanium diffusion and electrode preparation process is combined, so that the Y waveguide device with low half-wave voltage, low transmission loss and high temperature stability is prepared, and the Y waveguide device can be applied to a spaceflight-level fiber-optic gyroscope system.

The invention belongs to the field of semi-solid batteries, and particularly relates to a modified relaxor ferroelectric polymer, a modified semi-solid electrolyte, a preparation method and application of the modified relaxor ferroelectric polymer and the modified semi-solid electrolyte, and a battery. A polymer chain of the polymer modified intermediate is modified with double bonds, and then the polymer modified intermediate and a modifier are polymerized to prepare the modified relaxor ferroelectric polymer; the modifier is represented by formula 1 (). The relaxation polymer is innovatively subjected to dehalogenation treatment and then innovatively subjected to combined polymerization with the formula 1, so that the polymerization behavior and the polymerization structure can be regulated and controlled, the relaxation polymer accidentally adapts to the application requirements of the semi-solid electrolyte, the flowability of the electrolyte can be effectively bound, the electrochemical window of the liquid electrolyte is improved, and the growth of lithium dendrites on the negative electrode side is inhibited; and thus, the high-pressure resistance, the high-temperature resistance stability and the long cycle performance of the semi-solid polymer electrolyte are improved.

The invention belongs to the field of ceramic materials, and particularly relates to a lead-free ferroelectric ceramic material and a preparation method thereof.The preparation method comprises the steps that aluminum nitrate nonahydrate and titanium isopropylate are dissolved in ethylene glycol and stirred, a citric acid solution is added, stirring continues, and a precursor solution A is prepared; dissolving bismuth nitrate pentahydrate in a citric acid solution, and stirring to prepare a precursor solution B; mixing the precursor solution A and the precursor solution B, stirring and drying to form gel; drying, grinding and crushing the gel, and calcining to obtain ceramic powder; the preparation method comprises the following steps: uniformly mixing ceramic powder and nano barium titanate powder by taking deionized water as a medium, and drying to obtain precursor powder; grinding and granulating the precursor powder and a 5wt% polyvinyl alcohol solution in an agate mortar, and then applying axial pressure to form a green body; and putting the green body into a corundum crucible with a cover, and sintering by using a two-step method to finally obtain the lead-free ferroelectric ceramic material. According to the invention, a universal combined optimization strategy is provided, and a strong relaxation ferroelectric system is developed.

This invention relates to the field of relaxor ferroelectric ceramic dielectric energy storage materials, specifically to a sodium bismuth titanate-based relaxor ferroelectric ceramic and its preparation method, wherein the chemical composition of the sodium bismuth titanate-based relaxor ferroelectric ceramic is (1-x)BNLT. ‑x BAN, of which BNLT is 0.9Bi 0.5 Na 0.5 TiO3-0.1Bi 0.5 Li 0.5 TiO3, BAN is BaAl 0.5 Nb 0.5 The value of O3 and x ranges from 0.06 to 0.18. When x = 0.15, the ceramic exhibits excellent performance with a recoverable energy storage density (Wrec) of not less than 14.0 J / cm³ and an energy storage efficiency (η) of not less than 84% under an electric field of 775 kV / cm. This invention employs a solid-state reaction sintering process, which is simple to prepare and low in cost, making it suitable for high-performance energy storage capacitors in pulsed power systems.

The application relates to the technical field of dielectric energy storage device materials, in particular to a high-entropy design bismuth ferrite-based energy storage ceramic, a preparation method and application thereof, the material has a chemical composition formula of (0.7-x)Bi 0.9 (Sm 0.5 Gd 0.5 ) 0.1 FeO3-0.3(Sr 0.5 Ba 0.5 )TiO3-xNaNbO3-yMnO2, wherein the value range of x is 0-0.15, and the value of y is 0-0.005. The application adopts a high-entropy strategy to design a relaxor ferroelectric material, multiple elements occupy the same site of the material to produce lattice distortion, promote the relaxor characteristics of the bismuth ferrite-based ceramic, and optimize the electric hysteresis loop. The NaNbO3 antiferroelectric material is introduced to destroy the long-range ferroelectric order and enhance the local random field, which is beneficial to obtaining a lower P r value. In addition, the appropriate addition of 0.5% mol of MnO2 can reduce the concentration of oxygen vacancies, thereby reducing the leakage current of the material, and the energy storage efficiency is improved. The material design not only enriches the application field of high-entropy ceramics, but also provides a new idea for improving the performance of energy storage ceramics.

