Raman spectrum of anatase, TiO2

Raman spectra of anatase have been observed in natural and synthetic crystals. Both crystals show the same spectral features. The Raman band occurring at 516 cm −1 at room temperature is split into two peaks centred at 519 cm −1 and 513 cm −1 at low temperature (73 K). The six Raman active fundamentals predicted by group theory are all observed and assigned. The spectra are analyzed by a simple model considering only short‐range forces and the calculated vibrational frequencies are in good agreement with the observed Raman frequencies.