The Effect of Cu Doping on the Transformation from Rutile to Anatase and Cu Occupation Tendency in TiO₂ Solid Solution

Figure 4

Infrared spectra of the Cu-doped TiO₂ samples with different doping concentrations at calcination temperature (550°C). (a) Undoped, (b) 3 mol% Cu, and (c) 5 mol% Cu.

(a)

(b)

(c)