52 results about "Potassium niobate" patented technology

The piezoelectric ceramic according to the present disclosure includes, as a main component, a sodium potassium niobate-based composition. The composition is represented by general formula (1). General formula (1): {(K1-a-bNaaLib)1-c-dA1cA2d} x {(Nb1-e- fTaeSbf)1-g-hB1gB2h}O3. Further, the piezoelectric ceramic according to the present disclosure contains, with respect to 100 parts by mass of the abovementioned composition, Mn in the amount of 0.05 to 3.50 parts by mass in terms of MnO2.

The invention relates to the technical field of photocatalysis, in particular to a copper and titanium co-doped potassium niobate photocatalytic material and a preparation method thereof. Potassium niobate is partially substituted in the synthesis stage of potassium niobate through a hydrothermal method, the crystal structure of potassium niobate can be kept stable after doping, the light absorption range is widened, and the photocatalytic efficiency is improved. Other potassium niobate doped photocatalytic materials are difficult to consider both the performance and the practicability due to the problems of structural defects, charge imbalance, insufficient light absorption or poor stability and the like. Cu-Ti co-doping achieves breakthrough in the aspects of band gap regulation and control, charge separation and structural stability through a complementary mechanism, the peak value of transient photocurrent response and steady-state output are remarkably improved, and the optimal solution of potassium niobate modification is achieved.

An object of the present disclosure is to provide a dense potassium sodium niobate sintered body and a sputtering target capable of producing a thin film having a desired composition and crystal phase. A potassium sodium niobate sintered body containing potassium (K), sodium (Na), niobium (Nb), and oxygen (O) satisfies 1 < (K+Na) / Nb ≤ 1.3 in terms of atomic ratio, and has a dimensional density of 3.9 g / cm 3 The above.

The invention discloses a magnetic element modified potassium niobate-based spiral electric polarization ceramic and a preparation method thereof. The chemical composition is (1-x) KNbO3-xFe2O3, wherein x is more than or equal to 0.0005 and less than or equal to 0.002. The preparation method comprises the following steps: weighing K2CO3, Nb2O5 and Fe according to a stoichiometric ratio, grinding, pre-sintering and ball-milling to obtain raw material powder, pressing the powder into sheets by using a mold, and sintering at 1030-1040 DEG C for 2 hours to obtain the iron element modified potassium niobate-based ceramic. The preparation method disclosed by the invention is simple in preparation steps, green, friendly and high in repeatability, has a spiral electric polarization characteristic similar to that of a liquid crystal material, and has the comprehensive performance ranges of high energy storage efficiency of 96.60-97.87% and breakdown field strength of 110-440kV / cm under different proportions. The lead-free functional inorganic material has great commercial application value.

This piezoelectric element comprises a columnar laminate and two conductor layers. In the columnar laminate, internal electrodes and a piezoelectric body having potassium sodium niobate as the main component are alternately laminated. The two conductor layers are positioned on the respective lateral surfaces of the laminate and are connected to the corresponding internal electrodes. The piezoelectric body has a first portion and a second portion. The first portion overlaps the internal electrodes in a planar perspective view in the lamination direction. The second portion is located outside the first portion and does not overlap the internal electrodes in the planar perspective view. The concentration of at least one of potassium and sodium contained in the piezoelectric body is constant in the first portion, decreases stepwise at the interface between the second portion and the first portion, and decreases gradually from the interface to the surface in the second portion.

The present application relates to the technical field of photoelectric functional crystal materials, in particular to a preparation method of tetragonal transparent potassium tantalum niobate crystal, comprising the following steps: (1) plating electrodes on the surface of the crystal; (2) controlling the temperature of the potassium tantalum niobate crystal with plated electrodes to be within the range of 2-6 ℃ below the Curie point and keeping it constant all the time; (3) polarizing the crystal by applying an alternating electric field under ultraviolet laser irradiation to obtain the tetragonal transparent potassium tantalum niobate crystal. The potassium tantalum niobate crystal prepared by the method can maintain a transparent state for a long time without a large thermal shock, solving the problem that the tetragonal potassium tantalum niobate crystal cannot be applied in the field of electro-optical modulation due to low light transmittance, and also solving the problem of light scattering caused by micro-domain walls of the cubic potassium tantalum niobate crystal near the Curie point.

