Dielectric behavior of organic monolayers due to orientational phase transition.

Abstract

Conventionally, there is only one treatment, i.e., the relaxation-time treatment, for thermally stimulated problems. An alternative thermodynamics approach is examined for its feasibility in calculating the thermally stimulated order parameter, dielectric constant, and current (TSC) of monolayers on a material surface. It was found that the two different phases are attributed to the effect of two different kinds of molecular interactions. The theoretical results also demonstrate the phase-transition feature of the experimental TSC and dielectric constant ${\mathrm{\ensuremath{\epsilon}}}_{\mathit{S}}$ at a critical temperature ${\mathit{T}}_{\mathit{C}}$. \textcopyright{} 1996 The American Physical Society.