Structural properties of
undercooled liquid sodium
and caesium
O AKINLADE, B R IJADUOLA*, U E
VINCENT and G A ADEBAYO
Abdus Salam International Centre for Theoretical
Physics, Via Beirut 31, I-34100, Trieste, Italy
Department of Physics, University of Agriculture, Abeokuta, Nigeria
*Email: ijaduola@ictp.trieste.it
Abstract:
Extensive theoretical results for the temperature dependence of
the static and dynamical structure of undercooled alkali metals using Na and Cs as
examples are presented. The static structural properties are obtained from the HMSA
integral equations using pair potentials derived from an accurate non-local
pseudopotential. The dynamical properties obtained from viscoelastic theory are compared
with experiments and the results of memory function formalism. The study indicates that
collective density excitations are more dominant in the undercooled region than at their
melting points, and that the dynamical properties of Na and Cs exhibit subtle differences
in their gross features.
keywords : Undercooled alkali metals; sodium; caesium;
temperature dependence; structural properties; dynamical properties.
pacs : 61.20; 63.90
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