ifferent temperature gradients, applied by two-zone furnaces, for
periods of about 3 to 5 weeks. The temperatures of the samples (TS)
and the reservoir (TR) were measured periodically by raising a Pt/
Pt10%Rh thermocouple inside the thermocouple well. After equilibration,
the isopiestic apparatus was quenched in cold water and
cut open by a diamond saw. The individual samples (which had
become Ce–Cd alloys during the equilibration) were weighed again
and their compositions were derived from the mass difference
which was attributed to the uptake of Cd.