Chromium in lead metasilicate glass: solubility, valence, and local environment via multiple spectroscopy
| Autor: | Ronaldo Santos da Silva, Valmor Roberto Mastelaro, Edgar Dutra Zanotto, Benjamin J.A. Moulton, T.R. Cunha, D.C. Silva, D.V. Sampaio, Rafaella B. Pena, Marcos V. dos S. Rezende, Paulo S. Pizani |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
Valence (chemistry) Process Chemistry and Technology Inorganic chemistry Doping Nucleation chemistry.chemical_element ESPECTROSCOPIA RAMAN Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Chromium symbols.namesake chemistry Materials Chemistry Ceramics and Composites symbols Solubility Spectroscopy Raman spectroscopy |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | In this article the doping of chromium in a lead metasilicate glass is explored using Raman, UV–Vis, and Cr K-edge XANES spectroscopy. Our results indicate that the Cr ions are predominantly present as CrO42− complexes, with a minor amounts of Cr(III). The solubility of Cr is limited to ∼1 mol % Cr2O3. This boundary was inferred from the intensity changes to the CrO42− stretching vibrations and confirmed by the inability to produce a homogeneous glass containing 2 mol % Cr2O3. The establishment of the solubility limit of Cr in lead glasses is important to design more effective glass compositions depending on the desired application. Finally, this low solubility indicates that Cr2O3 could be used as a potential nucleating agent for lead-silica based glass-ceramics. |
| Databáze: | OpenAIRE |
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