Phase transition rate of anatase during detonation synthesis of TiO2

TiO₂ powders were synthesized by two types of mixed explosives in a sealed reaction kettle. The phase and morphology of TiO₂ powders were obtained by X-ray diffractometry and transmission electron microscopy. Results indicate that powders obtained from metatitanic acid contained mixed explosive are mixed crystal of anatase and rutile. The phase transition rate of anatase increases from 22.9% to 93.3% with the rise of mass ratio of hexogen, and the grain size also enlarges gradually. The powder obtained from anatase contained mixed explosive is rutile, and the phase transition rate of anatase is 100%. Compared with that before detonation, the grain size of anatase after detonation significantly changes, from nanoscale to micronscale. Based on the calculation of detonation parameters, the phase transition process and grain growth during the synthesis of TiO₂ by means of detonation method are analyzed, and the nucleating collision–growth model is proposed.