Mechanism of lustre formation in scheelite-based glazes

This work elucidates the mechanism responsible for the lustre effect of scheelite-based glazes for single-firing wall tiles. The surface decoration is obtained with a thin film composed of a Si–Ca–Zn–Al–K–B frit and 10wt% WO3 on zircon-engobed substrates for single-firing wall tiles (maximum tempera...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2013-10, Vol.33 (11), p.2055-2064
Main Authors: Gualtieri, Alessandro F., Canovi, Lorenzo, Viani, Alberto, Bertocchi, Paolo, Corradini, Cecilia, Gualtieri, Magdalena Lassinantti, Gazzadi, Gian Carlo, Zapparoli, Mauro, Berthier, Serge
Format: Article
Language:English
Subjects:
Adamantine
Condensed Matter
Glassy
Glaze
Glazes
Lustre
Microstructure
Nanocrystals
Pearlescence
Physics
Scheelite
Tiles
Tungsten oxides
Walls
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Summary:This work elucidates the mechanism responsible for the lustre effect of scheelite-based glazes for single-firing wall tiles. The surface decoration is obtained with a thin film composed of a Si–Ca–Zn–Al–K–B frit and 10wt% WO3 on zircon-engobed substrates for single-firing wall tiles (maximum temperature of 1130°C for 50min). The observed lustre effect is sub-adamantine and pearlescent. It is sub-adamantine because scheelite nanocrystals at the surface, with a relatively high refractive index (n=1.93), cause considerable reflection of light. The lustre is also weakly pearlescent because the nano-crystals oriented with the (004) plane parallel to the surface give interference with the underlying glassy layer (n≈1.5), where randomly dispersed scheelite crystals occur. This model apparently applies to the glazes decorated with ceria, although the latter exhibits iridescence due to the high refractive index of ceria (n=2.05) which yields stronger interference effect with the underlying glassy substrate.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2013.03.018