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Critical points and tricritical points in liquid sulfur solutions

The Journal of Chemical Physics, ISSN: 0021-9606, Vol: 74, Issue: 11, Page: 6415-6430
1981
  • 63
    Citations
  • 0
    Usage
  • 5
    Captures
  • 0
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Metrics Details

  • Citations
    63
    • Citation Indexes
      63
  • Captures
    5

Article Description

Equilibrium polymerization in a solvent can be described by the n→0 limit of a dilute n-vector model of magnetism in a small magnetic field. In the molecular field approximation the model becomes identical to the earlier theory of Scott for liquid sulfur solutions. The lower critical solution temperature in sulfur solutions is found to be intimately associated with a tricritical point in the magnetic model which accounts for the distinctive shape found by Scott for the high-temperature phase separation curve. The connection with the magnetic model also establishes a relationship between the phase diagrams predicted by Scott for sulfur solutions and those predicted by Blume, Emery, and Griffiths for He-He mixtures. Modern theory of critical and tricritical phenomena suggests that incorporation of nonclassical critical behavior in the dilute n→0 vector model may help to resolve certain discrepancies between Scott's mean field theory and experimental coexistence curves for sulfur solutions. © 1981 American Institute of Physics.

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