13 results about "Potassium niobate" patented technology

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.

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 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.

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.

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.

The application provides a lead-free piezoelectric ceramic material, a preparation method thereof and a piezoelectric device. The lead-free piezoelectric ceramic material is expressed by a chemical general formula as follows: (1-x-y)(K 1‑a Na a )(Nb 1‑b M b )O3-xAWO4-yBMoO4; wherein (K 1‑a Na a )(Nb 1‑b M b )O3 represents a potassium sodium niobate-based ceramic material, 0.4<=a<=0.6, 0<=b<=0.1, M is a doped metal element; x and y are molar fractions, and satisfy: 0

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.

This piezoelectric element comprises a columnar laminate and two conductor layers. In the columnar laminate, alternately laminated are: piezoelectric bodies having potassium sodium niobate as a main component; and internal electrodes. The two conductor layers are respectively located on the side surfaces of the laminate and are respectively connected to the corresponding internal electrodes. Each piezoelectric body has a first portion and a second portion. Each first portion overlaps the internal electrodes in a plan view in the lamination direction. Each second portion is located to the outside of the first portion, and does not overlap the internal electrodes in the plan view. The concentration of potassium and / or sodium contained in each piezoelectric body is constant at the first portion, increases stepwise at the interface between the second portion and the first portion, and, in the second portion, gradually decreases from the interface to the surface.

This invention provides a rare-earth-doped potassium sodium niobate transparent ceramic, its preparation method, and its application. Its chemical composition is: (K 0.5 Na 0.5 ) （1‑x‑y） Eu x Y y Nb （1‑z） Ta z O3, where 0 < x < 0.1, 0 < y < 0.01, 0 < z < 0.02. The rare-earth-doped potassium sodium niobate transparent ceramic of the present invention exhibits high light transmittance and light-changing properties; with the introduction of Y and Ta, the crystal structure and microstructure of the material are changed, increasing the vacancy-related defects of the material, while inhibiting the grain growth of the material, thereby simultaneously improving the light transmittance and light-changing rate of the ceramic. Its light transmittance can reach more than 70%, and the light-changing rate can reach up to 37.58%.

This invention relates to the field of piezoelectric materials and discloses a method for preparing a high-fatigue-resistant lead-free piezoelectric thin film. The method uses magnetron sputtering to directly prepare a lead-free piezoelectric thin film with a top electrode. The thin film layer of the lead-free piezoelectric thin film is a pure-phase potassium sodium niobate ceramic. An adhesive layer is disposed between the pure-phase potassium sodium niobate and the top electrode layer. The sputtering target for the adhesive layer is one or more of titanium, zirconium, ruthenium, titanium oxide, ruthenium oxide, and lanthanum nickelate. During the annealing process, the adhesive layer undergoes oxidation to form an oxide layer, which significantly improves the adhesion of the adhesive layer to the top electrode layer. The adhesive layer also significantly inhibits the volatilization of alkali metal elements in the thin film layer and significantly improves the fatigue resistance of the potassium sodium niobate thin film. The lead-free piezoelectric thin film prepared by this method exhibits high fatigue resistance at 10°C. 8 After the second electrical fatigue cycle, the residual polarization showed no significant decay.

A piezoelectric ceramic of the present disclosure contains, in potassium sodium niobate, at least one selected from the group consisting of strontium zirconate, barium zirconate, strontium titanate, and barium titanate. A piezoelectric element of the present disclosure includes a pair of electrodes on one surface of the piezoelectric ceramic and on the other surface located opposite to the one surface.

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%.