The invention discloses a high-performance large-size 1t; 111gt, 111gt; the invention relates to a c-oriented PST single crystal and a preparation method thereof, and belongs to the technical field of relaxor ferroelectric crystal materials, the preparation method comprises the following steps: filling PST-cosolvent mixed powder into a platinum crucible with a cover, compacting and sealing, putting the platinum crucible into a crystal growth furnace, and using a corundum crucible, the whole crystal growth process being an oxygen introduction mode; growing in a high-purity oxygen protection atmosphere at the temperature of 1220-1250 DEG C by adopting a cosolvent method, regulating and controlling the degree of supercooling through gradient cooling, and growing the pseudo-cubic PST crystal until the size is not smaller than a set size; the atmosphere in the furnace is switched into argon protection, and the temperature is reduced to the room temperature in a segmented gradient mode; performing staged ordered annealing treatment on the crystal to obtain an annealed pseudo-cubic PST crystal; performing cutting, crystal orientation, grinding and polishing on the annealed pseudo-cubic PST crystal in sequence to obtain 1t; 111gt, 111gt; c, orienting the PST single crystal; large-size growth is realized, and B-site ions are highly ordered; 111gt, 111gt; and c, coordinated regulation and control of accurate orientation acquisition.

The present application relates to the technical field of material, and discloses a method for enhancing the electrostriction of sodium bismuth titanate-based relaxor ferroelectric.The present application induces the original large-size non-percolating polar region in the percolating sodium bismuth titanate-based relaxor by pre-polarizing the sodium bismuth titanate-based relaxor ferroelectric ceramic near the critical position synthesized by the traditional solid-phase method, reduces the nucleation barrier in the field-induced strain process, and significantly enhances the electrostriction effect.The sodium bismuth titanate-based relaxor ferroelectric ceramic of the present application has obviously improved electrostriction under the excitation of 60 kV / cm electric field compared with the initial state, and has more excellent performance than the ordinary sodium bismuth titanate-based relaxor ferroelectric ceramic.

The invention relates to the technical field of functional film material preparation, and discloses a preparation method of a relaxor (anti) ferroelectric material. Aiming at the problems of difficulty in component control, complex components and the like of the traditional relaxor ferroelectric, the relaxor (anti) ferroelectric film material is prepared by adopting a Joule heat (electromagnetic induction) flash heating and liquid nitrogen quenching synergistic process, and the preparation method comprises the following specific steps: spin-coating a precursor solution on a conductive substrate to obtain a raw material film; drying the prepared raw material film in a muffle furnace at 450 DEG C for 3 minutes; the Pb (Zr < 1-x > Ti < x >) O < 3 > amorphous film with the required thickness is prepared; and then heating to 650 DEG C at a heating rate of 1000 DEG C / s, annealing, and carrying out liquid nitrogen quenching cooling on the annealed amorphous film. According to the method, the film preparation efficiency is greatly improved, and the production energy loss is greatly reduced.

The application relates to the technical field of piezoelectric materials, and discloses a method for inhibiting depolarization of a trigonal phase relaxor ferroelectric single crystal based on interface modification, which comprises single crystal pretreatment, polarization electric field optimization, interface modification layer construction, gradient annealing treatment, stable electric field application and protective layer packaging. Through single crystal pretreatment and polarization electric field optimization, the surface of the single crystal is ensured to be smooth and clean, a step-by-step boosting method is adopted to apply a main polarization electric field in a protective atmosphere, oxidation damage of the single crystal is avoided, and the polarization effect is improved, thereby laying a foundation for inhibiting depolarization. Through interface modification layer construction and gradient annealing treatment, a high dielectric constant interface layer is formed on the surface of the single crystal, internal stress is eliminated in a protective atmosphere through multi-stage program temperature annealing, the interface bonding strength and the crystal structure stability are enhanced, and the depolarization process is inhibited.

This invention relates to the field of dielectric energy storage ceramic materials, specifically to a CaTiO3-based relaxor ferroelectric ceramic material and its preparation method. The general chemical formula of the CaTiO3-based composite relaxor ferroelectric ceramic material is: (1-x)Ca 0.5 Bi 0.25 Na 0.25 TiO3-xBaZrO3, where 0 < x ≤ 0.30, is produced by solid-state reaction method, in which Bi2O3, Na2CO3, CaCO3, TiO2, BaCO3, and ZrO2 are stoichiometrically proportioned, followed by wet ball milling, pre-calcination, granulation, tableting, debinding, and sintering. This invention, by constructing a relaxor ferroelectric heterojunction, synergistically optimizes the breakdown field strength, polarization intensity, and dielectric loss, solving the problems of polarization saturation and low energy storage efficiency in traditional ferroelectrics.

This invention discloses an A-site doped lead-free ceramic material, its preparation method, and its applications, relating to the field of dielectric ceramics technology. This invention simultaneously introduces multiple cations such as Sr, Ca, Bi, and Na into the A-site (Ba) of a barium titanate (BaTiO3) matrix to construct a high-entropy doped structure, effectively controlling lattice distortion and local polarization behavior, thereby obtaining excellent relaxor ferroelectric properties and high breakdown field strength. The material is prepared using an electrospinning combined with heat treatment process to form a nanofiber structure with a beaded morphology, significantly inhibiting abnormal grain growth, increasing density, and reducing defect concentration. The resulting ceramic exhibits high energy density, high energy storage efficiency, and excellent cycle stability over a wide temperature range. It is also free of toxic elements such as lead, making it environmentally friendly and suitable for high-temperature, high-power electronic devices in new energy vehicles, 5G communications, aerospace, and other fields, providing a reliable technical solution for developing next-generation high-performance lead-free energy storage capacitors.

The application discloses a high-performance relaxor ferroelectric single crystal and a preparation method and application thereof, and belongs to the technical field of piezoelectric materials. Based on a TSSG method, through the synergistic effect of a bottom oxygen feeding technology and component regulation, a technical problem that a piezoelectric charge coefficient d 33 and a piezoelectric voltage coefficient g 33 are difficult to be considered simultaneously in the existing relaxor ferroelectric single crystal is successfully solved. The bottom oxygen feeding technology effectively inhibits Pb element volatilization and compensates oxygen vacancies, greatly reduces the defect density and the content of impurities in the crystal, and eliminates the pinning effect of defect dipoles on domain switching. In combination with accurate construction of a morphotropic phase boundary, the single crystal can fully release the polarization deflection advantage caused by the coexistence of multiple phases. The prepared PYN-PMN-PT relaxor ferroelectric single crystal realizes the coexistence of high piezoelectric response and excellent piezoelectric voltage coefficient, and significantly improves the quality factor of the material.

The application discloses a sodium bismuth titanate-based relaxor ferroelectric material with high electro-strain, low hysteresis and high temperature stability and a preparation method thereof, and belongs to the technical field of functional materials. (0.47‑x) Li x / 2 K x / 2 Bi 0.47 Ba 0.06 TiO3, wherein 0.06<=x<=0.10. The material has high electro-strain, low hysteresis and high temperature stability, and is suitable for micro displacement devices. The preparation method comprises the following steps: weighing raw materials according to stoichiometric ratios, ball milling, drying, grinding, calcining, ball milling again, drying and grinding again; adding a binder to granulate and sinter to obtain ceramic sheets; and polishing the ceramic sheets and electroplating silver on surfaces of the ceramic sheets. The method is simple, low in cost and suitable for large-scale production.

