INVESTIGADORES
RAMIREZ PASTOR antonio Jose
artículos
Título:
Differential heat of adsorption in 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:
Año: 2000 vol. 283 p. 94 - 99
ISSN:
0378-4371
Resumen:
We studied the coverage dependence of the dierential heat of adsorption in the presence
of an order{disorder phase transition, by employing theoretical mean- eld 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 adatoms, Monte Carlo reveals
the existence of singularities in the dierential heat at critical coverages, which are not observed
through the theoretical approaches. The dierential heat of adsorption appears as a sensitive
quantity to the phase transition, allowing a very accurate determination of the phase diagram.
