63 results about "Relaxor ferroelectric" patented technology

The invention provides an anti-ferroelectric lanthanum ferrite, bismuth ferrite and strontium titanate superlattice film with high energy storage density as well as a preparation method and application thereof. The anti-ferroelectric lanthanum ferrite, bismuth ferrite and strontium titanate superlattice film with high energy storage density comprises a substrate layer, a bottom electrode layer and a plurality of stacked relaxation ferroelectric layers, wherein the bottom electrode layer and the multiple stacked relaxation ferroelectric layers are sequentially arranged on the substrate layer; each relaxor ferroelectric layer sequentially comprises a first functional layer, a second functional layer and a third functional layer from bottom to top; the first functional layer comprises LaFeO3, the second functional layer comprises BiFeO3, and the third functional layer comprises SrTiO3. The anti-ferroelectric lanthanum ferrite, bismuth ferrite and strontium titanate superlattice thin film with the high energy storage density has small electric leakage performance and high polarization value, and more excellent energy storage performance is achieved.

The invention belongs to the technical field of functional ceramic materials, and provides a lead-free high-entropy relaxor ferroelectric material and a preparation method thereof.The raw materials of the lead-free high-entropy relaxor ferroelectric material comprise ceramic powder and oxide; the chemical general formula of the ceramic powder is (1-x) (Bi < 0.2 > Na < 0.2 > Ba < 0.2 > Sr < 0.2 > Ca < 0.2 >) TiO < 3-x > La (Mg < 1 / 2 > Zr < 1 / 2 >) O3. The ceramic powder is prepared through a high-entropy strategy, a slender ferroelectric hysteresis loop is obtained at the room temperature, the breakdown field strength of the material is obviously improved, meanwhile, high energy storage density and energy storage efficiency are obtained, the energy storage density reaches 13.5 J cm <-3 >, the energy storage efficiency is 94.6%, and the breakdown electric field reaches up to 750 kV cm <-1 >. According to the material design based on the high-entropy strategy, the relaxation characteristic of the material is remarkably improved, the dielectric loss of the ceramic is effectively reduced, and the practical application potential is shown.

The invention discloses a blended relaxor ferroelectric polymer super-ion solid electrolyte and preparation and application thereof, the super-ion solid electrolyte comprises a polymer matrix, a lithium salt and a relaxor ferroelectric polymer, the mass ratio of the relaxor ferroelectric polymer to the polymer matrix is 1: 1-20, and the lithium salt accounts for 1-80 wt% of the total weight of the solid electrolyte. According to the super-ion solid electrolyte, the relaxor ferroelectric polymer is added to be combined with the polymer matrix, the relaxor ferroelectric polymer can regulate and control the crystal phase component and structure of the polymer matrix, the electrolyte is endowed with relaxor ferroelectric characteristics, the dielectric constant is improved, and dissolution of lithium salt in the polymer matrix is further promoted; lithium ions can be quickly conducted, and the conductivity of the electrolyte and the cycle performance of the battery are effectively improved, so that the solid electrolyte has relatively high mechanical strength, electrochemical stability, interfacial compatibility and room-temperature ionic conductivity.

The invention relates to a flame detector based on a high curie point relaxor ferroelectric single crystal. The flame detector comprises a shell, a bottom plate, a shell cover, a PCB group, a main control module and an infrared sensor, the bottom plate and the shell cover are installed at the two ends of the shell respectively, the PCB set is arranged in the shell and is of a multi-layer structure, the main control module and the infrared sensor are connected with each other and are fixed to the PCB set respectively, and the optical lens is installed on the shell cover; the infrared sensor is a relaxor ferroelectric single crystal pyroelectric sensor, the chemical composition of the relaxor ferroelectric single crystal of the infrared sensor is (1-x-y) Pb (In1 / 2Nb1 / 2) O < 3-y > Pb (Mg1 / 3Nb2 / 3) O < 3-x > bTiO < 3-z > Mn, x is equal to 0.20-0.40, y is equal to 0.18-0.60, and z is equal to 0.003-0.03. Compared with the prior art, the system has the advantages of high anti-interference capability, long detection distance and the like.

The invention discloses a lead-free piezoelectric perovskite ceramic material and a preparation method thereof, and belongs to the technical field of piezoelectric ceramic dielectric materials. Bi (Zn2 / 3Nb1 / 3) O3 is introduced into (Ba0. 85Ca0. 15) (Zr0. 1Ti0. 9) O3 lead-free relaxor ferroelectric ceramic to prepare the lead-free piezoelectric perovskite ceramic material, the chemical composition general formula of the lead-free piezoelectric perovskite ceramic material is (1-x) (Ba0. 85Ca0. 15) (Zr0. 1Ti0. 9) O3-xBi (Zn2 / 3Nb1 / 3) O3, and the value range of x is 0.001-0.0125. According to the invention, Bi (Zn2 / 3Nb1 / 3) O3 is doped, so that the lead-free piezoelectric perovskite ceramic material generates a micro domain, and relatively high piezoelectric property and excellent light transmittance are obtained.

This invention discloses a superparaelectric perovskite ceramic material with A and B site components, its preparation method, and its application. The chemical formula of the superparaelectric perovskite ceramic material with A and B site components is (Ba 1 / 3 Sr 1 / 3 Ca 1 / 3 (Sn) x Ti 1‑x O3, where 0.1≤x≤0.3, the superparaelectric perovskite ceramic material of the A and B sites of the present invention can be used to prepare relaxor ferroelectric materials with good energy storage performance, which meets the current requirements for lead-free production, is environmentally friendly, has a simple process and stable performance, and is conducive to large-scale production.

The present invention provides a sodium bismuth titanate-based relaxor ferroelectric ceramic with excellent energy storage performance under high electric fields and a preparation method thereof, belonging to the field of dielectric energy storage materials; its chemical composition is (1-x)Bi 0.375 Na 0.375 Ba 0.25 TiO3-xNaNbO3, where 0.09 ≤ x ≤ 0.15. The sodium bismuth titanate-based energy storage ceramic material provided by the present invention can exhibit excellent energy storage performance with W rec = 15.2 J / cm 3 , η = 91% under a high electric field of 73 kV / mm, and also has good frequency stability, temperature stability and anti-fatigue characteristics, and it also shows an ultra-fast charge-discharge rate in the over-damped charge-discharge test. The present invention is expected to be practically developed in the fields of electric vehicles, microelectronics, etc.

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 provides a lead-free relaxor ferroelectric solid solution and a preparation method thereof. The chemical composition of the lead-free relaxor ferroelectric solid solution is 0.9((1-x)BaTi 0.8 Zr 0.2 O3-xBa 0.65 Sr 0.35 TiO3)-0.1BaTiO3-y% MgO, wherein x represents a molar coefficient, y represents a mass fraction, 0.2<=x<=0.8, and 0 In the application, BZT, BST and BT ferroelectric bodies are combined, the BT ferroelectric body with high polarization intensity is introduced to improve the polarization behavior of the ceramic, and the electric calorimetric variation, the energy storage density and the pyroelectric current of the system are significantly improved; the MgO nano powder is introduced at the interface of the ternary combined lead-free relaxor ferroelectric solid solution, a barrier layer can be formed and an electric field amplification effect can be generated, so that the breakdown field strength is increased, and the electric calorimetry and the energy storage characteristics are improved.

The present invention discloses a high-field high-dielectric energy storage relaxor ferroelectric ceramic material and a preparation method thereof. The chemical formula of the ceramic material is: xBi 0.5 Na 0.5 TiO3 - ySrTiO3 - zNaNbO3, where x + y + z = 1, 0.4 ≤ x < 0.6, 0.4 < y ≤ 0.6, 0 < z ≤ 0.2. The present invention adopts a solid-phase method to prepare the relaxor ferroelectric ceramic material, with a simple process flow, high preparation efficiency and low cost. The relaxor ferroelectric ceramic material provided by the present invention is lead-free, environmentally friendly and has excellent performance. Its dielectric constant is as high as 856 under an external electric field of 270 kV / cm, and at the same time, the discharge energy storage density is 4.11 J / cm 3 , and the energy storage efficiency is 90.1%, which is very suitable for a high-field working environment.

