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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/75374
Title: 
Lanthanum cobaltite black pigments with perovskite structure
Author(s): 
Institution: 
  • Universidade Federal da Paraíba (UFPB)
  • Universidade Federal do Rio Grande do Norte (UFRN)
  • Universidade Estadual Paulista (UNESP)
  • Centro Acadêmico Do Agreste
ISSN: 
0143-7208
Abstract: 
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.
Issue Date: 
9-May-2013
Citation: 
Dyes and Pigments, v. 98, n. 3, p. 459-463, 2013.
Time Duration: 
459-463
Keywords: 
  • 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
Source: 
http://dx.doi.org/10.1016/j.dyepig.2013.03.012
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/75374
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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