To investigate color properties by inclusion of hematite in the iron zircon pigments, different samples were prepared by the sol-gel method without mineralizer. The starting amount of the ferric salt in the sol-gel reacting mixture was varied in order to obtain Fe2O3/Zr molar ratio in the range of 5-30%. Fe-ZrSiO4 pigments of the sol-gel reaction were calcined the range 600-1300°C. The crystalline phases were determined by using X-ray diffraction(XRD). The process of inclusion of hematite in iron zircon pink color were studied by UV-Vis-NIR spectroscopy and FT-IR spectroscopy. It was found that the coral pink and reddish color in the iron zircon pigments is due to α-Fe2O3 particles incorporated in the zircon matrix.

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The starting materials were mixture of Kaolin, Silica and Oak tree ash and Fe 2 O 3 were used as coloring agent. In this study Talc was employed for controlling of glaze viscosity and crystallization. To investigate the effects of the formation of niddle shaped spots and properties of Nogime (ÑÚ) Temmoku glazes, different samples were prepared by the contents change of Cao, MgO, Fe 2 O 3 and the different firing conditions. Formation mechanism of the niddle shaped brownish yellow spots of nogime tem moku glazes were determined by using XRD and Micro Raman spectroscopy. The viscosity of glaze were obtained by SiGglass 6.0. The Raman analysis showed that there are mixed crystalline phase of diopside and anorthite, indicating that the small amounts of Fe 2 O 3 were doped on both crystals resulting the yellowish brown color. In this study the viscosity is a main factor at formation mechanism of nogime temmoku crystals. The viscosity of the niddle shaped yellow crystals and the glaze are com pared to confirm the formation mechanism of nogime temmoku glazes. Viscosity showed lower value (1.909) at niddle shaped yellow crystals consist of diopside and anorthite than glaze value (3.247). The crystals of nogime temmoku glazes were formed in vertical direction by the difference of fluidity.