Pechini synthesis and microstructure of nickel-doped copper chromites
| Autor: | Antonio Eduardo Martinelli, Dulce Maria de Araújo Melo, Anne M.G. Pedrosa, Patrícia Mendonça Pimentel, Carlos Neco da Silva Júnior, Jardel Dantas Cunha |
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| Rok vydání: | 2005 |
| Předmět: |
Thermogravimetric analysis
spinel Materials science Scanning electron microscope Infrared spectroscopy engineering.material law.invention law lcsh:TA401-492 ceramic pigments General Materials Science Calcination Fourier transform infrared spectroscopy Mechanical Engineering Spinel Metallurgy Condensed Matter Physics Microstructure Mechanics of Materials engineering lcsh:Materials of engineering and construction. Mechanics of materials chromites Pechini method BET theory Nuclear chemistry |
| Zdroj: | Materials Research, Volume: 8, Issue: 2, Pages: 221-224, Published: JUN 2005 Materials Research v.8 n.2 2005 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL Materials Research, Vol 8, Iss 2, Pp 221-224 (2005) Repositório Institucional da UFRN Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN |
| ISSN: | 1516-1439 |
| DOI: | 10.1590/s1516-14392005000200024 |
| Popis: | Spinel-type solid solutions were synthesized by the Pechini method and calcined between 500 and 900 °C for 4 hours and at 900 °C for 8 hours to produce ceramic pigments. The resulting powders were characterized by thermogravimetric analysis, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), particle size analysis and BET surface area measurements. The formation of spinel took place upon calcination at 700 °C. IR spectroscopy revealed the presence of N1 and N2 bands, typical of spinel structures, broadened by the presence of more than one cationic species in the structure. The specific area of the resulting powder decreased from 24.7 to 1.4 m2 g-1 as the calcination temperature increased from 700 to 900 °C. Microstructural analyses revealed the presence of crystalline spinel as the only phase present in powders calcined at 900 °C. Colorimetric analyses using L*a*b* coordinates and UV-visible spectroscopy revealed that the pigment was predominantly black |
| Databáze: | OpenAIRE |
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