Novel inorganic orange pigments based on BiFeWO<sub>6</sub>

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  • OKA Ryohei
    Field of Advanced Ceramics, Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology
  • TAKEMURA Akari
    Department of Engineering, Graduate School of Sustainability Science, Tottori University
  • SHOBU Yusuke
    Department of Engineering, Graduate School of Sustainability Science, Tottori University
  • MINAGAWA Kohei
    Department of Engineering, Graduate School of Sustainability Science, Tottori University
  • MASUI Toshiyuki
    Department of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University

Abstract

<p>Bi1−xLaxFeWO6 (0 ≤ x ≤ 0.30) samples were synthesized by a co-precipitation method. Their crystal structure, optical properties, and color of the pigments were characterized as novel inorganic orange pigments. In the case of the La3+-doped samples, the target phase was obtained almost in a single-phase form. Strong optical absorption was observed below 550 nm in all samples. As a result, the Bi1−xLaxFeWO6 (0 ≤ x ≤ 0.30) samples exhibited orange colors, and the most vibrant orange hue was obtained at Bi0.90La0.10FeWO6. Although the yellowness value of the Bi0.90La0.10FeWO6 (b* = +37.7) pigment was a little smaller than those of the commercially available orange pigments, the redness value of this pigment (a* = +28.5) was larger. Therefore, this pigment exhibited a reddish orange color as compared with the conventional orange ones. In addition, this pigment was chemically stable. Since the Bi0.90La0.10FeWO6 pigment is composed of non-toxic elements, it could be a new environmentally friendly inorganic orange pigment.</p>

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