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Environmentally friendly reddish inorganic pigments were developed using a solid-state reaction. By controlling the crystal field around Ce3+ and its concentration, the color of Ba2RE1-CeTaO6 pigments can be tuned.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Solid-State Chemistry

Background:

  • Development of novel inorganic pigments is crucial for various industries.
  • Double-perovskite structures offer tunable properties for advanced materials.
  • Cerium (Ce3+) doping in hosts can induce desirable optical properties.

Purpose of the Study:

  • To synthesize environmentally friendly reddish inorganic pigments based on the Ba2RE1-CeTaO6 system.
  • To investigate the relationship between the crystal field environment of Ce3+ and the resulting pigment color.
  • To establish a method for tuning pigment color by controlling Ce3+ concentration and crystal field intensity.

Main Methods:

  • Conventional solid-state reaction method for pigment synthesis.
  • Rietveld refinement analysis to determine crystal structure and bond lengths.
  • Spectroscopic analysis to correlate Ce3+ absorption with color properties.

Main Results:

  • Single-phase solid solutions of Ba2RE1-CeTaO6 (RE = La, Gd, Y) were successfully synthesized.
  • A decrease in the average RE-O bond length led to a stronger crystal field around Ce3+, shifting colors from orange to red, pink, and violet.
  • Pigment color, specifically hue angle (h°), showed a roughly linear relationship with the weighted average ionic radius (rRE) at the RE3+ site.
  • Controlled synthesis of Ba2La0.5-YCe0.5TaO6 confirmed the ability to achieve more reddish hues with high color saturation (C value).

Conclusions:

  • The Ba2RE1-CeTaO6 system is a promising host for developing tunable, environmentally friendly inorganic pigments.
  • Controlling the crystal field intensity around Ce3+ and/or its concentration allows for precise adjustment of optical absorption and pigment color.
  • This study provides a pathway for designing novel inorganic pigments with desired reddish shades for various applications.