Micrograph Library
Browse the libraryAdvanced searchSystemsCompositionsTechniquesKeywordsPhase diagramsHelpPreferencesAbout the micrograph libraryTerms of useContribute micrographs!FeedbackLinksCredits Print this page
Full Record for Micrograph 650
[88 KB]
View micrograph
.. in new window
View micrograph and record
.. in new window
You can also view and download the micrographs on Flickr
- Micrograph no
- 650
- Brief description
- Small ceramic pot showing centimetre scale crystals within the glaze
- Keywords
- ceramic
, crystalline glaze, devitrification , willemite - Categories
- Ceramic
- System
- Soda-lime-silica glaze
- Composition
- Soda-lime-silica glaze containing zinc oxide 25, cobalt oxide 0.5 (wt%)
- Standard codes
- Reaction
- Processing
- See Further information
- Applications
- Sample preparation
- Technique
- Photography (no microscope)
- Length bar
- 20 mm
- Further information
- Careful heat treatment of the glaze produces a very small number of willemite (zinc orthosilicate, Zn2SiO4) nuclei which can grow to centimetre dimensions over the course of a few hours at a suitably high temperature. Cobalt in the glaze composition segregates preferentially to the willemite crystals, colouring them blue.
- Contributor
- Dr K M Knowles
- Organisation
- Department of Materials Science and Metallurgy, University of Cambridge
- Date
- 04/11/02
- Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales- Related micrographs