Márcia Vilarigues, Andreia Ruivo, Thijs Hagendijk, Mario Bandiera, Mathilda Coutinho, Luis C. Alves, Sven Dupré
{"title":"Red glass in Kunckel's Ars Vitraria Experimentalis: The importance of temperature","authors":"Márcia Vilarigues, Andreia Ruivo, Thijs Hagendijk, Mario Bandiera, Mathilda Coutinho, Luis C. Alves, Sven Dupré","doi":"10.1111/ijag.16605","DOIUrl":"10.1111/ijag.16605","url":null,"abstract":"<p>The role of the melting conditions and furnaces used to the obtained final colors has always been a question raised when investigating formulations and recipes of historical glasses. The focus of the present work is the reproduction of three recipes of red enamel glass of the manuscript by Neri, <i>L'arte vetraria</i> (1612) following the translation and comments by Kunckel's in <i>Ars Vitraria Experimentalis</i> (1679). The reproductions include the production of each individual compound of the selected recipes following instructions, and the final glass production in electric and wood-fire furnaces to assess the effect of different melting conditions. A multianalytical approach was used to fully characterize the produced samples allowing the study of the enamel chemical composition, color, crystals formations, and thermal properties. The results indicate that no significant color differences may be attributed to the melting conditions. However, it revealed that the samples produced in the electric furnace at 1200°C present a high crystallinity degree and the formation of white crystals at room temperature in a short period of time. The formation of crystals on glass is critical, and historically, to avoid it, these recipes must have been made at temperatures between 1050 and 1100°C.</p>","PeriodicalId":13850,"journal":{"name":"International Journal of Applied Glass Science","volume":"14 2","pages":"201-215"},"PeriodicalIF":2.1,"publicationDate":"2022-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44407484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Anne Jans Faber, Mathi Rongen, Domingos De Sousa Meneses
{"title":"High-temperature near-IR spectral properties and thermal radiation conductivity of (un)colored silicate glass melts","authors":"Anne Jans Faber, Mathi Rongen, Domingos De Sousa Meneses","doi":"10.1111/ijag.16603","DOIUrl":"10.1111/ijag.16603","url":null,"abstract":"<p>Using an emittance technique with a fast CO<sub>2</sub> laser heating of glass samples, the high-temperature absorption spectra in the near-infrared region of ultrapure and colored (Co-, Cu-, Mn-, and Ni-doped) glasses are measured. The effects of higher glass temperatures on these absorption spectra are explained in the framework of the ligand field theory. Thus, the temperature-dependent absorption bands of the previous transition metal ions are assigned to electronic transitions among the ligand field energy levels of these ions. In particular, spectral shifts, spectral broadening, and changes in absorption strength are ascribed to changes in the structural symmetry of the ionic sites in the glass matrix and to changes of the ligand field strength at increasing temperatures.</p><p>Besides, the temperature-dependent Rosseland mean absorptions of the sulfate fined soda lime silicate glass melts, colored with the previous transition metal ions, are derived from the absorption spectra. Combining all the data, semiempirical correlations are derived, which predict the Rosseland thermal radiation properties as a function of glass temperature and of glass redox chemistry. The latter property involves the temperature-dependent concentration of the specific valency of the coloring ions, determined independently, e.g. by a Gibbs minimization redox calculation tool.</p>","PeriodicalId":13850,"journal":{"name":"International Journal of Applied Glass Science","volume":"14 2","pages":"189-200"},"PeriodicalIF":2.1,"publicationDate":"2022-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44458665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}