A polymer composite having piezoelectric properties that can be formed for flexible and / or thin film applications, where the polymer composite includes a polymer matrix and a piezoelectric ceramic filler embedded in the polymer matrix. The polymer matrix can include at least two polymers: a first polymer and a second polymer. The first polymer can be a fluorinated polymer and the second polymer can be compatible with the first polymer and have a dielectric constant less than about 20. The piezoelectric ceramic filler can be lithium-doped potassium sodium niobate (KNLN) and can be about 40-70 vol% of the polymer composite. The remaining 30-60 vol% can be the polymer matrix, which itself can be about 5-20 wt% of the second polymer and 80-95 wt% of the fluorinated polymer.

The present application relates to a potassium sodium niobate based textured piezoelectric ceramic with high Curie temperature and temperature stability, and a preparation method thereof, the textured piezoelectric ceramic has a general chemical formula of (0.99-x)((K 0.5 Na 0.5 )(Nb 0.98 Ta 0.02 )O3)‑0.01(Bi(Ni 0.67 Nb 0.33 )O3)‑x(Bi 0.5 K 0.5 )HfO3+3wt.%NaNbO3, 0≤x≤0.04; the method comprises a solid phase synthesis method, a two-step molten salt method combined with a separation method, a template grain growth method, a casting process, a hot pressing process, a glue removal process, a two-step sintering process, a silver sintering process and a polarization process. Compared with the prior art, the present application can obtain a lead-free textured piezoelectric ceramic with high Curie temperature and high piezoelectric performance by the solid phase synthesis method, the template grain growth method combined with the casting process and the two-step sintering process, more importantly, the ceramic exhibits a single tetragonal phase structure, has high positive and inverse piezoelectric coefficients, and the piezoelectric coefficient and the inverse piezoelectric coefficient have small change rates in a wide temperature range, and has excellent temperature stability.

The application discloses a kind of biphasic bioactive tissue repair scaffolds and preparation method, comprising the following steps: step 1: calcium phosphate ceramic powder is modified on surface, and the modified calcium phosphate ceramic powder is obtained;Step 2: the modified calcium phosphate ceramic powder, potassium sodium niobate piezoelectric ceramic powder, dispersing agent, photoinitiator, photosensitive resin are mixed evenly, and the light-cured resin slurry is obtained after ball milling;Step 3: according to the design, 3D printing model is constructed, and the light-cured resin slurry is printed according to 3D printing model, and the scaffold body can be obtained;Step 4: scaffold body is cleaned, and the required scaffold can be obtained after defatting sintering;The application can prepare biphasic bioactive tissue repair scaffold with good mechanical properties, efficient antitumor ability and better bone regeneration capacity, and provide technical support for the repair of bone tumor postoperative bone defect in clinic.

This invention provides a modified ferroelectric polymer composite film, its preparation method, and its applications, belonging to the field of piezoelectric composite material technology. The modified ferroelectric polymer composite film includes a ferroelectric polymer base film and a plurality of composite nanoparticles and multi-walled carbon nanotubes dispersed within the ferroelectric polymer base film. The composite nanoparticles have a core-shell structure, comprising a core and an inner shell layer and an outer shell layer sequentially surrounding the core. The core comprises a composite piezoelectric ceramic material composed of potassium sodium niobate and barium titanate, the inner shell layer comprises polydopamine, and the outer shell layer comprises MnO2. This invention fully utilizes the synergistic effect of the composite nanoparticles and multi-walled carbon nanotubes on the dielectric and piezoelectric properties of P(VDF-TrFE) materials, thereby preparing a composite material with high dielectric constant, low dielectric loss, and excellent piezoelectric properties to meet the stringent performance requirements of high-performance sensors and other application fields.

