Non-ideality near the monotectic composition of a miscibility-gap type system: succinonitrile-water

Differential scanning calorimetry (DSC) of near monotectic succinonitrile-water solutions, fast-quenched in hydrophilic and hydrophobic DSC pans, indicate, by degree of undercooling, that there may be significant dependence of final ingot microstructure on the pre-quench equilibration temperature. P...

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Bibliographic Details
Published in:Thermochimica acta 1989-01, Vol.145, p.301-329
Main Authors: Frazier, D.O., Facemire, B.R.
Format: Article
Language:English
Subjects:
Chemical thermodynamics
Chemistry
Exact sciences and technology
General and physical chemistry
Inorganic And Physical Chemistry
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Summary:Differential scanning calorimetry (DSC) of near monotectic succinonitrile-water solutions, fast-quenched in hydrophilic and hydrophobic DSC pans, indicate, by degree of undercooling, that there may be significant dependence of final ingot microstructure on the pre-quench equilibration temperature. Partial molal-volume determinations from density data, along with DSC data, suggest the nature of temperature dependent component associations from 20 °C to 55 °C in homogeneous solutions. The undercooling profile in a hydrophilic container is explained in terms of solution-composition shifts arising from the Gibbs surface excess. The evidence shows that temperature-dependent preferred component aggregates may modulate surface-composition gradients. Similar effects may be present through intermetallic compound formation in metallic monotectic alloys.
ISSN:0040-6031
1872-762X
DOI:10.1016/0040-6031(89)85150-0