Stability Domains of TiO2–Ti3O5–Ti2O3–TiC/Ti(CN) Systems During Reduction Process.

The phase domain of Ti3O5–Ti2O3–Ti(CO) at 1580 K was determined from the formation energies of Ti(C xO y), as calculated via the Gibbs–Duhem equation. An extensive Ti(CO) domain is attributed to the high affinity between TiC and TiO. The phase domain of Ti3O5–Ti2O3–Ti(CN) was obtained at 1673 K using the formation energies of Ti(C xN y). This study shows that the stable region for Ti2O3 is significantly small in the Ti3O5–Ti2O3–Ti(CN) phase domain. It demonstrates the absence of TiO and Ti2O3 in the normal syntheses of TiC and Ti(CN) from TiO2, respectively. [ABSTRACT FROM AUTHOR]