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Hashimoto H, Nakanishi M, Asaoka H, et al. Preparation of yellowish-red Al-substituted α-Fe2O3 powders and their thermostability in color. ACS Appl Mater Interfaces. 2014;6(22):20282-9doi: 10.1021/am505820b.
Hashimoto, H., Nakanishi, M., Asaoka, H., Maeda, T., Kusano, Y., Fujii, T., & Takada, J. (2014). Preparation of yellowish-red Al-substituted α-Fe2O3 powders and their thermostability in color. ACS applied materials & interfaces, 6(22), 20282-9. https://doi.org/10.1021/am505820b
Hashimoto, Hideki, et al. "Preparation of yellowish-red Al-substituted α-Fe2O3 powders and their thermostability in color." ACS applied materials & interfaces vol. 6,22 (2014): 20282-9. doi: https://doi.org/10.1021/am505820b
Hashimoto H, Nakanishi M, Asaoka H, Maeda T, Kusano Y, Fujii T, Takada J. Preparation of yellowish-red Al-substituted α-Fe2O3 powders and their thermostability in color. ACS Appl Mater Interfaces. 2014 Nov 26;6(22):20282-9. doi: 10.1021/am505820b. Epub 2014 Oct 27. PMID: 25313688.
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ACS Appl Mater Interfaces. 2014 Nov 26;6(22):20282-9. doi: 10.1021/am505820b. Epub 2014 Oct 27.

Preparation of yellowish-red Al-substituted α-Fe2O3 powders and their thermostability in color.

ACS applied materials & interfaces

Hideki Hashimoto, Makoto Nakanishi, Hiroshi Asaoka, Tomoaki Maeda, Yoshihiro Kusano, Tatsuo Fujii, Jun Takada

Affiliations

  1. Graduate School of Natural Science and Technology, Okayama University , Okayama 700-8530, Japan.

PMID: 25313688 DOI: 10.1021/am505820b

Abstract

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.

Keywords: aluminum; color; hematite; iron oxides; thermostability

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