Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 544

Full Record for Micrograph 544

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Micrograph no
544
Brief description
Devitrified Glass: glass sample heated at 900°C for 17 hours
Keywords
ceramic Link to MATTER Glossary entry for ceramic, devitrification Link to MATTER Glossary entry for devitrification, glass Link to MATTER Glossary entry for glass, silica
Categories
Ceramic
System
SiO2
Composition
Mostly silica, SiO2
Standard codes
Reaction
Processing
Flat glass is produced using the Float Glass Process. Samples were heated at 900°C for 17 hours to induce devitrification.
Applications
Sample preparation
Thin section
Technique
Transmitted polarised light microscopy, with sensitive tint plate
Length bar
250 μm
Further information
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 543, which shows the same sample rotated through 45°.
Contributor
Dr K M Knowles
Organisation
Department of Materials Science and Metallurgy, University of Cambridge
Date
01/10/02
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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