Weathering Phenomena on Naturally Weathered Potash-Lime-Silica-Glass with Medieval Composition Studied by Secondary Electron Microscopy and Energy Dispersive Microanalysis |
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Authors: | Gebhard Woisetschläger Myriam Dutz Sabine Paul Manfred Schreiner |
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Institution: | (1) Institute of Analytical Chemistry, Vienna University of Technology, Vienna, AT;(2) Institute of Chemistry, Academy of Fine Arts, Vienna, AT |
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Abstract: | Samples of two model glasses with chemical compositions similar to medieval stained glass were exposed to the natural environment
at 23 test sites for a period of 6 months, 1 and 2 years within an exposure programme of the “Working Group of Effects on
Materials, Including Historic and Cultural Monuments” of the Economic Commission for Europe of the United Nations. During
the exposure the environmental data were measured and collected at each test site in order to enable a correlation between
the pollutant load in the ambient atmosphere and the weathering phenomena of the glass samples. After the exposure, which
was performed in a sheltered as well as in an unsheltered mode for gaining information about the influence of dry and wet
deposition of air pollutants, the glass samples were analysed in the scanning electron microscope with energy dispersive microanalysis
(SEM/EDX). Model glass M1 – a potassium rich glass – was covered to a high amount with crystalline weathering products (above
all syngenite), whereas glass M3 – a glass with a higher Ca and Si content – turned out to be more stable against weathering.
This glass was covered with gypsum and arcanite crystals but in total to a less extent than glass M1.
Received March 30, 1998. Revision February 8, 2000. |
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Keywords: | : Glass potash-lime-silica-glass scanning electron microscopy (SEM) energy dispersive analysis weathering glass corrosion |
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