(001)pc-oriented (Na0.5Bi0.5)0.94Ba 0.06TiO3 (NBBT) lead-free piezoelectric ceramics were fabricated by the screen printing technique using Na0.5Bi 0.5TiO3 (NBT) templates. The plate-like NBT template particles were synthesized from bismuth layer-structured ferroelectric Bi 4Ti3O12 (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 εT33/ε0 of 910, a remnant polarization Pr of 29.2 μC/cm2, a coercive field E c of 23.5 kV/cm, a piezoelectric coefficient d33 of 180 pC/N, and a thickness-mode electromechanical coupling coefficient kt of 0.485. © 2011 IEEE.
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Enhanced electrical properties of textured NBBT ceramics derived from the screen printing technique
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