Abstract
Integral equation theory calculations within the mean sphericalapproximation (MSA) and grand canonical Monte Carlo (MC) simulationsare employed to study the phase behaviour of a symmetrical binaryfluid mixture in the presence of a field arising from unequal chemicalpotentials of the two particle species. Attention is focused on thecase for which, in the absence of a field, the phase diagram exhibitsa first-order liquid-liquid transition in addition to the liquid-vaportransition. We find that in the presence of a field, two possiblesubtypes of phase behaviour can occur, these being distinguished bythe relationship between the critical lines in the full phase diagramof temperature, density, and concentration. We present the detailedform of the respective phase diagrams as calculated from MSA andcompare with results from the MC simulations, finding good overallagreement.
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