Ceramic pigment obtained by polymeric precursors
| Autor: | S.D. Cunha, A. E. Martinelli, I. Maia, J.D. Cunha, M.A.F. Melo, Dulce Maria de Araújo Melo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Materials science
Polymeric precursors Process Chemistry and Technology General Chemical Engineering Color centers and oxide chemistry.chemical_element Mineralogy law.invention chemistry.chemical_compound Pigment chemistry law Ternary compound Lanthanum visual_art X-ray crystallography visual_art.visual_art_medium Calcination Thermal stability Ceramic Thermal analysis Ceramic pigments LaFeO3 Nuclear chemistry |
| Zdroj: | Repositório Institucional da UFRN Universidade Federal do Rio Grande do Norte (UFRN) instacron:UFRN |
| Popis: | Fe 2 O 3 has been used as ceramic pigment due to excellent colorimetric characteristics combined with thermal stability. The introduction of La +3 to Fe 2 O 3 yields the precipitation of the perovskyte structure (LaFeO 3 ) with corresponding differences in the color of the resulting pigment. The compound was synthesized from polymeric precursors and characterized by thermal and colorimetric analyses, infrared and UV–visible spectroscopy, and X ray diffraction. The characteristic light brown color of Fe 2 O 3 changed to orange with the addition of La +3 . As the calcination temperature increased from 900 °C to 1100 °C the pigment darkened as a result of the reduction of Fe +3 → Fe +2 with corresponding change of the colorimetric coordinates from L * a * b * = 49.003, 10.541, 12.609 to L * a * b * = 31.279, 6.096, 6.877. |
| Databáze: | OpenAIRE |
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