Temperature dependence of the liquid structure factor of dense monatomic fluids in the long wavelength limit in relation to thermal expansivity

Abstract

The temperature dependence of the liquid structure factor S(k) of dense monatomic fluids, and especially a variety of liquid metals, is studied by combining thermodynamics and fluctuation theory in the long wavelength limit k → 0. Emphasis is placed on the connection of with thermal expansivity. Reference here is then made to recent semiempirical work of Lawson, who advocated an approximate relation, but at the melting temperature T _m , between and the Gruneisen constant.

Keywords:

• structure factor
• monatomic fluids
• thermal expansivity

Acknowledgments

This work was supported by MEC of Spain (Grant MAT2008-06483-C03-01) and Junta de Castilla y Leon (Grant VA158A11-2). The authors acknowledge the hospitality and support of DIPC. N.H.M acknowledges a visiting fellowship from the University of Valladolid.