Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Second‐harmonic generation and structural rearrangements in multicomponent antimonite glasses by electrothermal poling
Δημιουργός/Συγγραφέας:	Topper, Brian Tagiara, Nagia S. [EL] Παλλές, Δημήτρης[EN] Palles, Dimitris Lind, Felix Baazouzi, Mourad Soltani, Mohamed Toufik Wondraczek, Lothar Möncke, Doris [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I.
Ημερομηνία:	2023
Γλώσσα:	Αγγλικά
ISSN:	0002-7820 1551-2916
DOI:	10.1111/jace.19073
Περίληψη:	Electrothermal poling is shown here to effectively induce second-order nonlinear effects in heavy-metal oxide antimonite glasses. In M2O–PbO–WO3–Sb2O3 (M = Li, Na, K) glasses, the poling-induced second-harmonic generation intensity is five times larger than in silica (Infrasil) for M = Na, twice as large as in silica for M = Li, and smaller than in silica for M = K. X-ray photoelectron spectroscopy suggests that antimony ions exist predominantly in the trivalent oxidation state in the studied glass samples. Raman and infrared spectroscopy confirm that the glass network is comprised of SbO3, WO4, WO6, and PbO4 units—with some SiO4 moieties due to leaching from the silica crucible. The WO4 units appear to exist in two distinct sites, as evidenced by comparison of the vibrational spectra of alkali–tungsten–antimonite glasses with those of previously reported crystalline tungstate phases. The alkali type influences the equilibrium between tetrahedral tungstate anions, [WO4]2−, and the isomeric partially polymerized octahedral tungstate units, [WØ4O2]2− (Ø denotes a bridging oxygen). Raman spectroscopy line scans were used to track near-surface structural changes on the anode side of poled glasses. They reveal that the tungstate equilibrium is also affected by poling. At the anode side, the population of partially polymerized [WØ4O2]2− species increases at the expense of anionic [WO4]2− species. This yields a net increase in the average bond length of the network forming constituents, which is commensurate with poling-induced structural changes observed in other systems experimentally and computationally.
Τίτλος πηγής δημοσίευσης:	Journal of the American Ceramic Society
Τόμος/Κεφάλαιο:	106
Τεύχος:	7
Θεματική Κατηγορία:	[EL] Φασματοσκοπία[EN] Spectroscopy [EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	electrothermal poling glass structure infrared Raman second-harmonic generation tungsten–antimonite glasses
Κάτοχος πνευματικών δικαιωμάτων:	© 2023 The American Ceramic Society
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1111/jace.19073
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο