We prepared single crystals in UCo1-xRhxGe and UIr1-xRhxGe systems to establish a complex d(U-U)-T (d(U-U) is the shortest interatomic uranium distance and T is temperature) magnetic phase diagram. This recognized a characteristic maximum in magnetic susceptibility at temperature T-max along the b axis as an important parameter.
Three magnetically ordered regions can be distinguished within this scope; first a ferromagnetic region with Curie temperature < T-max, second a ferromagnetic region with Curie temperature approximate to T-max and finally an antiferromagnetic region existing on the UIrGe side with Neel temperature < T-max.