Thermally reversing window and stiffness transitions in chalcogenide glasses

Citation
D. Selvanathan et al., Thermally reversing window and stiffness transitions in chalcogenide glasses, SOL ST COMM, 111(11), 1999, pp. 619-624
Citations number
29
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE COMMUNICATIONS
ISSN journal
00381098 → ACNP
Volume
111
Issue
11
Year of publication
1999
Pages
619 - 624
Database
ISI
SICI code
0038-1098(1999)111:11<619:TRWAST>2.0.ZU;2-P
Abstract
Raman scattering and temperature-modulated differential scanning calorimetr y measurements on SixSe1-x glasses show that onset of rigidity occurs over a wide compositional window 0.20 < x < 0.27 across which glass transitions are found to be thermally reversing in character. There is a ten-fold reduc tion in the non-reversing heat flow at the transition within the window in relation to that outside the window. The large compositional width associat ed with the onset of rigidity in this chalcogenide glass is in sharp contra st to the solitary transition predicted by mean-field constraint counting a nd by existing numerical simulations in random networks. (C) 1999 Elsevier Science Ltd. All rights reserved.