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http://acervodigital.unesp.br/handle/11449/75374
- Title:
- Lanthanum cobaltite black pigments with perovskite structure
- Universidade Federal da Paraíba (UFPB)
- Universidade Federal do Rio Grande do Norte (UFRN)
- Universidade Estadual Paulista (UNESP)
- Centro Acadêmico Do Agreste
- 0143-7208
- In this work La1-xCaxCoO3 (x = 0-0.4) pigments were synthesized by the polymeric precursor method with heat treatments at 700, 800 and 900 C for 4 h. The powders were characterized by colorimetry, UV-vis spectroscopy and powder X-ray diffraction (XRD). The X-ray diffraction patterns showed the presence of a single phase perovskite, changing its structure from rhombohedral to cubic, when calcium was added to the lattice. All of the pigments had a black colour with a strong absorption over the whole of the visible spectrum as a consequence of the different oxidation states of cobalt and the high short-range disorder. The substitution of Ca2+ for La3+ did not influence the pigment colour but decreased its final cost. © 2013 Elsevier Ltd. All rights reserved.
- 9-May-2013
- Dyes and Pigments, v. 98, n. 3, p. 459-463, 2013.
- 459-463
- Black pigment
- Cobaltite
- Lanthanum
- Perovskite
- Polymeric precursor method
- Solid solution
- Lanthanum cobaltite
- Perovskite structures
- Polymeric precursor methods
- Powder X ray diffraction
- Strong absorptions
- UV-vis spectroscopy
- Absorption spectroscopy
- Calcium
- Cobalt compounds
- Color
- Lanthanum alloys
- Polymers
- Solid solutions
- Ultraviolet visible spectroscopy
- X ray diffraction
- X ray powder diffraction
- http://dx.doi.org/10.1016/j.dyepig.2013.03.012
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/75374
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