Preparation of yellowish-red Al-substituted αFe2O3 powders and their thermostability in color

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

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


(Figure Presented) 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.

Original languageEnglish
Pages (from-to)20282-20289
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number22
Publication statusPublished - Nov 26 2014


  • Aluminum
  • Color
  • Hematite
  • Iron oxides
  • Thermostability

ASJC Scopus subject areas

  • Materials Science(all)


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