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Harmonic behavior of metallic glasses up to the metastable melt

Meyer, A. and Wuttke, J. and Petry, W. and Peker, A. and Bormann, R. and Coddens, G. and Kranich, L. and Randl, O. G. and Schober, H. (1996) Harmonic behavior of metallic glasses up to the metastable melt. Physical Review B, 53 (18). pp. 12107-12111. ISSN 0163-1829. doi:10.1103/PhysRevB.53.12107.

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In two amorphous alloys ZrTiCuNiBe and ZrAlNiCu coherent neutron scattering has been measured over five decades in energy, including measurements in the metastable melt of a metallic alloy more than 80 K above Tg. In the vibrational spectra a pronounced "boson" peak is found: Even in crystallized samples the density of states exceeds the Debye ω2 model, and in the amorphous state low-frequency vibrations are further enhanced. The peak position shows no dispersion in q, while intensities are strongly correlated with the static structure factor. Over the full energy range the temperature dependence is strictly harmonic. From high-energy resolution measurements we establish lower bounds for the temperatures at which structural α and fast β relaxation become observable.

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Additional Information:©1996 The American Physical Society Received 3 November 1995 This work has been supported by the Deutsche Forchungsgemeinschaft (SPP Unterkühlte Metallschmelzen). We thank A. Magerl and G. Vogl for help in the development of new IN10 analyzers, G. André and C. Ritter for neutron-diffraction measurements, and W. Doster for a critical reading of the manuscript.
Issue or Number:18
Record Number:CaltechAUTHORS:MEYprb96
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ID Code:6433
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Deposited On:08 Dec 2006
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