Crystallization kinetics of glassy Se-Te-Sn alloys

The present article deals with the differential thermal analyses (DTA) study of Se-Te glasses containing Sn. DTA runs are taken at six different heating rates (5, 10, 15, 18, 20, and 22 K [min.sup.-1]). The crystallization data are examined in terms of modified Kissinger, Mahadevan method, and Augis and Bennett approximation for the non-isothermal crystallization. Results of DTA under non-isothermal conditions on the glasses of the [Se.sub.80][Te.sub.20-x][Sn.sub.x] (x = 3 and 9) are reported and discussed at different heating rates. The glass transition temperatures ([T.sub.g]), the onset crystallization temperatures ([T.sub.c]), and the peak temperature of crystallization ([T.sub.p]) were found to be dependent on the compositions and the heating rates. From the dependence on heating rates of ([T.sub.g]) and ([T.sub.p]) the activation energy for glass transition ([E.sub.g]) and the activation energy for crystallization ([E.sub.c]) are calculated and their composition dependence discussed. PACS Nos.: 81.70.Pg, 65.60.+a, 61.43.Dq. Nous presentons ici des etudes d'analyse thermique differentielle (DTA) de verres Se-Te contenant du Sn. Les mesures DTA sont prises a six differents taux de chauffage (5,10,15,18, 20 et 22 K [min.sup.-1]). Nous examinons les donnees de cristallisation en utilisant les methodes de Kissinger et de Mahadevan et l'approximation de Augis et Bennett pour une cristallisation non isotherme. Nous presentons et discutons, a differents taux de chauffage, nos resultats DTA sous condition non isotherme pour les verres [Se.sub.80][Te.sub.20-x][Sn.sub.x] (x = 3 et 9). Nous observons que la temperature de transition verre ([T.sub.g]), la temperature du debut de la cristallisation ([T.sub.c]) et la temperature pic de cristallisation ([T.sub.p]) dependent de la composition et du taux de chauffage. A partir de la dependance sur le taux de chauffage de [T.sub.g] et de [T.sub.p], nous calculons l'energie d'activation ([E.sub.g]) pour la transition verre et l'energie d'activation pour la cristallisation ([E.sub.c]) et nous discutons de leur dependance sur la composition. [Traduit par la Redaction]
1. Introduction Chalcogenide glasses are made up of group VI elements (S, Se, and Te) of the periodic table. These glasses behave as semiconducting materials. During the past year, an [...]