Large piezoelectric coefficient and ferroelectric nanodomain switching in Ba(Ti_(0.80)Zr_(0.20))O_3-0.5(Ba_(0.70)Ca_(0.30))TiO_3 nanofibers and thin films

摘要

Currently available low-dimensional piezoelectric materials show a low piezoelectric coefficient d_(33) of merely 100 pm V~(-1) with Pb(Zr, Ti)O_3-based materials at the high end. Here, we report very large piezoelectricity in Ba(Ti_(0.80)Zr_(0.20))O_3-0.5(Ba_(0.70)Ca_(0.30))TiO_3 (BTZ-0.5BCT) lead-free nanostructures sintered as thin films (d_(33)= 140pm V~(-1)) and nanofibers (d_(33) = 180pm V~(-1)). The influences of lateral size, geometry, and the clamping effect on the piezoelectric performance were investigated for both thin films and nanofibers. Combining a high piezoelectric coefficient with environmental benefits, the BTZ-0.5BCT nanostructures provide the superior functions sought for highly efficient piezoelectric devices and electromechanical systems.