Artículos de revistas
Thermogravimetric and UV-vis spectroscopic studies of chromium redox reactions in rutile pigments
Fecha
2009-07-01Registro en:
Journal of Thermal Analysis and Calorimetry. Dordrecht: Springer, v. 97, n. 1, p. 99-103, 2009.
1388-6150
10.1007/s10973-009-0074-8
WOS:000270840800017
Autor
Universidade Federal da Paraíba (UFPB)
Universidade Estadual Paulista (Unesp)
Universidade Federal do Rio Grande do Norte (UFRN)
Institución
Resumen
In this study undoped and Cr, Sb or Mo doped TiO(2) were synthesized by polymeric precursor method and characterized by X-ray diffraction, UV-VIS spectroscopy, infrared spectroscopy and thermogravimetry (TG). The TG curves showed a continuous mass loss assigned to the hydroxyl elimination and Cr(6+) reduction. Doped TiO(2) samples showed a higher mass loss assigned to water and gas elimination at lower temperatures. In these doped materials a decrease in the anatase-rutile phase transition temperature was observed. After calcination at 1,000 A degrees C, rutile was obtained as a single phase material without the presence of Cr(6+).