Vibrational dynamics of Zr-based bulk metallic glasses

Abstract

The vibrational dynamics of some Zr-based bulkmetallic glasses were studied at room temperature in terms of phonon eigen frequencies of longitudinal and transverse modes employing three different approaches proposed by Hubbard-Beeby (HB), Takeno-Goda (TG) and Bhatia-Singh (BS). The well recognized model potential is employed successfully to explain electron-ion interaction in the metallic glass. The present findings of phonon dispersion curve are found to be in fair agreement with available theoretical as well as experimental data. The thermodynamic properties obtained by the HB and TG approaches are found to be much lower than those obtained by the BS approach.

Vibrational dynamics of Fe-based glassy alloys

“…The vibrational dynamics of this glass was studied by Bhandari et al [11] employing Hubbard-Beeby (HB) [12] and Bhatia-Singh (BS) [13] approaches. They have also calculated the temperature dependence electrical resistivity of Fe 90 Zr 10 . Also, the structural study of Fe 90 Zr 10 glass was made by Hausleitner and Hafner [14] using the MD technique.…”

“…The atomic dynamics of Fe 80 P 20 glass has been studied by Hausleitner and Hafner [17]. Recently, we have reported the vibrational properties of some metallic glasses using model potential formalism [1][2][3][4][5][6][7][8][9][10].…”

“…Fe 90 Zr 10 , Fe 80 B 20 , Fe 83 B 17 and Fe 80 P 20 using well known and well recognized model potentials [1][2][3][4][5][6][7][8][9][10]. The thermodynamics and elastic properties of longitudinal sound velocity υ L , transverse sound velocity υ T , isothermal bulk modulus B T , modulus of rigidity G, Poisson's ratio , Young's modulus Y and Debye temperature D are computed from the elastic limit of the dispersion relation.…”

“…The phenomenological theories of Hubbard-Beeby [12], Takeno-Goda (TG) [26,27] and Bhatia-Singh [13,28] are employed to generate the PDC. The most important ingredient of the PDC is pair potential computed theoretically in Wills-Harrison (WH) [29] form from well recognized model potentials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

“…The well recognized model potential W B ðqÞ [1][2][3][4][5][6][7][8][9][10] used in the present computation of phonon dynamics of binary metallic glasses is of the form Here U ¼ qr C $r C is the model potential parameter. This form has the feature of a Coulombic term outside the core and varying cancellation due to repulsive and attractive contributions to the potential within the core in real space.…”