Issue |
Europhys. Lett.
Volume 68, Number 2, October 2004
|
|
---|---|---|
Page(s) | 226 - 232 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2004-10193-6 | |
Published online | 01 October 2004 |
Indications for an “excess wing” in metallic glasses
from the mechanical loss modulus in
1
I. Physikalisches Institut, Georg-August-Universität Göttingen Tammannstr. 1, 37077 Göttingen, Germany
2
Experimentalphysik V, Institut für Physik, Universität Augsburg Universitätsstr. 2, 86135 Augsburg, Germany
Received:
11
June
2004
Accepted:
24
August
2004
The temperature-dependent complex shear modulus G* of an
amorphous, 300 thick
film
is measured using a double-paddle oscillator as a substrate,
oscillating in its torsional eigenmode at about 5440
. At
high temperatures, the loss modulus is dominated by viscous flow
that leads to an α-relaxation peak in the temperature
domain. We calculate this peak for our metallic system using the
Havriliak-Negami function for the mechanical loss in combination
with the Vogel-Fulcher-Tammann equation to describe the
temperature-dependent characteristic relaxation time. In the
vicinity of the glass transition, we observe a clear experimental
deviation from this calculated α-process, which we consider
as first indication for the existence of an “excess wing” in
metallic systems.
PACS: 64.70.Pf – Glass transitions / 62.40.+i – Anelasticity, internal friction, stress relaxation, and mechanical resonances / 61.25.Mv – Liquid metals and alloys
© EDP Sciences, 2004
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