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A Preliminary Study on the Roles of Fe Content and Neoformed Ca-rich Minerals in the Coloration of Ceramic Glazes

  • Lee, Min Hye (Department of Heritage Conservation and Restoration, Graduate School of Cultural Heritage, Korea National University of Cultural Heritage) ;
  • Han, Min Su (Department of Heritage Conservation and Restoration, Graduate School of Cultural Heritage, Korea National University of Cultural Heritage) ;
  • Kim, Ji Hye (Department of Heritage Conservation and Restoration, Graduate School of Cultural Heritage, Korea National University of Cultural Heritage)
  • Received : 2020.08.04
  • Accepted : 2020.08.18
  • Published : 2020.08.20

Abstract

Iron oxides are the essential coloring oxides in traditional ceramic glazes. However, when Fe is involved in the coloration in the form of ions or colloids in glazes with low Fe content, it is difficult to identify the iron oxide phases. Generally, in many these glazes, Ca-rich minerals are observed by X-ray diffraction (XRD) or microscopic images, owing to their devitrification by the high Ca content. This study attempts to elucidate the correlation between the crystalline structure and coloration in the glazes while mainly focusing on neoformed Ca-rich minerals and Fe content. An experimental firing was carried out to produce tree ash glazes, with pine tree ash and Buyeo feldspar. In the case of oxidation glazes, the scanning electron microscopy (SEM) images and XRD patterns did not exhibit any Ca-rich crystals, and all the visible light reflectance spectra lines exhibited a similar shape. In contrast, the reduction glazes divided into blue glazes and other colored glazes according to the shapes of their reflectance spectra. It was confirmed that the influence of Ca-rich minerals on the glaze color was more pronounced than the blue color of the reduction glazes when the Ca and feldspar contents were sufficiently high and low, respectively, to form wollastonite. As the Ca content increased and the elemental composition of the reduction glazes changed, the neoformation of the Ca-rich minerals, such as wollastonite, anorthite, diopside, and akermanite was sequentially observed.

Keywords

References

  1. Carter, E.A., Wood, M.L., de Waal, D. and Edwards, H.G.M., 2017, Porcelain shards from Portuguese wrecks: Raman spectroscopic analysis of marine archaeological ceramics. Heritage Science, 5(17).
  2. Choi, Y.D., 2016, A convergence study on the ash glaze manufacturing process - Analysis of pH changes appearing in the ash glaze elutriation process. Korea Science & Art Forum, 25, 427-438. (in Korean with English abstract)
  3. Ham, S.W., Shim, I.W., Lee, Y.E., Kang, J.Y. and Koh, K.S., 2002, An archaeological microstructural study on Koryo inlaid celadon. Bulletin of the Korean Chemical Society, 23(11), 1531-1540. https://doi.org/10.5012/bkcs.2002.23.11.1531
  4. Hwang, C.O., 2008, A study on the effects of $Fe^{2+}$ and $Fe^{3+}$ on the iron glaze coloring. Master's thesis, Myongji University, Seoul, 43-49. (in Korean with English abstract)
  5. Jeon, A.Y., No, H.G., Kim, U.S., Cho, W.S., Kim, K.J., Kim, J.Y., Kim, C.M., Kim, C.S. and Kang, G.I., 2011, Systematic study on colorative mechanism of ancient Goryeo celadon glaze by mossbauer spectroscopy and chromaticity analysis. Journal of the Korean Ceramic Society, 49(1), 66-71. (in Korean with English abstract) https://doi.org/10.4191/kcers.2012.49.1.066
  6. Kim, J.Y., No, H.G., Jeon, A.Y., Kim, U.S., Cho, W.S., Kim, K.J., Kim, C.M. and Kim C.S., 2010, Mossbauer spectroscopic study on colorative mechanism of celadon glaze. Journal of the Korean Ceramic Society, 48(1), 34-39. (in Korean with English abstract) https://doi.org/10.4191/KCERS.2011.48.1.034
  7. Lee, H.Y., 2008, Type and origin of the domestic leading feldspar mines: Jecheon and Buyeo mine. Journal of the Korean Earth Science Society, 29(7), 640-644. (in Korean with English abstract) https://doi.org/10.5467/JKESS.2008.29.7.640
  8. Lee, S.W. and Cho, I.M., 2013, Study on clay and glaze ingredient analysis of Incheon Gyeongseodong green celadon. The Journal of the Korean Society of Ceramic Art, 10(2), 103-116. (in Korean with English abstract)
  9. Lim, S.H., 2013, Development of black pigment and physical property enhancement for Geryong Mountain Buncheong ware on the basis of analysis of Chulwha pieces. Doctoral dissertation, Myongji University, Seoul, 30-34. (in Korean with English abstract)
  10. Park, J.H., 2018, A study on the changing properties of iron oxides in black glazes using Raman microscope: Focused on black glazes excavated in Shinan shipwreck. Master's thesis, Korea National University of Cultural Heritage, Buyeo, 37-52. (in Korean with English abstract)
  11. Pyon, K.R., 2005, A Study on the Coloration of Iron Glazes by Red Clay and Natural Stone. The Journal of the Korean Society of Ceramic Art, 1, 103-116. (in Korean with English abstract)
  12. Trindade, M.J., Dias, M.I., Coroado, J. and Rocha, F., 2009, Mineralogical transformations of calcareous rich clays with firing: A comparative study between calcite and dolomite rich clays from Algarve, Portugal. Applied Clay Science, 42, 345-355. https://doi.org/10.1016/j.clay.2008.02.008