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Non-ideality near the monotectic composition of a miscibility-gap type system - Succinonitrile-waterDifferential scanning calorimetry (DSC) of near monotectic succinonitrile-water solutions, fast-quenched in hydrophilic and hydrophobic DSC pans, indicate, by degree of undercooling, thst 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 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.
Document ID
19900029217
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Frazier, D. O.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Facemire, B. R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Thermochimica Acta
Volume: 145
ISSN: 0040-6031
Subject Category
Inorganic And Physical Chemistry
Accession Number
90A16272
Distribution Limits
Public
Copyright
Other

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