Figure 5.

(a) TEM image and (b) particle size distribution for α‐Al₂O₃ nanoparticles obtained by the redox reaction between α‐Fe₂O₃ and Al (Figure 2 c, second reaction. Scale bar, 20 nm; inset: SAED pattern, scale bar, 5 nm⁻¹). Adapted with permission from ref. [62] under CC BY 4.0.