Abstract
The alloys RNi₂Mn and RCo₂Mn with R representing the rare earth element are isostructural analogues of the binary Laves phases RNi₂, RCo₂. We have synthesized the isoelectronic Pd-based RPd₂Mn analogues with R = Gd, Tb, and Dy, for the first time. They crystallize in a cubic structure, however, not in the cubic C15 ( Fd-3m ) structure of RNi₂Mn, nor the Laves phase’ structure. Instead, the crystal lattice is described by the ( Im-3m space group with Tb/Dy, Pd, and Mn atoms randomly distributed over the 2a Wyckoff position of the W-type structure (A2, disordered bcc). The magnetization data reveal a standard paramagnetic behavior, with effective magnetic moments strikingly close to those expected for Tb³⁺ and Dy³⁺ free ions, down to 130 K.

Key words
RETM₂Mn, RE_1-zPd_2+x+yMn_1-x alloys, solid solutions, intermetallics, crystal structure, magnetization

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