Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7955952 | Calphad | 2014 | 7 Pages |
Abstract
Cadmium vapor pressures were determined over Ce-Cd samples by an isopiestic method. The measurements were carried out in the temperature range from 690 to 1080Â K and over a composition range of 48-85Â at% Cd. From the vapor pressures thermodynamic activities of Cd were derived for all samples at their respective sample temperatures, and partial molar enthalpies of Cd were obtained from the temperature dependence of the activities. With these partial molar enthalpies the Cd activities were converted to a common temperature of 823Â K. By means of a Gibbs-Duhem integration Ce activities were calculated, using a corresponding literature value for the two-phase field (CeCd11+L) as integration constant. Finally integral Gibbs energies were calculated for the composition range 48-100Â at% Cd with a minimum value of â37Â kJÂ g-atomâ1 at 823Â K in the phase CeCd. Phase boundaries of the intermetallic compounds CeCd, CeCd2, Ce13Cd58, and CeCd11 were estimated from the vapor pressure measurements and from SEM analyses.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Barbara SkoÅyszewska-Kühberger, Thomas L. Reichmann, Rajesh Ganesan, Herbert Ipser,