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 relates to a potassium-sodium niobate-based lead-free piezoelectric ceramic, the components of the potassium-sodium niobate-based lead-free piezoelectric ceramic are (1-x)K 0.48 Na 0.55 Bi a Nb 0.96 Zr b Sb c O3-a-b-c-CuOx; wherein 0.01<=a<=0.08, 0.02<=b<=0.08, 0.02<=c<=0.08, 0.001<=x<=0.2, x represents the molar fraction of CuO, the application can effectively improve the ceramic oxygen vacancy concentration and enhance the pinning effect of the ceramic ferroelectric domain wall by regulating the proportion of copper oxide, so that a potassium-sodium niobate-based lead-free piezoelectric ceramic with moderate d 33 And high mechanical quality factor Qm is obtained, which is expected to be applied in the field of lead-free medium-power piezoelectric devices. In addition, the process for preparing the potassium-sodium niobate-based lead-free piezoelectric ceramic is simple, the cost is low, and the application has the potential for industrial application.

The invention relates to the field of dielectric energy storage ceramic materials, in particular to potassium-sodium niobate-based energy storage ceramic as well as a preparation method and application thereof. The chemical composition of the potassium-sodium niobate-based energy storage ceramic comprises (1-x) (0.55 K0. 5Na0. 5NbO3-0.45 BaTiO3)-x (Bi0. 5yNa0. 5 + y) Ti0. 9Zr0. 1O3, x is more than 0 and less than or equal to 0.4, and y is more than or equal to-0.05 and less than or equal to 0.1. The potassium-sodium niobate-based energy storage ceramic still keeps excellent energy storage efficiency while having high energy storage density, and can meet the use requirements to a greater extent, specifically, at the room temperature of 100 Hz, the energy storage density of the potassium-sodium niobate-based energy storage ceramic is 7.02 J / cm < 3 >-10.55 J / cm < 3 >, and the energy storage efficiency is 91.7%-94.2%.

The invention relates to the technical field of thin-film capacitor materials, and discloses a temperature-adaptive thin-film capacitor material and a manufacturing method thereof, and the temperature-adaptive thin-film capacitor material comprises a polyetherimide substrate thin film as a substrate support and barium titanate potassium niobate composite ceramic particles, the barium titanate potassium niobate composite ceramic particles are uniformly distributed in the polyetherimide substrate film in a discrete mode, the polyetherimide substrate film internally contains a dispersing agent and an antioxidant, and the dispersing agent is distributed in a PEI molecular chain of the polyetherimide substrate film and in an interface area of the barium titanate potassium niobate composite ceramic particles. And antioxidant molecules are uniformly embedded among PEI molecular chains of the polyetherimide substrate film and cannot be chemically bonded with PEI and the composite ceramic particles. According to the temperature self-adaptive thin film capacitor material and the manufacturing method, compatibility is improved, agglomeration is prevented, and dielectric loss is reduced; the antioxidant is embedded into a PEI molecular chain, oxidative degradation of the PEI molecular chain is inhibited, long-term stability is guaranteed, loss is reduced, the service life is prolonged, and product consistency is guaranteed.

The application provides a double-rare earth doped photoelectric storage film and a preparation method and application thereof, and the method comprises the following steps: (1) pressing Eu2O3 and Tb4O7 into sheet structures respectively, obtaining Eu2O3 target material and Tb4O7 target material after high-temperature calcination; and placing the Eu2O3 target material and the Tb4O7 target material on a KNN target material to simultaneously perform radio frequency sputtering, and obtaining a photoelectric storage film. The photoelectric storage film of the double-rare earth doped potassium sodium niobate prepared by the application has high transparency, full-waveband fluorescent reading, good stability and bending resistance, and can realize coupling between photochromism and dielectric energy storage in the film material, thereby providing a new opportunity for the application requirement of constructing a future flexible foldable photoelectric storage device.

