Extended BEG Model of Halogenated Methanes physisorbed on ionic crystals

Authors

Teresa Burns
Jason Kite
John R. Dennison, Utah State UniversityFollow

Document Type

Conference Paper

Journal/Book Title/Conference

Bulletin of the American Physical Society

Volume

46

Publication Date

2001

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 BEG approximation, 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 halogenated methanes physisorbed on MgO(100) and NaCl(100) using previous experimental and theoretical studies to determine the interaction energies. We find temperature-dependent antiferroeletric to ferroelectric dipole phase transitions and order-disorder phase transitions can occur. Phase diagrams are presented.

Comments

Bull. Am. Phys. Soc. 46(1) Part II, 848, (2001). American Physical Society March Meeting 2001, March 12 - 16, 2001, Seattle, Washington.

Recommended Citation

Teresa Burns, Jason Kite and JR Dennison, “Extended BEG Model of Halogenated Methanes physisorbed on ionic crystals,” Bull. Am. Phys. Soc. 46(1) Part II, 848, (2001). American Physical Society March Meeting 2001, March 12 - 16, 2001, Seattle, Washington.