Thermal stability and percolation threshold of Ge-Se-Fe glasses

Autor(en): Saffarini, G.
Saiter, J. M.
Matthiesen, J.
Stichwörter: CHALCOGENIDE GLASSES; chalcogenides; CHEMICAL-THRESHOLDS; CONNECTIVITY; CONSTRAINT THEORY; COORDINATION-NUMBER; ELASTIC PROPERTIES; FLOPPY MODES; Ge-Se-Fe; glasses; Materials Science; Materials Science, Multidisciplinary; NETWORK GLASSES; Phillips'-Thorpe threshold; Physics; Physics, Applied; RIGIDITY PERCOLATION; thermal stability; TRANSITION TEMPERATURE
Erscheinungsdatum: 2007
Volumen: 61
Ausgabe: 2
Startseite: 432
Seitenende: 436
The characteristic temperatures such as the glass transition temperature (T-g), the onset temperature of crystallization (T-c) and the melting temperatures, (T-m) have been determined for glasses belonging to the GexSe100-x-yFey (y=2, 4 and 6 at.%). Differential scanning calorimetry and differential thermal analysis measurements have been used for their determination. These temperatures have been used to evaluate the thermal stability of the investigated glassy alloys using Dietzel (Delta T) and Hruby (H-r) criteria, The variations of Delta T and H-r with the average coordination number, n, have been specified. It is found that both Delta T and H-r exhibit a maximum at n=2.4. This observation is a realization of Phillips'-Thorpe threshold where the maximum stability of the network is just obtained if the percolation threshold limit is reached. The overall mean bond energies of the studied compositions have also been calculated and their correlation with the glass transition temperature is discussed. (c) 2006 Elsevier B.V. All rights reserved.
ISSN: 0167577X
DOI: 10.1016/j.matlet.2006.04.075

Show full item record

Page view(s)

Last Week
Last month
checked on Mar 1, 2024

Google ScholarTM