A composition dependent thermal behavior of GexSe35-xTe65 glasses


Autoria(s): Prashanth, SB Bhanu; Asokan, S
Data(s)

01/07/2009

Resumo

Alternating differential scanning calorimetric (ADSC) studies have been performed to understand the thermal behavior of bulk GexSe35-xTe65 glasses (17 <= x <= 25); it is found that the glasses with x <= 20 exhibit two crystallization exotherms (T-c1 & T-c2). On the other hand, those with x >= 20.5, show a single crystallization reaction upon heating. The exothermic reaction at T-c1 has been found to correspond to the partial crystallization of the glass into hexagonal Te and the reaction at T-c2 is associated with the additional crystallization of rhombohedral Ge-Te phase. The glass transition temperature of GexSe35-xTe65 glasses is found to show a linear but not-steep increase, indicating a progressive, but a gradual increase in network connectivity with Ge addition. It is also found that T-c1 of GexSe35-xTe65 glasses with x <= 20, increases progressively with Ge content and eventually merges with T-c2 at x approximate to 20.5 (< r > = 2.41); this behavior has been understood on the basis of the reduction in Te-Te bonds of lower energy and increase in Ge-Te bonds of higher energy, with increasing Ge content. Apart from the interesting composition dependent crystallization, an anomalous melting behavior is also exhibited by the GexSe35-xTe65 glasses.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/22265/1/pdf.pdf

Prashanth, SB Bhanu and Asokan, S (2009) A composition dependent thermal behavior of GexSe35-xTe65 glasses. In: Journal Of Non-Crystalline Solids, 355 (22-23). pp. 1227-1230.

Publicador

Elsevier Science

Relação

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TXM-4WH3BFG-3&_user=512776&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000025298&_version=1&_urlVersion=0&_userid=512776&md5=3b0f3fb5a86034b6d82006da621148be

http://eprints.iisc.ernet.in/22265/

Palavras-Chave #Instrumentation and Applied Physics (Formally ISU)
Tipo

Journal Article

PeerReviewed