4 results about "Sodium niobate" patented technology

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.

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℃.

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 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%.