Fig. 4

HRSEM of 2.5 mol% TiO2-doped glass–ceramics at different scales, where (a) 100 and 20 μm, and (b) 10 and 5 μm, respectively.

HRSEM of 2.5 mol% TiO2-doped glass–ceramics at different scales, where (a) 100 and 20 μm, and (b) 10 and 5 μm, respectively.