Fig. 3
From: Predicting the structure and stability of titanium oxide electrides
a Formation enthalpies (ΔH) of various Ti-rich Ti-oxides with respect to decomposition into constituent elemental solids at 0–100 GPa. Data points located on the convex hull (solid lines) represent stable species against any type of decomposition. We also added the experimental P-31c structure into the convex hull (the red circle). b Pressure ranges in which the corresponding structures of different stoichiometries are stabilized. The α-phase (P63/mmc) and ω-phase (P6/mmm) of Ti, and the ζ-phase (C2/m) of O2 are used for calculating ΔH