The invention provides a lead-free piezoelectric ceramic material, a preparation method thereof and a piezoelectric device. The lead-free piezoelectric ceramic material is represented by a chemical general formula as follows: (1-x-y) (K1-aNaa) (Nb1-bMb) O < 3-x > AWO < 4-y > BMoO < 4 >, wherein (K1-aNaa) (Nb1-bMb) O3 represents a potassium-sodium niobate-based ceramic material, a is greater than or equal to 0.4 and less than or equal to 0.6, b is greater than or equal to 0 and less than or equal to 0.1, and M is a doped metal element; x and y are mole fractions and satisfy 0 lt; x is less than or equal to 0.05, 0lt; y is less than or equal to 0.05, and 0 lt; x + y < = 0.1; the AWO4 is tungstate, and the BMoO4 is molybdate. Through the synergistic effect of tungstate and molybdate, the sintering temperature of the lead-free piezoelectric ceramic material is reduced, the piezoelectric constant of the lead-free piezoelectric ceramic material is improved, the dielectric loss of the lead-free piezoelectric ceramic material is reduced, the comprehensive performance of the lead-free piezoelectric ceramic material is greatly improved, and the lead-free piezoelectric ceramic material can be applied to piezoelectric devices such as piezoelectric motors with high requirements for piezoelectric performance.

The invention discloses a melt spinning preparation method of a flexible piezoelectric fiber with a core-sheath structure, and relates to the field of electronic materials and sensors. The problems of rigidity and brittleness of an existing piezoelectric material are solved. The preparation method comprises the following steps: mixing and stirring potassium sodium niobate piezoelectric powder, polylactic acid powder and a titanate coupling agent, banburying at a high temperature, and carrying out melt spinning, evaporation of an external copper electrode and polarization treatment by using a coaxial spinning nozzle and a copper wire to prepare the flexible piezoelectric fiber with a core-sheath structure. The fiber takes potassium sodium niobate as a piezoelectric active material, the core part is a copper wire, the outer layer is an evaporation copper layer with the thickness of 100-200nm, and the diameter is 50-200mu m. An electrode structure can be arranged in the fiber core part, so that an electric signal can be conveniently obtained; and the selected polylactic acid material has degradability and biocompatibility, so that the fiber can be applied to the field of biomedical sensors, is low in treatment difficulty after being discarded, and has wide application prospects in the fields of intelligent fabrics, intelligent robots with bodies and the like.

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 application belongs to the field of functional material preparation, and particularly relates to a Na and Ta co-doped potassium boron niobate antiferroelectric crystal material and a preparation and processing method thereof. 3‑x Na x Nb 3‑y Ta y B2O 12 , wherein x=0.05-0.45, y=0.05-0.5, the Na and Ta co-doped potassium boron niobate antiferroelectric crystal material has a dielectric coefficient increased from 9.85K to 11K at the time of gamma to beta phase transition, and Pmax is increased to 3 times of the original value; through optimization of crystal growth and processing technology, cleavage of the potassium boron niobate antiferroelectric crystal is obviously improved, and no obvious cleavage phenomenon occurs at a temperature of 600 DEG C.

The invention belongs to the technical field of lead-free piezoelectric crystal materials, and particularly relates to a BaMnO2 doped potassium sodium niobate-based single crystal, which has the chemical general formula of (1-x) [(1-y) (K0. 5Na0. 5Nb) O3-yBiFeO3]-xBaMnO2, the invention also discloses a preparation method of the BaMnO2 doped potassium sodium niobate-based single crystal, and the preparation method specifically comprises the following steps: taking Na2CO3, K2CO3, Nb2O5, MnO2, Bi2O3, BaCO3 and Fe2O3 as raw materials, adopting an improved seed-free crystal solid phase growth method, and carrying out primary refining ball milling, pre-sintering, secondary refining ball milling and sintering to obtain the BaMnO2 doped potassium sodium niobate-based single crystal. The BaMnO2 doped potassium sodium niobate-based single crystal provided by the invention has the advantages of high integrity, large size and excellent piezoelectric property.

