Microstructure and coloring mechanism of iron spots on bluish white porcelain from Jingdezhen of the Song Dynasty |
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Authors: | Qianying Hoo Xiaohu Wang Feng Yuan Xuewei Cao Tiewa Cao Maolin Zhang |
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Affiliation: | 1. Research Institute of Meticulous Style Painting in Heavy Colors, Tianjin University, Tianjin, 300072, PR China;2. School of Physics, Nankai University, Tianjin, 300071, PR China;3. School of Mechanical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, PR China;4. Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi, 333001, PR China |
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Abstract: | Jingdezhen is famous for its bluish white (Qingbai) porcelains of the Song Dynasty, and those decorated with iron spots are distinctive among them. Herein, iron spots on a bluish white porcelain were investigated using a series of microscopic and spectroscopic characterizations. We found the decreasing iron content from more than 8 wt% to about 2 wt% during the glaze color transition from rusty to brown and finally into green, which built a connection on the coloring mechanism of iron-rich crystallized glaze and celadon glaze. We identified the rare ε-Fe2O3, a promising magnetic material, in both the dark brown crystals and the triangular crystals in the rusty area, which is its first discovery among bluish white porcelains. Based on these findings, we discussed the coloring mechanism of iron-spot decoration along with the physical form of the iron oxide crystals, indicating the partially reducing atmosphere during firing process. |
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Keywords: | Bluish white porcelain Jingdezhen Iron spot |
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