A relationship between oxidation state of iron and color of Arita celadon glaze characterized by 57Fe-Mössbauer spectroscopy

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The effect of firing atmosphere on the oxidation states of Fe in Arita celadon glaze and the glaze color was examined by using Mössbauer spectroscopy. The celadon glaze was prepared from feldspar, BaCO3, kaolin, α-quartz, and Fe2O3 powders and fired on the white porcelain biscuit plate at 1300°C for 0.5 h under several reduction atmospheres. The content of Fe2O3 in the glaze was 2 mass %. In oxygen atmosphere, the color of celadon glaze was gray-yellow due to Fe3+. The color of the celadon glaze changed from gray-yellow to blue-green with increase of CO concentration in the atmosphere. With the increase CO concentration, Fe2+ increased and the concentrations of Fe2+ were 85.9% at 0.5%CO and 95.6% at 1%CO, respectively. At 4% CO, iron state was only Fe2+.
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