Synthesis of Co-Doped Tialite Ceramic Pigments and Coloring in Glazes
Synthesis of gray ceramic pigment was carried out by doping cobalt on Tialite crystal structure. Tialite was synthesized by using Al2O3 and TiO2, and was doped with Co3O4 as a chromophore material. To prevent the thermal decomposition during cooling procedure Fe2O3 was added by 0.05mole as a stabilizer. Samples were fired at 1400~1500°C for 2hours and cooled naturally. Crystal structure, solubility limit and color of synthesized pigment were analyzed by XRD, Raman spectroscopy, UV and UV-vis. Yield percentage of Tialite was 96.15% with using Fe2O3 as a stabilizer. It was found that solubility limit of Co2+ in Tialite crystal was 0.03 mole% through analysis of XRD and Raman. By adding pigment with 0.03 mole% of Co2+ to lime-barium glaze, stabilized Dark Gray color glaze having 46.12, -1.26, 0.53 as CIE-L*a*b* was synthesized.
Hyungsun Kim, Jian Feng Yang, Chuleol Hee Han, Somchai Thongtem and Soo Wohn Lee
Y. J. Kim et al., "Synthesis of Co-Doped Tialite Ceramic Pigments and Coloring in Glazes", Materials Science Forum, Vol. 695, pp. 299-302, 2011