Abstract
The new compounds R 2Co 2I (R = Y, La, Pr, Nd, Tb–Ho) crystallize in the hexagonal Gd 2Fe 2I structure type (space group: P6 3/ mmc, No. 194). Atomic coordinates have been derived from X-ray powder diffraction and a single crystal determination for Tb 2Co 2I. The data indicate a metric control as stability criterion for the Gd 2Fe 2I vs. La 2Ni 2I structure type. From magnetization measurements, ferromagnetic behavior has been observed for all investigated compounds. A deviation from the de Gennes rule for the light rare earth metal compounds is ascribed to a polarization of the 5d electrons.
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