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Full Record for Micrograph 543
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- Micrograph no
- 543
- Brief description
- Devitrified Glass: glass sample heated at 900°C for 17 hours
- Keywords
- ceramic
, devitrification , 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 544, 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- Related micrographs