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The structural environment of silicon dissolved in rutile and α-PbO 2 -structured TiO 2 (TiO 2 -II) was probed using  29 Si MAS NMR on  29 Si-enriched samples. At 1 atm, about 0.01 wt% SiO 2  is incorporated into TiO 2  as  IV Si, presumably in interstitial sites. Rutile recovered from 6 GPa, 1600 °C contains about 0.6 wt% SiO 2 , incorporated both as  VI Si (~90%) and  IV Si (~10%). TiO 2 -II, synthesized at 12 GPa, 1200°C, contains only  VI Si. The chemical shift for VISi in TiO 2 -II is slightly less negative than that for rutile, and the peak is split, suggesting either a more complex mechanism of substitution or a different response to quenching or decompression in the lower-symmetry structure. Future thermodynamic studies of the TiO 2 -SiO 2  solid solution will have to take into account the mixed coordination environment of the Si in TiO 2 , at low pressures

Silicon coordination in rutile and TiO 2 -II at ambient and high pressures: Si-29 NMR