The influence of temperature on the color of TiO2:Cr pigments

Vieira, Fagner Ticiano Gomes; Melo, Danniely Silva; Lima, Severino Jackson Guedes de; Silva, Elson Longo da; Paskocimas, Carlos Alberto; Silva Júnior, Wilson; Souza, Antonio Gouveia de; Santos, Iêda Maria Garcia dos

The influence of temperature on the color of TiO2:Cr pigments

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dc.contributor.author	Vieira, Fagner Ticiano Gomes
dc.contributor.author	Melo, Danniely Silva
dc.contributor.author	Lima, Severino Jackson Guedes de
dc.contributor.author	Silva, Elson Longo da
dc.contributor.author	Paskocimas, Carlos Alberto
dc.contributor.author	Silva Júnior, Wilson
dc.contributor.author	Souza, Antonio Gouveia de
dc.contributor.author	Santos, Iêda Maria Garcia dos
dc.date.accessioned	2021-04-07T14:33:36Z
dc.date.available	2021-04-07T14:33:36Z
dc.date.issued	2009-05-06
dc.description.resumo	TiO2:Cr brown pigments were prepared via a polymeric precursor derived from the Pechini method. The pigments were analyzed by infrared spectroscopy, X-ray diffraction, ultraviolet–vis spectroscopy, and colorimetry. The increase of the calcination temperature from 700 to 1000 8C led to a decrease in the L* values, corresponding to darkening of the pigments. The pigments obtained in this work are darker than those produced by a solid-state reaction method reported before. The change in the pigment color is due to the anatase–rutile phase transition, which leads to a shift in the charge transfer bond (Ti4+$O2 ) due to a change in the crystal field around the chromophore ions. Moreover, the oxidation state of chromium was observed to change, and this also alters the color of the pigments	pt_BR
dc.identifier.citation	VIEIRA, Fagner Ticiano Gomes; MELO, Danniely Silva; LIMA, Severino Jackson Guedes de; LONGO, Elson; PASKOCIMAS, Carlos Alberto; SILVA JÚNIOR, Wilson; SOUZA, Antonio Gouveia de; SANTOS, Iêda Maria Garcia dos. The influence of temperature on the color of TiO2: cr pigments. Materials Research Bulletin, [S.L.], v. 44, n. 5, p. 1086-1092, maio 2009. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0025540808003504?via%3Dihub . Acesso em: 11 fev. 2021. http://dx.doi.org/10.1016/j.materresbull.2008.10.007.	pt_BR
dc.identifier.doi	10.1016/j.materresbull.2008.10.007.
dc.identifier.issn	0025-5408
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/32075
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Oxides D. Crystal structure D. Defects D. Color centers	pt_BR
dc.subject	Chemical synthesis	pt_BR
dc.subject	Crystal structure	pt_BR
dc.subject	Defects	pt_BR
dc.subject	Color centers	pt_BR
dc.title	The influence of temperature on the color of TiO2:Cr pigments	pt_BR
dc.type	article	pt_BR