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Abstract
Using niobium crucibles for melting phosphate and silicate glasses of various modifier oxide contents, and therefore varying optical basicity (Λ), was found to result in varying dissolution rates of niobate during melting. Because of their high electronic polarizability, even small concentrations of niobates are detectable in the Raman spectra of glasses. Even less than 1 mol% Nb2O5 can be identified, as independently confirmed by SEM‐EDX analysis. Silica‐rich glasses (~60 % SiO2, Λ~0.6) did not show significant Nb dissolution from the crucible, while higher basicity metasilicate glasses (~ 50% SiO2, Λ~0.65) and pyrophosphate glasses (~30% P2O5, Λ~0.7) did show the typical niobate signature in the Raman spectra at 810‐840 cm‐1, depending on composition. While niobium is well dissolved throughout the pyrophosphate glass, metasilicate glasses showed a much more intense Raman signature of niobate units near the outer surface of the glass. Measurements along the cross section of a fractured metasilicate glass showed a steady decrease of the strength of the niobate signature from the surface toward the bulk of the material. Besides correlation with optical basicity, the tendency of melts to dissolve Nb crucible was discussed in terms of the connectivity or polymerization of the network and the corresponding melt viscosity.
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Authors (4)
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Sharafat Ali profesor
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Efstratios Kamitsos profesor
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Doris Möncke profesor
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1111/ijag.16505
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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International Journal of Applied Glass Science
no. 13,
pages 121 - 134,
ISSN: 2041-1286 - Language:
- English
- Publication year:
- 2022
- Bibliographic description:
- Wójcik N., Ali S., Kamitsos E., Möncke D.: Niobate in silicate and phosphate glasses: Effect of glass basicity on crucible dissolution// International Journal of Applied Glass Science -Vol. 13,iss. 1 (2022), s.121-134
- DOI:
- Digital Object Identifier (open in new tab) 10.1111/ijag.16505
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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