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Article Dans Une Revue Journal of Chemical Physics Année : 2012

Signatures of fragile-to-strong transition in a binary metallic glass-forming liquid.

Résumé

Classical molecular dynamics investigations of the evolution of the microscopic structure and atomic dynamics are found to provide signatures of fragile-to-strong transition in a Cu-Zr bulk metallic glass forming alloy. Present study reveals that (i) the alloy exhibits a non-monotonic decoupling of the self-diffusion coefficient D and the relaxation time tau as observed in case of supercooled water despite the difference in the intermolecular interactions compared to this system, (ii) the temperature dependence of D and tau suggests a crossover from non-Arrhenius to Arrhenius behavior near mod-ecoupling transition temperature T-C, and (iii) the alloy exhibits a crossover from Stokes-Einstein ((D similar to (tau/T)(-1)) to fractional Stokes-Einstein (D alpha (tau/T)(-zeta)) with exponent zeta approximate to 0.6. A weak first-order transition, associated with the fragile-to-strong transition, has also been observed in the undercooled region. These findings are in accordance with the growing idea of fragile-to-strong crossover having larger generality than the traditional classification of the glass-forming liquids as fragile and strong.

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Matériaux
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Dates et versions

hal-00728111 , version 1 (04-09-2012)

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K. N. Lad, N. Jakse, A. Pasturel. Signatures of fragile-to-strong transition in a binary metallic glass-forming liquid.. Journal of Chemical Physics, 2012, 136 (10), pp.1. ⟨10.1063/1.3692610⟩. ⟨hal-00728111⟩
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