Thermodynamics of the cadmium-neptunium system: Solute-solvent interaction in liquid alloys
Abstract
The thermodynamics of the cadmium-rich part of the cadmium-neptunium system have been studied using a high temperature galvanic cell method. The values (cal/mole) of the standard free energy of formation of the two most cadmium-rich intermetallic compounds are given by the equations: NpCd11: ΔGf° (cal/mole) = -42,030 + 38.66T NpCd6: ΔGf° (cal/mole) = -27,510 + 19.72T. The activity coefficient of neptunium relative to solid Np can be represented by the equation: RT ln γNp/xCd 2 = -72,354 + 590.25T - 76.117T ln T + (2,067,115 - 21,105T + 2780.3T ln T) xN p, in which xCd and xNp are the atom fractions of cadmium and neptunium. The Cd-U, Cd-Np, and Cd-Pu systems are discussed in terms of a model which involves the formation of localized bonds between the actinide and cadmium atoms in the solid and the liquid state.
- Publication:
-
Metallurgical Transactions
- Pub Date:
- January 1974
- DOI:
- 10.1007/BF02642928
- Bibcode:
- 1974MT......5...65K