Within the framework of a project aimed to develop protective coatings for antique glass windows, three glass varieties of medieval-like composition were prepared using recipes deduced from archaeometric studies and different amounts of potassium for fluxing (15–20–25 K2O wt.%). Batches were melted in mullite crucibles using an electric furnace at 1350 °C, the glass was fast cooled in air and annealed at temperatures 20 °C higherthan the sample glass transition temperatures (726, 702 and 683 °C for V1, V2 and V3, respectively). The chemical composition of the glasswas determined by X-Ray Fluorescence Spectroscopy (XRF) and the glass transition temperature was checked by differential thermal analysis (DTA). X-Ray Powder Diffraction (XRPD) data and vibrational spectroscopic experiments (FT-IR and Raman) revealed a direct dependence of glass de-polymerization on potassiumcontent. In particular, the Raman datawere interpreted on the basis of SiO4 structural units Qn andthe polymerization index Ip.

Structural and vibrational characterization of medieval like glass samples / De Ferri, Lavinia; D., Bersani; A., Lorenzi; P. P., Lottici; A., Montenero; Vezzalini, Maria Giovanna; G., Simon. - In: JOURNAL OF NON-CRYSTALLINE SOLIDS. - ISSN 0022-3093. - STAMPA. - 358(2012), pp. 814-819.

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