Study of sauce glazed wares from Yaozhou kilns (Northern Song Dynasty, 960–1127 CE): Probing the morphology and structure of crystals in the glazes |
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| Affiliation: | 1. School of Antiquities Preservation Science & Technology, School of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, 710021 Xi’an, China;2. CNRS, CEMES, Toulouse University, 31055 Toulouse, France;3. Institute for the Conservation of Cultural Heritage, Shanghai University, 200444 Shanghai, China;1. Beijing University of Technology, Beijing 100124, China;2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA;2. Mechanical Properties and Mechanics Group, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;1. SIMUMECAMAT Research Group. Universidad de Oviedo. Campus Universitario, 33203 Gijón, Spain;2. Instituto de Cerámica y Vidrio, CSIC. Kelsen 5, 28049 Madrid, Spain;1. CEITEC BUT, Brno University of Technology, Purkynova 123, Brno 61200, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, Brno 61669, Czech Republic |
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| Abstract: | Sauce glaze is one of the main varieties of glazes produced in the Yaozhou kilns during the Song Dynasty. It is famous for its reddish-brown color and high gloss. In this work, the elemental composition, morphology, structure, and light reflectivity of glazes of archeological sherds were systematically studied. A large number of ε-Fe2O3 dendritic crystals were observed in the glazes. Alkali etching was implemented to remove the glassy matrix surrounding these crystals to further investigate their microstructure. SEM observations emphasize that they are composed of well-arranged parallel branches separated by about 230 nm, each of which consisting of offset stacks of many small flake-shaped crystals, with the offset ranging from 100 to 110 nm. Based on these results, the origin of the reddish-brown color and high gloss was discussed. In addition, cordierite crystals were observed for the first time in the sauce glaze from Yaozhou kilns. |
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| Keywords: | Yaozhou kilns Sauce glaze Microstructure Alkali etching method |
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