Nonstoichiometry in TiO_2−𝑦 Studied by Ion Beam Methods and Photoelectron Spectroscopy

Table 1

Theoretical analysis of point defects formation in TiO_2−𝑦.

Majority defect	Reaction of formation	Theoretical value of 𝑚𝑦
Doubly ionized oxygen vacancy V^••O	O^𝑥O⟷12O2(g)+V^••O+2e^′	6
Singly ionized oxygen vacancy V^•O	O^𝑥O⟷12O2(g)+V^•O+e^′	4
Titanium interstitial Ti^4+i	Ti^𝑥Ti+2O^𝑥O⟷Ti𝑖^4++4e^′+O2(g)	5
Titanium interstitial Ti^3+i	Ti^𝑥Ti+2O^𝑥O⟷Ti𝑖^3++3e^′+O2(g)	4