Synthesis and Properties of Co-Doped Blue Pigments from the System Al₂O₃-SiO₂

Abstract:

The proposed work shows a way to synthesize blue ceramic pigments. All pigments are synthesized by the method of solid-phase synthesis. Both pure and waste materials were used as raw materials. The optimal conditions for synthesis are determined. The mixtures were sintered at temperatures of 1350 ^°С and 1400 ^°С with one hour isothermal hold. The high-temperature solid-phase synthesis was carried out in a Nabertherm furnace. The chromophore used to acquire the blue color of the pigments is Co, introduced into the batches as Co₂O₃. The amount of the chromophore is 5%. Finely dispersed pigments with a blue color were obtained, obtained from pure and waste raw materials. In the first series, pure Al₂O₃ and SiO₂, introduced into the batches as amorphous SiO₂.nH₂O, were used as starting raw materials, since it is significantly more reactive than ordinary crystalline quartz. In the second series, Al₂O₃ and ash from oxidized rice husk were used, which contain 94.47% SiO₂. The color characteristics of the pigments obtained in this way were determined - color, brightness, color hue using the CIELab system, which gives a numerical expression of the visual sensation of color. It was shown that the best color characteristics are those of the pigments synthesized from pure raw materials at 1350 ^ºС, with 1 hour of isothermal holding, respectively (a) = -4.1 and (b) = -39.2. The obtained pigments were studied by several methods - SEM, X-ray diffraction, and HSМ. The SEM performed shows that clusters are formed in the pigments synthesized with RHA.

• Periodical: Solid State Phenomena (Volume 394)
• Pages: 55-60
• DOI: https://doi.org/10.4028/p-Eljy1q
• Online since: June 2026
• Authors: Mariela Ganeva Minova, Irena Georgieva Markovska, Adriana Asenova Georgieva*, Fila Slavova Yovkova
• Keywords: Ceramic Pigments, Co-Chromophore, Rice Husk Ash, X-Ray Analysis

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