Korean Journal of Materials Research, Vol.21, No.8, 450-455, August, 2011
Tialite계 세라믹 안료의 합성 및 유약에서의 발색
Synthesis of Tialite Ceramic Pigments and Coloring in Glazes
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Al2TiO5 has a high refractive index and good solubility of the chromophore in the Al2TiO5 lattice, which allows this structure to be a good candidate for the development of new ceramic pigments. However, pure Al2TiO5 is well known to decompose on firing at 900~1100oC. However, this process can be inhibited by the incorporation of certain metal cations into its crystalline lattice. In this study, the synthesis of gray ceramic pigment was performed by doping cobalt on the Al2TiO5 crystal structure. The Al2TiO5 was synthesized using Al2O3 and TiO2, and doped with Co3O4 as a chromophore material. In order to prevent the thermal decomposition during the cooling procedure, MgO was added to samples by 0.05 mole, 0.1 mole, and 0.15 mole as a stabilizer. The samples were fired at 1500oC for 2 hours and cooled naturally. The crystal structure, solubility limit, and color of the synthesized pigment were analyzed using XRD, Raman spectroscopy, UV, and UV-vis. Al2O3 was available for the formation of CoAl2O4, which should also be considered in order to explain the small amount of this phase detected in the sample with the higher Co2+ content (≥ 0.03 mole). It was found that the solubility limit of Co2+ in the Al2TiO5 crystal was 0.02 mole% through an analysis of Raman spectroscopy. Through the addition of a pigment with 0.02 mole% of Co2+ to lime-barium glaze, stabilized gray color pigments with 66.54, .2.35, and 4.68 as CIE-L *a*b*were synthesized.
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