Enhanced Electrical Properties of Textured NBBT Ceramics Derived From the Screen Printing Technique

摘要

(001)pc-oriented (Na0.5Bi0.5)0.94Ba0.06TiO3 (NBBT) lead-free piezoelectric ceramics were fabricated by the screen printing technique using Na0.5Bi0.5TiO3 (NBT) templates. The plate-like NBT template particles were synthesized from bismuth layer-structured ferroelectric Bi4Ti3O12 (BiT) precursors by the topochemical method. The screen printed NBBT ceramics with 20 wt% NBT templates contained a large fraction of grains aligned with their c-axis normal to the sample surface, giving a Lotgering factor of 0.486. The dielectric and ferroelectric properties of textured NBBT ceramics were anisotropic. Compared with the non-textured NBBT ceramics, the dielectric, ferroelectric, and piezoelectric properties of the textured NBBT ceramics were improved, giving a dielectric constant ?5;T33 ?5;0 T / of 910, a remnant polarization Pr of 29.2 ;C;C/cm2, a coercive field Ec of 23.5 kV/cm, a piezoelectric coefficient d33 of 180 pC/N, and a thickness-mode electromechanical coupling coefficient ktof 0.485.