Raman and DSC studies of fragility in tellurium-zinc oxide glass formers

Stavrou, E; Kripotou, S; Raptis, C; Turrell, S; Syassen, K

dc.contributor.author	Stavrou, E	en
dc.contributor.author	Kripotou, S	en
dc.contributor.author	Raptis, C	en
dc.contributor.author	Turrell, S	en
dc.contributor.author	Syassen, K	en
dc.date.accessioned	2014-03-01T02:03:10Z
dc.date.available	2014-03-01T02:03:10Z
dc.date.issued	2011	en
dc.identifier.issn	18626351	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29358
dc.subject	Boson peak	en
dc.subject	Fragility	en
dc.subject	Glass transition	en
dc.subject	Tellurite glasses	en
dc.subject.other	Arrhenius	en
dc.subject.other	Boson peaks	en
dc.subject.other	DSC studies	en
dc.subject.other	Fragility	en
dc.subject.other	Glass former	en
dc.subject.other	Glass forming oxides	en
dc.subject.other	High pressure	en
dc.subject.other	High pressure Raman	en
dc.subject.other	High temperature	en
dc.subject.other	Low-frequency Raman scattering	en
dc.subject.other	Oxide glass	en
dc.subject.other	Tellurite glass	en
dc.subject.other	ZnO	en
dc.subject.other	Bosons	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Glass	en
dc.subject.other	Raman scattering	en
dc.subject.other	Tellurium	en
dc.subject.other	Tellurium compounds	en
dc.subject.other	Zinc	en
dc.subject.other	Zinc oxide	en
dc.subject.other	Glass transition	en
dc.title	Raman and DSC studies of fragility in tellurium-zinc oxide glass formers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/pssc.201000719	en
heal.identifier.secondary	http://dx.doi.org/10.1002/pssc.201000719	en
heal.publicationDate	2011	en
heal.abstract	Raman scattering and differential scanning calorimetry (DSC) measurements have been carried out in four mixed (TeO2)1-x(ZnO)x (x = 0.1, 0.2, 0.3, 0.4) glasses at high temperatures (Raman and DSC through the glass transition) and high pressures (Raman) with the aim of determining the fragility of these glass forming oxides. Four different criteria, corresponding to four parameters, were applied to assess the fragility of the glasses. From the DSC studies, we have obtained the fragility parameter m which corresponds to the slopes of Arrhenius (lnQ vs. 1/Tg, were Q is the heating rate) plots, and the glass transition width ΔTg. Also, from the low-frequency Raman scattering, and in particular the boson peak intensity of the glasses at Tg, we have estimated the fragility ratio rR (Tg) = Imin/Imax whose value serves as another (empirical) fragility criterion. Finally, from high pressure Raman measurements on the glasses, we have estimated the Grüneisen parameter γT for each glass, which constitutes the fourth fragility parameter adopted in this work. Considering the four parameters ΔTg, m, r (Tg) and γT and the generally accepted (empirical) fragility criteria, we conclude that the mixed tellurium-zinc oxides constitute strong-to-intermediate glass formers. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.	en
heal.journalName	Physica Status Solidi (C) Current Topics in Solid State Physics	en
dc.identifier.doi	10.1002/pssc.201000719	en
dc.identifier.volume	8	en
dc.identifier.issue	11-12	en
dc.identifier.spage	3039	en
dc.identifier.epage	3042	en