Exploration of crossover criticality in an aqueous electrolyte solution

J. Jacob, D. Bagchi, A. Kumar and S.L. Oswal

Physica A: Statistical Mechanics and its Applications, 2003, vol. 318, issue 1, 101-112

Abstract: The light scattering measurements that yield the osmotic susceptibility (χT) in a ternary liquid mixture of 3-methylpyridine+water+sodiumbromide are presented. The measurements have been performed in the one-phase region near the lower consolute points TL's of samples with different concentrations (X) of NaBr. The data analysis has been performed by incorporating both one and two correction-to-scaling terms. Results indicate that for large concentrations of NaBr, two correction-to-scaling terms are necessary for a proper description of the data. Moreover, it is observed that the amplitude of the first correction-to-scaling term (χ1) is negative for all the cases studied. These results are interpreted as a nonmonotonic crossover of the effective susceptibility exponent, γeff, from its Ising value of 1.24 to the mean-field value of 1.00, when moving away from a given TL. Investigations on the existence of an additional length scale in this mixture, using excess molar volume measurements, are also reported.

Keywords: Equilibrium critical phenomena; Critical exponents; Multicritical point (search for similar items in EconPapers)
Date: 2003
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:318:y:2003:i:1:p:101-112

DOI: 10.1016/S0378-4371(02)01412-7

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