E. Machado

KINETICS OF A MIXED ISING FERRIMAGNETIC SYSTEM

We present a study, within a mean-field approach, of the kinetics of a classical mixed Ising ferrimagnetic model on a square lattice, in which the two interpenetrating square sublattices have spins

Decay of metastable phases in a model for the catalytic oxidation of CO.

\ensuremath{\sigma}=\ifmmode\pm\else\textpm\fi{}1/2

Response of a catalytic reaction to periodic variation of the CO pressure: increased CO2 production and dynamic phase transition.

and

Magnetic behavior of a mixed Ising ferrimagnetic model in an oscillating magnetic field

S=\ifmmode\pm\else\textpm\fi{}1,0.

Effect of CO desorption and coadsorption with O on the phase diagram of a Ziff–Gulari–Barshad model for the catalytic oxidation of CO

The kinetics is described by a Glauber-type stochastic dynamics in the presence of a time-dependent oscillating external field and a crystal field interaction. We can identify two types of solutions: a symmetric one, where the total magnetization

Compensation Temperature of a Mixed Ising Ferrimagnetic Model in the Presence of External Magnetic Fields

M

Response of a model of CO oxidation with CO desorption and diffusion to a periodic external CO pressure

oscillates around zero, and an antisymmetric one where

Metastability and compensation temperatures for a mixed Ising ferrimagnetic system

M

Mixed Ising models with two compensation temperatures

oscillates around a finite value different from zero. There are regions of the phase space where both solutions coexist. The dynamical transition from one regime to the other can be of first or second order depending on the region in the phase diagram. Depending on the value of the crystal field we found up to two dynamical tricritical points where the transition changes from continuous to discontinuous. Also, we perform a similar study on the Blume-Capel

Decay of metastable nonequilibrium phases, enhanced reaction rate, and dynamic phase transition in a model of CO oxidation with CO desorption

(S=\ifmmode\pm\else\textpm\fi{}1,0)