Thermodynamic activities of Cd were determined for the
Ce–Cd system in the temperature range between 690 and
1080 K and the composition range between 48 and 85 at%
Cd based on an isopiestic vapor pressure method.
values were converted to a common temperature of 823 K
and are given for the composition range 48–100 at% Cd. Using
a literature value of ln aCe as integration constant, it was
possible to calculate Ce activities and integral Gibbs energies
of formation for the same temperature and composition range.
A minimum of ΔGCd¼ 37 kJ g-atom1 was obtained in the
phase CeCd.
The results of the isopiestic measurements were used to obtain
phase boundaries for the four intermetallic phases CeCd, CeCd2,
Ce13Cd58, and CeCd6. These are compared with phase boundaries
obtained from SEM measurements, and the agreement is found to
be good for CeCd2 and Ce13Cd58, whereas some discrepancies are
found for the other two compounds.