The application discloses a strontium titanate heterogeneous potassium niobate / fluorine-containing polyimide high-temperature dielectric composite film and a preparation method and application thereof, and relates to the technical field of dielectric materials. The composite film comprises a fluorine-containing polyimide film and strontium titanate heterogeneous potassium niobate nanofibers contained in the fluorine-containing polyimide film; the strontium titanate heterogeneous potassium niobate nanofibers are prepared by spinning a strontium titanate heterogeneous potassium niobate precursor and then calcining. The KN-ST / FPI filler is beneficial to improving the energy storage performance of the FPI nanocomposite material, and the preparation method of the filler is not reported in the prior art, and the method is cheap and easy to obtain.

The application discloses a fine solid-phase sintering method for inhibiting potassium volatilization of potassium niobate ceramic powder, and first, according to the molar ratio of KHCO3:Nb2O5=2-2.02:1, the powder raw materials KHCO3 and Nb2O5 required for preparing different mass of potassium niobate are weighed, and the weighed powder raw materials are subjected to multi-gradient sintering, and according to the quantitative relationship between the mass of the multi-gradient sintered powder raw materials and the sintering time, the potassium niobate powder is preliminarily prepared; then, the preliminarily prepared potassium niobate powder is subjected to second sintering, and the final active potassium niobate powder is obtained; the potassium bicarbonate which is not sensitive to air is used as the raw material to replace the potassium carbonate which is easy to absorb moisture in the air, the volatilization of the K element can be better controlled, the characteristics of the potassium carbonate absorbing moisture and the problem that the prepared potassium niobate ceramic powder deviates from the proportioning are solved; and through controlling the temperature and time when the K element volatilizes, the composition deviation of the potassium niobate caused by the indefinite pre-sintering holding time is avoided, and the powder process for accurately preparing the potassium niobate and other potassium-containing oxide materials is achieved.

A transmission line is disclosed which includes a first conductor, a second conductor, a composite disposed between the first conductor and the second conductor, the composite includes non-linear inclusions comprising one or more of non-linear dielectric and non-linear magnetic inclusions mixed in a matrix material, wherein the non-linear dielectric inclusions are selected from the group consisting of barium strontium titanate (BST), barium titanate, strontium titanate, barium zirconate titanate, lead zirconate titanate, lead titanate, lithium niobate, potassium niobate, lead scandium tantalate, strontium barium niobate, and combinations thereof, and the non-linear magnetic inclusions are selected from the group consisting of nickel zinc ferrite (NZF), manganese zinc ferrite, cobalt ferrite, manganese ferrite, zinc ferrite, nickel ferrite, and combinations thereof, wherein the non-linear inclusions by volume are about 25% NZF, about 10% BST / 15% NZF, and about 15% BST / 10% NZF, and wherein the first conductor, the second conductor, and the composite form a capacitor.

The invention provides a preparation method of composite ion pair modified potassium-sodium niobate ceramic, and relates to the technical field of functional ceramic. The chemical general formula of the composite ion pair modified potassium-sodium niobate ceramic is (K0. 5Na0. 5) 1-x (H-V) xNbO3, H-V is a composite ion pair, x is the mole fraction of the composite ion pair, and 0 lt; x is smaller than or equal to 0.05; the composite ion pair H-V is composed of a positive ion H and an equivalent A-site vacancy V, and is used for jointly replacing A-site (K0. 5Na0. 5) 1 + in the chemical general formula and keeping the electricity price balance of a crystal structure. The potassium-sodium niobate ceramic material disclosed by the invention has excellent piezoelectric property, and the maximum piezoelectric coefficient is about 560 pC / N. The performance index is far superior to the electrical performance of pure potassium sodium niobate ceramic, and is also superior to numerous commercial lead-containing PZT piezoelectric ceramics.

The application discloses a potassium-sodium niobate-based lead-free piezoelectric ceramic material and a preparation method and application thereof, relates to the technical field of functional materials, and has a chemical formula of 0.964K 0.5 Na 0.5 Nb 0.955 Sb 0.045 O3‑0.03Bi 0.5 Na 0.5 ZrO3‑0.006BiFeO3‑xMnO2, wherein x is 0.005-0.04, and x represents a molar fraction. By means of intervention of the oxide sintering aid MnO2, microstructure, compactness, domain structure, phase boundary, loss and defect concentration of the ternary KNN-based piezoelectric ceramic material system are regulated, so that a brand-new potassium-sodium niobate (KNN)-based lead-free piezoelectric ceramic with super-high piezoelectric performance and excellent mechanical performance is obtained.

