Chemical thermodynamics of metallic alloy formation. Final report. [Na-K; Mg-Cd; NaCl-NaBr]
Methods and apparatus required in determining the heats of formation at 25/sup 0/C of sodium-potassium alloys, magnesium-cadmium alloys and sodium chloride-sodium bromide ionic solid solutions have been developed. Method for determining free energies of formation of magnesium-cadmium alloys at elevated temperatures has been developed. Apparatus for determining the specific heats of magnesium-cadmium alloys at low temperatures has been prepared. The heat of reaction of pure potassium with water was determined. Provisional values for the heats of formation of four sodium-potassium alloys were obtained. A density-composition curve for magnesium-cadmium alloys was constructed. Heats of formation of nine NaCl-NaBr solid solutions were measured and the data used to calculate thermodynamically the phase diagram describing the mutual solid solubility of the two salts. Lattice spacings of NaCl-NaBr solid solutions were determined by x-ray diffraction techniques and the results compared with Vegnard's Rule and the additivity rule for molar volumes. A theoretical study based upon the Born-Mayer model for ionic solids was made to attempt to account for the variation with composition of the energy and lattice spacings of the alkali halide solid solutions. Comparison of results for the NaCl-NaBr system with those obtained in a similar study of Fontell indicated some discrepancies which were removed by a retreatment of Fontell's data.
- Research Organization:
- Pittsburgh Univ., PA (USA). Dept. of Chemistry
- OSTI ID:
- 6277957
- Report Number(s):
- PB-105013; ON: TI85900408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CADMIUM ALLOYS
THERMODYNAMICS
MAGNESIUM ALLOYS
POTASSIUM ALLOYS
SODIUM ALLOYS
SODIUM BROMIDES
SODIUM CHLORIDES
BINARY MIXTURES
FORMATION FREE ENERGY
FORMATION HEAT
POTASSIUM
REACTION HEAT
SPECIFIC HEAT
WATER
ALKALI METAL COMPOUNDS
ALKALI METALS
ALLOYS
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
DISPERSIONS
ELEMENTS
ENERGY
ENTHALPY
FREE ENERGY
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
METALS
MIXTURES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
360102* - Metals & Alloys- Structure & Phase Studies