Vibrational dynamics of non-crystalline glassy alloys |
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Authors: | Aditya M Vora |
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Affiliation: | (1) Parmeshwari 165, Vijaynagar Area, Hospital Road, Bhuj-Kutch, 370001 Gujarat, India |
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Abstract: | The vibrational dynamics of three Ca-based non-crystalline alloys viz. Ca70Mg30, Ca70Zn30 and Ca60Al40 have been studied at room temperature in terms of the phonon eigen frequencies of longitudinal and transverse modes, employing
three theoretical formulations given by Hubbard-Beeby (HB), Takeno-Goda (TG) and Bhatia-Singh (BS). Five local field correction
functions viz. Hartree (H), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are used for the first
time in the present investigation to study the screening influence on the aforesaid properties. The pseudo-alloy-atom (PAA)
model is applied for the first time instead of Vegard’s Law. Long wavelength limits of the phonon modes are used to investigate
the elastic and thermal properties of the system. The low temperature specific heat is also calculated from the elastic limit
of the phonon dispersion curves (PDCs). The present findings of the PDCs of Ca70Mg30 glass are found in fair agreement with available theoretical and experimental data. |
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Keywords: | pair potential metallic glasses elasticity phonon dispersion curves (PDCs) thermodynamic properties elastic properties |
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