Color and structural analysis of Co {sub x}Zn{sub 7-x}Sb{sub 2}O{sub 12} pigments

Journal Article · Thu Nov 09 04:00:00 EST 2006 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.04.012· OSTI ID:20891946

Gouveia, D S ^[1]; Soledade, L E.B. ^[1]; Paskocimas, C A ^[2]; Longo, E ^[3]; Souza, A G ^[1]; Santos, I M.G. . ^[1]

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1. LTM, DQ, UFPB, Campus I, Joao Pessoa, PB (Brazil)
2. DEM, UFRN, Natal, RN (Brazil)
3. CMDMC, Instituto de Quimica, UNESP-Araraquara, SP (Brazil)

The polymeric precursor method was successfully used to synthesize Co {sub x}Zn{sub 7-x}Sb{sub 2}O{sub 12} (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 Co{sup 2+} 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 Co{sub 7}Sb{sub 2}O{sub 12} 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.

• OSTI ID: 20891946
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 11 Vol. 41; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
ABSORPTION SPECTROSCOPY
CERAMICS
CHEMICAL PREPARATION
COBALT IONS
COLOR
COLOR CENTERS
FIELD THEORIES
INFRARED SPECTRA
LEAD
LIGANDS
OPTICAL PROPERTIES
OXIDES
PIGMENTS
PRECURSOR
RUPTURES
SPINELS
VEGARD LAW
X-RAY DIFFRACTION