Influence of Iron Oxide on Coloration and Crystallization Behavior of Jian Kiln Oil-Spot Glaze

Abstract

Abstract: Jian kiln oil-spot glaze is one of the most typical iron crystal precipitation glazes in ancient China, and it is important to clarify the influence of iron oxide on precipitation glazes coloration and crystal precipitation, to provide a scientific basis and theoretical guidance for the development and innovation of iron crystal precipitation glazes with a variety of coloration effects. In this paper, XRD, Raman, SEM and EDS testing methods were used to investigate the microstructure of the precipitated crystals in glaze melt and the change rules of glaze coloration with different iron oxide content, and to reveal the mechanism of the glaze crystal structure on coloration. The results show that with the increase of iron oxide content, the glaze surface precipitates brownish-yellow, silver-blue, silver-white, silver-white and reddish-brown crystal spots, and the crystal spots are colored by chemical color and structural color coupling effect of crystals. The iron enrichment in the middle area of crystal spot is higher than that in edge area, and the phase change from ε-Fe₂O₃ to α-Fe₂O₃ takes place preferentially, forming different color effects. The middle area first precipitates 2~4 μm leaf-shaped ε-Fe₂O₃ crystals, with brownish yellow. With the increase of iron oxide content, the glaze layer precipitates with the glaze surface parallel to the directional arrangement of rod-shaped α-Fe₂O₃ crystals to form crystalline thin film, which produces a strong reflection of light, being silver-white. When the iron oxide continues to increase, the glaze precipitation of 10~20 μm dendritic α-Fe₂O₃ crystals penetrates the crystalline thin film, the structural color (silver) produced by the film is weakened, and the chemical color of α-Fe₂O₃ (reddish brown) is enhanced. The coupling is silver-white with reddish brown. The edge area first precipitates a large number of 30~50 nm grains, resulting in Rayleigh scattering as blue. With the increase of iron oxide content, the surface layer of rod-like crystals also forms a crystal film and the lower layer of film precipitates 100~200 nm plate nanocrystals to form amorphous photonic crystals. The coherent scattering is blue, and the reflected silver-white is coupled with silver blue.

Key words: iron oxide, oil-spot glaze, amorphous photonic crystal, structural color, chemical color, crystallization

CLC Number:

TQ174

JIANG Caishui, ZHOU Jianer, FANG Yuan, LIU Kun, BAO Qifu, WU Junming. Influence of Iron Oxide on Coloration and Crystallization Behavior of Jian Kiln Oil-Spot Glaze[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2269-2278.

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