All Physics Faculty Publications

Document Type

Article

Journal/Book Title/Conference

Surface Science

Volume

554

Issue

2014-02-03

Publisher

Elsevier

Publication Date

4-1-2004

First Page

211

Last Page

221

DOI

10.1016/j.susc.2004.02.010

Abstract

The 2D dielectric phases and phase transitions of adsorbed dipolar molecules are modeled using a dilute spin-one Ising model. This model is studied in the Blume–Emery–Griffiths formalism, using a mean-field approximation, where the interaction parameters are uniquely determined from the system interaction energies using an averaging procedure. The model is applied to four monhalogenated methane species physisorbed on MgO(1 0 0) and NaCl(1 0 0) surfaces using previous experimental and theoretical studies to estimate the interaction energy parameters. We find that temperature- and coverage-dependent antiferroelectric to ferroelectric, coverage-dependent ferroelectric up to ferroelectric down, reentrant ferroelectric to ferrielectric, and order-disorder dipole phase transitions can occur. Phase diagrams based on this model are presented.

Comments

http://www.sciencedirect.com/science/article/pii/S0039602804001153

Published by Elsevier in Surface Science. Authors' PDF is available for.

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