“…9 Below the transition temperature, ordering of Ti and O vacancies leads to the slight distortion of the disordered rock-salt structure, resulting in the phase transformation to an ordered monoclinic structure. 9,12 Therefore, rapid quenching from high temperature has been conventionally required to preserve the rock-salt TiO at room temperature. 9,13 Although rock-salt TiO has been successfully prepared by using non-conventional methods such as laser ablation of metal titanium targets in deionized water, mechanochemical synthesis by using titanium and TiO 2 powders, and laser pyrolysis of titanium isopropoxide aerosol, the preparation by the thermal process, i.e., the equilibrium process, below the transition temperature of 1250 C has not been reported yet.…”