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Mechanochemical stability of hydrogen titanate nanostructures

Structural stability of nanostructured titanates was investigated for further processing and possible applications. With the aim to investigate their mechanochemical stability we applied high- energy ball milling and studied induced phase transitions. Hydrogen titanates having two different morphologies, microcrystals and nanotubes, were taken into consideration. The sequence of phase transitions was studied by Raman spectroscopy and X-ray powder diffraction, while morphology and crystal structure at nanoscale were analyzed by high resolution transmission electron microscopy. During mechanochemical treatment of both morphologies, we observed the phase transition from hydrogen titanate to TiO2 anatase and then to TiO2 rutile In the case of microcrystals, phase transition from hydrogen titanate to anatase starts after longer milling time than in the case of nanotubes, which is explained by larger particle size of crystalline powder. On the contrary, further phase transition from anatase to rutile occurred faster in crystalline powder than in the case of nanotubes.

titanates ; nanotubes ; ball milling ; structural phase transitions

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