Color and structural analysis of CoxZn7−xSb2O12 pigments

Autor:	I. M. G. Santos, A. G. Souza, Elson Longo, D. S. Gouveia, Carlos A. Paskocimas, Luiz E. B. Soledade
Rok vydání:	2006
Předmět:	Ligand field theory Materials science Absorption spectroscopy Band gap Mechanical Engineering Spinel Analytical chemistry Infrared spectroscopy Chromophore engineering.material Condensed Matter Physics Absorbance Mechanics of Materials X-ray crystallography engineering General Materials Science
Zdroj:	Materials Research Bulletin. 41:2049-2056
ISSN:	0025-5408
DOI:	10.1016/j.materresbull.2006.04.012
Popis:	The polymeric precursor method was successfully used to synthesize CoxZn7−xSb2O12 (x = 0–7) powders. Pigments were evaluated using colorimetry, X-ray diffraction, UV–vis and infrared spectroscopy. The optical band gap values vary with the Co2+ substitution. These results suggest that the concomitant presence of Co and Zn in the spinel lattice leads to the rupture of the Vegard law, as well as other properties of the studied system, such as unit cell volume. The Co-richer samples display a higher absorbance than the Co-lean samples. The high absorption of the Co7Sb2O12 sample at most of the visible region makes this compound a candidate for a black pigment. It was shown that color depends on the site where the chromophore ion is located, in agreement with the ligand field theory.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a4030b17043c3bbe0c69061bbe5825e5 https://doi.org/10.1016/j.materresbull.2006.04.012 Zobrazit plný text záznamu Full Text from ScienceDirect