Chromium in lead metasilicate glass: Solubility,valence, and local environment via multiple spectroscopy |
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| Affiliation: | 1. Universidade Federal de São Carlos, Departamento de Física, Caixa Postal 676, 13565-905, São Carlos, SP, Brazil;2. Universidade Federal de Alagoas, Instituto de Física, 57072-900, Maceió, AL, Brazil;3. Grupo de Nanomateriais Funcionais, Departamento de Física, Universidade Federal de Sergipe, 49100-000, São Cristóvão, SE, Brazil;4. Instituto de Física de São Carlos, Universidade de São Paulo, 565-905, São Carlos, SP, Brazil;5. Universidade Federal de São Carlos, Departamento de Engenharia de Materisais, Caixa Postal 676, 13565-905, São Carlos, SP, Brazil |
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| Abstract: | 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. |
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| Keywords: | Cr-doped glass Lead silicate Raman spectroscopy XANES UV–Vis |
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