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Regensburg 2004 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 29: Glasses II (joint session DF/DY)

DY 29.4: Vortrag

Dienstag, 9. März 2004, 15:30–15:45, H23

Short-range order fluctuations and the boson peak in simulated amorphous NiZr — •M. Guerdane and H. Teichler — Institut für Materialphysik, Universität Göttingen

The boson peak is a striking feature in the vibration spectrum of glassy systems. We here present results from molecular dynamics simulations for Ni30Zr70, relating the boson peak of the system to local fluctuations in the short-range order. Analysis of the topology around Ni atoms in the system shows that Ni in the amorphous state on average has a coordination number <Z>=9, where in detail a mixture of perfect or slightly distorted trigonal prisms (TP, Z=9) or archimedean antiprisms (AAP, Z=10) and environments with Z=8 predominate. Both TP and AAP represent the basic structural units in the crystalline intermetallic compounds NiZr (B33-Type) and NiZr2 (C16-Type) respectively. We show that the boson peak in the amorphous NiZr system is related to fluctuations in time between local environments of different coordination numbers Z.

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