Observation of distinct atomic caging in Ce80Ni20 metallic melts

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 number35038
Pages (from-to)724-727
Journal / PublicationJournal of Alloys and Compounds
Volume650
Publication statusPublished - 25 Nov 2015

Abstract

We have studied the effect of temperature on atomic caging in Ce80Ni20 alloy liquid using quasi-elastic neutron scattering. The atomic transport mechanism in this liquid is found to be via a jump diffusion process. This is evident from the momentum transfer (Q) dependence of the mean relaxation time. The diffusion coefficients of Ni in Ce80Ni20 melts exhibit Arrhenius temperature dependence while, close to the melting temperature, the residence time of Ni atoms increases exponentially with decreasing temperature. On the other hand, other binary metallic liquids having the Arrhenius temperature dependence of diffusion coefficient exhibit a linear variation of the residence time with temperature. We believe that the exponential increase of the residence time on decreasing the temperature in Ce80Ni20 liquid is due to the large size ratio of Ce/Ni and glass-forming ability of the alloy melt.

Research Area(s)

  • Alloy liquids, Diffusion, Neutron scattering