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Münster 1999 – wissenschaftliches Programm

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M: Metallphysik

M 3: Quasikristalle I

M 3.8: Vortrag

Montag, 22. März 1999, 12:30–12:45, S 9

Temperature dependence of Phonon DOS in decagonal Al70Co15Ni15 — •Hamid Elhor, Marek Mihalkovic, and Jens-Boie Suck — Materialforschung und Flüssigkeiten, Institut für Physik,
TU Chemnitz, D-09107 Chemnitz.
We performed detailed analysis of the recently measured temperature dependence of the generalised vibrational density of states in decagonal quasicrystal Al70Co15Ni15.
Using a periodic approximant as an atomic structure model for the quasicrystal and a spring-constant model which we fitted in harmonic approximation to the room temperature GVDOS, we obtained the partial Aluminiu m and transition metal phonon DOS. Using these partials we were able to recover the Al70Co15Ni15 phonon DOS from the experimental GVDOS, and by means of an iterative Monte Carlo simulation we reconstructed the temperature dependence of the frequency-shift patterns related to the expansion of the sample.
As a result we calculated quantities like the sound velocity, the Grüneisen parameter, the Debye-Waller factor and the phonon contribution to the heat capacity and entropy. Some of these quantities can be compared directly with other independent experiments.

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