This application relates to a relaxor ferroelectric piezoelectric ceramic material, its preparation method, and its application, belonging to the field of piezoelectric ceramic technology. The method includes: obtaining a ceramic precursor powder after pre-firing, grinding, and drying; preparing the ceramic precursor powder into a casting slurry to form a ceramic green sheet; printing internal electrodes on the ceramic green sheet and performing lamination pressing to obtain a laminated green sheet; hot-cutting the ceramic green sheet to obtain the ceramic green sheet, wherein the internal electrode is an Ag-Pd-Cu ternary metal system, with Ag at 80-90 wt%, Pd at 5-15 wt%, and Cu at 3-8 wt%; performing staged atmosphere co-firing treatment; and performing electrode connection and polarization treatment on the sintered ceramic to obtain a laminated piezoelectric ceramic device. This application synergistically controls the composition of the internal electrode and the sintering atmosphere path, improving the bonding performance of the ceramic-electrode interface, reducing thermal stress concentration, and enhancing the stability and reliability of the laminated piezoelectric ceramic during polarization and use.

The invention discloses a sodium bismuth titanate-based relaxor ferroelectric ceramic material and a preparation method thereof. The chemical formula of the ceramic material is y [(1-x) Bi < 0.5 > Na < 0.5 > TiO < 3-x > Ba < 0.7 > Sr < 0.3 > TiO < 3 >]-(1-y) Ba (Mg < 1 / 3 > Nb < 2 / 3 >) O < 3-z > wt% MO, 0.4, 0.5 < = y < lt >; 1, 0lt; z < = 10; mO is an acidic, amphoteric or low-melting-point oxide; according to the invention, by introducing Ba0. 7Sr0. 3TiO3 and Ba (Mg1 / 3Nb2 / 3) O3, the relaxation characteristic of a system is enhanced, and relatively high energy storage density and efficiency are obtained; particle rearrangement is promoted by using a cold sintering process, atomic clusters or ions in a saturated state can be migrated to pore positions with relatively low chemical potential in a dissolution-precipitation process, the densification process of a ceramic system is remarkably promoted, and the prepared ceramic shows excellent dielectric temperature stability and energy storage efficiency.

The invention relates to the technical field of energy storage ceramic materials, in particular to a lead-free relaxor ferroelectric ceramic material and a preparation method and application thereof. The composition of the ceramic material has the following chemical formula: (SrxCayBiz) TiO3 + nM, in the formula, x, y, z and n are atomic numbers, x + y + 3z / 2 = 1, and n is greater than 0 and less than or equal to 0.5; m is a metal oxide. According to the ceramic material, through the multi-scale collaborative design of'ion doping-defect regulation and control-domain structure engineering ', the ceramic material has the characteristics of ultralow loss and quick response while keeping a high dielectric constant, and can have the cycle service life of more than 100 thousand times.

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 present invention relates to a bismuth titanate niobate-based relaxor ferroelectric ceramic material for energy storage, a preparation method thereof and an application thereof. The relaxor ferroelectric ceramic material has the general formula Bi 3‑x La x TiNbO9, 0≤x≤1.1; this relaxor ferroelectric ceramic material is prepared by lanthanum-doping Bi3TiNbO9 using a solid-phase sintering method; the lanthanum doping is performed with lanthanum oxide. The present invention has the advantage that the resulting bismuth titanate niobate-based relaxor ferroelectric energy storage ceramic material effectively overcomes the low energy storage density and efficiency of conventional ferroelectric materials, especially bismuth layered ferroelectric materials, making the energy storage performance of the present invention significantly superior to that of undoped bismuth titanate niobate ferroelectric ceramics and other bismuth layered ferroelectric ceramic materials, while also having better working environment stability. The preparation method of the present invention is simple, the raw materials are readily available, and the production efficiency is high, making it suitable for large-scale practical production applications.

