The wood ash-based glass (PLS, potash-lime-silica), employed for medieval cathedral windows in Northern Europe since 1000 A.D., is particularly sensitive to the alteration phenomena. Three PLS medieval-like glass were produced with different K2O content and characterized by FT-IR and Raman spectroscopy. Aging experiments were carried out by sulfuric acid and water, checking, in this last case, the pH over time. The weight loss and the alteration layer thickness were measured and the interacting solutions were analyzed through AAS. Raman maps were recorded on the altered glass cross sections. Changes in the glass network structure were observed and the presence of neo-formation products was determined.
Aging of PLS-glass: Study of the alteration phenomena / De Ferri, L.; Bersani, D.; Colomban, P. h.; Lottici, P. P.; Simon, G.; Vezzalini, Maria Giovanna. - STAMPA. - 1:(2011), pp. 103-105. (Intervento presentato al convegno GLASSAC11, Glass science in art and conservation tenutosi a Bronnbach Monastery, Germany nel 10-12 May 2011).
Aging of PLS-glass: Study of the alteration phenomena.
VEZZALINI, Maria Giovanna
2011
Abstract
The wood ash-based glass (PLS, potash-lime-silica), employed for medieval cathedral windows in Northern Europe since 1000 A.D., is particularly sensitive to the alteration phenomena. Three PLS medieval-like glass were produced with different K2O content and characterized by FT-IR and Raman spectroscopy. Aging experiments were carried out by sulfuric acid and water, checking, in this last case, the pH over time. The weight loss and the alteration layer thickness were measured and the interacting solutions were analyzed through AAS. Raman maps were recorded on the altered glass cross sections. Changes in the glass network structure were observed and the presence of neo-formation products was determined.
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