Physics of the Solid State
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First-order phase transition in nanotubular titanium dioxide
Sushnikova A.A.1,2, Valeeva A. A. 2,3, Dorosheva I.B.1,2, Rempel A.A. 1,2
1Institute of Metallurgy of Ural Branch of the Russian Academy of Science, Ekaterinburg, Russia
2Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
3Institute of Solid State Chemistry, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia
Email: sushnikova.ann@gmail.com, anibla_v@mail.ru, i.b.dorosheva@urfu.ru, rempel.imet@mail.ru

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Titanium dioxide (TiO2) nanotubes array with the length of 16 μm and the outer diameter of 100 nm were synthesized by anodic oxidation of titanium foil in an electrolyte solution containing a fluorine-containing solution of ethylene glycol. The selected synthesis conditions make it possible to separate the nanotubular array from the titanium foil and study it as a homogeneous functional material. The performed scanning electron microscopy study and Brunauer-Emmett-Teller analysis allowed to get data on the morphology of the samples. X-ray diffraction, thermogravimetric, and differential scanning calorimetry analysis made it possible to determine the temperature of the phase transition of the amorphous state into crystalline anatase (sp.gr. I4/amd). Observed phase transition of first order takes place at temperature about 350oC. Keywords: nanotubular titanium dioxide films, anodic oxidation, phase transition, anatase, TG, DSC.
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