Nonergodic correction to a binary mixture phase diagram

For a binary mixture with limited miscibility of the components, the correction to the equation of state that arises from the finite diffusion velocity is discussed. It is shown that this correction corresponds to a nonergodic microheterogeneity of the mixture. We suggest that the above microheterog...

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Bibliographic Details
Published inPhysica A Vol. 449; pp. 395 - 400
Main Author Son, L.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2016
Subjects
Binary mixtures
Binary phase diagram
Diffusion
Fluctuation
Mathematical analysis
Mean square values
Microheterogeneity
Miscibility
Nonergodicity
Phase diagrams
Statistical mechanics
Nonergodicity
Binary phase diagram
Microheterogeneity
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Summary:For a binary mixture with limited miscibility of the components, the correction to the equation of state that arises from the finite diffusion velocity is discussed. It is shown that this correction corresponds to a nonergodic microheterogeneity of the mixture. We suggest that the above microheterogeneity may be accounted as corresponding fluctuations of the chemical potential. The mean square of these fluctuations C is an additional thermodynamic variable, and the nonergodic microheterogeneity is an equilibrium property of every binary mixture with limited miscibility. The experimental status of this statement is discussed for eutectic and monotectic systems. •Nonergodic correction results in a bifurcation of phase separation line.•Two critical and one triple points appear due to this bifurcation.•Microheterogeneous state may exist as a separate nonergodic phase.•This situation is typical for the eutectic binary systems.
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content type line 23
ISSN:0378-4371
1873-2119
DOI:10.1016/j.physa.2015.12.112