Image icon  Terracotta pottery, showing the glaze on the surface

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Description: Terracotta can be made in large shapes due to the fact that a large part of the raw materials has been prefired, so firing shrinkage is low. The characteristic red colour is due to the presence of iron (II) oxide. The glaze is mostly SiO2, and is applied to render the surface impermeable to liquids and gases, and to provide a readily cleanable surface which protects the terracotta.
Keywords: ceramic • clay • glaze • grog • SiO2 • terracotta
Categories: Science approaches > Microstructure
Materials > Ceramics & glasses > Fired clays > Terracotta
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: DoITPoMS, University of Cambridge
Dr K M Knowles, Department of Materials Science and Metallurgy, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 09 August 2002
Date added: 21 August 2009
Resource ID: 1217