Potassium-rich ash-based glass is typical of medieval glass windows used in the Central Europe since 1000 A. D.. Glasses withmedieval-like composition were prepared with different amounts of K2O (15–20–25 K2O weight%) using recipes deduced fromarchaeometric literature. Raman data of these samples were interpreted on the basis of the Qn units model and of the polymerization index Ip and confirm a close dependence of glass depolymerization on the potassium content. Generally, K-basedglasses have high alteration sensitivity to pollutants conveyed by liquid or vapour water (rain, humidity and fog). In this work,the glass alteration processes were studied in terms of structural modifications related to the glass K content. Leaching andnetwork dissolution were investigated by attack with boiling concentrated sulfuric acid and by exposure to high temperatureand high pressure bidistilled water, respectively. The weight loss and alteration layer thickness were measured. The structuralchanges in the glass network and the presence of neoformation crystallized products were determined through linear Ramanmaps on altered glass cross sections. The more the glass network structure is depolymerized, the more the surface chemicalattack is facilitated. The results obtained for the model glasses are comparedwith those for a set of ancient K-rich glass fragments.

Raman study of model glass with medievalcompositions: artificial weathering andcomparison with ancient samples / DE FERRI, Lavinia; D., Bersani; Colomban, P. h.; P. P., Lottici; G., Simon; Vezzalini, Maria Giovanna. - In: JOURNAL OF RAMAN SPECTROSCOPY. - ISSN 0377-0486. - STAMPA. - -:(2012), pp. ---. [10.1002/jrs.4103]

Raman study of model glass with medievalcompositions: artificial weathering andcomparison with ancient samples

DE FERRI, LAVINIA;VEZZALINI, Maria Giovanna
2012

Abstract

Potassium-rich ash-based glass is typical of medieval glass windows used in the Central Europe since 1000 A. D.. Glasses withmedieval-like composition were prepared with different amounts of K2O (15–20–25 K2O weight%) using recipes deduced fromarchaeometric literature. Raman data of these samples were interpreted on the basis of the Qn units model and of the polymerization index Ip and confirm a close dependence of glass depolymerization on the potassium content. Generally, K-basedglasses have high alteration sensitivity to pollutants conveyed by liquid or vapour water (rain, humidity and fog). In this work,the glass alteration processes were studied in terms of structural modifications related to the glass K content. Leaching andnetwork dissolution were investigated by attack with boiling concentrated sulfuric acid and by exposure to high temperatureand high pressure bidistilled water, respectively. The weight loss and alteration layer thickness were measured. The structuralchanges in the glass network and the presence of neoformation crystallized products were determined through linear Ramanmaps on altered glass cross sections. The more the glass network structure is depolymerized, the more the surface chemicalattack is facilitated. The results obtained for the model glasses are comparedwith those for a set of ancient K-rich glass fragments.
2012
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Raman study of model glass with medievalcompositions: artificial weathering andcomparison with ancient samples / DE FERRI, Lavinia; D., Bersani; Colomban, P. h.; P. P., Lottici; G., Simon; Vezzalini, Maria Giovanna. - In: JOURNAL OF RAMAN SPECTROSCOPY. - ISSN 0377-0486. - STAMPA. - -:(2012), pp. ---. [10.1002/jrs.4103]
DE FERRI, Lavinia; D., Bersani; Colomban, P. h.; P. P., Lottici; G., Simon; Vezzalini, Maria Giovanna
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/736670
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