"Novel environmentally friendly inorganic red pigments based on calcium" by WENDUSU, Tetsuro YOSHIDA et al.

Article Title

Novel environmentally friendly inorganic red pigments based on calcium bismuth oxides

Authors

WENDUSU, Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
Tetsuro YOSHIDA, Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
Toshiyuki MASUI, Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
Nobuhito IMANAKA, Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

Keywords

calcium bismuth oxide, environmentally friendly, red pigment, solid solution, cation complexation method

Abstract

Novel environmentally friendly inorganic red pigments based on calcium bismuth oxide, Ca₃(Bi_1−xRE_x)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(Bi_0.93Y_0.07)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.

DOI

https://doi.org/10.1007/s40145-015-0129-1

Publisher

Tsinghua University Press

Recommended Citation

WENDUSU, Tetsuro YOSHIDA, Toshiyuki MASUI et al. Novel environmentally friendly inorganic red pigments based on calcium bismuth oxides. Journal of Advanced Ceramics 2015, 4(1): 39-45.

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