청자 유약 발색메카니즘에 대한 뫼스바우어 분광법에 의한 연구

Abstract

Systematic study on relationship between celadon coloring and glaze component was conducted by chromaticity analysis and Mossbauer spectroscopic analysis. The chromaticity (L * , a * , b * values) and Mossbauer analysis results were correlated to the amount of Fe₂O₃, TiO₂, MnO, and P₂O?, which are the essential factors influencing celadon coloring. According to chromaticity analysis, celadon glaze color belongs to GY group when the addition of TiO₂ was 1.4%, whereas the color belongs to BG group when the addition of TiO₂ was 0.1%. For the GY group, the colors change from GY to YR with the decrease of brightness as the addition of TiO₂, MnO, and P₂O? increases. According to Mossbauer analysis results, as the amount of divalent iron ion increases, the a * and b * values decrease, on the other hand, L * value increases. The ratio of divalent iron ion produced in reductive sintering process is found to be 80~95% in this study, which induces the increase of L * values in celadon glaze.