Figure 2.

Structural characterization of LiNbO₃. (a) Rietveld analysis of neutron diffraction patterns of LiNbO₃. The red dots represent the observed intensity. The black lines represent the calculated intensity. The blue line corresponds to the difference between the observed and calculated intensities. The green line shows the Bragg reflection. In the inset of (a), we show the crystal structure of LiNbO₃. (b) Field-emission scanning electron microscopy (FE-SEM) and (c) high-resolution transmission electron microscopy (HR-TEM) images of LiNbO₃. In the inset of (c), we show a medium-resolution TEM image of a LiNbO₃ nanowire.