Neutron diffraction, AC-susceptibility, and SQUID magnetization study of(Nd
1 - xTbx)Co2Ge2 solid solutions is summarized in the form of a tentative ma
gnetic phase diagram. The magnetic ordering of the (Nd1 - xTbx)Co2Ge2 syste
m is compared to the (Nd1 - xUx)Co2Ge2 system. The U effect on the magnetic
structures is found to be more dominant than that of Tb on Nd. (C) 1999 El
sevier Science B.V. All rights reserved.