INVESTIGADORES
BULNES fernando manuel
artículos
Título:
Differential heat of adsorption in the presence of an order-disorder phase transition
Autor/es:
A. J. RAMIREZ-PASTOR; F. BULNES
Revista:
PHYSICA A - STATISTICAL AND THEORETICAL PHYSICS
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2000 vol. 283 p. 198 - 203
ISSN:
0378-4371
Resumen:
We studied the coverage dependence of the differential heat of adsorption in the presence of an order-disorder phase transition, by employing theoretical mean-field and quasi-chemical approaches and Monte Carlo simulation, in the framework of the lattice-gas model. For a square lattice, with repulsive interactions between the nearest-neighbor ad-atoms, Monte Carlo reveals the existence of singularities in the differential heat at critical coverage, which are not observed through the theoretical approaches. The differential heat of adsorption appears as a sensitive quantity to the phase transition, allowing a very accurate determination of the phase diagram.
