Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Network former mixing effects in alkali germanotellurite glasses: A vibrational spectroscopic study
Δημιουργός/Συγγραφέας:	Tagiara, Nagia S. Chatzipanagis, Konstantinos Bradtmüller, H. Rodrigues, A.C.M. Möncke, D. [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I.
Εκδότης:	Elsevier
Ημερομηνία:	2021
Γλώσσα:	Αγγλικά
ISSN:	09258388
DOI:	10.1016/j.jallcom.2021.160782
Περίληψη:	Alkali germanotellurite glasses of composition 0.3M2O–0.7[(1-x)GeO2–xTeO2], M=Li, Na and 0 ≤ x ≤ 1, were investigated by Raman and infrared vibrational spectroscopic techniques to search for the origins of the alkali ion-dependent network former mixing (NFM) effect in these ion-conducting glasses. The vibrational spectra measured on mixed network-former glasses, and the spectral comparison between equimolar-mixed glasses (x = 0.5) and pellet-mixtures of the endmember glasses, 0.3M2O–0.7GeO2 and 0.3M2O–0.7TeO2, provided evidence for the formation of hetero-atomic Ge–O–Te linkages and structural rearrangements in the germanate and tellurite components of the glass. The mixing-induced structural rearrangements were expressed in terms of chemical equilibria between the network-building units and were used to make qualitative predictions for changes in the network cross-linking density and the related network-strain energy, as well as in the binding energy part of the activation energy for ion conduction. Thus, it is proposed that the mixing-induced structural modifications in the germanate and tellurite parts of glass cause the cancelation of changes in the binding energy and the network-strain energy contributions to the activation energy for ion transport. These qualitative predictions were discussed in the context of the previously found absence of an NFM effect in ionic conductivity for M=Na and the presence of a weak positive NFM effect for M=Li.
Τίτλος πηγής δημοσίευσης:	Journal of Alloys and Compounds
Τόμος/Κεφάλαιο:	882
Σελίδες:	160782
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy [EL] Χημεία (Γενικά)[EN] Chemistry (General)
Λέξεις-Κλειδιά:	Tellurite glasses Germanate glasses Network former mixing Raman spectroscopy Infrared spectroscopy Ion-conducting glasses
Κάτοχος πνευματικών δικαιωμάτων:	© 2021 Elsevier B.V. All rights reserved.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1016/j.jallcom.2021.160782
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο