Preparation of Yellowish-Red Al-Substituted α-Fe<sub>2</sub>O<sub>3</sub>Powders and Their Thermostability in Color
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- Hideki Hashimoto
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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- Makoto Nakanishi
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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- Hiroshi Asaoka
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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- Tomoaki Maeda
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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- Yoshihiro Kusano
- Department of Fine and Applied Arts, Kurashiki University of Science and the Arts, Kurashiki, Okayama 712-8508, Japan
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- Tatsuo Fujii
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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- Jun Takada
- Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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説明
Inspired by the traditional Japanese pigment Fukiya bengala, nanocomposite materials were synthesized using a polymer complex method, comprising Al-substituted α-Fe2O3 (hematite) particles with diameters ranging from 40 to 100 nm and ultrafine Fe-substituted α-Al2O3 (corundum) particles smaller than 10 nm in diameter. The obtained powders exhibited a vivid yellowish-red color and high thermostability, making them attractive as potential overglaze enamels on porcelain. Quantitative color measurements revealed that, when heated to 700, 800, and 900 °C, samples displayed high lightness (L*) and color-opponent dimensions (a* and b*) at 10 mol % Al. For the same particle size samples, L*, a*, and b* values increased with the Al molar ratio, revealing that Al substitution in the hematite structure intrinsically enhances lightness and chroma in hematite color. These samples mostly retained their color upon reheating at 900 °C, indicating their high thermostability. This thermostability should originate from the Al substitution-induced enhancement in lightness and chroma in hematite color, which should counter color fading caused by particle growth. These composite materials are expected to find application in the porcelain industry, cosmetics, and nanotechnology.
収録刊行物
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- ACS Applied Materials & Interfaces
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ACS Applied Materials & Interfaces 6 (22), 20282-20289, 2014-10-27
American Chemical Society (ACS)
