Fig. 1
From: Doped, conductive SiO2 nanoparticles for large microwave absorption

Physical properties of SiO2 nanoparticles. a XRD pattern, b, c TEM and d HRTEM images of SiO2 nanoparticles. The panel (a) also shows the standard (PDF#00-038-0360). The yellow dashed lines in (d) point out the amorphous phases