Naslov
X-Ray diffraction study of thermal properties of titanium dioxide

Autori
Popović, Stanko ; Skoko, Željko ; Gajović, Andreja ; Furić, Krešimir ; Musić, Svetozar

Izvornik
Fizika A : a journal of experimental and theoretical physics (1330-0008) 14 (2005), 1; 19-28

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
titanium dioxide ; rutile ; anatase ; phase transition ; thermal expansion ; X-ray

Sažetak
Temperature dependence of microstructure of titanium dioxide, TiO2, and the phase transition of anatase (A) to rutile (R) were studied by in situ X-ray powder diffraction. The as-synthesized TiO2 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 par- tial 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 TiO2 p.a.) or mainly in the interior of the A crystallites (in the case of the milled TiO2 p.a.). These nuclei grow in number and size with a prolonged time of thermal agitation.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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