Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Vibrational study of thermally ion-exchanged sodium aluminoborosilicate glasses
Δημιουργός/Συγγραφέας:	Stavrou E. [EL] Παλλές, Δημήτρης[EN] Palles, Dimitris [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I. Lipovskii A. Tagantsev D. Svirko Y. Honkanen S.
Εκδότης:	Elsevier
Ημερομηνία:	2014
Γλώσσα:	Αγγλικά
ISSN:	0022-3093
DOI:	10.1016/j.jnoncrysol.2013.12.017
Περίληψη:	Thermally ion-exchanged M+-for-Na+ (M = K and Ag) aluminoborosilicate glasses were obtained from the glass (SiO2) 60(B2O3)10(Al2O 3)6(Na2O)20.2(ZrO2) 3.7(Sb2O3)0.1 (in mol%) and studied by infrared reflectance and micro-Raman spectroscopy. The results of both techniques are consistent with local structural rearrangements induced by ion-exchange below glass transition temperature, Tg, and are expressed for the silicate network by the chemical equilibrium Q2 + Q4⇔2Q3 where Qn represents a silicate tetrahedron with n bridging oxygen atoms. Replacement of Na+ by K+ was found to shift this equilibrium to the right, while the introduction of Ag+ ions causes the opposite effect. Micro-Raman depth profiling showed that these structural changes occur within a layer whose thickness depends on the type of the guest cation and the conditions of ion-exchange; the thickness is about 50 μm for Ag+ ions exchanged at 340 °C for 180 min and about 40 μm for K+ exchanged at 325°C for 6 h.
Τίτλος πηγής δημοσίευσης:	Journal of Non-Crystalline Solids
Τόμος/Κεφάλαιο:	401
Σελίδες:	232-236
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	Glass structure Infrared Ion-exchange Raman
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2013 Elsevier B.V.
Σημειώσεις:	Russian Foundation for Basic Research, РФФИ: 12-02-91664; Academy of Finland: 267270; General Secretariat for Research and Technology, GSRT: 12RUS-11-206 Support of this work by the ERA.Net RUS project AN2 (EU/FP7), the General Secretariat for Research and Technology , Greece (project 12RUS-11-206), the Russian Foundation for Basic Research (project 12-02-91664) and the Academy of Finland (project 267270).
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο