Image icon  Devitrified Glass: glass sample heated at 900°C for 17 hours

 
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Description: During the devitrification process, the glass changes from being completely amorphous to partially crystalline, as it adsorbs moisture from the atmosphere. Devitrified glass has a frosty or cloudy, iridescent appearance. Devitrification occurs naturally over long periods of time, but can be induced by heating to high temperatures for prolonged periods of time. Compare this micrograph with micrograph ID 544, which shows the same sample rotated through 45°.
Keywords: ceramic • devitrification • glass • silica • displacement • indentation • Plasticine
Categories: Science approaches > Microstructure
Materials > Ceramics & glasses > Glasses
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Dr K M Knowles, Department of Materials Science and Metallurgy, University of Cambridge
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 01 October 2002
Date added: 21 August 2009
Package: DoITPoMS Micrograph Library
Resource ID: 1576