Abstract
Contrary to the statement in a recent publication by A.I.M. Rae (1982), the present authors demonstrate that both the quasi-harmonic lattice approximation and orientation strain order parameter approach to the phase transition in sym-triazine give identical results. Both treatments rely on a Landau mean field expansion of the free energy in the vicinity of the phase transition. The usefulness of one theoretical treatment over the other is a function of the details of the experimental findings and just which properties are chosen to be modelled.
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