The invention discloses a piezoelectric composite intravascular stent and a preparation method and application thereof, and belongs to the technical field of biomedical materials and medical instruments.The piezoelectric composite intravascular stent comprises a stent body, and the stent body is of a tubular structure formed by weaving piezoelectric composite fibers; the piezoelectric composite fiber comprises a substrate material and a piezoelectric enhancement component, the substrate material comprises a fluorine polymer piezoelectric material, the piezoelectric enhancement component is lead-free piezoelectric ceramic nanoparticles, and the lead-free piezoelectric ceramic nanoparticles comprise at least one of barium titanate, potassium niobate and zinc oxide. The mass ratio of the lead-free piezoelectric ceramic nanoparticles in the piezoelectric composite fiber is 1%-10%; the stent body can generate output voltage of 50mV-100mV under the action of blood flow shearing force, and is used for promoting vascular endothelial repair and inhibiting proliferation and migration of vascular smooth muscle cells. The problems that a traditional intravascular stent cannot regulate and control the vascular repair process through electrical stimulation, application of existing piezoelectric materials cannot meet the characteristic requirements of the intravascular stent, and then postoperative intravascular restenosis is difficult to prevent and treat can be solved.

The application provides a method for preparing a titanium-niobium oxide low-temperature electrode material. The method is characterized in that the titanium-niobium oxide low-temperature electrode material is prepared by a co-precipitation method, potassium heptafluoroniobate is used as a niobium source, titanyl sulfate is used as a titanium source, and ammonia is used as a co-precipitation agent, and carbon nanotubes are used together. By changing the feeding ratio of the precursor, the calcination temperature and the calcination atmosphere, titanium-niobium oxide low-temperature electrode materials with different properties can be obtained. The preparation method is simple and safe, and the prepared titanium-niobium oxide low-temperature electrode material has high capacity performance as a negative electrode material of a lithium ion battery.

This invention relates to the field of crystal growth technology, specifically to a potassium tantalate niobate crystal, its preparation method, and its applications. Its chemical formula is: K 1+z‑a A a Ta 1‑x‑y Nb x D y O3, where the A-doped ion is co-doped with Na⁺ and Li⁺, and a is the molar equivalent of A element 0≤a≤0.1; the D-site doped ion is Sn. 4+ Fe 3+ Co-doping is performed, where y is the molar amount of element D, with y ≤ y ≤ 0.2; X is the molar equivalent of element Nb, with 0.3 ≤ x ≤ 0.45; and element K is added in excess, with Z being the excess molar equivalent of element K, with 0.1 ≤ Z ≤ 0.3. Combined with a gradient cooling process for excess K, phase transformation stress is released, crystal cracking is avoided, and large-size, high-quality KTN single crystals are obtained.

There is provided a piezoelectric film, being a polycrystalline film comprised of potassium sodium niobate; containing at least one metal element selected from a group consisting of Cu and Mn; and having 1.0 or less ratio of a concentration B of the metal element at grain boundaries of crystals, with respect to a concentration A of the metal element in a matrix phase of the crystals.

The present application relates to a kind of barium nickel niobate-potassium niobate ferroelectric film material and its preparation method and application, the barium nickel niobate-potassium niobate ferroelectric film material includes substrate, bottom electrode layer, film layer and transparent top electrode layer from bottom to top sequentially arranged;The substrate is inorganic mica substrate;The film layer is barium nickel niobate-potassium niobate, and the chemical composition is [KNbO3] 0.9 [BaNi 1 / 2 Nb 1 / 2 O3] 0.1 , preparation method is sol-gel method.Compared with prior art, the preparation method of the present application is economical and environmental protection, preparation process is simple, and the barium nickel niobate-potassium niobate ferroelectric film material prepared is brand-new flexible all-inorganic film, can realize stable light response output, and is expected to realize application in photovoltaic device field.