Figure 4.

a, b TEM images of typical bowl-like BaTiO3 nanoparticles with a concave in the center. c HRTEM images of the corresponding portions (a), (b), (c), (d) in (b). d The corresponding fast Fourier transformation (FFT) pattern of portion (a)

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