Free Energies in the Landau and Molecular Field Approaches
作者:
J. Katriel,
G.F. Kventsel,
G.R. Luckhurst,
T.J. Sluckin,
期刊:
Liquid Crystals
(Taylor Available online 1986)
卷期:
Volume 1,
issue 4
页码: 337-355
ISSN:0267-8292
年代: 1986
DOI:10.1080/02678298608086667
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
An expression for the entropy as a power series in the order parameter is derived in the context of molecular field theory. The expression is valid both at and away from equilibrium. It is a unique generalization of molecular field theory to non-equilibrium situations. Discrepancies with certain expressions which have appeared in the literature are resolved. Analysis of the radius of convergence of the power series indicates that in certain cases, including the Maier-Saupe model of liquid crystals, molecular field theory and Landau theory cannot be made to agree over the entire range of possible values of the order parameter.
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