Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Mixed barium-lead borate glasses studied by optical and vibrational spectroscopy
Δημιουργός/Συγγραφέας:	Othman H.A. Herrmann A. Möncke D.
Εκδότης:	Blackwell Publishing Inc.
Ημερομηνία:	2019
Γλώσσα:	Αγγλικά
ISSN:	2041-1286
DOI:	10.1111/ijag.13100
Περίληψη:	Glasses of the ternary lead-barium borate series (70−x) B2O3–30 BaO–xPbO with x = 0.05 to 30 mol% were studied for their optical properties by photoluminescence (PL) and UV-Vis absorption spectroscopy. Variations in the s-p transition of Pb2+ were followed as variations of the lead content and varying optical basicities of the glass. The UV cutoff of the undoped glass sample is observed at about 340 nm and increasing PbO addition results in a red shift of the optical absorption edge to 480 nm for the glass with x = 30 mol%. In lead barium borate glasses, the emission intensity increases up to 4 mol% PbO before decreasing at higher PbO levels. Additionally, the series was studied regarding structural variations by Raman and infrared spectroscopy. The fraction of tetrahedrally coordinated [BO4/2]− and of trigonal borate units with nonbridging oxygen atoms (metaborate and pyroborate) increases with PbO addition. The molar volume of the prepared glasses is found to increase with increasing lead content. The glass basicity, as determined from the composition, correlates well with the position of the lead excitation band.
Τίτλος πηγής δημοσίευσης:	International Journal of Applied Glass Science
Τόμος/Κεφάλαιο:	10
Τεύχος:	3
Σελίδες:	339-348
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	Borate glass Pb2+ fluorescence photoluminescence Raman spectroscopy s-p transition
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2019 The American Ceramic Society and Wiley Periodicals, Inc
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο