Brown ceramic pigments based on chromium(III)-doped titanite obtained by spray pyrolysis
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Other documents of the author: Lyubenova, Teodora; Ocaña Jurado, Manuel; Carda Castelló, Juan Bautista
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comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/8639
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http://dx.doi.org/10.1016/j.dyepig.2008.03.009 |
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Title
Brown ceramic pigments based on chromium(III)-doped titanite obtained by spray pyrolysisDate
2008Publisher
ElsevierISSN
1437208Bibliographic citation
Dyes and Pigments, 79, 3, p. 265-269Type
info:eu-repo/semantics/articleSubject
Abstract
Cr-doped titanite (CaTiSiO5) pigments were synthesized through spray pyrolysis of aerosols generated from aqueous solutions containing colloidal silica, calcium chloride, titanium(IV) oxychloride and chromium(III) ... [+]
Cr-doped titanite (CaTiSiO5) pigments were synthesized through spray pyrolysis of aerosols generated from aqueous solutions containing colloidal silica, calcium chloride, titanium(IV) oxychloride and chromium(III) nitrate. This process yielded amorphous powders with spherical morphology and broad size distribution (<10 μm) after thermal decomposition at 600 °C. The titanite phase was obtained by further calcination at 800 °C without any addition of flux agents. The brown color of the pigments can be attributed mainly to the existence of Cr(IV) ions occupying both, octahedral positions of Ti(IV) and tetrahedral position of Si(IV), together with a small amount of Cr(III) present as Cr<sub>2</sub>O<sub>3</sub>. The optimum pigment obtained by this method corresponded to a Cr/titanite mole ratio of 0.04. © 2008 Elsevier Ltd. All rights reserved. [-]
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