Incollection,

Coexistence curves in Electrical Conductivity of Critical Solution : Isobutyric Acid-Water with Added Ions

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Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)

Abstract

Results of comprehensive temperature $(T)$ studies of electrical conductivity ($\sigma$) in the one-and-two regions of the binary fluid mixture of isobutyric acid-water with X MKCl at various critical concentrations are presented. A strong asymmetry of determined coexistence curves causes a strong violation of the law of rectilinear diameter. The obtained critical anomalies in the homegeneous phase $\sigma_crit (T)$ or the diameter of the $\sigma_d (T)$ are associated with the same critical exponent $= 1-0.88$, where $\alpha$ is the specific heat critical exponent. For the mixture with critical composition, the two regions show a concentration behavior with $\sigma_l - \sigma_u |-t|^\beta$. The phase-transition region shifts as a function of the salt concentration . The effective-critical exponent $\beta^* = ( 0.264-0.296)$ is neither compatible with the Ising value $= 0.325$ nor with the Fisher renormalized value $0.365$.

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