16 results about "Sodium niobate" patented technology

The invention relates to a high-entropy ceramic capacitor, a ceramic dielectric material for the high-entropy ceramic capacitor and a preparation method, the raw material composition of the ceramic dielectric material comprises NaNbO3, (Na0. 2Bi0. 2Ba0. 2Mg0. 2Zn0. 2) TiO3, H3BO3, CaZrO3 and the like, by controlling the raw material ratio and preparation process parameters of sodium niobate and adopting a multi-step grinding synthesis method, NaNbO3-based high-entropy ceramic is designed, so that the insulation resistance of the high-entropy ceramic capacitor is effectively improved; on the other hand, chemical modification treatment is carried out by introducing (Na0. 2Bi0. 2Ba0. 2Mg0. 2Zn0. 2) TiO3, H3BO3, CaZrO3 and the like, so that the structural stability of an antiferroelectric phase is enhanced, the compactness of the material is improved, and finally, the energy storage performance of the material is optimized and improved.

The application relates to the technical field of piezoelectric ceramic devices, and particularly discloses a super-high inverse piezoelectric performance anti-reduction sodium potassium niobate-based lead-free piezoelectric ceramic with a chemical formula of (1-x)(Na 1‑y K y ) z Nb 1‑h Ta h O3-xAZr t O3+i% M+k% N, wherein x, y, z, h, t, i and k represent molar fractions, 0.04<=x<0.08, 0.45

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.

This invention relates to the field of piezoelectric materials and discloses a method for preparing a potassium sodium niobate thin film. The method involves first synthesizing a ceramic target material from niobium pentoxide, potassium carbonate, and sodium carbonate in a solid phase; then placing the ceramic target material in a magnetron sputtering apparatus for sputtering to form an amorphous thin film; finally, adding the amorphous thin film to an annealing atmosphere in a crucible for annealing to form a potassium sodium niobate thin film. This method uses magnetron sputtering to prepare an amorphous potassium sodium niobate thin film under conditions below the film crystallization temperature, followed by annealing to crystallize the film. During annealing, an alkali metal atmosphere is used to compensate and control the alkali metal elements in the film. This method is still based on magnetron sputtering, which is suitable for large-size thin film growth, offering strong process controllability and high production efficiency. The alkali metal atmosphere compensation allows for control of the alkali metal element composition in the potassium sodium niobate.

The invention relates to a high-energy-storage sodium niobate-based temperature-stable ferroelectric multilayer energy-storage ceramic capacitor and a preparation method thereof, the chemical general formula of the capacitor is (Na < 0.75-x > Bi < 0.125 > Li < 0.125 > Nb < 0.75-xy-xz > Ti < 0.25 >)-xBa (PyQz) O3, x is more than or equal to 0.01 and less than or equal to 0.06, and x is more than or equal to 0.01 and less than or equal to 0.06. Y is greater than or equal to 0.01 and less than or equal to 0.02; the value range of z is more than or equal to 0.01 and less than or equal to 0.04, P is one or a combination of more than one of Mg, Ni, Ta and Sb, Q is one or a combination of more than one of Mn, Nb and Zr, the average grain size of the energy storage ceramic capacitor is in a micron order, the average thickness of the dielectric layer is 8-15 microns, and the capacitor can release energy storage density (Wrecc) gt; the energy storage efficiency (eta) is greater than 85%; the change rate of Wrec and eta in the test temperature range of 20-200 DEG C is less than 8%; and the change rate of Wrec and eta in the test frequency range of 0.5-240 Hz is less than 6%.

The invention discloses a sodium niobate-based ferroelectric ceramic and a preparation method thereof, and belongs to the field of dielectric ceramics. The chemical composition general formula of the sodium niobate-based ferroelectric ceramic is (Na < 0.874-0.874 x > Yb < 0.0085-0.0085 x > Tm < 0.0085-0.0085 x > Bi < 0.075-0.75 x > Ba < 0.5 a > Sr < 0.5 b >) (Nb < 0.85-0.85 x > Ti < 0.15-0.15 x > Sn < 0.5 c > Hf < 0.5 d >) O3, a = b = c = d, and x is greater than or equal to 2 and less than or equal to 6; the ceramic is of an ABO3 type perovskite structure, and in the ABO3 type perovskite structure, Bi ions are in a compound occupation form in which the A site and the B site coexist. The preparation method comprises the following steps: (1) proportioning and refining to obtain mixed powder; (2) performing pre-synthesis and powder treatment to obtain uniform powder; (3) preparing a molded green body; (4) removing organic matters; and (5) densifying and sintering to obtain the ferroelectric ceramic. The sodium niobate-based ferroelectric ceramic provided by the invention can achieve the effects of high Wrec, high eta, wide temperature range and excellent stability at the same time.

