Magnetic Phase-diagram of U-2(ru1-xrhx)(3)si-5

Magnetic measurements performed on U-2(Ru1-xRhx)(3)Si-5 compounds show that: (i) an antiferromagnetic ordering occurs for 0.25 less than or equal to x less than or equal to 0.5 and T-N goes through a maximum at 10 K for x = 0.35; and (ii) in the Rh-rich range 0.5 < x less than or equal to 1.0 the Neel temperature increases linearly with x. These results are compared with those obtained for the U(Ru1-xRhx)(2)Si-2 system.