Title :

Raman scattering boson peak and differential scanning calorimetry studies of the glass transition in tellurium–zinc oxide glasses

Author(s) :

Stavrou, E. [Auteur]
Tsiantos, C. [Auteur]
Tsopouridou, R.D. [Auteur]
Kripotou, S. [Auteur]
Kontos, A.G. [Auteur]
Institute of Physical Chemistry "Demokritos" [IPC]
Raptis, C. [Auteur correspondant]
CAPOEN, Bruno [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Centre d'Etudes et de Recherches Lasers et Applications [CERLA]
Bouazaoui, M. [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Centre d'Etudes et de Recherches Lasers et Applications [CERLA]
Turrell, S. [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Centre d'Etudes et de Recherches Lasers et Applications [CERLA]
Khatir, S. [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Centre d'Etudes et de Recherches Lasers et Applications [CERLA]

Journal title :

Journal of Physics: Condensed Matter

Pages :

195103-1 - 195103-10

Publisher :

IOP Publishing

Publication date :

2010

ISSN :

0953-8984

HAL domain(s) :

Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Chimie/Chimie théorique et/ou physique
Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]

English abstract : [en]

Raman scattering and differential scanning calorimetry (DSC) measurements have been carried out on four mixed tellurium–zinc oxide (TeO₂)_{1 − <i>x</i>}(ZnO)_<i>x</i> (<i>x</i> = 0.1, 0.2, 0.3, ...
Show more >Raman scattering and differential scanning calorimetry (DSC) measurements have been carried out on four mixed tellurium–zinc oxide (TeO₂)_{1 − <i>x</i>}(ZnO)_<i>x</i> (<i>x</i> = 0.1, 0.2, 0.3, 0.4) glasses under variable temperature, with particular attention being given to the respective glass transition region. From the DSC measurements, the glass transition temperature T_<i>g</i> has been determined for each glass, showing a monotonous decrease of Tg with increasing ZnO content. The Raman study is focused on the low-frequency band of the glasses, the so-called boson peak (BP), whose frequency undergoes an abrupt decrease at a temperature T_<i>d</i> very close to the respective T_<i>g</i> values obtained by DSC. These results show that the BP is highly sensitive to dynamical effects over the glass transition and provides a means for an equally reliable (to DSC) determination of T_<i>g</i> in tellurite glasses and other network glasses. The discontinuous temperature dependence of the BP frequency at the glass transition, along with the absence of such a behaviour by the high-frequency Raman bands (due to local atomic vibrations), indicates that marked changes of the medium range order (MRO) occur at T_<i>g</i> and confirms the correlation between the BP and the MRO of glasses.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Non spécifiée

Popular science :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL