Abstract The Raman and i.r. absorption spectra of polycrystalline TiTa 2O 7 were recorded at room temperature. No systematic coincidences in frequency were observed in the two vibrational spectra and this may be considered as indicating that TiTa 2O 7 crystallizes with an inversion symmetry. The observed Raman bands in the high frequency region are interpreted as due to corner and edge-shared octahedra. The existence of a Raman band at 1020 cm −1 indicates the presence of a short cation—oxygen distance and this is in agreement with the structural analog TiNb 2O 7.