The wood based glass (PLS, Potash-Lime-Silica), employed for medieval cathedral windows in Northern Europe since 1000 A.D., in particularly sensitive to the alteration phenomena. Three PLS medieval-like glasses were produced with different K2O contents and characterized by Ft-IR and Raman spectroscopy. Ageing experiments were carried out by sulfuric acid and water, checking, in this last case, the pH over time. The woight loss and the alteration layer thickenss 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.
Ageing of PLS glass: study of the alteration phenomena
L. de Ferri
Writing – Original Draft Preparation
;
2011-01-01
Abstract
The wood based glass (PLS, Potash-Lime-Silica), employed for medieval cathedral windows in Northern Europe since 1000 A.D., in particularly sensitive to the alteration phenomena. Three PLS medieval-like glasses were produced with different K2O contents and characterized by Ft-IR and Raman spectroscopy. Ageing experiments were carried out by sulfuric acid and water, checking, in this last case, the pH over time. The woight loss and the alteration layer thickenss 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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