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• W2063063084 startingPage "7456" @default.
• W2063063084 abstract "Measurements of osmotic compressibility (near the lower consolute point, ${mathrm{T}}_{mathrm{L}}$) in two reentrant liquid mixtures [3-methylpyridine (MP)+water (W)+heavy water (HW) and MP+W+NaCl] are presented. The closest approach to the double critical point (DCP) was marked by a sample of loop size (ensuremath{Delta}T)=250 mK. Analyzing the data by means of the conventional field variable t[=|(${mathrm{T}}_{mathrm{c}}$-T)/${mathrm{T}}_{mathrm{c}}$|] yielded an exact doubling of the critical exponent (CE) ensuremath{gamma} for a ensuremath{Delta}T=250 mK. The approach to double criticality (for intermediate ensuremath{Delta}T) is described by a crossover of the CE from the doubled to its single limit as tensuremath{rightarrow}0. Recourse to a more appropriate field variable, ${mathrm{t}}_{mathrm{UL}}$[=|(${mathrm{T}}_{mathrm{U}}$-T)(${mathrm{T}}_{mathrm{L}}$-T)/${mathrm{T}}_{mathrm{U}}$${mathrm{T}}_{mathrm{L}}$|], restores the Ising value of ensuremath{gamma}(=1.24) for any ensuremath{Delta}T. The salt-doped mixtures permitted us to observe a doubling of the extended scaling exponent (ensuremath{Delta}) and also to scrutinize the ionic critical phenomena. The range of simple scaling in MP+W+HW was found to be extremely large. Switching to a modified variable ${mathrm{t}}_{mathrm{UL}}^{ensuremath{'}}$[=|(${mathrm{T}}_{mathrm{U}}$-T)(${mathrm{T}}_{mathrm{L}}$-T)/${mathrm{T}}^{2}$|] led to a remarkable enhancement in the weight of the extended scaling term in both the mixtures---in apparent disagreement with the earlier findings that reported a widening of the asymptotic region. Non-phase-separating samples of MP+W+HW showed the expected saturating divergence preceded by a region of doubled ensuremath{gamma} as ${mathrm{T}}_{mathrm{D}}$ (DCP temperature) was neared. Most of the facets of our investigations can be comprehended in terms of the geometrical picture of phase transitions as well as the Landau-Ginzburg theory as applied to the reentrant phase transitions." @default.
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• W2063063084 date "1992-12-01" @default.
• W2063063084 modified "2023-09-27" @default.
• W2063063084 title "Double-critical-point phenomena in three-component liquid mixtures: Light-scattering investigations" @default.
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• W2063063084 doi "https://doi.org/10.1103/physreva.46.7456" @default.
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