M ay 2 00 2 A Mean Field Theory approach to a Dipole-Quadrupole interaction model

Abstract

We study a model initially proposed to describe a mixture of (CO) 1−x (N 2) x adsorbed on exfoliated graphite. The approach used here is that of mean field theory. The Mean Field equations and the Helmholtz Free Energy are found. Phase diagrams are calculated too, and it is possible to find an analytic expression for the second order phase transition line. 

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