Local structures and electronic band states of α-Fe₂O ₃ polycrystalline particles in the glazes of the HIZEN celadons produced in the Edo period of Japan, by means of X-ray absorption spectra (II)

HIZEN celadon glazes produced in 1630's to 1790's (Edo period, Japan) have been investigated by means of X-ray absorption spectra (XAS) near a Fe-K edge by using synchrotron radiation and a Mössbauer spectrum. The XAS suggest that the local structure around Fe₂O₃ fine powders is slightly different between the Izumiyama ceramics of mainly the Quartz-SiO₂ and Ohkawachi ceramics of mainly the feldspar of (K,Na)Si₃O ₈ (Sanidine), and that the glazes of the HIZEN celadons include the Fe₂O₃ fine powders in the glassy state, though the X-ray diffraction patterns of the glassy celadon glazes do not show any peaks of the Fe₂O₃ structure. The Mössbauer spectrum suggests that the celadon glaze of Seiji (m) includes only Fe³⁺ ions, but not Fe²⁺ ions. This indicates the existence of Fe₂O ₃ in the celadon glaze. It is interpreted that the colored brightness of the HIZEN celadons is induced by the structural properties of the used raw celadon ceramics and the other transition-metal ions of Cr, Cu, Zn in the celadon glazes, but not by the chemical reaction from Fe₂ O ₃ to FeO under the deoxidizing thermal treatment at higher temperature in a kiln.