Figure 2
SEM and TEM images of the products obtained after reaction for (a) 30 min, (b) 50 min, (c) 10 h and (d) 24 h, with the insets showing the corresponding bright field TEM images. (e) Schematic illustration of the morphological evolution process of the urchin-like Ca2Ge7O16 hollow microspheres: (I) self-assembly process, (II) inside-out Ostwald ripening and recrystallization process and (III) thorough dissolution and recrystallization process.
