Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Modification of silicophosphate glass composition, structure, and properties via crucible material and melting conditions
Δημιουργός/Συγγραφέας:	Sawangboon, Nuttawan Nizamutdinova, Alina Uesbeck, Tobias Limbach, René Meechoowas, Ekarat Tapasa, Kanit Möncke, Doris Wondraczek, Lothar [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I. Wüllen, Leo Brauer, Delia S.
Εκδότης:	John Wiley & Sons, Ltd
Ημερομηνία:	2020
Γλώσσα:	Αγγλικά
ISSN:	2041-1286 2041-1294
DOI:	10.1111/ijag.13958
Περίληψη:	Ceramic crucibles are known to corrode in contact with glass melts. Here, we investigate the effect of alumina and fused silica crucibles on the composition, structure, and properties of silicophosphate glasses. Glasses in the system 0.3 Na2O-0.6 P2O5-0.1 SiO2 were melted in platinum, alumina, or fused silica crucibles at 900°C or 1200°C for 0.5-12 hours. Al2O3 and SiO2 were found to leach from the crucibles into the glass melt and alter the glass composition: Al2O3 content increased with melting temperature and time, resulting in up to 10 mol% Al2O3; SiO2 from fused silica crucibles was also introduced into the glass, resulting in a 25% higher SiO2 content compared to the nominal composition. Glass density, transition temperature, thermal expansion, and mechanical properties were strongly affected by these compositional changes. Based on vibrational spectroscopy, this is explained by increasing numbers of P–O–Al or P–O–Si bonds, resulting in a depolymerization of the phosphate network, and ionic cross-linking by high field strength aluminum or silicon ions. With increasing alumina content, P–O–Si bonds were replaced by P–O–Al bonds. 31P and 27Al MAS NMR spectra revealed that aluminum is present in sixfold coordination exclusively and fully bonded to phosphate species, connecting phosphate groups by P–O–Al–O–P bonds.
Τίτλος πηγής δημοσίευσης:	International Journal of Applied Glass Science Special Issue: Phosphate Glasses and General Glass Science
Τόμος/Κεφάλαιο:	11
Τεύχος:	1
Σελίδες:	46-57
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy [EL] Χημεία (Γενικά)[EN] Chemistry (General)
Λέξεις-Κλειδιά:	Crucible material IR spectroscopy Raman spectroscopy Silicophosphate glass Sixfold‐coordinated Si Solid‐state NMR spectroscopy
Κάτοχος πνευματικών δικαιωμάτων:	Copyright © 2019 The Authors. International Journal of Applied Glass Science published by American Ceramics Society (ACERS) and Wiley Periodicals, Inc.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://ceramics.onlinelibrary.wiley.com/doi/10.1111/ijag.13958
Ηλεκτρονική διεύθυνση περιοδικού (link) :	https://ceramics.onlinelibrary.wiley.com/journal/20411294
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο