Network former mixing effects in alkali germanotellurite glasses: A vibrational spectroscopic study

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dc.contributor.authorMöncke, Doris
dc.contributor.authorTagiara, Nagia S.
dc.contributor.authorChatzipanagis, Konstantinos I.
dc.contributor.authorBradtmüller, Henrik
dc.contributor.authorRodrigues, Ana C. M.
dc.contributor.authorKamitsos, Efstratios I.
dc.date.accessioned2021-10-27T20:51:47Z
dc.date.available2021-10-27T20:51:47Z
dc.date.issued2021-06
dc.descriptionThis is the Accepted Manuscript of the following article: Tagiara, N. S., Chatzipanagis, K. I., Bradtmüller, H., Rodrigues, A. C. M., Möncke, D., & Kamitsos, E. I. (2021). Network Former Mixing Effects in Alkali Germanotellurite Glasses: A Vibrational Spectroscopic Study. Journal of Alloys and Compounds, 160782., which has been published in final form at https://doi.org/10.1016/j.jallcom.2021.160782. This manuscript version is made available under the CC BY-NC-ND 4.0 license.en_US
dc.description.abstractAlkali 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.en_US
dc.description.sponsorshipThis work was supported by the project “National Infrastructure in Nanotechnology, Advanced Materials and Micro-/Nanoelectronics” (MIS 5002772), which is funded by the Operational Program “Competitiveness, Entrepreneurship and Innovation” (NSRF 2014–2020) and co-financed by Greece and the EU (European Regional Development Fund). We also acknowledge the financial support of FAPESP grant (São Paulo Research Foundation, number 2017/02953–6 and 2013/07793, CeRTEV-CEPID program). HB is grateful for support from the São Paulo Research Foundation (FAPESP) (grant number 2019/26399–3), as well as the Deutsche Forschungsgemeinschaft (DFG).en_US
dc.identifier.citationTagiara, N. S., Chatzipanagis, K. I., Bradtmüller, H., Rodrigues, A. C. M., Möncke, D., & Kamitsos, E. I. (2021). Network Former Mixing Effects in Alkali Germanotellurite Glasses: A Vibrational Spectroscopic Study. Journal of Alloys and Compounds, 882, 160782. https://doi.org/10.1016/j.jallcom.2021.160782en_US
dc.identifier.urihttp://hdl.handle.net/10829/24670
dc.language.isoen_USen_US
dc.publisherElsevieren_US
dc.relation.urihttps://doi.org/10.1016/j.jallcom.2021.160782en_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.titleNetwork former mixing effects in alkali germanotellurite glasses: A vibrational spectroscopic studyen_US
dc.typeJournal Articleen_US

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