Using the strength of the Gd-Gd interactions, deduced in different Gd-T intermetallics from the
ordering temperature of GdNi2, the Gd-T exchange coupling parameter (AGdT) of the RmTn (T=Fe or Co;
m/n=1/2;1/3;6/23;1/5 and 2/17) and RmTnAk (A=metalloids and other metals; m/n/k=1/4/1; 2/14/1; 1/11/1
and 1/10/2) systems has been evaluated from analysis of the Curie temperature. Going from T-poor to T-rich
compounds, a tendency to decrease is found for both AGd=Co and AGd=Fe; these variations are compared
with those observed in the exchange parameters ACo=Co and AFe=Fe. ?? 1992.
