Crystal Defects and Cation Redistribution Study on Nanocrystalline Cobalt-Ferri-Chromites by Positron Annihilation Spectroscopy

Figure 10

Schematic representation of the two neighboring octants of a normal spinel structure. The large circles represent oxygen ions. The small solid and open circles represent the cations at the tetrahedral and octahedral sites, respectively, as illustrated in [33].