This invention discloses a polyimide-potassium sodium niobate composite film, its preparation method, and a piezoelectric nanogenerator, belonging to the field of nanogenerator technology. The method includes: ball milling and mixing Nb₂O₅, Na₂CO₃, and K₂CO₃ until uniform and drying; grinding, sieving, calcining, and grinding again to obtain potassium sodium niobate ceramic nanoparticle fillers; mixing anhydrous N,N-dimethylformamide solution and 4,4'-diaminodiphenyl ether powder until uniform; adding pyromellitic dianhydride powder in multiple batches; stirring thoroughly after reaction; adding potassium sodium niobate ceramic nanoparticle fillers; repeated ultrasonication and stirring; heating and stirring reaction; casting; vacuum drying; gradient temperature calcination; and cooling to obtain a polyimide-potassium sodium niobate composite film; the assembled piezoelectric nanogenerator combines... d 31 and d 33 With dual operating modes, it can collect and utilize micro-energy in various application environments, and its power density is significantly enhanced compared to the traditional single operating mode; it also maintains excellent operating stability at a high temperature of 150℃.

The invention discloses sodium niobate-based ceramic for identifying lattice distortion and a preparation method of the sodium niobate-based ceramic, and belongs to the field of inorganic functional ceramic materials. The chemical general formula of the sodium niobate-based ceramic is (1-x) [0.85 (Na0. 94YbaTmb) NbO3-0. 15 (Bi0. 5Na0. 5) TiO3]-x (Ba0. 5Sr0. 5) (Sn0. 5Hf0. 5) O3, 0.01 < = alt, 0.01 < = alt, 0.01 < = alt, 0.01 < = alt, 0.01 < = alt, 0.01 < = alt, 0.01 < = alt, 0.01 < = alt, 0.01 < 0.02, 0.01 < = blt; 0.02 < = x < = 0.06. The preparation method comprises the following steps: (1) burdening and primarily mixing to obtain primarily mixed powder; (2) pre-sintering the primarily mixed powder, and mixing again to obtain uniform powder; (3) carrying out compression molding on the uniform powder; (4) removing organic matters; and (5) sintering to obtain the sodium niobate-based ceramic. The sodium niobate-based ceramic provided by the invention can realize lossless and high-spatial-resolution distortion detection, and achieves the effect of high sensitivity.

This invention discloses a hard sodium potassium niobate lead-free piezoelectric ceramic and its preparation method. The lead-free piezoelectric ceramic is based on sodium potassium niobate ceramic by introducing two metal oxides, CuO and MnO2. The preparation method involves synthesizing sodium potassium niobate ceramic powder, then introducing CuO and MnO2, followed by secondary ball milling, drying and sieving, dry pressing, and sintering. This successfully prepares a hard sodium potassium niobate lead-free piezoelectric ceramic with high piezoelectric constant, low loss, and high mechanical quality factor. d 33 It is 335 pC / N. k p Reaching 0.51, Q m For 363, tan d =0.0103. The introduction of bimetallic cation doping not only ensured sintering quality but also effectively improved [the quality] through defect design. Q m This achieves the effect of hardening ceramics.

The invention discloses sintering furnace equipment and a sintering method of a potassium-sodium niobate-based lead-free piezoelectric ceramic piece, and belongs to the technical field of lead-free piezoelectric ceramic preparation. A crucible with a downward opening is arranged in a hearth of the sintering furnace equipment, and a closed space is formed by the crucible and the bottom of the hearth. A sagger with an upward opening is arranged in the closed space, and a clamping device is arranged in the sagger and used for clamping sintering raw materials. According to the sintering furnace equipment, a stable temperature field in the sintering process is kept through the common design of the saggar and the crucible, excessive volatilization of potassium and sodium can be restrained when the potassium-sodium niobate-based leadless piezoelectric ceramic piece is prepared, and the prepared potassium-sodium niobate-based leadless piezoelectric ceramic piece is excellent in performance and good in appearance.

The invention discloses an environment-friendly lead-free halogen-free piezoelectric ceramic electroacoustic component and a manufacturing method thereof, the principal crystalline phase of a piezoelectric ceramic material forming the component is modified potassium sodium niobate-based ceramic, and the chemical general formula of the piezoelectric ceramic material is as follows: the components are proportioned according to the following proportion range: 0.4 < = 0.60; 0.90 < = < = 1.05; 0.04 < = < 0.08; or and; or and; or and; the material is free of heavy metals and halogen compounds. The environment pollution is avoided in the whole life cycle from production to discarding, the human health is guaranteed, the problem of insufficient performance of a traditional lead-free material is solved, the difficulty and the cost of large-scale production are reduced, the composite material is adaptive to a complex working environment, and the adaptability of an application scene is improved.

The invention discloses a gel polymer electrolyte based on a three-layer asymmetric gradient structure as well as a preparation method and application of the gel polymer electrolyte, and relates to the technical field of electrolyte materials of high-voltage lithium metal batteries. The gel polymer electrolyte comprises a three-layer structure of a cathode side layer, a middle layer and an anode side layer which are sequentially stacked, the three-layer structure takes polyvinylidene fluoride-hexafluoropropylene copolymer as a matrix and realizes functional partition through gradient doping of inorganic filler, and the inorganic filler is sodium niobate nanoparticles and gamma-Al2O3 particles; the components of each layer are accurately regulated and controlled, collaborative optimization of a lithium metal anode-electrolyte-high-voltage cathode interface and mechanical strength is realized, ohmic polarization and concentration polarization are reduced through a gradient structure, the ion transmission efficiency is improved, and the performance of the lithium ion battery is improved. The problems that an electrolyte in an existing high-voltage lithium metal battery is insufficient in electrode-electrolyte interface stability, poor in ion transport kinetics, weak in mechanical property, potential in safety hazard and the like are solved.

The application relates to the field of antiferroelectric ceramic materials and discloses a lead-free antiferroelectric ceramic, a preparation method and application thereof. The chemical composition of the ceramic is (1-x-y)NaNbO3-xABO3-yLa2O3-zMnO2, wherein A is one of Ca, Sr and Ba, B is one of Hf, Zr, Sn and Ti, 0.1<=x<=0.2, 0.05<=y<=0.1 and 0.01<=z<=0.03. The ceramic is a sodium niobate-based antiferroelectric ceramic. The capacitance density of the ceramic increases with the increase of an applied electric field intensity (0-20 kV / mm). The maximum capacitance density change amplitude of a pulse capacitor element made of the ceramic is less than 8% with the increase of working temperature under alternating-current and direct-current coupling electric field (alternating-current electric field 8-10 kV / mm and direct-current electric field 18-20 kV / mm), and the temperature stability of the lead-free antiferroelectric ceramic is significantly increased.

The invention relates to a sodium niobate-lithium bismuth titanate-ternary multilayer energy storage ceramic capacitor and a preparation method thereof, and belongs to the field of functional ceramic materials. The chemical formula of the energy storage ceramic is (0.68-x) NaNbO3-0. 32 (Bi0. 5Li0. 5) TiO3-xABO3, x represents molar percentage, the value of x meets electric neutrality, x is more than 0 and less than or equal to 0.05, an A-site ion in the third-element ABO3 is one of Na < + >, Bi < 3 + >, Li < + > and Ba < 2 + >, and a B-site ion in the third-element ABO3 is one of Nb < 5 + >, Ti < 4 + > and Zr < 4 + >. When an electric field of 15 kV / mm is externally applied, the energy storage density of 0.99 J / cm < 3 > and the energy storage efficiency of 90.37% are obtained by the multilayer energy storage ceramic capacitor.

This invention provides an orange-red sodium niobate-calcium titanate stress luminescent material and its preparation method. The material is composed of a mixture of phosphor and resin, wherein the phosphor has the chemical formula: Na... 0.985‑x Ca x Pr 0.005 Nb 1‑x Ti x O3, where x represents the mole fraction, 0.01 ≤ x ≤ 0.09. Its preparation method is as follows: 1) Mix Na2CO3 and Pr6O... 11 The process involves: 1) Using CaCO3, TiO2, and Nb2O5 as raw materials, mixing them according to their chemical formulas, ball milling, drying, first firing, first grinding, second firing, and second grinding to obtain phosphor; 2) Mixing epoxy resin and alicyclic amine according to a specific ratio to obtain a resin mixture; 3) Allowing the phosphor and resin mixture to stand, drying, and demolding to obtain the stress-luminescent material. The stress-luminescent material prepared by this invention exhibits excellent luminescent properties.

This invention relates to the field of piezoelectric ceramics technology, and more particularly to a lead-free potassium sodium niobate-based piezoelectric ceramic and its preparation method. The piezoelectric ceramic is composed of alternating layers of p-type and n-type components, and its general chemical composition is: 0.94(Na...) 1‑y K y ) 1‑z Nb 1‑h Ta h O3-0.06A i B k O3+8%N. This invention constructs a stable, strong built-in field for sodium potassium niobate-based ceramics, exciting the material's domain response. This enables the reduction-resistant sodium potassium niobate-based lead-free piezoelectric ceramics to exhibit an ultra-high voltage strain coefficient under a low driving electric field, with an electrostrain coefficient far exceeding that of current mainstream lead-based piezoelectric materials. The fabrication process meets the requirements for multilayer devices co-fired with nickel electrodes. After fabrication into multilayer devices, it can effectively reduce the electrode cost of lead-free piezoelectric multilayer devices by more than 90%.