 Titanium monoxide

Titanium monoxide is conventionally written $\mathrm{TiO}$, corresponding formally to titanium(II) oxide. Its crystal chemistry includes substantial vacancies on the metal and oxygen sublattices.

Vacancy ordering can produce a lower-symmetry structure even at an overall one-to-one titanium-to-oxygen ratio. This illustrates why stoichiometry alone does not specify a solid's atomic arrangement.^[ref]