Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Niobate in silicate and phosphate glasses: Effect of glass basicity on crucible dissolution
Δημιουργός/Συγγραφέας:	Wójcik, Natalia A. Ali, Sharafat [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I. Möncke, Doris
Εκδότης:	The American Ceramic Society
Ημερομηνία:	2022-01
Γλώσσα:	Αγγλικά
DOI:	10.1111/ijag.16505
Περίληψη:	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 detect-able in the Raman spectra of glasses. Even <1 mol% Nb2O5can 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 spec-tra 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 polym-erization of the network and the corresponding melt viscosity.
Τίτλος πηγής δημοσίευσης:	International Journal of Applied Glass Science
Τόμος/Κεφάλαιο:	13
Σελίδες:	121-134
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	Scrucible dissolution Niobate in glasses Optical basicity Phosphate and silicate glasses Raman spectroscopy
Κάτοχος πνευματικών δικαιωμάτων:	2021 The Authors. International Journal of Applied Glass Science published by American Ceramics Society (ACERS) and Wiley Periodicals LLC
Ηλεκτρονική διεύθυνση με ανοικτή πρόσβαση (link):	https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/ijag.16505
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο