Document Type
Article
Journal/Book Title/Conference
Surface Science
Volume
554
Location
211-221
Publication Date
2004
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 related to system interaction energies using a unique averaging procedure. The model is applied to four halogenated methane species physisorbed on MgO(100) and NaCl(100) surfaces using previous experimental and theoretical studies to estimate the interaction energy parameters. We find that temperature- and coverage-dependent antiferroelectric to ferroelectric, coverage-dependant ferroelectric up to ferroelectric down, reentrant ferroelectric to ferroelectric, and order-disorder dipole phase transitions can occur. Phase diagrams based on this model are presented.
Recommended Citation
Burns, T. E.; Dennison, JR; and Kite, Jason, "Extended BEG model of halogenated methanes physisorbed on ionic crystals" (2004). Journal Articles. Paper 22.
https://digitalcommons.usu.edu/mp_facpub/22