Аннотация:An array of highly oriented anatase nanoparticles was successfully prepared from NH4TiOF3 with the assistance of polyetheleneglycol-400 at 450 °C. The study showed the stability of obtained layered TiO2-anatase close to 1200 °C. This research confirmed for the first time that the transition of mesocrystalline anatase to the rutile phase occurs between 1000 °C and 1200 °C, which is more than 400 °C higher than the transition of bulk TiO2 due to the used precursor.