[16P-T22-02] Microstructure and Formation Mechanism of Ocherous Goma on Traditional Japanese Bizen Stoneware
Keywords:Bizen stoneware, microstructure, formation mechanism
Ocher color called goma appears on Bizen stoneware when shaped Bizen clay, which is mined from Bizen area, Okayama prefecture, Japan, is fired in a firewood kiln. This color has been considered to be the result of a reaction between the clay and ash produced by burning firewood. However, the formation mechanism and microstructure of goma have remained unclear. Herein, we identified the phases formed on goma Bizen fragments provided by a master Bizen potter using powder X-ray diffraction and scanning transmission electron microscopy with energy dispersive X-ray spectroscopy. Additionally, we tried to reproduce the goma Bizen by heating a mixture of the Bizen clay and an artificial ash, which was prepared by mixing chemical reagents of metal oxides and carbonates, in an electric furnace instead of a firewood kiln.