Abstract
In order to explain the origin of the deep red color of copper glazes on ceramics, a ceramist has elaborated, by firing under reducing atmosphere, a significant number of tiles. The analysis of the structure and composition of a representative sample by transmission electron microscopy and electron energy loss spectroscopy, followed by an optical characterization and an optical modeling using the radiative transfer approach (four-flux model), have enabled a comprehensive explanation of the origin of the color in these glazes: the presence of two families of copper nanoparticles in the vitreous matrix. The first, purely absorbing, of diameter 10–50 nm, essentially creates color by a subtractive process. The second, due to its larger diameter, 100 nm or more, mainly acts on color by scattering of the visible light. Both act competitively in the layer. A color chart of all the hues which can be reached by this technique has eventually been theoretically calculated.
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Acknowledgements
P.A.C. wishes to thank Daniel Steen (HEI, Lille) and Wahib Saikhaly (CP2M, Marseille) for their help, respectively, in tile optical measurements and in EELS studies.
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Cuvelier, P.A., Andraud, C., Chaudanson, D. et al. Copper red glazes: a coating with two families of particles. Appl. Phys. A 106, 915–929 (2012). https://doi.org/10.1007/s00339-011-6707-3
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DOI: https://doi.org/10.1007/s00339-011-6707-3