Abstract
Red coloring of glaze by mixing three kinds of zircon-based pigments was studied. The zircon-based pigments used in the glaze have chemical and thermal stabilities in comparison with other ceramic pigments. Generally, the mixture of two kinds of zircon-based pigments produces an intermediate color. From a spectroscopic point of view, it seems to be able to obtain red color by mixing purple and yellow. Therefore, we attempted to synthesize a new type of Mn-zircon purple pigment using ZrO2, SiO2 and MnCO3. The influence of ZrO2 to SiO2 ratio and the type of glaze on the color was analyzed spectroscopically. The color of the pigment (ZSM-50) prepared at the ratio of ZrO2:SiO2=1:1 was fairly purple. It was verified by X-ray diffraction (XRD) that the main phase of the ZSM-50 was zircon. However, the mixture of the ZSM-50 and the yellow Pr-zircon did not yield a fine red color. Hence, salmon pink Fe-zircon pigment was added as third pigment and the ratio of the three kinds of pigments on the color was examined. The reddish brown glaze, which was the most reddish color at present, could be obtained at the ratio of Mn-zircon:Pr-zircon:Fe-zircon=8:1:1.
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