Synthesis and characterization of the Bi-for-Ca substituted copper-based apatite pigments

M. A. Pogosova, D. I. Provotorov, A. A. Eliseev, M. Jansen, P. E. Kazin

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22 Citations (Scopus)

Abstract

Substitution of Bi for Ca in the red-violet pigment Ca10(PO 4)6CuyO2H2-y-δ has been studied in order to access possibilities to vary the color of the pigment. Synthesized compounds have been investigated by powder X-ray diffraction, diffuse reflectance (ultraviolet-visible-near infrared range) and Raman spectroscopy. Initial Bi-free samples contain Cu in the hexagonal channels, and a fraction of the Cu atoms constitutes recently discovered chromophore [O-CuIII-O]--units. Bi3+ occupies Ca 2+ position in the hexagonal channel walls and causes the reduction of the chromophore concentration. A small fraction of Cu2+ substitutes Ca2+ and forms a new chromophore characterized by the main absorption band at 400 nm and the resonant Raman band at 593 cm -1. Consequently, Bi-doping suppresses the initial red-violet color of the pigment while a yellow tint emerges. This may open an opportunity to develop new less-toxic yellow pigments.

Original languageEnglish
Pages (from-to)96-101
Number of pages6
JournalDyes and Pigments
Volume113
DOIs
Publication statusPublished - Feb 2015
Externally publishedYes

Keywords

  • Apatite
  • Chromophore
  • Copper-doping
  • Crystal structure
  • Pigment
  • Raman spectroscopy

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