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Novel environmentally friendly inorganic red pigments based on calcium bismuth oxide, Ca3(Bi1−xREx)8O15 (0 ≤ x ≤ 0.09; RE = Sc3+, Er3+, Y3+, Ho3+ and Dy3+), were successfully synthesized and the color properties were characterized. The color of these pigments depended on the composition and the synthesis condition, and the most vivid red color was obtained for the Ca3(Bi0.93Y0.07)8O15 sample calcined thrice at 800 ℃ for 2 h. The L* and a* values corresponding to brightness and red chromaticity for this pigment were 45.6 and +30.6, respectively, which were greater than those of a commercially available Fe2O3 pigment (L* = 38.4, a* = +29.5). Since the present pigment is composed of nontoxic and safe elements, it should be an attractive alternative to the conventional Fe2O3 pigment.


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Novel environmentally friendly inorganic red pigments based on calcium bismuth oxides

Show Author's information WENDUSUTetsuro YOSHIDAToshiyuki MASUINobuhito IMANAKA( )
Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

Abstract

Novel environmentally friendly inorganic red pigments based on calcium bismuth oxide, Ca3(Bi1−xREx)8O15 (0 ≤ x ≤ 0.09; RE = Sc3+, Er3+, Y3+, Ho3+ and Dy3+), were successfully synthesized and the color properties were characterized. The color of these pigments depended on the composition and the synthesis condition, and the most vivid red color was obtained for the Ca3(Bi0.93Y0.07)8O15 sample calcined thrice at 800 ℃ for 2 h. The L* and a* values corresponding to brightness and red chromaticity for this pigment were 45.6 and +30.6, respectively, which were greater than those of a commercially available Fe2O3 pigment (L* = 38.4, a* = +29.5). Since the present pigment is composed of nontoxic and safe elements, it should be an attractive alternative to the conventional Fe2O3 pigment.

Keywords:

calcium bismuth oxide, environmentally friendly, red pigment, solid solution, cation complexation method
Received: 24 July 2014 Revised: 18 September 2014 Accepted: 22 September 2014 Published: 31 January 2015 Issue date: March 2015
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Publication history

Received: 24 July 2014
Revised: 18 September 2014
Accepted: 22 September 2014
Published: 31 January 2015
Issue date: March 2015

Copyright

© The author(s) 2015

Acknowledgements

This work was supported by the Development of Alternative Technology for Hazardous Chemical Substances and Development of Novel Environment-and Human-friendly Inorganic Pigments for Three Primary Colors (FY2010-2014) programs of the New Energy and Industrial Technology Development Organization (NEDO) and the Ministry of Economy, Trade and Industry, Japan (METI).

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