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 present invention provides a preparation method for a high-temperature piezoelectric ceramic with large electrostrictive strain under a low driving electric field. BaCO3, TiO2, SnO2, and MnO2 are proportioned according to the chemical formula Ba(Sn 0.11 Ti 0.89 )O3, and 0.6 wt.% MnO2 is added. After ball milling and sieving, sintering is carried out at 1080 - 1120 °C. After ball milling again, granulation is performed, and then sintering is carried out at 1360 - 1400 °C. BaCO3, TiO2, HfO2, Fe2O3, Fe3O4, Bi2O3, SrCO3, and La2O3 are proportioned according to the chemical formula 0.679BiFeO3 - 0.291BaHf 0.05 Ti 0.95 O3 - 0.03(La 0.1 Sr 0.8 )TiO 3‑δ . After proportioning, ball milling, and drying, pre-sintering is carried out at 780 - 820 °C. After ball milling again, granulation is performed, and then sintering is carried out at 1060 - 1100 °C. 3 - 9% of the second ferroelectric phase is added to 91 - 97% of the relaxor ferroelectric matrix phase by weight percentage. After ball milling, drying, granulation, tabletting, and finally sintering. The present invention can prepare a 0-3 type composite piezoelectric ceramic with excellent electrostrictive strain performance under a low driving electric field.

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.

The application relates to a lead-free ceramic and a preparation method and a capacitor thereof, and belongs to the technical field of ceramics; BKT ceramic is solid-solved into ST ceramic, the paraelectric phase in the ST ceramic is broken by introducing the BKT ceramic, and the relaxation characteristic is improved. Meanwhile, BZT ceramic is introduced, the sintering temperature of the whole body is reduced, and then the probability of forming a liquid phase of the ceramic during sintering is reduced. The introduction of the BZT ceramic can make the micro-ordering of the ceramic become disordered, finally forming a bicrystal site disordered relaxor ferroelectric, and then being beneficial to the power density of the lead-free ceramic. In addition, the grain size of the BKT ceramic is small, the reduction of the grain size reduces the number of oxygen vacancies, the oxygen vacancies are oxidized again in the sintering process, the oxygen vacancies are further reduced, the grain growth is inhibited by the fewer oxygen vacancies, finally leading to the reduction of the grain size, more grain boundaries can be formed, so that the lead-free ceramic has a higher breakdown field strength and is beneficial to the improvement of the energy storage performance of the material.

The present invention belongs to the technical field of ceramics, and discloses a sodium bismuth titanate-based lead-free relaxor ferroelectric ceramic with high energy storage, its preparation method and application. The chemical formula of the ferroelectric ceramic is (1-x)(0.7Na 0.5 Bi 0.5 TiO3 - 0.3Sr 0.7 Bi 0.2 TiO3) - xBi(Mg 0.5 Zr 0.5 )O3, where 0 < x ≤ 0.18. This ceramic has good temperature stability, frequency stability, a large saturation polarization intensity, a low remanent polarization intensity, and a higher breakdown field strength. The energy storage density of the ferroelectric ceramic of the present invention is 4.7 J / cm 3 or more, and the energy storage efficiency is 75% or more, which is suitable for high-power pulse devices.

The invention provides a large-strain flexible ferroelectric composite film, a preparation method thereof and an electrostrictor, and the large-strain flexible ferroelectric composite film comprises a flexible piezoelectric polymer film, a 0-3 type organic / inorganic composite film, an anti-ferroelectric film, a 0-3 type organic / inorganic composite film and a flexible piezoelectric polymer film which are sequentially stacked. Wherein the flexible piezoelectric polymer film is a film formed by a relaxor ferroelectric polymer, the anti-ferroelectric film is a film formed by an anti-ferroelectric material, and the 0-3 type organic / inorganic composite film is a film formed by compounding the relaxor ferroelectric polymer and the anti-ferroelectric material. The large-strain flexible ferroelectric composite film disclosed by the invention has the characteristics of high flexibility and large electrostrictive strain, and the adaptive bending radius can reach hundreds of microns to millimeter magnitude.

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 invention relates to the technical field of ferroelectric liquid crystals, in particular to a relaxor ferroelectric / anti-ferroelectric liquid crystal material and a preparation method and application thereof. The relaxor ferroelectric / anti-ferroelectric liquid crystal material provided by the invention retains the ferroelectricity of ferroelectric nematic phase liquid crystal, generates isotropic-ferroelectric phase transition at 43.3 DEG C, and shows the specific ferroelectric hysteresis loop and dielectric relaxation behavior of the relaxor ferroelectric.

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.