The application relates to the technical field of electronic functional materials and devices, and relates to a sodium bismuth titanate-based relaxor ferroelectric ceramic material with a composition gradient structure and a preparation method. 0.47 Na 0.47 Ba 0.06 Ti 1‑x (Li 1 / 4 Nb 3 / 4 ) x O3, and the preparation method comprises the following steps: according to the chemical formula, mixing raw materials, and sequentially performing a first ball milling, discharging, drying, pre-sintering, a second ball milling, discharging, drying, roller milling, flow casting, laminating and pressing, degassing and sintering processes to obtain the ceramic material. Compared with the prior art, the material provided by the application is a multilayer composite lead-free material, the ceramic has a novel design structure, the high electrocaloric effect in a wide temperature range is excellent, has great application prospects in the field of novel solid-state refrigeration technology, is not easy to pollute and damage the environment, has low preparation cost, good stability and the like.

The invention discloses a memcapacitor and an implementation method thereof, and the method utilizes the field-induced phase change effect of a relaxor ferroelectric material to obtain phases with different symmetry by applying different voltages to induce phase change, thereby obtaining different electric field controllable capacitance states. According to the memcapacitor based on the relaxor ferroelectric material, the memcapacitor based on the relaxor ferroelectric material achieves good reproduction of long term synaptic plasticity (LTP) and plasticity dependent on the peak time (STDP) by using a customized pulse sequence, and the memcapacitor based on the relaxor ferroelectric material achieves good reproduction of the long term synaptic plasticity (LTP) and the plasticity dependent on the peak time (STDP) and the memcapacitor based on the relaxor ferroelectric material based on the relaxor ferroelectric material based on the memcapacitor based on the relaxor ferroelectric material based on the relaxor ferroelectric material.

The invention provides a lead-based antiferroelectric / relaxor ferroelectric composite ceramic material and a preparation method and application thereof.The lead-based antiferroelectric / relaxor ferroelectric composite ceramic material comprises an antiferroelectric phase material and a relaxor ferroelectric phase material, the antiferroelectric phase material is Pb < 0.94 > La < 0.04 > (Zr < 0.84 > Sn < 0.15 > Ti < 0.01 >) O3, and the relaxor ferroelectric phase material is 0.8 Ba (Zr < 0.1 > Ti < 0.9 >) O < 3 >-0.2 Bi (Zn < 2 / 3 > Ta1 / 3) O3; the nominal chemical formula of the lead-based antiferroelectric / relaxor ferroelectric composite ceramic material is Pb < 0.94 > La < 0.04 > (Zr < 0.84 > Sn < 0.15 > Ti < 0.01 >) O < 3 > / 0.8 Ba (Zr < 0.1 > Ti < 0.9 >) O < 3 >-0.2 Bi (Zn < 2 > / 3 > Ta1 / 3) O < 3 >; the mass percent of the relaxor ferroelectric phase material relative to the antiferroelectric phase material is x, and x is more than 0 and less than or equal to 4wt%.

Methods and thermal switches (10) for modulating heat flow. The methods include applying a thermal gradient across a self-standing bulk relaxor ferroelectric material (12) (28) lacking a substrate and having a thickness of at least five micrometers, and applying an electric field across the ferroelectric material (12) (28) to modulate heat flow. The switches (10) include electrodes (14) and thermal couplers (18) operatively coupled to respective faces (22) (24) of the ferroelectric material (12) (28). The electrodes (14) are configured to apply an electric field to the bulk relaxor ferroelectric material (12) (28). The thermal couplers (18) are configured to define a thermal path through the ferroelectric material (12) (28) that includes at least a portion of the bulk relaxor ferroelectric material (12) (28) across which the electric field is applied. The electric field alters the thermal conductivity of the ferroelectric material (12) (28) between the thermal couplers (18), and thus the thermal conductivity of the thermal switch (10).

The invention discloses a relaxor ferroelectric polymer electrolyte film and a preparation method and application thereof, and belongs to the technical field of solid electrolyte. The method comprises the following steps: mixing an inorganic relaxor ferroelectric material, a polymer, a sodium salt and an organic solvent, heating and stirring to obtain a uniform bubble-free mixed solution; and pouring the mixed solution into a mold for shaping, and drying to obtain the relaxor ferroelectric polymer electrolyte film. The electrolyte film has high ionic conductivity, high ionic transference number and high mechanical property. The sodium metal battery prepared from the electrolyte film has excellent electrochemical performance.