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http://dx.doi.org/10.4191/kcers.2019.56.4.07

Nitrogen Doping in Polycrystalline Anatase TiO2 Ceramics by Atmosphere Controlled Firing  

Chang, Myung Chul (Department of Materials Science and Engineering, Kunsan National University)
Publication Information
Journal of the Korean Ceramic Society / v.56, no.4, 2019 , pp. 374-386 More about this Journal
Abstract
A process for nitrogen doping of TiO2 ceramics was developed, whereby polycrystalline titania particles were prepared at 450-1000℃ with variation of the firing schedule under N2 atmosphere. The effect of nitrogen doping on the polycrystallites was investigated by X-ray diffraction (XRD) and Raman analysis. The microstructure of the TiO2 ceramics changed with variation of the firing temperature and the firing atmosphere (N2 or O2). The microstructural changes in the nitrogen-doped TiO2 ceramics were closely related to changes in the Raman spectra. Within the evaluated temperature range, the nitrogen-doped titania ceramics comprised anatase and/or rutile phases, similar to those of titania ceramics fired in air. Infiltration of nitrogen gas into the titania ceramics was analyzed by Raman spectroscopy and XRD analysis, showing a considerable change in the profiles of the N2-doped TiO2 ceramics compared with those of the TiO2 ceramics fired under O2 atmosphere. The nitrogen doping in the anatase phase may produce active sites for photocatalysis in the visible and ultraviolet regions.
Keywords
$TiO_2$; Nitrogen doping; Raman; XRD; Microstructure;
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