KHATIM, O., AMAMRA, M., CHHOR, K., BELL, Anthony, NOVIKOV, D., VREL, D. and KANAEV, A. (2013). Amorphous–anatase phase transition in single immobilized TiO2 nanoparticles. Chemical Physics Letters, 558, 53-56. [Article]
Abstract
Kinetics of the amorphous–anatase phase transition in single immobilized 5-nm TiO2 nanoparticles has been studied at temperatures between 400 and 1000 °C at the DORIS-III synchrotron source of Hasylab. The measurements indicate the anatase phase appearance at temperatures above 500 °C. No formation of rutile phase was observed. The transformation kinetics for each fixed temperature is rapid and completes within 5 min. The crystalline mass progressively increases with temperature and the full transformation into anatase polymorph is achieved above 800 °C. The results suggest higher surface energy of the anatase phase compared to amorphous one, which delays the crystallization process.
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