This article is cited in 1 paper

XXI All-Russian School-Seminar on Condensed Matter Physics (SPFKS-21), Yekaterinburg, March 18-25, 2021
Phase transitions

First-order phase transition in nanotubular titanium dioxide

A. A. Sushnikova^ab, A. A. Valeeva^bc, I. B. Dorosheva^ab, A. A. Rempel<sup>ab

a</sup> Institute of Metallurgy, Ural Division of the Russian Academy of Sciences, Yekaterinburg
^b Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
^c Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Ekaterinburg

Abstract: Titanium dioxide (TiO$_2$) nanotubes array with the length of 16 $\mu$m 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. $I$4/amd). Observed phase transition of first order takes place at temperature about 350$^\circ$С.

Keywords: nanotubular titanium dioxide films, anodic oxidation, phase transition, anatase, TG, DSC.

Received: 08.07.2021
Revised: 13.07.2021
Accepted: 16.07.2021

DOI: 10.21883/FTT.2021.12.51659.17s

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