Figure 5.

a Topography of the bowl-like BaTiO3 nanoparticle. b Local piezoelectric displacement-voltage loops and effective piezoelectric coefficient of the bowl-like particle at edge (Ι) and the center concave (ΙΙ) area

Deng et al. Nanoscale Research Letters 2010 5:1217-1221   doi:10.1007/s11671-010-9629-7