Abstract
The R 2Co 3Si 5 (R=Tb,Dy) compounds crystallize in a monoclinic Lu 2Co 3Si 5-type of crystal structure while Tb 2Ir 3Si 5 in an orthorhombic U 2Co 3Si 5-type. The Tb 2Co 3Si 5 has a sine modulated structure described by the propagation vector k =(0,0.0817(6),0) in the temperature range 1.6 K– T N =22.6 K while the Dy 2Co 3Si 5 shows a collinear antiferromagnetic structure between 1.6 K and T N =21.9 K. For R=Tb the magnetic moment is parallel to the c-axis while for R=Dy it forms an angle 25.8° with the c-axis. The Tb 2Ir 3Si 5 has in the temperature range 1.5 K– T N =11 K, a sine modulated magnetic ordering with the propagation vector k =(0,0,0.1328(2)). The Tb magnetic moment is parallel to the b-axis.
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