Microstructure and Formation Process of the Characteristic Reddish Color Pattern Hidasuki on Bizen Stoneware: Reactions Involving Rice Straw
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- 作者：Yoshihiro Kusano ; Minoru Fukuhara ; Tatsuo Fujii ; Jun Takada ; Ryu Murakami ; Akira Doi ; Laurence Anthony ; Yasunori Ikeda ; and Mikio Takano
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：September 21, 2004
- 年：2004
- 卷：16
- 期：19
- 页码：3641 - 3646
- 全文大小：344K
- 年卷期：v.16,no.19(September 21, 2004)
- ISSN：1520-5002
文摘
The formation process of Hidasuki, a characteristic reddish coloring pattern on traditionalJapanese unglazed stoneware called Bizen, was studied through model experiments. Pelletsof the same type of clay used to form Bizen stoneware were heated to 1250 
C with andwithout contact with rice straw and then were cooled at different rates. A reddish colorappeared for relatively slowly cooled samples when rice straw was present. Owing to thepresence of potassium in the rice straw, the mullite (3(Al,Fe)2O3·2SiO2), the major phaseformed in the absence of rice straw, was replaced by corundum (
-Al2O3), hematite (-Fe2O3),and others in the surface region of about 50 
m in depth. The corundum precipitated ashexagonal platelike crystals, and on the edges of these crystals the hematite grew epitaxially.The growth continued so that the primary corundum crystals were wholly covered byhematite to form a specific single crystalline -Fe2O3/-Al2O3/-Fe2O3 structure. Thecontribution of this unique microstructure to coloring is discussed. On the basis of theseanalytical results, the Hidasuki pattern was reproduced artificially in the form of writtencharacters.
C with andwithout contact with rice straw and then were cooled at different rates. A reddish colorappeared for relatively slowly cooled samples when rice straw was present. Owing to thepresence of potassium in the rice straw, the mullite (3(Al,Fe)2O3·2SiO2), the major phaseformed in the absence of rice straw, was replaced by corundum (-Al2O3), hematite (-Fe2O3),and others in the surface region of about 50 m in depth. The corundum precipitated ashexagonal platelike crystals, and on the edges of these crystals the hematite grew epitaxially.The growth continued so that the primary corundum crystals were wholly covered byhematite to form a specific single crystalline -Fe2O3/-Al2O3/-Fe2O3 structure. Thecontribution of this unique microstructure to coloring is discussed. On the basis of theseanalytical results, the Hidasuki pattern was reproduced artificially in the form of writtencharacters.