**Author**: J. Lebowitz and G.
Gallavotti

**Title**: *
Phase transitions in binary lattice gases
*

**Abstract:**
We prove the existence of phase transitions in several kinds of two
component lattice gases: Some of these are isomorphic to spin systems
and/or to fluids composed of asymmetrical molecules which can have
different orientations. Among the models studied is one with infinite
repurlsion between particles of different species (hard vores),
extending over arbitrarily many neighboring latice sites. Some of
these systems have been investigated previously in the mean field
approximation and numerically.

**Key words: **Equilibrium
Statistical Mechanics, Phase transitions, Gibbs States,
Widom-Rowlinson model, Binary gases

Giovanni Gallavotti

Fisica, Universita' di Roma 1

P.le Moro 2

00185 Roma, Italia

tel +39-06-4991-4370

fax +39-06-4957697

em giovanni.gallavotti@roma1.infn.it

http://ipparco.roma1.infn.it