Measurement of optical transmittance: A novel method for determination of the glass transition temperature of transparent glasses

A light beam thermal analysis (LBTA) has been applied for determination of the glass transition region (Tg) of Y2O3-Al2O3-SiO2 glasses containing between 0 and 20 mol% of CaO. The temperature dependence of the optical transmittance of glass plates with parallel surfaces and with controlled surface r...

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Bibliographic Details
Published in:Ceramics (Praha) 2002-01, Vol.46 (2), p.74-78
Main Authors: LICHVAR, Peter, GALUSEK, Dusan, MAJLING, Jan, LISKA, Marek
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Glasses (including metallic glasses)
Materials science
Materials testing
Nondestructive testing: optical methods
Physics
Specific materials
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Summary:A light beam thermal analysis (LBTA) has been applied for determination of the glass transition region (Tg) of Y2O3-Al2O3-SiO2 glasses containing between 0 and 20 mol% of CaO. The temperature dependence of the optical transmittance of glass plates with parallel surfaces and with controlled surface roughness was determined. Healing of defects on the glass surface by viscous flow in the temperature region close to Tg was observed, resulting in increased transmission of visible light through the specimen. The Tg values measured by LBTA are in good agreement with the results obtained by DTA. 6 refs.
ISSN:0862-5468