CLUSTER MODEL OF GLASS-TRANSITION - THE VARIATION OF T(G) WITH CAGE VIBRATIONAL FREQUENCY OF NA+ IONS IN SODIUM BOROVANADATE GLASSES

Authors
MUTHUPARI S RAO KJ
Citation
S. Muthupari et Kj. Rao, CLUSTER MODEL OF GLASS-TRANSITION - THE VARIATION OF T(G) WITH CAGE VIBRATIONAL FREQUENCY OF NA+ IONS IN SODIUM BOROVANADATE GLASSES, Chemical physics letters, 223(1-2), 1994, pp. 133-138
Citations number
22
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
Chemical physics letters → ACNP
ISSN journal
00092614
Volume
223
Issue
1-2
Year of publication
1994
Pages
133 - 138
Database
ISI
SICI code
0009-2614(1994)223:1-2<133:CMOG-T>2.0.ZU;2-I
Abstract
The cage vibrational frequencies of Na+ ions in sodium borovanadate gl asses have been examined using far-infrared spectroscopy. The glass tr ansition temperature, T(g), is found to vary linearly with the cage vi brational frequency, nu. The variation of nu has been related to the a verage excess partial charge on the cage oxygen atoms and hence to the force constant. The observed linear variation of T(g) as a function o f nu has been rationalized on the basis of the cluster model of glass transition.