3results about How to "High polarization" patented technology

The invention discloses a heat treatment method of high-polarization-intensity bismuth ferrite-lead titanate-barium zirconate titanate based ferroelectric ceramic, which comprises the following steps: arranging an electrode on the surface of a bismuth ferrite-lead titanate-barium zirconate titanate based ferroelectric ceramic sintered body, and then putting the sintered body into a rapid annealing furnace; the preparation method comprises the following steps: heating to 550-650 DEG C from room temperature at a heating rate of 5-80 DEG C / s, carrying out heat preservation for 45-75 seconds, carrying out first rapid annealing, and cooling to room temperature at a cooling rate of 250-350 DEG C / s, thereby obtaining the bismuth ferrite-lead titanate-barium zirconate titanate based ferroelectric ceramic. The heat treatment method provided by the invention can rearrange defects in the ceramic, increase domain conversion switches, improve the performance of the ceramic, and improve the performance of the ceramic. Furthermore, the ferroelectric piezoelectric property of the polarized BF-PT-BZT ceramic is greatly improved, and meanwhile, the polarized BF-PT-BZT ceramic has high Curie temperature.

The invention provides a lead-based antiferroelectric / relaxor ferroelectric composite ceramic material and a preparation method and application thereof.The lead-based antiferroelectric / relaxor ferroelectric composite ceramic material comprises an antiferroelectric phase material and a relaxor ferroelectric phase material, the antiferroelectric phase material is Pb < 0.94 > La < 0.04 > (Zr < 0.84 > Sn < 0.15 > Ti < 0.01 >) O3, and the relaxor ferroelectric phase material is 0.8 Ba (Zr < 0.1 > Ti < 0.9 >) O < 3 >-0.2 Bi (Zn < 2 / 3 > Ta1 / 3) O3; the nominal chemical formula of the lead-based antiferroelectric / relaxor ferroelectric composite ceramic material is Pb < 0.94 > La < 0.04 > (Zr < 0.84 > Sn < 0.15 > Ti < 0.01 >) O < 3 > / 0.8 Ba (Zr < 0.1 > Ti < 0.9 >) O < 3 >-0.2 Bi (Zn < 2 > / 3 > Ta1 / 3) O < 3 >; the mass percent of the relaxor ferroelectric phase material relative to the antiferroelectric phase material is x, and x is more than 0 and less than or equal to 4wt%.

A calcium titanate-based dielectric material with high energy storage performance was designed. The chemical formula of this material is Ca. 1‑x Dy x (Ti 1‑y Hf y ) 1‑x / 4 O3-z mol%M, where x=0.005~0.05, y=0.1~0.2, z=0~2, and M is MnO2 or BaCu(B2O5). It is prepared using solid-state reaction and tape casting methods. This invention, based on calcium titanate-based ceramics with high breakdown field strength, employs a series of strategies to improve energy storage performance, including element substitution, doping with sintering aids, and process improvement: partial substitution of Hf elements at the B site increases the band gap; doping with sintering aids improves grain density, both of which enhance the breakdown field strength; the addition of rare earth element Dy enhances the polarization response by introducing defect dipoles; the non-stoichiometric design reduces oxygen vacancy compensation, thereby increasing resistivity; and the tape casting method improves ceramic density and grain uniformity. The final prepared calcium titanate-based energy storage medium ceramic material exhibits good energy storage performance, with Ca... 0.995 Dy 0.005 (Ti 0.9 Hf 0.1 ) 0.99875 The best energy storage performance was achieved in O3-0.5 mol% BaCu(B2O5) ceramics, with a breakdown field strength of 101.90 kV / mm and an effective energy storage density of 10.22 J / cm³. 3 .