Abstract
The anisotropy of polarization and strain behavior in textured Bi 0.5 (Na 0.85 K 0.15 ) 0.5 TiO 3 ceramics are investigated for lead-free piezoelectric ceramics actuators. The textured Bi 0.5 (Na 0.85 K 0.15 ) 0.5 TiO 3 ceramics are fabricated by reactive templated grain growth (RTGG) using plate-like Bi 4 Ti 3 O 12 particles. RTGG[//] (sliced parallel to the casting direction) and RTGG[?] (sliced perpendicularly to the casting direction) specimens show preferred orientation to ≪001≫ pc and ≪110≫ pc , respectively. RTGG[//] specimen has relatively high piezoelectric coefficient of (d33) 335 pm/V and electric field induced strain levels of 0.067% at 20 kV/cm. This values were 86% higher than those of RTGG[?] specimen. ≪001≫ pc textured polycrystalline BNKT ceramics, prepared by RTGG, are a strong candidate for lead-free piezoelectric materials of actuators.
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