Study of Phonon Eigenfrequencies in Metallic Glasses

Abstract

The density fluctuations in terms of phonon eigenfrequencies are studied in NisoZrso and C U~~T I~~ metallic glasses using two different theoretical approaches. The calculated results of phonon eigenfrequencies show all the main characteristic features of the dispersion curves. The effective intcratornic interactions are studied in terms of a pair potential using the extended theory of the Wills-Harrison potential which includes the effect of d-band electrons. Finally, from the low wave-vector transfer region of the dispersion curves, some thermodynamical properties are also calculated which are in agreement with each other.

Phonon Dispersion in Amorphous Ni-Alloys

“…The present results of Ni 33 Y 67 glass are found lower in line with other theoretical data [1]. Also the present outcome of Ni 50 Zr 50 glass shows lower results in comparison with the theoretical reported data [2]. The inclusion of various local field corrections with static H-local field correction function is found The dielectric function plays an important role in the evaluation of potential due to the screening of the electron gas.…”

“…The presently calculated pair potentials of Ni 50 Zr 50 glass are observed in Fig. 1d along with the other such available theoretical data [2,17]. The position of pair potentials at r = r 0 due to H-function occurs at r 0 = 3.62 a.u, while the influence of screenings suppresses this zero slightly and occurs at r 0 ≤ 3.55 a.u.…”

“…The broad well width is seen due to inclusion of local field correction functions. It is seen that well depth of presently computed pair potentials is shifted towards the left and is as high as compared to the outcomes of Gupta et al [2] and Hausleitner-Hafner [17]. The computed pair potentials of Ni 60 Nb 40 glass are displayed in Fig.…”

“…And only recently there has been an explosion of interest to these studies as more promising materials are produced in the amorphous form. The range of applications of metallic glasses is vast and extends from the common window glass to high capacity storage media for digital devices [1][2][3][4][5][6][7][8].…”

“…The phonon dynamics of Ni 33 Y 67 glass was studied by Arun Pratap et al [1], by Hubbard-Beeby (HB) [3], and Takeno-Goda (TG) [4] approaches. The vibrational dynamics of Ni 50 Zr 50 glass has been studied by Gupta et al [2] using…”