Atomic caging in multicomponent glass-forming metallic liquids

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

Detail(s)

Original languageEnglish
Article number46001
Journal / PublicationEPL
Volume110
Issue number4
Publication statusPublished - 1 May 2015

Abstract

We have examined the effect of density on atomic caging in highly dense glass-forming metallic liquids, Ni59.5Nb40.5 and Ni60Nb34.8Sn5.2 using quasielastic neutron scattering. The density of the liquids is unusually high and close to the mode-coupling dynamic transition. The self-correlation function obtained from the QENS data shows stretching and the temperature dependence of the diffusion coefficient shows non-Arrhenius behavior. The mean relaxation time exhibits a non-linear variation with Q2, which is an indicative of a jump diffusion process in these highly dense liquids. We use a simple jump diffusion model to obtain the residence time of Ni atoms in these alloy liquids. The residence time of Ni atoms exhibits a linear dependence with density of these alloy liquids, but shows an abrupt change in the slope approximately at a density of 7.5 g cm-3. The present observation indicates that the time at which the atoms are trapped in cages is not a monotonic function of density in hard-sphere-like metallic liquids. Our results indicate the existence of a hidden dynamic transition in glass-forming metallic liquids.

Citation Format(s)

Atomic caging in multicomponent glass-forming metallic liquids. / Wong, Kaikin; Chen, Changjiu; Koza, Michael Marek; Samwer, Konrad; Chathoth, Suresh Mavila.

In: EPL, Vol. 110, No. 4, 46001, 01.05.2015.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal