Figure 5

Normalised Raman spectra of ThTi₂O₆ compositions, adopting the brannerite structure, targeting U⁵⁺ and U⁶⁺ incorporation with appropriate charge compensation (see Table 1). The panel shows of the region from 680 to 860 cm⁻¹, showing a weak and broad band centred at 780 cm⁻¹ as an apparent as a shoulder on the comparatively intense and sharp band centred at 765 cm⁻¹; the latter can confidently be assigned as the A_g symmetric stretch of TiO₆ octahedra (spectra are normalized normalised with respect to the intensity of the A_g mode for comparison).