Chromium in lead metasilicate glass: Solubility, valence, and local environment via multiple spectroscopy. Issue 1 (1st January 2022)

• Record Type: Journal Article
• Authors: Sampaio, David V.; Pena, Rafaella B.; Moulton, Benjamin J.A.; Rezende, Marcos V.; Silva, Deyvid do C.; Silva, Ronaldo S.; da Cunha, Thiago R.; Mastelaro, Valmor R.; Zanotto, Edgar D.; Pizani, Paulo S.
• Is Part Of: Ceramics international. Volume 48:Issue 1(2022)
• Page Start: 173
• Page End: 178
• Publication Date: 2022-01-01
• Subjects: Cr-doped glass -- Lead silicate -- Raman spectroscopy -- XANES -- UV–Vis; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.08.377
• Languages: English
• ISSNs: 0272-8842

Abstract

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 CrO4 2− complexes, with a minor amounts of Cr(III). The solubility of Cr is limited to ∼1 mol % Cr2 O3 . This boundary was inferred from the intensity changes to the CrO4 2− stretching vibrations and confirmed by the inability to produce a homogeneous glass containing 2 mol % Cr2 O3 . 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 Cr2 O3 could be used as a potential nucleating agent for lead-silica based glass-ceramics.