Specific heat of Zr65Al7.5Cu17.5Ni10 around the glass transition

Citation
B. Reinker et al., Specific heat of Zr65Al7.5Cu17.5Ni10 around the glass transition, EUR PHY J B, 7(3), 1999, pp. 359-364
Citations number
13
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
EUROPEAN PHYSICAL JOURNAL B
ISSN journal
14346028 → ACNP
Volume
7
Issue
3
Year of publication
1999
Pages
359 - 364
Database
ISI
SICI code
1434-6028(199902)7:3<359:SHOZAT>2.0.ZU;2-U
Abstract
Dynamic calorimetric measurements are performed for the quaternary metallic glass Zr65Al7.5Cu17.5Ni10 in order to analyse the dependence on different heating rates for the glass transition temperature T-g. We compare two diff erent temperature programs used for sample relaxation, to estimate the infl uence of the thermal history on T-g. A lower limit for the glass transition temperature T-g was calculated according to two different models based on the fact, that width and temperature of the glass transition depend on the experimental time scale set by the heating rate: One model assumes a Vogel- Fulcher-Tammann type behaviour, as used to describe more or less "fragile" glass formers and the other assumes an Arrhenius-like behaviour, which is r elated to "strong" glass formers. The values obtained from both models diff er by about 80K. From additional absolute specific heat capacity measuremen ts we calculate the Kauzmann temperature T-K, as a lower limit for the temp erature of the glass transition from thermodynamic aspects. Comparing T-K W ith the temperature values obtained from the two evaluation models we can c lassify the quaternary metallic glass Zr65Al7.5Cu17.Ni-5(10) to behave more like a "strong" glass former.