Intrinsic luminescence centers in γ- and θ-alumina nanoparticles
Amirsalari Abdolvahab1, Shayesteh Saber Farjami1, †, Ghahrizjani Reza Taheri2, ‡
       

(color online) SEM images of alumina nanoparticles calcined at (a) 550 °C, (b) 750 °C, and (c) 950 °C.