X-ray diffraction study of thermal properties of titanium dioxide

Popović, Stanko and Skoko, Željko and Gajović, Andreja and Furić, Krešimir and Musić, Svetozar (2005) X-ray diffraction study of thermal properties of titanium dioxide. Fizika A, 14 (1). pp. 19-28. ISSN 1330-0008

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Temperature dependence of microstructure of titanium dioxide, TiO_2, and the phase transition of anatase (A) to rutile (R) were studied by in situ X-ray powder diffraction. The as-synthesized TiO_2 p.a. showed a gradual transition A→R during the temperature increase from ≈ 1200 K to ≈ 1570 K and during the temperature decrease to ≈ 600 K. High-energy ball –milling at room temperature induced a partial transition A→R. The transition continued during the temperature increase to » 1370 K and during the temperature decrease, and is accompanied by sharpening of diffraction lines. Anisotropy of thermal expansion was noticed for both A and R. In the transition A→R, the nuclei of R are formed either throughout the A crystallites (in the case of as-synthesized TiO_2 p.a.) or mainly in the interior of the A crystallites (in the case of the milled TiO_2 p.a.). These nuclei grow in number and size with a prolonged time of thermal agitation.

Item Type: Article
Keywords: titanium dioxide, rutile, anatase, phase transition, thermal expansion, X-ray powder diffraction
Date: 2005
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 15 Apr 2014 17:01
Last Modified: 15 Apr 2014 17:01
URI: http://digre.pmf.unizg.hr/id/eprint/850

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