Thermodynamics of formation of intermediate phases in the yttrium-iron and yttrium-cobalt systems
Technical Report
·
OSTI ID:6158243
Solid electrolyte electromotive force cells have been used to determine the Gibbs free energies, enthalpies and entropies of phase formation for Y/sub 2/Fe/sub 17/, Y/sub 6/Fe/sub 23/, YFe/sub 3/, and YFe/sub 2/ over the temperature range 893 to 1271/sup 0/K. Solid CaF/sub 2/ was employed as the electrolyte. The enthalpies of formation of the Y-Fe phases lie between -6 to -9 kJ/gm-atom. Comparison of the experimental values for the Gibbs energies of formation of the Y-Fe phases at 973 K with those of the Th-Fe, Th-Co, Th-Ni, La-Co and La-Ni systems show an empirical correlation with the total number of bonding electrons in these alloy systems.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6158243
- Report Number(s):
- IS-T-1125; ON: DE85005119
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
COBALT ALLOYS
CORRELATIONS
ELECTRONIC STRUCTURE
ENERGY
ENTHALPY
ENTROPY
FORMATION FREE ENERGY
FORMATION HEAT
FREE ENERGY
INTERMETALLIC COMPOUNDS
IRON ALLOYS
PHYSICAL PROPERTIES
REACTION HEAT
THERMODYNAMIC PROPERTIES
YTTRIUM ALLOYS
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
COBALT ALLOYS
CORRELATIONS
ELECTRONIC STRUCTURE
ENERGY
ENTHALPY
ENTROPY
FORMATION FREE ENERGY
FORMATION HEAT
FREE ENERGY
INTERMETALLIC COMPOUNDS
IRON ALLOYS
PHYSICAL PROPERTIES
REACTION HEAT
THERMODYNAMIC PROPERTIES
YTTRIUM ALLOYS