Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 459, Issue -, Pages 184-191Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2017.01.016
Keywords
Electron microscopy; Pigments; Glaze; Color alteration; Chromium oxides
Funding
- Reseau Francilien sur les oxydes fonctionnels (DIM Oxymore)
- Region Ile-de-France
- Region Ile de France grant SESAME [I-07-593/R]
- INSU-CNRS
- INP-CNRS
- University Pierre et Marie Curie - Paris 6
- French National Research Agency (ANR) [ANR-07-BLAN-0124-01]
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Spinel ZnAl2O4 and corundum Al2O3 doped with chromium are used as pink pigments in porcelain glazes. However, alteration of the color can occur during firing, and the resulting glaze appears brown and green respectively, instead of the expected pink. To investigate the mechanism of color change, electron transparent sections were prepared by Focused Ion Beam (FIB) at the interface between pigment and glaze. Observations under a transmission electron microscope (TEM) reveal a common mechanism for both systems. Al migration from the pigment towards the silicate melt results in alteration of the grain of pigments, and formation of a Cr enriched phase, with the same crystalline structure than the initial pigment. Furthermore, the formation of anorthite is reported, due to the increase of the local concentration of Al in the melt. The different morphologies of altered grains of pigment encountered in the glaze are discussed base on the TEM observations. (C) 2017 Elsevier B.V. All rights reserved.
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