The crystallographic and magnetic properties of YBa2Cu3-xRhxOy and YBa2CU3-
xIrxOy (x = 1,2,3) have been studied. The structures are orthorhombic, tetr
agonal and cubic with a mixture of them. YBa2Ir3Oy is a weak ferromagnet wi
th T-C = 185 K. YBa2Cu2RhOy and YBa2CU2IrOy are antiferromagnetic with T-N
= 14 K. The other compounds are paramagnetic. (C) 2001 Elsevier Science B.V
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