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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:36 |
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Conference: Bucharest University Faculty of Physics 2005 Meeting
Section: Solid State Physics and Materials Science
Title:
A simple microscopic method for the evaluation of sound
velocity in intermetallic ribbons.
Authors:
R. Stavarus1, M.Bulinski1, G.Scinteie2, A.Jianu2 and V.Kuncser2
Affiliation:
1University of Bucharest, Faculty of Physics, 77125, Bucharest-Magurele, Romania
2National Institute of Materials Physics, 77125, Bucharest-Magurele, Romania.
E-mail
radustavarus@yahoo.com
Keywords:
Abstract:
The atomic vibration of amorphous alloys has attracted a great deal of interest because of the excess vibration density of states at the low energy region (< 10 meV), known as the boson peak. For a correct characterization of the boson peak intensity, the sound velocity in such alloys has to be estimated.
Amorphous intermetallics are currently obtained as thin films and ribbons, with at least one dimension of mesoscopic level (e.g the thickness of the film/ribbon). The determination of the sound velocity in such systems is not a facile task and generally involves a complex methodological procedure (e.g. by measuring the resonant frequency of a magnetoelastic coated sensor). This work reports on a simple method for the determination of the sound velocity in amorphous ribbons, based on the determination of the Young modulus via the Hook low.
The intermatallic ribbons (with thickness of tenths of mm) were obtained by the melt spinning method. The elongations of the ribbons via weights of fractional N were observed under an optical Microscope. The procedure was initially calibrated on a thin W wire. The obtained Young modules are in the range from 40 to 70 GPa and the sound velocities in the range from 2000 to 3000 m/s. The results are not sensitive to low variation in the amorphous composition, but rather to the parameters of the melt spinning procedure.
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