Fractional Exponent of the Modified Stokes-Einstein Relation in the Metallic Glass-Forming Melt Pd₄₃Cu₂₇Ni₁₀P₂₀

Abstract:

The diffusion coefficient in the metallic glass-forming systems such as Pd-Cu-Ni-P exhibits a marked deviation from the Stokes-Einstein (SE) relation in the proximity of the glass transition temperature. Such a deviation is characterized by the fractional exponent p of the modified SE expression. For the material Pd43Cu27Ni10P20, it has been reported that it takes the value p = 0.75. In this work, it is shown that the value of p is highly correlated with the ratio ED / ENB, where ED and ENB are the activation energies for diffusion coefficient D and cooperativity NB defined by the Bond Strength-Coordination Number Fluctuation (BSCNF) model. The present paper reports that for the metallic glass-forming melt Pd43Cu27Ni10P20, the fractional exponent p can be calculated accurately within the framework of the BSCNF model.

• Periodical: Advanced Materials Research (Volumes 146-147)
• Pages: 1463-1468
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.146-147.1463
• Online since: October 2010
• Authors: Masahiro Ikeda, Masaru Aniya
• Keywords: Bond Strength-Coordination Number Fluctuation Model, Cooperativity, Diffusion Coefficient, Fractional Stokes-Einstein Relation, Viscosity

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